<SEC-DOCUMENT>0001047469-20-004682.txt : 20200821
<SEC-HEADER>0001047469-20-004682.hdr.sgml : 20200821
<ACCEPTANCE-DATETIME>20200821161128
ACCESSION NUMBER:		0001047469-20-004682
CONFORMED SUBMISSION TYPE:	424B7
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20200821
DATE AS OF CHANGE:		20200821

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PLUG POWER INC
		CENTRAL INDEX KEY:			0001093691
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRICAL INDUSTRIAL APPARATUS [3620]
		IRS NUMBER:				223672377
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B7
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-235328
		FILM NUMBER:		201123524

	BUSINESS ADDRESS:	
		STREET 1:		968 ALBANY-SHAKER ROAD
		CITY:			LATHAM
		STATE:			NY
		ZIP:			12110
		BUSINESS PHONE:		5187827700

	MAIL ADDRESS:	
		STREET 1:		968 ALBANY-SHAKER ROAD
		CITY:			LATHAM
		STATE:			NY
		ZIP:			12110
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B7
<SEQUENCE>1
<FILENAME>a2242301z424b7.htm
<DESCRIPTION>424B7
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Use these links to rapidly review the document<BR>
<A HREF="#bg48101_table_of_contents">  TABLE OF CONTENTS</A> <BR>
<A HREF="#bg48102_table_of_contents">  TABLE OF CONTENTS</A><BR></font>
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</FONT> <FONT SIZE=2><A HREF="#bg48101a_main_toc">Table of Contents</A> </FONT></P>

<P ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><B>Filed pursuant to Rule&nbsp;424(b)(7)<BR>
Registration No.&nbsp;333-235328  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> CALCULATION OF REGISTRATION FEE  </B></FONT></P>
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<TD VALIGN="BOTTOM" style="font-family:times;"><p style="font-family:times;margin-left:4pt;text-indent:-4pt;"><FONT SIZE=2> </FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
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<TD COLSPAN=9 VALIGN="BOTTOM" style="font-family:times;border-bottom:double #000000 2.25pt;">&nbsp;</TD>
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<TH ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Title of Each Class of Securities<BR>
to be Registered(1)</B></FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Amount<BR>
Registered(2)</B></FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Proposed<BR>
Maximum<BR>
Offering Price<BR>
Per Share</B></FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Proposed<BR>
Maximum<BR>
Aggregate<BR>
Offering Price</B></FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Amount of<BR>
Registration<BR>
Fee</B></FONT><BR></TH>
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<TD style="font-family:times;"><p style="font-family:times;margin-left:4pt;text-indent:-4pt;"><FONT SIZE=1><B> </B></FONT><FONT SIZE=2>Common stock, par value $0.01 per share</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>3,458,254</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>$11.89(3)(4)</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>$41,118,640(4)</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>$5,337.20(4)</FONT></TD>
</TR>
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<TD COLSPAN=9 VALIGN="BOTTOM" style="font-family:times;border-bottom:double #000000 2.25pt;"><p style="font-family:times;margin-left:4pt;text-indent:-4pt;"> &nbsp;</TD>
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<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(1)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>This
prospectus supplement relates to the resale or other distribution by the selling stockholders referenced herein of up to 3,458,254 shares of the registrant's
common stock.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(2)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>This
prospectus supplement also relates to such additional shares of common stock as may be issued in connection with a stock split, stock dividend or similar
transaction, pursuant to Rule&nbsp;416 of the Securities Act of 1933, as amended, or the Securities Act.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(3)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Estimated
solely for the purposes of computing the registration fee with respect to 3,458,254 shares of common stock pursuant to Rule&nbsp;457(c) under the
Securities Act, based on the average of the high and low prices of the registrant's common stock on the Nasdaq Capital Market on August&nbsp;17, 2020.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(4)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Calculated
in accordance with Rule&nbsp;457(r) under the Securities Act. This "Calculation of Registration Fee" table shall be deemed to update the "Calculation of
Registration Fee" table in the registrant's registration statement on Form&nbsp;S-3 filed with the Securities and Exchange Commission on December&nbsp;2, 2019 (File No.&nbsp;333-235328) in
accordance with Rules&nbsp;456(b) and 457(r) under the Securities Act. </FONT></DD></DL>
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</FONT> <FONT SIZE=2><A HREF="#bg48101a_main_toc">Table of Contents</A> </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><B>Prospectus Supplement<BR>
(To Prospectus dated December&nbsp;2, 2019)</B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=5><B>PLUG POWER&nbsp;INC.  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=5><B>
<IMG SRC="g589866.jpg" ALT="LOGO" WIDTH="255" HEIGHT="91">
  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=4><B>3,458,254 Shares of Common Stock  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=4><B> Offered by Selling Stockholders  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The selling stockholders referred to in this prospectus supplement may offer and resell up to 3,458,254 shares of our common stock under this
prospectus supplement. The selling stockholders acquired these shares from us pursuant to an Agreement and Plan of Merger, dated as of June&nbsp;22, 2020, by and among Plug Power&nbsp;Inc., Giner
ELX,&nbsp;Inc., Giner ELX Sub,&nbsp;LLC, Giner ELX Merger Sub,&nbsp;Inc. and Giner,&nbsp;Inc., as the representative of the stockholders of Giner ELX,&nbsp;Inc., which we refer to in this
prospectus supplement as the Merger Agreement. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
registration of the shares of common stock covered by this prospectus supplement does not mean that the selling stockholders will offer or sell all or any of the shares. Common stock
offered hereby by the selling stockholders, or their pledgees, donees, assignees, transferees or other successors-in-interest, may be sold from time to time directly or indirectly through one or more
underwriters, broker-dealers or agents, and in one or more public or private transactions. The shares of common stock may be sold in one or more transactions at fixed prices, at prevailing market
prices at the time of the sale, at varying prices determined at the time of sale or at negotiated prices. These sales may be effected in transactions, which may involve crosses or block transactions.
If the shares of common stock are sold through underwriters, broker-dealers or agents, the selling stockholders will be responsible for underwriting discounts or commissions or agent's commissions.
The timing and amount of any sale is within the sole discretion of the selling stockholders, subject to certain restrictions. See the section entitled "Plan of Distribution" for more information. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will not receive any proceeds from any sale of common stock by the selling stockholders. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
common stock is listed on the NASDAQ Capital Market under the symbol "PLUG." On August&nbsp;20, 2020, the last reported sale price of our common stock on the NASDAQ Capital Market
was $13.67. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=3><B>Investing in our securities involves a high degree of risk. You should review carefully the risks and uncertainties referenced under the heading
"Risk Factors" on page&nbsp;S-6 of this prospectus supplement and in the other documents that are incorporated by reference in this prospectus supplement and the accompanying
prospectus.</B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT SIZE=2><B>Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these
securities or determined if this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense.</B></FONT></P>
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&nbsp;&nbsp;&nbsp;
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 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>The
date of this prospectus supplement is August&nbsp;21, 2020. </FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg48101a_main_toc">Table of Contents</A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="bg48101_table_of_contents"> </A>
<BR></FONT><FONT SIZE=2><B>  TABLE OF CONTENTS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A NAME="BG48101A_main_toc"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> Prospectus Supplement  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>
<A NAME="BG48101_TOC2"></A> </FONT></P>
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<TD VALIGN="TOP" style="font-family:times;"><A HREF="#bi48101_about_this_prospectus_supplement"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>ABOUT THIS PROSPECTUS SUPPLEMENT</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#bi48101_about_this_prospectus_supplement"><FONT SIZE=2>S-1</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#ca48101_prospectus_supplement_summary"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>PROSPECTUS SUPPLEMENT SUMMARY</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#ca48101_prospectus_supplement_summary"><FONT SIZE=2><BR>
S-3</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dc48101_risk_factors"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>RISK FACTORS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dc48101_risk_factors"><FONT SIZE=2><BR>
S-6</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dc48101_cautionary_statement_r__dc402371"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING
STATEMENTS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dc48101_cautionary_statement_r__dc402371"><FONT SIZE=2><BR>
S-7</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dc48101_use_of_proceeds"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>USE OF PROCEEDS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dc48101_use_of_proceeds"><FONT SIZE=2><BR>
S-9</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#de48101_selling_stockholders"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>SELLING STOCKHOLDERS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#de48101_selling_stockholders"><FONT SIZE=2><BR>
S-10</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dg48101_plan_of_distribution"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>PLAN OF DISTRIBUTION</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dg48101_plan_of_distribution"><FONT SIZE=2><BR>
S-12</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#di48101_legal_matters"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>LEGAL MATTERS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#di48101_legal_matters"><FONT SIZE=2><BR>
S-14</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#di48101_experts"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>EXPERTS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#di48101_experts"><FONT SIZE=2><BR>
S-14</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#di48101_where_you_can_find_additional_information"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>WHERE YOU CAN FIND ADDITIONAL INFORMATION</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#di48101_where_you_can_find_additional_information"><FONT SIZE=2><BR>
S-14</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#di48101_incorporation_of_certain_information_by_reference"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>INCORPORATION OF CERTAIN INFORMATION BY
REFERENCE</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#di48101_incorporation_of_certain_information_by_reference"><FONT SIZE=2><BR>
S-14</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
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 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> Prospectus  </B></FONT></P>


<P style="font-family:times;"><FONT SIZE=2>
<A NAME="BG48101_TOC"></A> </FONT></P>
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<TD style="font-family:times;"><A HREF="#h1"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>ABOUT THIS PROSPECTUS</FONT></A></TD>
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<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h1"><FONT SIZE=2>1</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h2"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>OUR COMPANY</FONT></A></TD>
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2</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h3"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>RISK FACTORS</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h4"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h5"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>USE OF PROCEEDS</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h6"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>DESCRIPTION OF COMMON STOCK AND PREFERRED STOCK</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h7"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>DESCRIPTION OF WARRANTS</FONT></A></TD>
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13</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h8"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>DESCRIPTION OF DEBT SECURITIES</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h9"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>DESCRIPTION OF UNITS</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h10"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>SELLING SECURITYHOLDERS</FONT></A></TD>
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26</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h11"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>PLAN OF DISTRIBUTION</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h12"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>LEGAL MATTERS</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h13"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>EXPERTS</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h14"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>WHERE YOU CAN FIND ADDITIONAL INFORMATION</FONT></A></TD>
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28</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h15"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>INCORPORATION OF CERTAIN INFORMATION BY REFERENCE</FONT></A></TD>
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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="bi48101_about_this_prospectus_supplement"> </A>
<A NAME="toc_bi48101_1"> </A>
<BR></FONT><FONT SIZE=2><B>  ABOUT THIS PROSPECTUS SUPPLEMENT    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This document is in two parts. The first part is this prospectus supplement, which describes the specific terms of the offering of our common
stock by the selling stockholders and also adds to and updates information contained in the accompanying prospectus. The second part is the accompanying prospectus, which gives more general
information, some of which may not apply to this offering. The rules of the Securities and Exchange Commission, or the SEC, allow us to incorporate by reference information into this prospectus
supplement. This prospectus supplement may add to, update or change the information in the accompanying prospectus. To the extent there is a conflict between the information contained in this
prospectus supplement, on the one hand, and the information contained in the accompanying prospectus or in any document incorporated by reference that was filed with the SEC before the date of this
prospectus supplement, on the other hand, you should rely on the information in this prospectus supplement. If any statement in one of these documents is inconsistent with a statement in another
document having a later date, for example, a document incorporated by reference in the accompanying prospectus, the statement in the document having the later date modifies or supersedes the earlier
statement. See "Incorporation of Certain Information by Reference." You should read both this prospectus supplement and the accompanying prospectus together with
additional information described under the heading "Where You Can Find Additional Information" before investing in our common stock. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You
should rely only on the information contained or incorporated by reference in this prospectus supplement, the accompanying prospectus and any related free writing prospectus. Neither
we nor the selling stockholders have authorized anyone to provide you with different information in addition to or different from that contained in this prospectus supplement, the accompanying
prospectus and any related free writing prospectus. No dealer, salesperson or other person is authorized to give any information or to represent anything not contained in this prospectus supplement,
the accompanying prospectus or any related free writing prospectus that we may authorize to be provided to you. You must not rely on any unauthorized information or representation. This prospectus
supplement is an offer to sell only the securities offered hereby, but only under circumstances and in jurisdictions where it is lawful to do so. You should assume that the information in this
prospectus supplement and the accompanying prospectus is accurate only as of the date on its respective cover, that the information appearing in any related free writing prospectus is accurate only as
of the date of that free writing prospectus, and that any information incorporated by reference is accurate only as of the date of the document incorporated by reference, regardless of the time of
delivery of this prospectus supplement, the accompanying prospectus or any related free writing prospectus, or any sale of a security. Our business, financial condition, results of operations and
prospects may have changed since those dates. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
industry and market data contained or incorporated by reference in this prospectus supplement are based either on our management's own estimates or on independent industry
publications, reports by market research firms or other published independent sources. Although we believe these sources are reliable, we have not independently verified the information and cannot
guarantee its accuracy and completeness, as industry and market data are subject to change and cannot always be verified with complete certainty due to limits on the availability and reliability of
raw data, the voluntary nature of the data gathering process and other limitations and uncertainties inherent in any statistical survey of market shares. Accordingly, you should be aware that the
industry and market data contained or incorporated by reference in this prospectus supplement, and estimates and beliefs based on such data, may not be reliable. Unless otherwise indicated, all
information contained or incorporated by reference in this prospectus supplement concerning our industry in general or any segment thereof, including information regarding our general expectations and
market opportunity, is based on management's estimates using internal data, data from industry related publications, consumer research and marketing studies and other externally obtained data. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>S-1</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
prospectus supplement and the information incorporated herein by reference includes trademarks, service marks and trade names owned by us or other companies. All trademarks, service
marks and trade names included or incorporated by reference into this prospectus, any applicable prospectus supplement or any related free writing prospectus are the property of their respective
owners. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless
otherwise mentioned or unless the context requires otherwise, the words "Plug Power," "we," "us," "our," "the Company" or similar references refer to Plug Power&nbsp;Inc. and
its subsidiaries; and the term "securities" refers to the shares of our common stock offered by this prospectus supplement and the accompanying prospectus. All trademarks, service marks and trade
names included or incorporated by reference into this prospectus supplement and the accompanying prospectus are the property of their respective owners. </FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><I> </i></font></p>
<DIV style="width:100%;box-sizing:border-box;border:#000000 solid 1.0pt;padding-top:12.0pt;padding-right:12.0pt;padding-bottom:12.0pt;padding-left:12.0pt;">
 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="ca48101_prospectus_supplement_summary"> </A>
<A NAME="toc_ca48101_1"> </A>
<BR></FONT><FONT SIZE=2><B>  PROSPECTUS SUPPLEMENT SUMMARY    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT SIZE=2><I>This summary highlights certain information about us, this offering and selected information contained elsewhere in or
incorporated by reference into this prospectus supplement. This summary is not complete and does not contain all of the information that you should consider before deciding whether to invest in our
common stock. For a more complete understanding of our company and this offering, you should read and consider carefully the more detailed information included or incorporated by reference in this
prospectus supplement and the accompanying prospectus, including the factors described under the heading "Risk Factors" of this prospectus supplement, in our
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020002267/plug-20191231x10k.htm">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31,
2019</A>, <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020005975/plug-20200331x10q.htm">Quarterly Report on Form&nbsp;10-Q for the quarter ended
March&nbsp;31, 2020</A>, <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020010213/plug-20200630x10q.htm">Quarterly Report on Form&nbsp;10-Q for the quarter
ended June&nbsp;30, 2020</A> and our other filings that are incorporated by reference into this prospectus supplement and the accompanying prospectus.</I></FONT></P>

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Overview  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As a leading provider of comprehensive hydrogen fuel cell turnkey solutions, we are seeking to build a green hydrogen economy. We are focused on
hydrogen and fuel cell systems that are used to power electric motors primarily in the electric mobility and stationary power markets, given the ongoing paradigm shift in the power, energy, and
transportation industries to address climate change, energy security, and meet sustainability goals. Plug Power created the first commercially viable market for hydrogen fuel cell, or the HFC
technology. As a result, we have deployed over 34,000 fuel cell systems, and have become the largest buyer of liquid hydrogen, having built and operated a hydrogen network across North America. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Products and Services  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We are focused on proton exchange membrane, or PEM, fuel cell and fuel processing technologies, fuel cell/battery hybrid technologies, and
associated hydrogen storage and dispensing infrastructure from which multiple products are available. A fuel cell is an electrochemical device that combines hydrogen and oxygen to produce electricity
and heat without combustion. Hydrogen is derived from multiple sources. The majority of liquid hydrogen in the United States is produced using the steam methane reforming process and utilizing
by-product hydrogen from chlor
alkali production. By-product hydrogen from a chlor alkali plant is considered to be low carbon hydrogen and in some cases, considered green hydrogen, depending on the source of electricity and
geographic location. We source a significant amount of liquid hydrogen based on the chlor alkali process today. Additionally, we manufacture and sell fuel cell products to replace batteries and diesel
generators in stationary backup power applications. These products have proven valuable with telecommunications, transportation and utility customers as robust, reliable and sustainable power
solutions. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
provide and continue to develop commercially-viable hydrogen and fuel cell solutions for industrial mobility applications (including electric forklifts and electric industrial
vehicles) at multi shift high volume manufacturing and high throughput distribution sites where we believe our products and services provide a unique combination of productivity, flexibility and
environmental benefits. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
current products and services include: </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GenDrive:</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;GenDrive is our hydrogen fueled PEM fuel cell system providing power to material handling electric vehicles, including
class&nbsp;1, 2, 3
and 6 electric forklifts and ground support equipment; </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GenFuel:</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;GenFuel is our hydrogen fueling delivery, generation, storage and dispensing system; </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GenCare:</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;GenCare is our ongoing 'internet of things'-based maintenance and on-site service program for GenDrive fuel cell systems,
GenSure fuel cell
systems, GenFuel hydrogen storage and dispensing products and ProGen fuel cell engines; </FONT></P>
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 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>S-3</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><I> </i></font></p>
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 <P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GenSure:</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;GenSure is our stationary fuel cell solution providing scalable, modular PEM fuel cell power to support the backup and
grid-support power
requirements of the telecommunications, transportation, and utility sectors; </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GenKey:</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;GenKey is our vertically integrated "turn-key" solution combining either GenDrive or GenSure fuel cell power with GenFuel fuel
and GenCare
aftermarket service, offering complete simplicity to customers transitioning to fuel cell power; and </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ProGen:</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;ProGen is our fuel cell stack and engine technology currently used globally in mobility and stationary fuel cell systems, and
as engines in
electric delivery vans. This includes the Plug Power MEA (membrane electrode assembly), a critical component of the fuel cell stack used in zero-emission fuel cell electric vehicle engines, in which
Plug Power is the largest producer in North America. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
provide our products worldwide through our direct product sales force, and by leveraging relationships with original equipment manufacturers and their dealer networks. We manufacture
our commercially-viable products in Latham, New York. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To
promote fuel cell adoption and maintain post-sale customer satisfaction, we offer a range of service and support options through extended maintenance contracts. Additionally,
customers may waive our service option and choose to service their systems independently. A high percentage of fuel cells sold in recent years were bundled with maintenance contracts. As a result,
only approximately 0.2% of fuel cells deployed are still under standard warranty that is not a part of an extended maintenance contract. </FONT></P>

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Corporate Information  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We were organized in the State of Delaware on June&nbsp;27, 1997. Our principal executive offices are located at 968 Albany-Shaker Road,
Latham, New York, 12110, and our telephone number is (518)&nbsp;782-7700. Our corporate website address is www.plugpower.com. The information found on, or otherwise accessible through, our website
is not deemed to be a part of this prospectus or any
applicable prospectus supplement. Our common stock trades on the Nasdaq Capital Market under the symbol "PLUG." As of June&nbsp;30, 2020, we had 995 employees, including 287 temporary employees. </FONT></P>
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<P style="font-family:times;"><FONT SIZE=2><I> </i></font></p>
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<BR></FONT><FONT SIZE=2><B>  The Offering    <BR>    </B></FONT></P>
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<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Common stock offered by the selling stockholders</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>3,458,254 shares of common stock</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Use of proceeds</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:0pt;text-indent:0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>We will not receive any proceeds from the sale of the shares of common stock covered by this prospectus
supplement.</FONT></TD>
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<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Nasdaq Capital Market symbol</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:0pt;text-indent:0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>"PLUG"</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Risk factors</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:0pt;text-indent:0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Investing in our common stock involves a high degree of risk. See "Risk Factors" in this prospectus supplement and the
accompanying prospectus and the sections captioned "Risk Factors" contained in our <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020002267/plug-20191231x10k.htm">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31,
2019</A>, <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020005975/plug-20200331x10q.htm">Quarterly Report on Form&nbsp;10-Q for the quarter ended March&nbsp;31, 2020</A>, <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020010213/plug-20200630x10q.htm">Quarterly Report on Form&nbsp;10-Q for the quarter ended June&nbsp;30, 2020</A> and other filings that are incorporated by reference in this prospectus
supplement and the accompanying prospectus.</FONT></TD>
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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="dc48101_risk_factors"> </A>
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<BR></FONT><FONT SIZE=2><B>  RISK FACTORS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Investing in our common stock involves a high degree of risk. Before deciding whether to invest in our common stock, you should carefully
consider the risks and uncertainties described under "Risk Factors" in the accompanying prospectus and in the documents incorporated by reference herein and therein, including our
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020002267/plug-20191231x10k.htm">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31,
2019</A>, <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020005975/plug-20200331x10q.htm">Quarterly Report on Form&nbsp;10-Q for the quarter ended
March&nbsp;31, 2020</A> and <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020010213/plug-20200630x10q.htm">Quarterly Report on Form&nbsp;10-Q for the
quarter ended June&nbsp;30, 2020</A>, as the same may be amended, supplemented or superseded by the risks and uncertainties described under similar headings in the other documents that
are filed after the date hereof and incorporated by reference into this prospectus supplement and the accompanying prospectus. Some of these factors relate principally to our business and the industry
in which we operate. Other factors relate principally to your investment in our securities. These risks and uncertainties are not the only risks facing us. Additional risks and
uncertainties not presently known to us or that we currently deem immaterial may also materially and adversely affect our business and operations. For more information, see "Where You Can Find
Additional Information." </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>S-6</FONT></P>

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<A NAME="toc_dc48101_2"> </A>
<BR></FONT><FONT SIZE=2><B>  CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus supplement and the accompanying prospectus contain and/or incorporate by reference statements that are not historical facts and
are considered forward-looking within the meaning of Section&nbsp;27A of the Securities Act of 1933, as amended, and Section&nbsp;21E of the Securities Exchange Act of 1934, as amended, or the
Exchange Act. These forward-looking statements contain projections of our future results of operations or of our financial position or state other forward-looking information. In some cases, you can
identify these statements by forward-looking words such as "anticipate," "believe," "could," "continue," "estimate," "expect," "intend," "may," "should," "will," "would," "plan," "projected" or the
negative of such words or other similar words or phrases. We believe that it is important to communicate our future expectations to our investors. However, there may be events in the future that we
are not able to accurately predict or control and that may cause our actual results to differ materially from the expectations we describe in our forward-looking statements. Investors are cautioned
not to unduly rely on forward-looking statements because they involve risks and uncertainties, and actual results may differ materially from those discussed as a result of various factors, including,
but not limited to: the risk that we continue to incur losses and might never achieve or maintain profitability; the risk that we will need to raise additional capital to fund our operations and such
capital may not be available to us; the risk of dilution to our stockholders and/or stock price should we need to raise additional capital; the risk that our lack of extensive experience in
manufacturing and marketing products may impact our ability to manufacture and market products on a profitable and large-scale commercial basis; the risk that unit orders may not ship, be installed
and/or converted to revenue, in whole or in part; the risk that a loss of one or more of our major customers, or if one of our major customers delays payment of or is unable to pay its receivables, a
material adverse effect could result on our financial condition; the risk that a sale of a significant number of shares of stock could depress the market price of our common stock; the risk that our
convertible senior notes, if settled in cash, could have a material effect on our financial results; the risk that our convertible note hedges may affect the value of our convertible senior notes and
our common stock; the risk that negative publicity related to our business or stock could result in a negative impact on our stock value and profitability; the risk of potential losses related to any
product liability claims or contract disputes; the risk of loss related to an inability to maintain an effective system of internal controls; our ability to attract and maintain key personnel; the
risks related to the use of flammable fuels in our products; the risk that pending orders may not convert to purchase orders, in whole or in part; the cost and timing of developing, marketing and
selling our products; the risks of delays in or not completing our product development goals; our ability to obtain financing arrangements to support
the sale or leasing of our products and services to customers; our ability to achieve the forecasted gross margin on the sale of our products; the cost and availability of fuel and fueling
infrastructures for our products; the risks, liabilities, and costs related to environmental, health and safety matters; the risk of elimination of government subsidies and economic incentives for
alternative energy products; market acceptance of our products and services, including GenDrive, GenSure and GenKey systems; our ability to establish and maintain relationships with third parties with
respect to product development, manufacturing, distribution and servicing, and the supply of key product components; the cost and availability of components and parts for our products; the risk that
possible new tariffs could have a material adverse effect on our business; our ability to develop commercially viable products; our ability to reduce product and manufacturing costs; our ability to
successfully market, distribute and service our products and services internationally; our ability to improve system reliability for our products; competitive factors, such as price competition and
competition from other traditional and alternative energy companies; our ability to protect our intellectual property; the risk of dependency on information technology on our operations and the
failure of such technology; the cost of complying with current and future federal, state and international governmental regulations; our subjectivity to legal proceedings and legal compliance; the
risks associated with potential future acquisitions; the volatility of our stock price; and other risks and uncertainties described herein, as well as those risks </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>S-7</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>and
uncertainties referenced under "Risk Factors" of this prospectus supplement and in the accompanying prospectus or any free writing prospectus provided in connection with this offering and any
documents incorporated by reference herein or therein. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Although
we presently believe that the plans, expectations and anticipated results expressed in or suggested by the forward-looking statements contained in or incorporated by reference
into this prospectus are reasonable, all forward-looking statements are inherently subjective, uncertain and subject to change, as they involve substantial risks and uncertainties, including those
beyond our control. New factors emerge from time to time, and it is not possible for us to predict the nature, or assess the potential impact, of each new factor on our business. Given these
uncertainties, we caution you not to place undue reliance on these forward-looking statements. These forward-looking statements speak only as of the date on which the statements were made and are not
guarantees of future performance. Except as may be required by applicable law, we do not undertake or intend to update any forward-looking statements after the date of this prospectus supplement or
the respective dates of documents incorporated herein or therein or any free writing prospectus provided in connection with this offering that include forward-looking statements. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
above list of risks and uncertainties is only a summary of some of the most important factors and is not intended to be exhaustive. Additional information regarding risk factors that
may affect us is included in our Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2019, as amended and supplemented by our Quarterly Report on Form&nbsp;10-Q for the quarter
ended March&nbsp;31, 2020 and Quarterly Report on Form&nbsp;10-Q for the quarter ended June&nbsp;30, 2020. The risk factors contained in our Annual Report and Quarterly Reports may be updated by
us from time to time in subsequent
Quarterly Reports on Form&nbsp;10-Q, Current Reports on Form&nbsp;8-K and other filings we make with the SEC. </FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="dc48101_use_of_proceeds"> </A>
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<BR></FONT><FONT SIZE=2><B>  USE OF PROCEEDS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The selling stockholders will receive all of the proceeds from the sale or other disposition of the shares of common stock covered by this
prospectus supplement. We will not receive any of the proceeds from the sale or other disposition of the shares of common stock offered hereby. </FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="de48101_selling_stockholders"> </A>
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<BR></FONT><FONT SIZE=2><B>  SELLING STOCKHOLDERS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Up to 3,458,254 shares of our common stock are being offered by this prospectus supplement, all of which are being registered for resale for the
accounts of the selling stockholders. The selling stockholders acquired these shares from us in connection with our acquisition of Giner ELX,&nbsp;Inc. pursuant to the Merger Agreement. The shares
were issued in reliance upon Section&nbsp;4(a)(2) of the Securities Act. Pursuant to the Merger Agreement, we have agreed to file&nbsp;a prospectus supplement with the SEC for the purposes of
registering for resale the shares of our common stock issued to the selling stockholders. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have prepared the following table based on information provided by the selling stockholders in writing to us specifically for use in this prospectus supplement. We have not
independently verified this information. The registration for resale of the shares of common stock does not necessarily mean that the selling stockholders will sell all or any of these shares. In
addition, because the selling stockholders may sell, transfer or otherwise dispose of all, some or none of the shares of our common stock covered
by this prospectus supplement, we cannot determine the number of such shares that will be sold, transferred or otherwise disposed of by the selling stockholders, or the amount or percentage of shares
of our common stock that will be held by the selling stockholders upon termination of this offering. When we refer to "selling stockholders" in this prospectus supplement, we mean such selling
stockholders listed in the table below, as well as their respective pledgees, donees, assignees, transferees and other successors-in-interest and others who may hold any of such selling stockholders'
interest received after the date of this prospectus supplement from the selling stockholders as a gift, pledge, partnership distribution or other non-sale related transfer. See "Plan of Distribution"
for additional information. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For
purposes of the table below, we assumed that the selling stockholders will sell all their shares of common stock covered by this prospectus supplement. Percentage of shares
beneficially owned is based on 366,463,892 shares of our common stock outstanding as of August&nbsp;10, 2020, determined in accordance with Rule&nbsp;13d-3 under the Exchange Act. Under such rule,
beneficial ownership includes any shares over which the selling stockholders have sole or shared voting power or investment power and also any shares that the selling stockholders have the right to
acquire within 60&nbsp;days of such date through the exercise of any options or other rights. We believe, based on information supplied by the selling stockholders, that the selling stockholders
have sole voting and investment power with respect to the common stock reported as beneficially owned by them. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To
our knowledge, the selling stockholders do not have, and within the past three years have not had, any position, office or other material relationship with us or any of our
affiliates, other than acquiring beneficial ownership of our common stock pursuant to the Merger Agreement. To our knowledge, the selling stockholders are not broker-dealers, nor at the time of the
acquisition of our common stock did the selling stockholders have direct or indirect agreements or understandings with any person to distribute any of our common stock. </FONT></P>
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<TH style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="LEFT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TH>
<TH ALIGN="LEFT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TH>
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<TH COLSPAN=5 ROWSPAN=3 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Shares<BR>
Beneficially<BR>
Owned After<BR>
Offering </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
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<TH ALIGN="LEFT" style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT><BR></TH>
<TH ROWSPAN=2 style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=4 ROWSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Shares Beneficially<BR>
Owned Prior to<BR>
Offering </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="LEFT" style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
</TR>
<TR VALIGN="BOTTOM">
<TH ALIGN="LEFT" style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT><BR></TH>
<TH ROWSPAN=2 style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ROWSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Number of<BR>
Shares Being<BR>
Offered </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
</TR>
<TR VALIGN="BOTTOM">
<TH NOWRAP  ALIGN="LEFT" style="font-family:times;"><DIV style="border-bottom:solid #000000 1.0pt;margin-bottom:0pt;width:auto;display:inline-block;*display:inline;zoom:1;;"><FONT SIZE=1><B>Selling Stockholders

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 </B></FONT></DIV></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Number </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Percent </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Number </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Percent </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
</TR>
<TR BGCOLOR="#CCEEFF" VALIGN="TOP">
<TD VALIGN="BOTTOM" style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Giner,&nbsp;Inc.(1)(6)</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>2,527,074</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>2,527,074</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&#151;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&#151;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR BGCOLOR="White" VALIGN="TOP">
<TD VALIGN="BOTTOM" style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>H2B2 Electrolysis Technologies,&nbsp;Inc.(2)(6)</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>792,077</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>792,077</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&#151;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&#151;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR BGCOLOR="#CCEEFF" VALIGN="TOP">
<TD VALIGN="BOTTOM" style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Andrew Belt(3)(6)</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>66,813</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>66,813</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&#151;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&#151;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR BGCOLOR="White" VALIGN="TOP">
<TD VALIGN="BOTTOM" style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Hector Maza(4)(6)</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>41,987</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>41,987</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&#151;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&#151;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR BGCOLOR="#CCEEFF" VALIGN="TOP">
<TD VALIGN="BOTTOM" style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Cortney Mittelsteadt(5)(6)</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>30,303</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>30,303</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&#151;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&#151;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
</TABLE></DIV>
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 </DIV>
<DIV style="padding:0pt;position:relative;text-align:left;margin-left:10%;">
 <DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>*</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Less
than 1%. </FONT></DD></DL>
 </DIV>
 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>S-10</FONT></P>

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<P style='font-family:times;page-break-before:always'></p>
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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg48101a_main_toc">Table of Contents</A></FONT></P>
 <DIV style="padding:0pt;position:relative;text-align:left;margin-left:10%;">
 <DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(1)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>The
amount reported represents 584,707 shares held of record by Giner,&nbsp;Inc., a Delaware corporation, and 1,942,367 shares held of record by the Jose D. Giner
1990 Trust, which is a majority stockholder of Giner,&nbsp;Inc. Each of Andrew Belt, the Chief Executive Officer, A. Silvana Giner, a director, and Jill Smith, a director, in his or her capacity as
an executive officer or director of Giner,&nbsp;Inc., has voting and investment control over the shares held of record by Giner,&nbsp;Inc. As such, each of Mr.&nbsp;Belt and Messes. Giner and
Smith may be deemed to beneficially own the shares held of record by Giner,&nbsp;Inc. As trustee of the Jose D. Giner 1990 Trust, A. Silvana Giner has voting and investment control over the shares
held of record by the Jose D. Giner 1990 Trust and may be deemed to beneficially own the shares held of record by the Jose D. Giner 1990 Trust. Each of them disclaims any such beneficial ownership.
The address of Giner,&nbsp;Inc. and the individuals named in this paragraph is 89 Rumford Avenue, Newton, MA&nbsp;02466.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(2)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>The
amount reported represents shares held of record by H2B2 Electrolysis Technologies,&nbsp;Inc., a Delaware corporation. Each of Felipe Benjumea, Blanca de
Porres, Jose J. Brey, Chief Executive Officer, &Aacute;frica Castro, Gonzalo Hidalgo, Ignacio Sol&iacute;s, Fernando Franco and Juan Suarez, in his or her capacity as an executive
officer or member of the board of directors of H2B2 Electrolysis Technologies,&nbsp;Inc., has voting and investment control over the shares. As such, each of them may be deemed to beneficially own
the shares held of record by H2B2 Electrolysis Technologies,&nbsp;Inc. Each of them disclaims any such beneficial ownership. The address of H2B2 Electrolysis Technologies,&nbsp;Inc. and the
individuals named in this paragraph is 221 North Broad Street, Wilmington, DE 19709.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(3)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>The
amount reported represents shares held of record by Andrew Belt. Mr.&nbsp;Belt is the Chief Executive Officer of Giner,&nbsp;Inc. and has voting and
investment control over these shares. The address of Mr.&nbsp;Belt is 55 Williston Road, Brookline, MA 02445.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(4)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>The
amount reported represents shares held of record by Hector Maza. Mr.&nbsp;Maza is the Vice President of Electrolyzer Sales at Plug Power&nbsp;Inc. and has
voting and investment control over these shares. The address of Mr.&nbsp;Maza is 112 Glezen Lane, Wayland, MA 01778.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(5)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>The
amount reported represents shares held of record by Cortney Mittelsteadt. Mr.&nbsp;Mittelsteadt is the Vice President of Electrolyzer Technology at Plug
Power&nbsp;Inc. and has voting and investment control over these shares. The address of Mr.&nbsp;Mittelsteadt is 93 Lake Road Terrace, Wayland, MA&nbsp;01778.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(6)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>No
other shares of common stock, including, without limitation, shares of common stock acquired in the open market are being offered under this prospectus
supplement.  </FONT></DD></DL>
 </DIV>
 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>S-11</FONT></P>

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</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg48101a_main_toc">Table of Contents</A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="dg48101_plan_of_distribution"> </A>
<A NAME="toc_dg48101_1"> </A>
<BR></FONT><FONT SIZE=2><B>  PLAN OF DISTRIBUTION    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The selling stockholders may sell all or a portion of the shares of common stock held by them and offered hereby from time to time directly or
through one or more underwriters, broker-dealers or agents. If the shares of common stock are sold through underwriters, broker-dealers, or agents, the selling stockholders will be responsible for
underwriting discounts or commissions or agent's commissions. The shares of common stock may be sold in one or more transactions at fixed prices, at prevailing market prices at the time of the sale,
at varying prices determined at the time of sale or at negotiated prices. These sales may be effected in transactions, which may involve crosses or block transactions, pursuant to one or more of the
following methods:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> on any national securities exchange or quotation service on which the shares of common stock may be listed or quoted at the time of sale; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> in the over-the-counter market; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> in transactions otherwise than on these exchanges or systems or in the over-the-counter market; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> through the writing or settlement of options, whether such options are listed on an options exchange or otherwise; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> ordinary brokerage transactions and transactions in which the broker-dealer solicits purchasers; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> block trades in which the broker-dealer will attempt to sell the shares of common stock as agent but may position and resell a portion of the
block as principal to facilitate the transaction; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> purchases by a broker-dealer as principal and resale by the broker-dealer for its account; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> an exchange distribution in accordance with the rules of the applicable exchange; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> privately negotiated transactions; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> short sales made after the date the registration statement is declared effective by the SEC; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> broker-dealers may agree with the selling stockholders to sell a specified number of such shares at a stipulated price per share; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> a combination of any such methods of sale; and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any other method permitted pursuant to applicable law. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
selling stockholders may also sell shares of common stock under Rule&nbsp;144 promulgated under the Securities Act, if available, rather than under this prospectus supplement. In
addition, the selling stockholders may transfer the shares of common stock by other means not described in this prospectus supplement. If the selling stockholders effect such transactions by selling
shares of common stock to or through underwriters, broker-dealers or agents, such underwriters, broker-dealers or agents may receive commissions in the form of discounts, concessions or commissions
from the selling stockholders or commissions from purchasers of the shares of common stock for whom they may act as agent or to whom they may sell as principal (which discounts, concessions or
commissions as to particular underwriters, broker-dealers or agents may be in excess of those customary in the types of transactions involved). In connection with sales of the shares of common stock
or otherwise, the selling stockholders may enter into hedging transactions with broker-dealers, which may in turn engage in short sales of the shares of common stock in the course of hedging in
positions they assume. The selling stockholders may also sell shares of common stock short and deliver shares of common stock covered by this prospectus supplement to close out short positions and to
return borrowed shares in connection with such short sales. The selling stockholders may also loan or pledge shares of common stock to broker-dealers that in turn may sell such shares. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>S-12</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg48101a_main_toc">Table of Contents</A></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
selling stockholders may pledge or grant a security interest in some or all of the shares of common stock owned by it and, if it defaults in the performance of its secured
obligations, the pledgees or secured parties may offer and sell the shares of common stock from time to time pursuant to this prospectus supplement. The selling stockholders also may transfer and
donate the shares of common stock in other circumstances in which case the pledgees, transferees, donees, or other successors in interest will be the selling beneficial owners for purposes of this
prospectus supplement. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To
the extent required by the Securities Act and the rules and regulations thereunder, the selling stockholders and any broker-dealer participating in the distribution of the shares of
common stock may be deemed to be "underwriters" within the meaning of the Securities Act, and any commission paid, or any discounts or concessions allowed to, any such broker-dealer may be deemed to
be underwriting commissions or discounts under the Securities Act. At a time a particular offering of shares of our common stock is made, an additional prospectus supplement, if required, may be
distributed that will set forth the number of shares of our common stock being offered, the method of distribution and the terms of the offering, including the name or names of any underwriters,
dealers or agent, the purchase price paid by any underwriter and any discount. In order to comply with the securities laws of some states, if applicable, the shares of our common stock may be sold in
these jurisdictions only through registered or licensed brokers or dealers. In addition, in some states the shares of our common stock may not be sold unless it has been registered or qualified for
sale or an exemption from registration or qualification requirements is available and is complied with. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
selling stockholders and any other person participating in such distribution will be subject to applicable provisions of the Exchange Act and the rules and regulations thereunder,
including, without limitation, to the extent applicable, Regulation&nbsp;M of the Exchange Act, which may limit the timing of purchases and sales of any of the shares of common stock by the selling
stockholders and any other participating person. To the extent applicable, Regulation&nbsp;M may also restrict the ability of any person engaged in the distribution of the shares of common stock to
engage in market-making activities with respect to the shares of common stock. All of the foregoing may affect the marketability of the shares of common stock and the ability of any person or entity
to engage in market-making activities with respect to the shares of common stock. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To
the extent applicable, we will make copies of this prospectus supplement (as it may be supplemented or amended from time to time) available to the selling stockholders for the purpose
of satisfying the prospectus delivery requirements of the Securities Act. The selling stockholders may indemnify any broker-dealer that participates in transactions involving the sale of the shares
against certain liabilities, including liabilities arising under the Securities Act. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will not receive any proceeds from sales of any shares of common stock by the selling stockholders. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have agreed to indemnify the selling stockholders against liabilities, including liabilities under the Securities Act and state securities laws, relating to the registration of the
shares offered by this prospectus supplement. We have agreed with the selling stockholders to keep a registration statement covering the resale of the shares of common stock effective until the date
on which all of the shares
covered by this prospectus supplement have been sold in any manner, or may be sold without limitation pursuant to Rule&nbsp;144 under the Securities Act. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
cannot assure you that the selling stockholders will sell all or any portion of the shares of common stock offered hereby. We are registering the resale of shares of our common stock
to provide the selling stockholders with freely tradable securities, but the registration of such shares does not necessarily mean that any of such shares will be offered or sold by the selling
stockholders pursuant to this prospectus supplement or at all. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To
the extent required, this prospectus supplement may be amended and/or supplemented from time to time to describe a specific plan of distribution. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>S-13</FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="di48101_legal_matters"> </A>
<A NAME="toc_di48101_1"> </A>
<BR></FONT><FONT SIZE=2><B>  LEGAL MATTERS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The validity of the securities being offered by this prospectus supplement will be passed upon by Goodwin Procter&nbsp;LLP, Boston,
Massachusetts. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="di48101_experts"> </A>
<A NAME="toc_di48101_2"> </A>
<BR></FONT><FONT SIZE=2><B>  EXPERTS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The consolidated financial statements of Plug Power&nbsp;Inc. and subsidiaries as of December&nbsp;31, 2019 and 2018, and for each of the
years in the three year period ended December&nbsp;31, 2019, and management's assessment of the effectiveness of internal control over financial reporting as of December&nbsp;31, 2019 have been
incorporated by reference herein and in the registration statement in
reliance upon the report of KPMG&nbsp;LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing.
The audit report covering the December&nbsp;31, 2019 consolidated financial statements refers to a change in the Company's method of accounting for leases due to the adoption of new accounting
guidance. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="di48101_where_you_can_find_additional_information"> </A>
<A NAME="toc_di48101_3"> </A>
<BR></FONT><FONT SIZE=2><B>  WHERE YOU CAN FIND ADDITIONAL INFORMATION    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We file annual, quarterly and special reports, proxy statements and other information with the SEC. The SEC maintains a website that contains
reports, proxy and information statements and other information regarding registrants that file electronically with the SEC at www.sec.gov. In addition, we maintain a website that contains information
about us at www.plugpower.com. The information found on, or otherwise accessible through, this website is not incorporated into, and does not form&nbsp;a part of, this prospectus supplement or any
other report or document we file with or furnish to the SEC. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have filed with the SEC a registration statement on Form&nbsp;S-3, of which this prospectus supplement and the accompanying prospectus forms&nbsp;a part. This prospectus
supplement and the accompanying prospectus do not contain all of the information set forth in the registration statement and exhibits and schedules to the registration statement. For further
information with respect to the Company and the securities registered hereby, reference is made to the registration statement, including the exhibits to the registration statement. Statements
contained in this prospectus supplement and the accompanying prospectus as to the contents of any contract or other document referred to, or incorporated by reference in, this prospectus supplement
and the accompanying prospectus are not necessarily complete and, where that contract is an exhibit to the registration statement, each statement is qualified in all respects by the exhibit to which
the reference relates. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="di48101_incorporation_of_certain_information_by_reference"> </A>
<A NAME="toc_di48101_4"> </A>
<BR></FONT><FONT SIZE=2><B>  INCORPORATION OF CERTAIN INFORMATION BY REFERENCE    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The SEC allows us to "incorporate by reference" the information we file with it, which means that we can disclose important information to you
by referring you to those documents instead of having to repeat the information in this prospectus supplement. The information incorporated by reference is considered to be part of this prospectus
supplement, and later information that we file with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below that we have filed with the
SEC:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>  <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020002267/plug-20191231x10k.htm">our Annual Report on
Form&nbsp;10-K for the year ended December&nbsp;31, 2019, filed with the SEC on March&nbsp;10, 2020;</A></FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our Quarterly Reports on Form&nbsp;10-Q for the quarters ended March&nbsp;31, 2020 and June&nbsp;30, 2020, filed with the SEC on
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020005975/plug-20200331x10q.htm">May&nbsp;8, 2020</A> and
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020010213/plug-20200630x10q.htm">August&nbsp;10, 2020</A>, respectively; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000104746920002700/a2241489zdef14a.htm">Definitive Proxy Statement on
Schedule&nbsp;14A filed with the SEC on April&nbsp;29, 2020</A> (solely to the extent specifically incorporated by reference into the
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020002267/plug-20191231x10k.htm">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31,
2019</A>); </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>S-14</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg48101a_main_toc">Table of Contents</A></FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our Current Reports on Form&nbsp;8-K filed with the SEC on
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465920044524/tm2014001-2_8k.htm">April&nbsp;8, 2020</A>,
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465920045975/tm2014001-1_8k.htm">April&nbsp;13, 2020</A>,
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465920057768/tm2018808d1_8k.htm">May&nbsp;7, 2020</A> (solely with respect to Items&nbsp;1.01 and 2.03),
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465920061165/tm2019391d1_8k.htm">May&nbsp;14, 2020</A>,
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465920063852/tm2020176d1_8k.htm">May&nbsp;19, 2020</A>,
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465920071381/tm2022170-1_8k.htm">June&nbsp;9, 2020</A>,
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465920075884/tm2023176-1_8k.htm">June&nbsp;23, 2020</A> (solely with respect to Items&nbsp;1.01, 2.03 and 3.02)
and <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465920095497/tm2027502d1_8k.htm">August&nbsp;14, 2020</A>; and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>  <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837020002267/plug-20191231ex4594e0a14.htm">the description of our
shares of common stock contained in Exhibit&nbsp;4.5 filed with our Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2019, including any amendment or report filed for the
purpose of updating such description.</A> </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
also incorporate by reference into this prospectus supplement all documents that we file with the SEC pursuant to Sections&nbsp;13(a), 13(c), 14 or 15(d) of the Exchange Act after
the date of this prospectus supplement until the selling stockholders have sold all of the shares covered by this prospectus supplement or the sale of shares by the selling stockholders pursuant to
this prospectus supplement has been terminated, except any future report or other document or portion thereof that is not deemed filed under such provisions. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You
may access our annual, quarterly and special reports, proxy statements and other information we file with the SEC, and amendments to any of these reports, free of charge on the SEC's
website. You may also access the documents incorporated by reference on our website at www.plugpower.com. The information contained in, or that can be accessed through, our website is not part of this
prospectus supplement and should not be relied upon. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will furnish without charge to each person, including any beneficial owner, to whom a prospectus supplement is delivered, on written or oral request of such person, a copy of any or
all of the documents incorporated by reference in this prospectus supplement (not including exhibits to such documents, unless such exhibits are specifically incorporated by reference in this
prospectus supplement or into such documents). You should direct any requests for documents to: </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>Plug
Power&nbsp;Inc.<BR>
968 Albany-Shaker Road<BR>
Latham, New York, 12110<BR>
Attention: General Counsel<BR>
Telephone: (518)&nbsp;782-7700 </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>S-15</FONT></P>

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</FONT> <FONT SIZE=2><A HREF="#bg48102a_main_toc">Table of Contents</A> </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><B>PROSPECTUS  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=5><B>PLUG POWER&nbsp;INC.  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=5><B>
<IMG SRC="g589866.jpg" ALT="LOGO" WIDTH="255" HEIGHT="91">
  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=4><B>Common Stock<BR>
Preferred Stock<BR>
Warrants<BR>
Debt Securities<BR>
Units  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=4><I>

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<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus describes securities that may be issued and sold from time to time by us or that may be offered and sold from time to time by
selling securityholders to be identified in the future. We may offer, in one or more series or classes, separately or together, the following securities: (i)&nbsp;shares of common stock, par value
$0.01 per share, (ii)&nbsp;shares of preferred stock, par value $0.01 per share, (iii)&nbsp;warrants to purchase shares of common stock, preferred stock and/or debt securities, (iv)&nbsp;debt
securities and (v)&nbsp;units comprised of one or more of the securities described in this prospectus in any combination. We refer to the common stock, preferred stock, warrants, debt securities and
units registered hereunder collectively as the "securities" in this prospectus. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
specific terms of each series or class of the securities will be set forth in the applicable prospectus supplement. The securities may be offered directly by us, through agents
designated from time to time by us, or to or through underwriters or dealers. These securities also may be offered by securityholders, if so provided in a prospectus supplement hereto. We will provide
specific information about any selling securityholders in one or more supplements to this prospectus. If any agents, dealers or underwriters are involved in the sale of any of the securities, their
names, and any applicable purchase price, fee, commission or discount arrangement between or among them will be set forth, or will be calculable from the information set forth, in the applicable
prospectus supplement. See the sections entitled "About this Prospectus" and the "Plan of Distribution" for more information. No securities may be sold without delivery of this prospectus and the
applicable prospectus supplement describing the method and terms of the offering of such series of securities. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
common stock is listed on the NASDAQ Capital Market under the symbol "PLUG." On November&nbsp;29, 2019, the last reported sale price of our common stock on the NASDAQ Capital
Market was $3.90. The applicable prospectus supplement will contain information, where applicable, as to any other listing, if any, on the NASDAQ Capital Market or any securities market or other
exchange of the securities covered by the applicable prospectus supplement. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><I>

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<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=3><B>Investing in our securities involves a high degree of risk. You should review carefully the risks and uncertainties
described under the heading "Risk Factors" contained in this prospectus beginning on page&nbsp;3 and any applicable prospectus supplement as well as those set forth in the documents incorporated by
reference into this prospectus or any applicable prospectus supplement.</B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT SIZE=2><B>Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these
securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.</B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><I>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
date of this prospectus is December&nbsp;2, 2019. </FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A NAME="BG48102A_main_toc"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A NAME="bg48102_table_of_contents"> </A>
<BR></FONT><FONT SIZE=2><B>  TABLE OF CONTENTS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>
<A NAME="BG48102_TOC"></A> </FONT></P>
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<TH ALIGN="LEFT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Page </B></FONT></TH>
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<TR VALIGN="TOP">
<TD style="font-family:times;"><A HREF="#h1"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>ABOUT THIS PROSPECTUS</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h1"><FONT SIZE=2>1</FONT></A></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><A HREF="#h2"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>OUR COMPANY</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h2"><FONT SIZE=2><BR>
2</FONT></A></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><A HREF="#h3"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>RISK FACTORS</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h3"><FONT SIZE=2><BR>
3</FONT></A></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><A HREF="#h4"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h4"><FONT SIZE=2><BR>
3</FONT></A></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><A HREF="#h5"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>USE OF PROCEEDS</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h5"><FONT SIZE=2><BR>
5</FONT></A></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><A HREF="#h6"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>DESCRIPTION OF COMMON STOCK AND PREFERRED STOCK</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h6"><FONT SIZE=2><BR>
6</FONT></A></TD>
</TR>
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<TD style="font-family:times;"><A HREF="#h7"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>DESCRIPTION OF WARRANTS</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h7"><FONT SIZE=2><BR>
13</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h8"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>DESCRIPTION OF DEBT SECURITIES</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h8"><FONT SIZE=2><BR>
15</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h9"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>DESCRIPTION OF UNITS</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
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<TD style="font-family:times;"><A HREF="#h10"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>SELLING SECURITYHOLDERS</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h10"><FONT SIZE=2><BR>
26</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h11"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>PLAN OF DISTRIBUTION</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h11"><FONT SIZE=2><BR>
27</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h12"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>LEGAL MATTERS</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h12"><FONT SIZE=2><BR>
28</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h13"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>EXPERTS</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
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28</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h14"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>WHERE YOU CAN FIND ADDITIONAL INFORMATION</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h14"><FONT SIZE=2><BR>
28</FONT></A></TD>
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<TD style="font-family:times;"><A HREF="#h15"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>INCORPORATION OF CERTAIN INFORMATION BY REFERENCE</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" VALIGN="BOTTOM" style="font-family:times;"><A HREF="#h15"><FONT SIZE=2><BR>
29</FONT></A></TD>
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<P style="font-family:times;"><FONT SIZE=2><A NAME="h1"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> ABOUT THIS PROSPECTUS  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission, or the SEC, using a "shelf"
registration process. Under this process, we may sell any combination of the securities described in this prospectus in one or more offerings, and selling securityholders may from time to time offer
and sell any such security owned by them. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
prospectus provides you with a general description of the securities we or the selling securityholders may offer. Each time we or any selling securityholder sell securities, we will
provide a prospectus supplement containing specific information about the terms of the applicable offering. A prospectus supplement may include a discussion of any risk factors or other special
considerations applicable to those securities or to us. A prospectus supplement may add, update or change information contained in this prospectus. If there is any inconsistency between the
information in this
prospectus and the applicable prospectus supplement, you should rely on the information in the prospectus supplement. Before you buy any of our securities, it is important for you to consider the
information contained in this prospectus and any prospectus supplement together with additional information described under the heading "Where You Can Find More Information." </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
or any selling securityholders may offer the securities directly, through agents, or to or through underwriters. The applicable prospectus supplement will describe the terms of the
plan of distribution and set forth the names of any agents or underwriters involved in the sale of the securities. See "Plan of Distribution" for more information on this topic. No securities may be
sold without delivery of a prospectus supplement describing the method and terms of the offering of those securities. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have not authorized anyone to provide you with information in addition to or different from that contained in this prospectus, any applicable prospectus supplement and any related
free writing prospectus. No dealer, salesperson or other person is authorized to give any information or to represent anything not contained in this prospectus, any applicable prospectus supplement or
any related free writing prospectus that we may authorize to be provided to you. You must not rely on any unauthorized information or representation. This prospectus is an offer to sell only the
securities offered hereby, but only under circumstances and in jurisdictions where it is lawful to do so. You should not assume that the information in this prospectus, any applicable prospectus
supplement, any information incorporated or deemed incorporated by reference herein or therein or any related free writing prospectus is accurate as of any date other than the date of such
information. Our business, financial condition, results of operations and prospects and the business may have changed since that date. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
prospectus contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All
of the summaries are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference as
exhibits to the registration statement of which this prospectus is a part, and you may obtain copies of those documents as described below under the heading "Where You Can Find Additional
Information." </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless
otherwise mentioned or unless the context requires otherwise, all references in this prospectus to "Plug Power," "we," "us," "our," or the "Company" refer to Plug
Power&nbsp;Inc. and its subsidiaries. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
prospectus and the information incorporated herein by reference includes trademarks, service marks and trade names owned by us or other companies. All trademarks, service marks and
trade names included or incorporated by reference into this prospectus, any applicable prospectus supplement or any related free writing prospectus are the property of their respective owners. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>1</FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> OUR COMPANY  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We are a leading provider of alternative energy technology focused on the design, development, commercialization and manufacture of hydrogen and
fuel cell systems used primarily for the material handling and stationary power markets. As part of the global drive to electrification, we have recently leveraged product proven in the material
handling vehicle space to enter new, adjacent, electric vehicle markets, specifically electric delivery vans. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
are focused on proton exchange membrane, or PEM, fuel cell and fuel processing technologies, fuel cell/battery hybrid technologies, and associated hydrogen storage and dispensing
infrastructure from which multiple products are available. A fuel cell is an electrochemical device that combines hydrogen and oxygen to produce electricity and heat without combustion. Hydrogen is
derived from hydrocarbon fuels such as liquid petroleum gas, or&nbsp;LPG, natural gas, propane, methanol, ethanol, gasoline or biofuels. We develop complete hydrogen generation, delivery, storage
and refueling solutions for customer locations. Currently, we obtain the majority of our hydrogen by purchasing it from fuel suppliers for resale to customers. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
our core business, we provide and continue to develop commercially-viable hydrogen and fuel cell product solutions to replace lead-acid batteries in electric material handling
vehicles and industrial trucks for some of the world's largest distribution and manufacturing businesses. We are focusing our efforts on industrial mobility applications (electric forklifts and
electric industrial vehicles) at multi-shift high volume manufacturing and high throughput distribution sites where our products and services provide a unique combination of productivity, flexibility
and environmental benefits. Additionally, we manufacture and sell fuel cell products to replace batteries and diesel generators in stationary backup power applications. These products prove valuable
with telecommunications, transportation and utility customers as robust, reliable and sustainable power solutions. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
current products and services include: </FONT></P>

<UL>

<P style="font-family:times;"><FONT SIZE=2>GenDrive:
GenDrive is our hydrogen fueled PEM fuel cell system providing power to material handling electric vehicles, including class&nbsp;1, 2, 3 and 6 electric forklifts and ground support
equipment. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>GenFuel:
GenFuel is our hydrogen fueling delivery, generation, storage and dispensing system. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>GenCare:
GenCare is our ongoing 'internet of things'-based maintenance and on-site service program for GenDrive fuel cells, GenSure products, GenFuel products and ProGen engines. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>GenSure:
GenSure is our stationary fuel cell solution providing scalable, modular PEM fuel cell power to support the backup and grid-support power requirements of the telecommunications,
transportation, and utility sectors. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>GenKey:
GenKey is our turn-key solution combining either GenDrive or GenSure power with GenFuel fuel and GenCare aftermarket service, offering complete simplicity to customers transitioning to fuel
cell power. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>ProGen:
ProGen is our fuel cell stack and engine technology currently used globally in mobility and stationary fuel cell systems, and as engines in electric delivery vans. </FONT></P>

</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
provide our products worldwide through our direct product sales force, and by leveraging relationships with original equipment manufacturers and their dealer networks. We manufacture
our commercially-viable products in Latham, NY. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
were organized in the State of Delaware on June&nbsp;27, 1997. Our principal executive offices are located at 968&nbsp;Albany-Shaker Road, Latham, New&nbsp;York, 12110, and our
telephone number is&nbsp;(518)&nbsp;782-7700. Our corporate website address is www.plugpower.com. The information found on, or otherwise accessible through, our website is not deemed to be a part
of this prospectus or any applicable prospectus supplement. Our common stock trades on the NASDAQ Capital Market under the symbol "PLUG." </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>2</FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> RISK FACTORS  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Investment in any securities offered pursuant to this prospectus involves risks. Before acquiring any offered securities pursuant to this
prospectus, you should carefully consider the information contained or incorporated by reference in this prospectus or in any accompanying prospectus supplement, including, without limitation, the
risks and uncertainties set forth under the heading "Risk Factors" in our most recent Annual Report on Form&nbsp;10-K, and the other information contained or incorporated by reference in this
prospectus, as updated by our subsequent filings under the Securities Exchange Act of 1934, as amended, or the Exchange Act, and the risk factors and other information contained in the applicable
prospectus supplement before acquiring any of such securities. The occurrence of any of these risks might cause you to lose all or a part of your investment in the offered securities. Please also
refer to the section below entitled "Cautionary Statement Regarding Forward-Looking Statements." </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A NAME="h4"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus contains statements that are not historical facts and are considered forward-looking within the meaning of Section&nbsp;27A of
the Securities Act of 1933, as amended, or the Securities Act, and Section&nbsp;21E of the Exchange Act. These forward-looking statements contain projections of our future results of operations or
of our financial position or state other forward-looking information. You can identify forward-looking statements by the use of forward-looking terminology such as "believes," "expects," "may,"
"will," "should," "seeks," "approximately," "intends," "plans," "estimates" or "anticipates" or the negative of these words and phrases or similar words or phrases which are predictions of or indicate
future events or trends and discussions which do not relate solely to historical matters. You can also identify forward-looking statements by discussions of strategy, plans or intentions. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;These
forward-looking statements involve known and unknown risks, uncertainties and other important factors that could cause our actual results, performance or achievements, or industry
results to differ materially from any predictions of future results, performance or achievements that we express or imply in this prospectus or in the information contained in or incorporated by
reference into this prospectus. Some of the risks, uncertainties and other important factors that may affect future results include, among others: the risk that we continue to incur losses and might
never achieve or maintain profitability; the risk that we will need to raise additional capital to fund our operations and such capital may not be available to us; the risk of dilution to our
stockholders and/or stock price should we need to raise additional capital; the risk that our lack of extensive experience in manufacturing and marketing products may impact our ability to manufacture
and market products on a profitable and large-scale commercial basis; the risk that unit orders may not ship, be installed and/or converted to revenue, in whole or in part; the risk that a loss of one
or more of our major customers, or if one of our major customers delays payment of or is unable to pay its receivables, a material adverse effect
could result on our financial condition; the risk that a sale of a significant number of shares of stock could depress the market price of our common stock; the risk that our convertible debt
securities, if settled in cash, could have a material effect on our financial results; the risk that our convertible note hedges may affect the value of our convertible debt securities and our common
stock; the risk that negative publicity related to our business or stock could result in a negative impact on our stock value and profitability; the risk of potential losses related to any product
liability claims or contract disputes; the risk of loss related to an inability to maintain an effective system of internal controls; our ability to attract and maintain key personnel; the risks
related to the use of flammable fuels in our products; the risk that pending orders may not convert to purchase orders, in whole or in part; the cost and timing of developing, marketing and selling
our products; the risks of delays in or not completing our product development goals; our ability to obtain financing arrangements to support the sale or leasing of our products and services to
customers; our ability to achieve the forecasted gross margin on the sale of our products; the cost and availability of fuel and fueling infrastructures for our products; the risk of elimination of
government subsidies and economic incentives for alternative energy products; market </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>3</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>acceptance
of our products and services, including GenDrive, GenSure and GenKey systems; our ability to establish and maintain relationships with third parties with respect to product development,
manufacturing, distribution and servicing and the supply of key product components; the cost and availability of components and parts for our products; the risk that possible new tariffs could have a
material adverse effect on our business; our ability to develop commercially viable products; our ability to reduce product and manufacturing costs; our ability to successfully market, distribute and
service our products and services internationally; our ability to improve system reliability for our products; competitive factors, such as price competition and competition from other traditional and
alternative energy companies; our ability to protect our intellectual property; the risk of dependency on information technology on our operations and the failure of such technology; the cost of
complying with current and future federal, state and international governmental regulations; our subjectivity to legal proceedings and legal compliance; the risks associated with potential future
acquisitions; the volatility of our stock price; and other risks and uncertainties described herein, as well as those risks and uncertainties discussed from time to time in our other reports and other
public filings with the SEC. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Although
we presently believe that the plans, expectations and anticipated results expressed in or suggested by the forward-looking statements contained in or incorporated by reference
into this prospectus are reasonable, all forward-looking statements are inherently subjective, uncertain and subject to change, as they involve substantial risks and uncertainties, including those
beyond our control. New factors emerge from time to time, and it is not possible for us to predict the nature, or assess the potential impact, of each new factor on our business. Given these
uncertainties, we caution you not to place undue reliance on these forward-looking statements. We undertake no obligation to update or revise any of our forward-looking statements for events or
circumstances that arise after the statement is made, except as otherwise may be required by law. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
above list of risks and uncertainties is only a summary of some of the most important factors and is not intended to be exhaustive. Additional information regarding risk factors that
may affect us is included in our Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2018. The risk factors contained in our Annual Report are updated by us from time to time in
Quarterly Reports on Form&nbsp;10-Q, Current Reports on Form&nbsp;8-K and other filings we make with the SEC. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>4</FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> USE OF PROCEEDS  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless otherwise indicated in the applicable prospectus supplement, we will use the net proceeds received by us from our sale of the securities
described in this prospectus for our working capital and other general corporate purposes, including capital expenditures. We may temporarily invest the net proceeds in a variety of capital
preservation instruments, including investment grade, interest bearing instruments and U.S. government securities, until they are used for their stated purpose. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless
otherwise set forth in the applicable prospectus supplement, we will not receive any proceeds in the event that securities are sold by a selling securityholder. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>5</FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> DESCRIPTION OF COMMON STOCK AND PREFERRED STOCK  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following description of our common stock and preferred stock, together with any additional information we include in any applicable
prospectus supplement or any related free writing prospectus, summarizes the material terms and provisions of our common stock and the preferred stock that we may offer under this prospectus. While
the terms we have summarized below will apply generally to any future common stock or preferred stock that we may offer, we will describe the particular terms of any class or series of these
securities in more detail in the applicable prospectus supplement or free writing prospectus. For the complete terms of our common stock and preferred stock, please refer to our amended and restated
certificate of incorporation (as amended), which we refer to herein as our certificate of incorporation, and our amended and restated bylaws, which we refer to herein as our bylaws, copies of which
are filed with the SEC. The terms of these securities may also be affected by the Delaware General Corporation Law, or the DGCL. The summary below and that contained in any applicable prospectus
supplement or any related free writing prospectus are
qualified in their entirety by reference to our certificate of incorporation and our bylaws. See "Where You Can Find Additional Information." </FONT></P>

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Authorized Capital  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our authorized capital stock consists of 750,000,000 shares of common stock, par value $0.01 per share, and 5,000,000 shares of preferred stock,
par value $0.01 per share. </FONT></P>

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Common Stock  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As of September&nbsp;30, 2019, 253,121,439 shares of our common stock were issued and outstanding (excluding 861,139 treasury shares). In
addition, as of September&nbsp;30, 2019, there were: (i)&nbsp;23,597,871 shares of common stock issuable upon the exercise of stock options at a weighted average exercise price of $2.44 per share;
(ii)&nbsp;4,333,560 shares of common stock issuable upon the vesting of restricted stock units; (iii)&nbsp;115,824,142 shares of common stock issuable upon exercise of warrants;
(iv)&nbsp;2,782,076 shares of common stock issuable upon conversion of our Series&nbsp;C Redeemable Convertible Preferred Stock at a conversion price of $0.2343 per share; (v)&nbsp;12,237,762
shares of common stock issuable upon conversion of our Series&nbsp;E Convertible Preferred Stock at a conversion price of $2.31 per share; (vi)&nbsp;43,630,020 shares of common stock issuable upon
conversion of our 5.5% Convertible Senior Notes due March&nbsp;15, 2023 at a conversion price of $2.29 per share ; (vii)&nbsp;15,503,876 shares of common stock issuable upon conversion of our 7.5%
Convertible Senior Note due January 2023 at a conversion price of $2.58 per share; and (viii)&nbsp;8,373,467 shares of our common stock reserved for future issuance under our equity incentive plans.
Additional shares of authorized common stock may be issued, as authorized by our board of directors from time to time, without stockholder approval, except as may be required by applicable securities
exchange requirements. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
holders of common stock possess exclusive voting rights in us, except to the extent of such rights reserved to holders of our Series&nbsp;C Redeemable Convertible Preferred Stock
and Series&nbsp;E Convertible Preferred Stock and to the extent our board of directors specifies voting power with respect to any other class of securities issued in the future. Each holder of our
common stock is entitled to one vote for each share held of record on each matter submitted to a vote of stockholders, including the election of directors. Stockholders do not have any right to
cumulate votes in the election of directors. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Subject
to the preferences that may be applicable to any then outstanding preferred stock, each holder of our common stock is entitled to share ratably in distributions to stockholders
and to receive ratably such dividends, if any, as may be declared from time to time by our board of directors out of legally
available funds. In the event of our liquidation, dissolution or winding up, holders of our common stock will be entitled to share ratably in the net assets legally available for distribution to </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>6</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>stockholders
after the payment of all of our debts and other liabilities, subject to the satisfaction of any liquidation preference granted to the holders of any outstanding shares of preferred stock
(including the Series&nbsp;C Redeemable Convertible Preferred Stock and Series&nbsp;E Convertible Preferred Stock). </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All
of the outstanding shares of our common stock are, and the shares of common stock issued upon the conversion of any securities convertible into our common stock will be, duly
authorized, fully paid and nonassessable. Holders of our common stock have no preemptive, conversion or subscription rights, and there are no redemption or sinking fund provisions applicable to our
common stock. The rights, preferences and privileges of the holders of our common stock are subject to, and may be adversely affected by, the rights of the holders of the Series&nbsp;C Redeemable
Convertible Preferred Stock and Series&nbsp;E Convertible Preferred Stock as well as the rights of any series of our preferred stock that we may designate and issue in the future. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
common stock trades on the NASDAQ Capital Market under the symbol "PLUG." </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Preferred Stock  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As of September&nbsp;30, 2019, 2,620 shares of Series&nbsp;C Redeemable Convertible Preferred Stock, par value $0.01 per share
("Series&nbsp;C Preferred Stock"), and 28,269 shares of Series&nbsp;E Convertible Preferred Stock, par value $0.01 per share ("Series&nbsp;E Preferred Stock"), were issued and outstanding. The
Company has authorized Series&nbsp;A Junior Participating Cumulative Preferred Stock, par value $0.01 per share. As of September&nbsp;30, 2019, there were no shares of Series&nbsp;A Junior
Participating Cumulative Preferred Stock issued and outstanding. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company's certificate of incorporation authorizes its board of directors to classify any unissued shares of preferred stock and to reclassify any previously classified but unissued
shares of any series into other classes or series of stock. We may issue preferred stock from time to time in one or more class or series, with the exact terms of each class or series established by
our board of directors. Prior to the issuance of shares of each class or series of preferred stock, the Company's board of directors will set the terms, preferences, conversion or other rights, voting
powers, restrictions, limitations as to
dividends or other distributions, qualifications and terms or conditions of redemption for each such class or series. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
preferences and other terms of the preferred stock of each class or series will be fixed by the certificate of designation relating to such class or series. We will incorporate by
reference into the registration statement of which this prospectus is a part the form of any certificate of designation that describes the terms of the series of preferred stock we are offering before
the issuance of the related series of preferred stock. The applicable prospectus supplement will specify the terms of the preferred stock, including, where applicable, the
following:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the title and stated value; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the number of shares we are offering; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the liquidation preference per share; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the purchase price; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the dividend rate, period and payment date and method of calculation for dividends; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> whether dividends will be cumulative or non-cumulative and, if cumulative, the date from which dividends will accumulate; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the procedures for any auction and remarketing, if any; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the provisions for a sinking fund, if any; </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>7</FONT></P>

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<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the provisions for redemption or repurchase, if applicable, and any restrictions on our ability to exercise those redemption and repurchase
rights; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any listing of the preferred stock on any securities exchange or market; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> whether the preferred stock will be convertible into our common stock, and, if applicable, the conversion price, or how it will be calculated,
and the conversion period; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> whether the preferred stock will be exchangeable into debt securities, and, if applicable, the exchange price, or how it will be calculated,
and the exchange period; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> voting rights, if any, of the preferred stock; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> preemptive rights, if any; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> restrictions on transfer, sale or other assignment, if any; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> whether interests in the preferred stock will be represented by depositary shares; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> a discussion of any material United States federal income tax considerations applicable to the preferred stock; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the relative ranking and preferences of the preferred stock as to dividend rights and rights if we liquidate, dissolve or wind up our affairs; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any limitations on the issuance of any class or series of preferred stock ranking senior to or on a parity with the series of preferred stock
as to dividend rights and rights if we liquidate, dissolve or wind up our affairs; and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any other specific terms, preferences, rights or limitations of, or restrictions on, the preferred stock. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless
otherwise specified in the applicable prospectus supplement, the preferred stock will, with respect to dividend rights and rights upon liquidation, dissolution or winding up of
the Company, rank: (i)&nbsp;senior to all classes or series of the common stock, and to any other class or series of the Company's
stock expressly designated as ranking junior to the preferred stock; (ii)&nbsp;on parity with any class or series of the Company's stock expressly designated as ranking on parity with the preferred
stock; and (iii)&nbsp;junior to any other class or series of the Company's stock expressly designated as ranking senior to the preferred stock. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
DGCL provides that the holders of preferred stock will have the right to vote separately as a class (or, in some cases, as a series) on an amendment to our certificate of
incorporation if the amendment would change the par value, the number of authorized shares of the class or the powers, preferences or special rights of the class or series so as to adversely affect
the class or series, as the case may be. This right is in addition to any voting rights that may be provided for in the applicable certificate of designation. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
board of directors may authorize the issuance of preferred stock with voting or conversion rights that could adversely affect the voting power or other rights of the holders of our
common stock. The issuance of preferred stock, while providing flexibility in connection with possible acquisitions and other corporate purposes, could, among other things, have the effect of
delaying, deferring or preventing a change in our control and may adversely affect the market price of the common stock and the voting and other rights of the holders of common stock. Additionally,
the issuance of preferred stock may have the effect of decreasing the market price of our common stock. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>8</FONT></P>

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Series&nbsp;C Redeemable Convertible Preferred Stock  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In May 2013, 10,431 shares of Series&nbsp;C Preferred Stock were issued at the original issue price of $248.794 per share, of which 2,620
shares remain outstanding as of September&nbsp;30, 2019. The Company's board of directors approved the certificate of designation, a copy of which has been previously filed with the SEC and which is
incorporated by reference as an exhibit to the registration statement of which this prospectus is a part, creating the Series&nbsp;C Preferred Stock. The following description of the Series&nbsp;C
Preferred Stock is qualified in its entirety by reference to such certificate of designation and the Company's certificate of incorporation. The Series&nbsp;C Preferred Stock is validly issued,
fully paid and nonassessable. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ranking.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Series&nbsp;C Preferred Stock ranks, with respect to dividend rights and rights upon the
Company's liquidation, dissolution or winding up, senior to all classes or series of the common stock and to any other class or series of stock expressly designated as ranking junior to the
Series&nbsp;C Preferred Stock, including the Series&nbsp;E Preferred Stock. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dividends.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Series&nbsp;C Preferred Stock is entitled to receive dividends at a rate of 8% per annum, based upon the original issue
price,
payable in equal quarterly installments, in preference to common stock and other junior securities, in cash or in shares of common stock, at our option. The Series&nbsp;C Preferred Stock is
convertible into shares of our common stock, at a conversion price equal to $0.2343 per share (as of September&nbsp;30, 2019 and subject to future adjustments), at the holder's option. As of
September&nbsp;30, 2019, the outstanding shares of our Series&nbsp;C Preferred Stock were convertible into an aggregate of 2,782,076 shares of our common stock. The Series&nbsp;C Preferred Stock
has weighted average anti-dilution protection. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Conversion Rights.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The holders of Series&nbsp;C Preferred Stock have the right, at their sole option, to convert the Series&nbsp;C
Preferred
Stock into shares of common stock at a conversion price in effect at the time of conversion; provided that such conversion price shall not be less than $0.1554 per share. The Series&nbsp;C Preferred
Stock may also be automatically converted at the then effective conversion rate upon the election by holders of at least 67% of the outstanding shares of Series&nbsp;C Preferred Stock under certain
circumstances. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Redemption Rights.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Series&nbsp;C Preferred Stock is redeemable by the Company upon the election of either the holders of the
Series&nbsp;C
Preferred Stock or us. If the redemption is at the election of the holders of the Series&nbsp;C Preferred Stock, the redemption price will be the original issue price plus any accrued and unpaid
dividends. If the redemption is at the election of the Company, the redemption price will be a per share price equal to the greater of (i)&nbsp;the original issue price per share plus any accrued
and unpaid dividends and (ii)&nbsp;the fair market value of a single share of Series&nbsp;C Preferred Stock. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Voting Rights.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The shares of Series&nbsp;C Preferred Stock vote together with the common stock on an as-converted basis on all matters,
including
the election of directors, except as otherwise required by law. Each share of Series&nbsp;C Preferred Stock is entitled to a number of votes equal to the number of whole shares of common stock into
which such share of Series&nbsp;C Preferred Stock is convertible. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Series&nbsp;E Convertible Preferred Stock  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In November 2018, 35,000 shares of Series&nbsp;E Preferred Stock were issued at the initial stated value of $1,000 per share, of which 28,269
shares remain outstanding as of September&nbsp;30, 2019. The Company's board of directors approved the certificate of designation, a copy of which has been previously filed with the SEC and which is
incorporated by reference as an exhibit to the registration statement of which this prospectus is a part, creating the Series&nbsp;E Preferred Stock. The following description of the Series&nbsp;E
Preferred Stock is qualified in its entirety by reference to such certificate of designation and the Company's certificate of incorporation. The Series&nbsp;E Preferred Stock is validly issued,
fully paid and nonassessable. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>9</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Maturity Date.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Series&nbsp;E Preferred Stock will mature on May&nbsp;2, 2020, unless extended at the option of the holders of the
Series&nbsp;E Preferred Stock. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ranking.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Except for the Series&nbsp;C Preferred Stock, the Series&nbsp;E Preferred Stock ranks, with respect to dividend rights and
rights upon
the Company's liquidation, dissolution or winding up, senior to all classes or series of the common stock and to any other class or series of stock expressly designated as ranking junior to the
Series&nbsp;E Preferred Stock. In the event of a liquidation, dissolution or winding up of the Company, the holders of Series&nbsp;E Preferred Stock will be entitled to receive in cash out of the
Company's assets after any amount that is required to be paid to the Series&nbsp;C Preferred Stock and before any amount shall be paid to the holders of any of capital stock ranking junior to the
Series&nbsp;E Preferred Stock, but pari passu with any capital stock then outstanding that ranks pari passu with the Series&nbsp;E Preferred Stock, an amount per share equal to the greater of
(A)&nbsp;125% of the conversion amount and (B)&nbsp;the amount per share such holder would receive if such holder converted such shares into common stock immediately prior to the date of such
payment. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dividends.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Series&nbsp;E Preferred Stock is not entitled to receive dividends, except in connection with certain purchase rights
and other
corporate events, as described in the certificate of designation, or in connection with certain distributions of assets, as described in the certificate of designation, or as, when and if declared by
the board of directors acting in its sole and absolute discretion. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Optional Installment Conversion or Redemption by the Company.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;On the first trading day of each calendar month commencing on May&nbsp;1,
2019 and
through, and including, April&nbsp;1, 2020, and on the maturity date (each an "Installment Date"), provided that all conditions set forth in the certificate of designation have been satisfied, the
Company will convert an amount equal to $2,693,000 in stated value of the Series&nbsp;E Preferred Stock (as such amount may be reduced by earlier conversion, redemption or otherwise) into shares of
common stock at the greater of (x)&nbsp;$0.55 and (y)&nbsp;the lowest of (i)&nbsp;the conversion price then in effect and (ii)&nbsp;85% of the average volume weighted average price, or VWAP,
of the common stock for the three lowest trading days during the seven consecutive trading day period immediately prior to the applicable Installment Date; provided, however, that the Company may
instead, at its option, pay such amount by redeeming shares of Series&nbsp;E Preferred Stock for cash at the applicable redemption price. If the equity conditions are not satisfied, then any holder
of the Series&nbsp;E Preferred Stock may require the Company to redeem the conversion amount at 125% of such designated portion of the conversion amount. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mandatory Conversion by the Company.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Company has the right, provided that no equity conditions failure exists, to require each
holder of
Series&nbsp;E Preferred Stock to convert all or any number of shares of Series&nbsp;E Preferred Stock held by such holder at the conversion rate if the closing sale price of our common stock
equals at least 175% of the conversion price for twenty consecutive trading days. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Optional Conversion by the Holders.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The holders of the Series&nbsp;E Preferred Stock are entitled to convert any whole number of shares
of
Series&nbsp;E Preferred Stock into shares of common stock at the conversion price of $2.31, subject to adjustments. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Maturity Redemption by the Holders.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;At any time from and after the tenth business day prior to the maturity date, any holder may require
the Company
to redeem all or any number of shares of Series&nbsp;E Preferred Stock held by such holder at a purchase price equal to 105% of the conversion amount. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Redemption/Conversion Option of the Holders upon a Triggering Event.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;After a triggering event (as described in the certificate of
designation), each
holder will have the right, at such holder's option, to require the Company to redeem and/or convert all or a portion of such holder's Series&nbsp;E Preferred Stock. Any such redemption would be at
a price per share equal to the greater of (i)&nbsp;120% of the </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>10</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>conversion
amount and (ii)&nbsp;the product of (A)&nbsp;the conversion rate in effect multiplied by (B)&nbsp;120% of the greatest closing sale price of the common stock on any trading day during
the period specified in the certificate of designation. Any such triggering event conversion would be at a conversion rate equal to the quotient of (i)&nbsp;120% of the conversion amount divided by
(ii)&nbsp;the lower of (A)&nbsp;the applicable conversion price in effect on the trading day immediately preceding the notice of conversion and (B)&nbsp;the greater of (1)&nbsp;$0.55 and
(2)&nbsp;75% of the lowest VWAP of the common stock on any trading day during the period specified in the certificate of designation. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Redemption Right of the Holders Upon a Change of Control.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;In the event of a fundamental transaction, as described in the certificate of
designation,
generally including, among other transactions, any merger with or into another entity in which the Company is not the surviving entity or the Company's stockholders immediately prior to such merger or
consolidation do not own at least 50% of the outstanding voting securities of the surviving entity, or a sale of all or substantially all of the Company's assets, each holder will have the right, at
such holder's option, to require the Company to redeem all or a portion of such holder's Series&nbsp;E Preferred Stock. Any such change of control redemption would be at a price per share equal to
125% of the greatest of (i)&nbsp;the conversion amount being redeemed, (ii)&nbsp;the product of (A)&nbsp;the conversion amount being redeemed multiplied by (B)&nbsp;the quotient determined by
dividing (1)&nbsp;the greatest closing sale price of the common stock during the period specified in the certificate of designation by (2)&nbsp;the conversion price, and (iii)&nbsp;the product
of (A)&nbsp;the conversion amount being redeemed and (B)&nbsp;the quotient determined by dividing (1)&nbsp;the aggregate cash consideration and the aggregate cash value of any non-cash
consideration per share of common stock to be paid to holders of the common stock upon consummation of such change of control by (2)&nbsp;the conversion price. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Voting Rights.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The shares of Series&nbsp;E Preferred Stock have no voting rights, except on matters required by law or under the
certificate of
designation to be submitted to a class vote of the holders of the Series&nbsp;E Preferred Stock. </FONT></P>

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Delaware Anti-Takeover Law and Provisions of our Certificate of Incorporation and Bylaws  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Delaware Anti-Takeover Law.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;We are subject to Section&nbsp;203 of the DGCL. Section&nbsp;203 generally prohibits a public Delaware
corporation
from engaging in a "business combination" with an "interested stockholder" for a period of three years after the date of the transaction in which the person became an interested stockholder,
unless:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> prior to the date of the transaction, the board of directors of the corporation approved either the business combination or the transaction
which resulted in the stockholder becoming an interested stockholder; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the interested stockholder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced,
excluding for purposes of determining the number of shares outstanding (a)&nbsp;shares owned by persons who are directors and also officers and (b)&nbsp;shares owned by employee stock plans in
which employee participants do not have the right to determine confidentially whether shares held subject to the plan will be tendered in a tender or exchange offer; or </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> on or subsequent to the date of the transaction, the business combination is approved by the board and authorized at an annual or special
meeting of stockholders, and not by written consent, by the affirmative vote of at least two-thirds of the outstanding voting stock which is not owned by the interested stockholder. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;203
defines a business combination to include:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any merger or consolidation involving the corporation and the interested stockholder; </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>11</FONT></P>

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<UL>
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<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any sale, transfer, pledge or other disposition involving the interested stockholder of 10% or more of the assets of the corporation; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> subject to exceptions, any transaction that results in the issuance or transfer by the corporation of any stock of the corporation to the
interested stockholder; and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the receipt by the interested stockholder of the benefit of any loans, advances, guarantees, pledges or other financial benefits provided by or
through the corporation. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
general, Section&nbsp;203 defines an interested stockholder as any entity or person beneficially owning 15% or more of the outstanding voting stock of the corporation or any entity
or person affiliated with or controlling or controlled by the entity or person. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><I> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Certificate of Incorporation and Bylaws.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Provisions of our certificate of incorporation and bylaws may delay or discourage transactions
involving an
actual or potential change in our control or change in our management, including transactions in which stockholders might otherwise receive a premium for their shares or transactions that our
stockholders might otherwise deem to be in their best interests. Therefore, these provisions could adversely affect the price of our common stock. Among other things, our certificate of incorporation
and bylaws:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> permit our board of directors to issue up to 5,000,000 shares of preferred stock, with any rights, preferences and privileges as they may
designate; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> provide that the authorized number of directors may be changed only by resolution of the board of directors; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> provide that all vacancies, including newly created directorships, may, except as otherwise required by law and subject to the rights of the
holders of any series of preferred stock, be filled by the affirmative vote of a majority of directors then in office, even if less than a quorum; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> divide our board of directors into three classes; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> generally require that any action to be taken by our stockholders must be effected at a duly called annual or special meeting of stockholders
and not be taken by written consent; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> provide that stockholders seeking to present proposals before a meeting of stockholders or to nominate candidates for election as directors at
a meeting of stockholders must provide notice in writing in a timely manner, and also specify requirements as to the form and content of a stockholder's notice; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> do not provide for cumulative voting rights (therefore allowing the holders of a majority of the shares of common stock entitled to vote in any
election of directors to elect all of the directors standing for election, if they should so choose); and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> provide that, except as otherwise required by statute and subject to the rights of the holders of any series of preferred stock, special
meetings of our stockholders may be called only by the board of directors pursuant to a resolution adopted by a majority of the directors then in office. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
amendment of any of these provisions, with the exception of the ability of our board of directors to issue shares of preferred stock and designate any rights, preferences and
privileges thereto, would require approval by the holders of at least two-thirds of our then outstanding common stock. </FONT></P>

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Transfer Agent and Registrar  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The transfer agent and registrar for our common stock and preferred stock is Broadridge Corporate Issuer Solutions,&nbsp;Inc. The transfer
agent and registrar's address is 1717 Arch Street, Suite&nbsp;1300, Philadelphia, Pennsylvania, 19103. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>12</FONT></P>

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</FONT> <FONT SIZE=2><A HREF="#bg48102a_main_toc">Table of Contents</A> </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A NAME="h7"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> DESCRIPTION OF WARRANTS  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We may issue warrants for the purchase of common stock, preferred stock and/or debt securities in one or more series. We may issue warrants
independently or together with common stock, preferred stock and/or debt securities, and the warrants may be attached to or separate from these securities. The following description, together with the
additional information we include in any applicable prospectus supplement or any related free writing prospectus, summarizes the material terms and provisions of the warrants that we may offer under
this prospectus and the related warrant agreements and warrant certificates. While the terms we have summarized below will apply generally to any future warrants that we may offer, we will describe
the particular terms of any series of warrants in more detail in the applicable prospectus supplement or free writing prospectus. The terms of any warrants offered under that prospectus supplement or
free writing prospectus may differ from the terms described below. The following description and any description of the warrants in a prospectus supplement or free writing prospectus may not be
complete and is subject to and qualified in its
entirety by reference to the terms and provisions of the warrant agreement and warrant certificate, which we will file with the SEC in connection with an issuance of the warrants. </FONT></P>

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General  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We will evidence each series of warrants by warrant certificates that we will issue under a separate warrant agreement. We will enter into the
warrant agreement with a warrant agent. We will indicate the name and address of the warrant agent in the applicable prospectus supplement relating to a particular series of warrants. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will describe in the applicable prospectus supplement the terms of the series of warrants, including:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the offering price and aggregate number of warrants offered; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the currency for which the warrants may be purchased; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> if applicable, the designation and terms of the securities with which the warrants are issued and the number of warrants issued with each such
security or each principal amount of such security; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> if applicable, the date on and after which the warrants and the related securities will be separately transferable; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> in the case of warrants to purchase debt securities, the principal amount of debt securities purchasable upon exercise of one warrant and the
price at, and currency in which, this principal amount of debt securities may be purchased upon such exercise; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> in the case of warrants to purchase common stock or preferred stock, the number of shares of common stock or preferred stock, as the case may
be, purchasable upon the exercise of one warrant and the price at which these shares may be purchased upon such exercise; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the effect of any merger, consolidation, sale or other disposition of our business on the warrant agreement and the warrants; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the terms of any rights to redeem or call the warrants; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any provisions for changes to or adjustments in the exercise price or number of securities issuable upon exercise of the warrants; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the periods during which, and places at which, the warrants are exercisable; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the manner of exercise; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the dates on which the right to exercise the warrants will commence and expire; </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>13</FONT></P>

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<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the manner in which the warrant agreement and warrants may be modified; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> federal income tax consequences of holding or exercising the warrants; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the offering price and aggregate number of warrants offered; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the terms of the securities issuable upon exercise of the warrants; and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any other specific terms, preferences, rights or limitations of or restrictions on the warrants. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prior
to the exercise of their warrants, holders of warrants will not have any of the rights of holders of the securities purchasable upon such exercise, including the right to receive
dividends, if any, or, payments upon our liquidation, dissolution or winding up or to exercise voting rights, if any. </FONT></P>

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Exercise of Warrants  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each warrant will entitle the holder to purchase the securities that we specify in the applicable prospectus supplement at the exercise price
that we describe in the applicable prospectus supplement. Unless we otherwise specify in the applicable prospectus supplement, holders of the warrants may exercise the warrants at any time up to the
specified time on the expiration date that we set forth in the applicable prospectus supplement. After the close of business on the expiration date, unexercised warrants will become void. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Holders
of the warrants may exercise the warrants by delivering the warrant certificate representing the warrants to be exercised together with specified information, and paying the
required amount to the warrant agent in immediately available funds, as provided in the applicable prospectus supplement. We will set forth on the reverse side of the warrant certificate and in the
applicable prospectus supplement the information that the holder of the warrant will be required to deliver to the warrant agent. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upon
receipt of the required payment and the warrant certificate properly completed and duly executed at the corporate trust office of the warrant agent or any other office indicated in
the applicable prospectus supplement, we will issue and deliver the securities purchasable upon such exercise. If fewer than all of the warrants represented by the warrant certificate are exercised,
then we will issue a new warrant certificate for the remaining amount of warrants. If we so indicate in the applicable prospectus supplement, holders of the warrants may surrender securities as all or
part of the exercise price for warrants. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Governing Law  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless we provide otherwise in the applicable prospectus supplement, the warrants and warrant agreements will be governed by and construed in
accordance with the laws of the State of New York. </FONT></P>

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Enforceability of Rights by Holders of Warrants  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each warrant agent will act solely as our agent under the applicable warrant agreement and will not assume any obligation or relationship of
agency or trust with any holder of any warrant. A single bank or trust company may act as warrant agent for more than one issue of warrants. A warrant agent will have no duty or responsibility in case
of any default by us under the applicable warrant agreement or warrant, including any duty or responsibility to initiate any proceedings at law or otherwise, or to make any demand upon us. Any holder
of a warrant may, without the consent of the related warrant agent or the holder of any other warrant, enforce by appropriate legal action its right to exercise, and receive the securities purchasable
upon exercise of, its warrants. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>14</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg48102a_main_toc">Table of Contents</A></FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A NAME="h8"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> DESCRIPTION OF DEBT SECURITIES  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We may issue senior debt securities from time to time, in one or more series, as either senior or subordinated debt or as senior or subordinated
convertible debt. While the terms we have summarized below will apply generally to any future debt securities we may offer under this prospectus, we will describe the particular terms of any debt
securities offered through that prospectus supplement or free writing prospectus. The terms of any debt securities we offer under a prospectus supplement or free writing prospectus may differ from the
terms we describe below. Unless the context requires otherwise, whenever we refer to the "indentures," we also are referring to any supplemental indentures that specify the terms of a particular
series of debt securities. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will issue any senior debt securities under the senior indenture that we will enter into with the trustee named in the senior indenture. We will issue any subordinated debt securities
under the subordinated indenture that we will enter into with the trustee named in the subordinated indenture. We have filed forms of these documents as exhibits to the registration statement, of
which this prospectus is a part, and supplemental indentures and forms of debt securities containing the terms of the debt securities being offered will be filed as exhibits to the registration
statement of which this prospectus is a part or will be incorporated by reference from reports that we file with the SEC. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
indentures will be qualified under the Trust Indenture Act of 1939, as amended, or the Trust Indenture Act. We use the term "trustee" to refer to either the trustee under the senior
indenture or the trustee under the subordinated indenture, as applicable. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
following summaries of material provisions of the senior debt securities, the subordinated debt securities and the indentures are subject to, and qualified in their entirety by
reference to, all of the provisions of the indenture applicable to a particular series of debt securities. We urge you to read the applicable prospectus supplement or free writing prospectus and any
related free writing prospectuses related to the debt securities that we may offer under this prospectus, as well as the complete applicable indenture that contains the terms of the debt securities.
Except as we may otherwise indicate, the terms of the senior indenture and the subordinated indenture are identical. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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General  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We will describe in the applicable prospectus supplement or free writing prospectus the terms of the series of debt securities being offered,
including:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the title; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the principal amount being offered, and if a series, the total amount authorized and the total amount outstanding; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any limit on the amount that may be issued; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> whether or not we will issue the series of debt securities in global form, and, if so, the terms and who the depository will be; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the maturity date; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> whether and under what circumstances, if any, we will pay additional amounts on any debt securities held by a person who is not a United States
person for tax purposes, and whether we can redeem the debt securities if we have to pay such additional amounts; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the annual interest rate, which may be fixed or variable, or the method for determining the rate and the date interest will begin to accrue,
the dates interest will be payable and the regular record dates for interest payment dates or the method for determining such dates; </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>15</FONT></P>

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<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> whether or not the debt securities will be secured or unsecured, and the terms of any secured debt; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the terms of the subordination of any series of subordinated debt; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the place where payments will be payable; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> restrictions on transfer, sale or other assignment, if any; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our right, if any, to defer payment of interest and the maximum length of any such deferral period; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the date, if any, after which, the conditions upon which, and the price at which, we may, at our option, redeem the series of debt securities
pursuant to any optional or provisional redemption provisions and the terms of those redemption provisions; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the date, if any, on which, and the price at which we are obligated, pursuant to any mandatory sinking fund or analogous fund provisions or
otherwise, to redeem, or at the holder's option, to purchase, the series of debt securities and the currency or currency unit in which the debt securities are payable; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> whether the indenture will restrict our ability or the ability of our subsidiary to:</FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> incur additional indebtedness; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> issue additional securities; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> create liens; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> pay dividends or make distributions in respect of our capital stock or the capital stock of our subsidiary; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> redeem capital stock; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> place restrictions on our subsidiary's ability to pay dividends, make distributions or transfer assets; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> make investments or other restricted payments; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> sell or otherwise dispose of assets; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> enter into sale-leaseback transactions; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> engage in transactions with stockholders or affiliates; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> issue or sell stock of our subsidiary; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> effect a consolidation or merger; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> whether the indenture will require us to maintain any interest coverage, fixed charge, cash flow-based, asset-based or other financial ratios; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> a discussion of certain material or special United States federal income tax considerations applicable to the debt securities; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> information describing any book-entry features; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> provisions for a sinking fund purchase or other analogous fund, if any; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the applicability of the provisions in the indenture on discharge; </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>16</FONT></P>

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<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> whether the debt securities are to be offered at a price such that they will be deemed to be offered at an "original issue discount" as defined
in paragraph&nbsp;(a) of Section&nbsp;1273 of the Internal Revenue Code of 1986, as amended; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the denominations in which we will issue the series of debt securities, if other than denominations of $1,000 and any integral multiple
thereof; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the currency of payment of debt securities if other than U.S. dollars and the manner of determining the equivalent amount in U.S. dollars; and </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any other specific terms, preferences, rights or limitations of, or restrictions on, the debt securities, including any additional events of
default or covenants provided with respect to the debt securities, and any terms that may be required by us or advisable under applicable laws or regulations or advisable in connection with the
marketing of the debt securities. </FONT></DD></DL>
</UL>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Conversion or Exchange Rights  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We will set forth in the applicable prospectus supplement or free writing prospectus the terms on which a series of debt securities may be
convertible into or exchangeable for our common stock, our preferred stock or other securities (including securities of a third-party). We will include provisions as to whether conversion or exchange
is mandatory, at the option of the holder or at our option. We may include provisions pursuant to which the number of shares of our common stock, our preferred stock or other securities (including
securities of a third-party) that the holders of the series of debt securities receive would be subject to adjustment. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Consolidation, Merger or Sale  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless we provide otherwise in the prospectus supplement or free writing prospectus applicable to a particular series of debt securities, the
indentures will not contain any covenant that restricts our ability to merge or consolidate, or sell, convey, transfer or otherwise dispose of all or substantially all of our assets. However, any
successor to or acquirer of such assets must
assume all of our obligations under the indentures or the debt securities, as appropriate. If the debt securities are convertible into or exchangeable for other securities of ours or securities of
other entities, the person with whom we consolidate or merge or to whom we sell all of our property must make provisions for the conversion of the debt securities into securities that the holders of
the debt securities would have received if they had converted the debt securities before the consolidation, merger or sale. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Events of Default Under the Indenture  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless we provide otherwise in the prospectus supplement or free writing prospectus applicable to a particular series of debt securities, the
following are events of default under the indentures with respect to any series of debt securities that we may issue:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> if we fail to pay interest when due and payable and our failure continues for 90&nbsp;days and the time for payment has not been extended; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> if we fail to pay the principal, premium or sinking fund payment, if any, when due and payable at maturity, upon redemption or repurchase or
otherwise, and the time for payment has not been extended; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> if we fail to observe or perform any other covenant contained in the debt securities or the indentures, other than a covenant specifically
relating to another series of debt securities, and our failure continues for 90&nbsp;days after we receive notice from the trustee or holders of at least 25% in aggregate principal amount of the
outstanding debt securities of the applicable series; and </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>17</FONT></P>

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<UL>
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<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> if specified events of bankruptcy, insolvency or reorganization occur. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will describe in each applicable prospectus supplement or free writing prospectus any additional events of default relating to the relevant series of debt securities. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
an event of default with respect to debt securities of any series occurs and is continuing, other than an event of default specified in the last bullet point above, the trustee or the
holders of at least 25% in aggregate principal amount of the outstanding debt securities of that series, by notice to us in writing, and to the trustee if notice is given by such holders, may declare
the unpaid principal, premium, if any, and accrued interest, if any, due and payable immediately. If an event of default specified in the last bullet point above occurs with respect to us, the unpaid
principal, premium, if any, and accrued interest, if any, of each issue of debt securities then outstanding shall be due and payable without any notice or other action on the part of the trustee or
any holder. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
holders of a majority in principal amount of the outstanding debt securities of an affected series may waive any default or event of default with respect to the series and its
consequences, except defaults or events of default regarding payment of principal, premium, if any, or interest, unless we have cured the default or event of default in accordance with the indenture.
Any waiver shall cure the default or event of default. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Subject
to the terms of the indentures, if an event of default under an indenture shall occur and be continuing, the trustee will be under no obligation to exercise any of its rights or
powers under such indenture at the request or direction of any of the holders of the applicable series of debt securities, unless such holders have offered the trustee reasonable indemnity or security
satisfactory to it against any loss, liability or expense. The holders of a majority in principal amount of the outstanding debt securities of any series will have the right to direct the time, method
and place of conducting any proceeding for any remedy available to the trustee, or exercising any trust or power conferred on the trustee, with respect to the debt securities of that series, provided
that:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the direction so given by the holder is not in conflict with any law or the applicable indenture; and </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> subject to its duties under the Trust Indenture Act, the trustee need not take any action that might involve it in personal liability or might
be unduly prejudicial to the holders not involved in the proceeding. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A
holder of the debt securities of any series will have the right to institute a proceeding under the indentures or to appoint a receiver or trustee, or to seek other remedies
if:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the holder has given written notice to the trustee of a continuing event of default with respect to that series; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the holders of at least 25% in aggregate principal amount of the outstanding debt securities of that series have made written request, and such
holders have offered reasonable indemnity to the trustee or security satisfactory to it against any loss, liability or expense or to be incurred in compliance with instituting the proceeding as
trustee; and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the trustee does not institute the proceeding, and does not receive from the holders of a majority in aggregate principal amount of the
outstanding debt securities of that series other conflicting directions within 90&nbsp;days after the notice, request and offer. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;These
limitations do not apply to a suit instituted by a holder of debt securities if we default in the payment of the principal, premium, if any, or interest on, the debt securities, or
other defaults that may be specified in the applicable prospectus supplement or free writing prospectus. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will periodically file statements with the trustee regarding our compliance with specified covenants in the indentures. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>18</FONT></P>

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Modification of Indenture; Waiver  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Subject to the terms of the indenture for any series of debt securities that we may issue, we and the trustee may change an indenture without
the consent of any holders with respect to the following specific matters:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to fix any ambiguity, defect or inconsistency in the indenture; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to comply with the provisions described above under "Description of Our Debt Securities&#151;Consolidation, Merger or Sale;" </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to comply with any requirements of the SEC in connection with the qualification of any indenture under the Trust Indenture Act; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to add to, delete from or revise the conditions, limitations, and restrictions on the authorized amount, terms, or purposes of issue,
authentication and delivery of debt securities, as set forth in the indenture; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to provide for the issuance of and establish the form and terms and conditions of the debt securities of any series as provided under
"Description of Our Debt Securities&#151;General," to establish the form of any certifications required to be furnished pursuant to the terms of the indenture or any series of debt securities,
or to add to the rights of the holders of any series of debt securities; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to evidence and provide for the acceptance of appointment hereunder by a successor trustee; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to provide for uncertificated debt securities and to make all appropriate changes for such purpose; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to add to our covenants such new covenants, restrictions, conditions or provisions for the benefit of the holders, to make the occurrence, or
the occurrence and the continuance, of a default in any such additional covenants, restrictions, conditions or provisions an event of default or to surrender any right or power conferred to us in the
indenture; or </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to change anything that does not materially adversely affect the interests of any holder of debt securities of any series. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
addition, under the indentures, the rights of holders of a series of debt securities may be changed by us and the trustee with the written consent of the holders of at least a
majority in aggregate principal amount of the outstanding debt securities of each series that is affected. However, subject to the terms of the indenture for any series of debt securities that we may
issue or as otherwise provided in the prospectus supplement or free writing prospectus applicable to a particular series of debt securities, we and the trustee may make the following changes only with
the consent of each holder of any outstanding debt securities affected:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> extending the stated maturity of the series of debt securities; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> reducing the principal amount, reducing the rate of or extending the time of payment of interest, or reducing any premium payable upon the
redemption or repurchase of any debt securities; or </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> reducing the percentage of debt securities, the holders of which are required to consent to any amendment, supplement, modification or waiver. </FONT></DD></DL>
</UL>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Discharge  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each indenture provides that, subject to the terms of the indenture and any limitation otherwise provided in the prospectus supplement or free
writing prospectus applicable to a particular series of </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>19</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>debt
securities, we can elect to be discharged from our obligations with respect to one or more series of debt securities, except for specified obligations, including obligations
to:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> register the transfer or exchange of debt securities of the series; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> replace stolen, lost or mutilated debt securities of the series; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> maintain paying agencies; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> hold monies for payment in trust; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> recover excess money held by the trustee; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> compensate and indemnify the trustee; and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> appoint any successor trustee. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
order to exercise our rights to be discharged, we must deposit with the trustee money or government obligations sufficient to pay all the principal of, any premium and interest on,
the debt securities of the series on the dates payments are due. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>



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Form, Exchange and Transfer  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We will issue the debt securities of each series only in fully registered form without coupons and, unless we otherwise specify in the
applicable prospectus supplement or free writing prospectus, in denominations of $1,000 and any integral multiple thereof. The indentures provide that we may issue debt securities of a series in
temporary or permanent global form and as book-entry securities that will be deposited with, or on behalf of, The Depository Trust Company or another depository named by us and identified in a
prospectus supplement or free writing prospectus with respect to that series. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;At
the option of the holder, subject to the terms of the indentures and the limitations applicable to global securities described in the applicable prospectus supplement or free writing
prospectus, the holder of the debt securities of any series can exchange the debt securities for other debt securities of the same series, in any authorized denomination and of like tenor and
aggregate principal amount. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Subject
to the terms of the indentures and the limitations applicable to global securities set forth in the applicable prospectus supplement or free writing prospectus, holders of the
debt securities may present the debt securities for exchange or for registration of transfer, duly endorsed or with the form of transfer endorsed thereon duly executed if so required by us or the
security registrar, at the office of the security registrar or at the office of any transfer agent designated by us for this purpose. Unless otherwise provided in the debt securities that the holder
presents for transfer or exchange, we will make no service charge for any registration of transfer or exchange, but we may require payment of any taxes or other governmental charges. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will name in the applicable prospectus supplement or free writing prospectus the security registrar, and any transfer agent in addition to the security registrar, that we initially
designate for any debt securities. We may at any time designate additional transfer agents or rescind the designation of any transfer agent or approve a change in the office through which any transfer
agent acts, except that we will be required to maintain a transfer agent in each place of payment for the debt securities of each series. If we elect to redeem the debt securities of any series, we
will not be required to:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> issue, register the transfer of, or exchange any debt securities of that series during a period beginning at the opening of business
15&nbsp;days before the day of mailing of a notice of redemption of any debt securities that may be selected for redemption and ending at the close of business on the day of the mailing; or </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> register the transfer of or exchange any debt securities so selected for redemption, in whole or in part, except the unredeemed portion of any
debt securities we are redeeming in part. </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>20</FONT></P>

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Information Concerning the Trustee  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The trustee, other than during the occurrence and continuance of an event of default under an indenture, undertakes to perform only those duties
as are specifically set forth in the
applicable indenture. Upon an event of default under an indenture, the trustee must use the same degree of care as a prudent person would exercise or use in the conduct of his or her own affairs. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Subject
to this provision, the trustee is under no obligation to exercise any of the powers given it by the indentures at the request of any holder of debt securities unless it is
offered reasonable security and indemnity against the costs, expenses and liabilities that it might incur. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Payment and Paying Agents  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless we otherwise indicate in the applicable prospectus supplement or free writing prospectus, we will make payment of the interest on any
debt securities on any interest payment date to the person in whose name the debt securities, or one or more predecessor securities, are registered at the close of business on the regular record date
for the interest. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will pay principal of and any premium and interest on the debt securities of a particular series at the office of the paying agents designated by us, except that unless we otherwise
indicate in the applicable prospectus supplement or free writing prospectus, we will make interest payments by check that we will mail to the holder or by wire transfer to certain holders. Unless we
otherwise indicate in the applicable prospectus supplement or free writing prospectus, we will designate the corporate trust office of the trustee as our sole paying agent for payments with respect to
debt securities of each series. We will name in the applicable prospectus supplement or free writing prospectus any other paying agents that we initially designate for the debt securities of a
particular series. We will maintain a paying agent in each place of payment for the debt securities of a particular series. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All
money we pay to a paying agent or the trustee for the payment of the principal of or any premium or interest on any debt securities that remains unclaimed at the end of two years
after such principal, premium or interest has become due and payable will be repaid to us, and the holder of the debt security thereafter may look only to us for payment thereof. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Governing Law  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The indentures and the debt securities will be governed by and construed in accordance with the laws of the State of New York, except to the
extent that the Trust Indenture Act is applicable. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>



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Ranking of Debt Securities  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The subordinated debt securities will be subordinate and junior in priority of payment to certain of our other indebtedness to the extent
described in a prospectus supplement or free writing prospectus. The subordinated indenture does not limit the amount of subordinated debt securities that we may issue. It also does not limit us from
issuing any other secured or unsecured debt. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
senior debt securities will rank equally in right of payment to all our other senior unsecured debt. The senior indenture does not limit the amount of senior debt securities that we
may issue. It also does not limit us from issuing any other secured or unsecured debt. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>21</FONT></P>

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</FONT> <FONT SIZE=2><A HREF="#bg48102a_main_toc">Table of Contents</A> </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A NAME="h9"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> DESCRIPTION OF UNITS  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We may issue units comprised of shares of common stock, shares of preferred stock, debt securities and warrants in any combination. We may issue
units in such amounts and in as many distinct series as we wish. This section outlines certain provisions of the units that we may issue. If we issue units, they will be issued under one or more unit
agreements to be entered into between us and a bank or other financial institution, as unit agent. The specific terms of any series of units offered will be described in the applicable prospectus
supplement or free writing prospectus. The specific terms of any series of units may differ from the general description of terms presented below. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will file as exhibits to the registration statement of which this prospectus is a part, or will incorporate by reference from reports that we file with the SEC, the form of unit
agreement that describes the terms of the series of units we are offering, and any supplemental agreements, before the
issuance of the related series of units. The following summaries of material terms and provisions of the units are subject to, and qualified in their entirety by reference to, all the provisions of
the unit agreement and any supplemental agreements applicable to a particular series of units. We urge you to read any prospectus supplement related to any series of units we may offer, as well as the
complete unit agreement and unit certificate that contain the terms of the units. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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General  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each unit that we may issue will be issued so that the holder of the unit is also the holder of each security included in the unit. Thus, the
holder of a unit will have the rights and obligations of a holder of each included security. The unit agreement under which a unit is issued may provide that the securities included in the unit may
not be held or transferred separately, at any time or at any time before a specified date. The applicable prospectus supplement may describe:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the designation and terms of the units and of the securities comprising the units, including whether and under what circumstances those
securities may be held or transferred separately; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any provisions of the governing unit agreement; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the price or prices at which such units will be issued; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the applicable United States federal income tax considerations relating to the units; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any provisions for the issuance, payment, settlement, transfer or exchange of the units or of the securities comprising the units; and </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any other terms of the units and of the securities comprising the units. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
provisions described in this section, as well as those described under "Description of Common Stock and Preferred Stock," "Description of Warrants" and "Description of Debt
Securities" will apply to the securities included in each unit, to the extent relevant and as may be updated in any prospectus supplements. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Issuance in Series  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We may issue units in such amounts and in as many distinct series as we wish. This section summarizes terms of the units that apply generally to
all series. Most of the financial and other specific terms of a particular series of units will be described in the applicable prospectus supplement. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Unit Agreements  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We will issue the units under one or more unit agreements to be entered into between us and a bank or other financial institution, as unit
agent. We may add, replace or terminate unit agents from </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>22</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>time
to time. We will identify the unit agreement under which each series of units will be issued and the unit agent under that agreement in the applicable prospectus supplement. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
following provisions will generally apply to all unit agreements unless otherwise stated in the applicable prospectus supplement: </FONT></P>

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Modification without Consent  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We and the applicable unit agent may amend any unit or unit agreement without the consent of any
holder:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to cure any ambiguity, including modifying any provisions of the governing unit agreement that differ from those described below; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to correct or supplement any defective or inconsistent provision; or </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> to make any other change that we believe is necessary or desirable and will not adversely affect the interests of the affected holders in any
material respect. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
do not need any approval to make changes that affect only units to be issued after the changes take effect. We may also make changes that do not adversely affect a particular unit in
any material respect, even if they adversely affect other units in a material respect. In those cases, we do not need to obtain the approval of the holder of the unaffected unit; we need only obtain
any required approvals from the holders of the affected units. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Modification with Consent  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We may not amend any particular unit or a unit agreement with respect to any particular unit unless we obtain the consent of the holder of that
unit, if the amendment would:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> impair any right of the holder to exercise or enforce any right under a security included in the unit if the terms of that security require the
consent of the holder to any changes that would impair the exercise or enforcement of that right; or </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> reduce the percentage of outstanding units or any series or class the consent of whose holders is required to amend that series or class, or
the applicable unit agreement with respect to that series or class, as described below. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any
other change to a particular unit agreement and the units issued under that agreement would require the following approval:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> If the change affects only the units of a particular series issued under that agreement, the change must be approved by the holders of a
majority of the outstanding units of that series; or </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> If the change affects the units of more than one series issued under that agreement, it must be approved by the holders of a majority of all
outstanding units of all series affected by the change, with the units of all the affected series voting together as one class for this purpose. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;These
provisions regarding changes with majority approval also apply to changes affecting any securities issued under a unit agreement, as the governing document. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
each case, the required approval must be given by written consent. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Unit Agreements Will Not Be Qualified under Trust Indenture Act  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No unit agreement will be qualified as an indenture, and no unit agent will be required to qualify as a trustee, under the Trust Indenture Act.
Therefore, holders of units issued under unit agreements will not have the protections of the Trust Indenture Act with respect to their units. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>23</FONT></P>

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Mergers and Similar Transactions Permitted; No Restrictive Covenants or Events of Default  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The unit agreements will not restrict our ability to merge or consolidate with, or sell our assets to, another corporation or other entity or to
engage in any other transactions. If at any time we merge or consolidate with, or sell our assets substantially as an entirety to, another corporation or other entity, the successor entity will
succeed to and assume our obligations under the unit agreements. We will then be relieved of any further obligation under these agreements. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
unit agreements will not include any restrictions on our ability to put liens on our assets, nor will they restrict our ability to sell our assets. The unit agreements also will not
provide for any events of default or remedies upon the occurrence of any events of default. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Governing Law  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless we provide otherwise in the applicable prospectus supplement, the unit agreements and the units will be governed by and construed in
accordance with the laws of the State of New York. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Form, Exchange and Transfer  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We will issue each unit in global (</FONT><FONT SIZE=2><I>i.e.</I></FONT><FONT SIZE=2>, book-entry) form only. Units in book-entry form will be
represented by a global security registered in the name of a depositary, which will be the holder of all the units represented by the global security. Those who own beneficial interests in a unit will
do so through participants in the depositary's system, and the rights of these indirect owners will be governed solely by the applicable procedures of the depositary and its participants. We will
describe book-entry securities, and other terms regarding the issuance and registration of the units in the applicable prospectus supplement. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each
unit and all securities comprising the unit will be issued in the same form. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
we issue any units in registered, non-global form, the following will apply to them. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
units will be issued in the denominations stated in the applicable prospectus supplement. Holders may exchange their units for units of smaller denominations or combined into fewer
units of larger denominations, as long as the total amount is not changed. </FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> Holders may exchange or transfer their units at the office of the unit agent. Holders may also replace lost, stolen, destroyed or mutilated
units at that office. We may appoint another entity to perform these functions or perform them ourselves. </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> Holders will not be required to pay a service charge to transfer or exchange their units, but they may be required to pay for any tax or other
governmental charge associated with the transfer or exchange. The transfer or exchange, and any replacement, will be made only if our transfer agent is satisfied with the holder's proof of legal
ownership. The transfer agent may also require an indemnity before replacing any units. </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> If we have the right to redeem, accelerate or settle any units before their maturity, and we exercise our right as to less than all those units
or other securities, we may block the exchange or transfer of those units during the period beginning 15&nbsp;days before the day we mail the notice of exercise and ending on the day of that
mailing, in order to freeze the list of holders to prepare the mailing. We may also refuse to register transfers of or exchange any unit selected for early settlement, except that we will continue to
permit transfers and exchanges of the unsettled portion of any unit being partially settled. We may also block the transfer or exchange of any unit in this manner if the unit includes securities that
are or may be selected for early settlement. </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>24</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Only
the depositary will be entitled to transfer or exchange a unit in global form, since it will be the sole holder of the unit. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Payments and Notices  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In making payments and giving notices with respect to our units, we will follow the procedures as described in the applicable prospectus
supplement. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>25</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A NAME="h10"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> SELLING SECURITYHOLDERS  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Selling securityholders are persons or entities that, directly or indirectly, have acquired or will from time to time acquire from us common
stock, preferred stock, warrants, debt securities or units, as applicable, in various private transactions. Such selling securityholders may be parties to registration rights agreements with us, or we
otherwise may have agreed or may agree in the future to register their securities for resale. The initial purchasers of our securities, as well as their transferees, pledgees, donees or successors,
all of whom we refer to as "selling securityholders," may from time to time offer and sell the securities pursuant to this prospectus and any applicable prospectus supplement. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
selling securityholders may offer for sale all or some portion of the securities that they hold. To the extent that any of the selling securityholders are broker or dealers, they are
deemed to be, under interpretations of the SEC, "underwriters" within the meaning of the Securities Act. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
applicable prospectus supplement will set forth the name of each of the selling securityholders and the number and classes of our securities beneficially owned by such selling
securityholders that are covered by such prospectus supplement. The applicable prospectus supplement will also disclose whether any of the selling securityholders has held any position or office with,
has been employed by or otherwise has had a material relationship with us during the three years prior to the date of the prospectus supplement. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>26</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A NAME="h11"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> PLAN OF DISTRIBUTION  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We, or selling securityholders, may sell the securities domestically or abroad to one or more underwriters for public offering and sale by them
or may sell the securities to investors directly or through dealers or agents, or through a combination of methods. Any underwriter, dealer or agent involved in the offer and sale of the securities
will be named in the applicable prospectus supplement. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Underwriters
may offer and sell the securities at: (i)&nbsp;a fixed price or prices, which may be changed, (ii)&nbsp;market prices prevailing at the time of sale, (iii)&nbsp;prices
related to the prevailing market prices at the time of sale or (iv)&nbsp;negotiated prices. We also may, from time to time, authorize underwriters acting as our agents to offer and sell the
securities upon the terms and conditions as are set forth in the applicable prospectus supplement. In connection with the sale of securities, underwriters may be deemed to have received compensation
from us in the form of underwriting discounts or commissions and may also receive commissions from purchasers of securities for whom they may act as agent. Underwriters may sell securities to or
through dealers, and the dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters and/or commissions from the purchasers for whom they may act as
agent. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any
underwriting compensation paid by us to underwriters, dealers or agents in connection with the offering of securities, and any discounts, concessions or commissions allowed by
underwriters to participating dealers, will be set forth in the applicable prospectus supplement. Dealers and agents participating in the distribution of the securities may be deemed to be
underwriters, and any discounts and commissions received by them and any profit realized by them on resale of the securities may be deemed to be underwriting discounts and commissions under the
Securities Act. Underwriters, dealers and agents may be entitled, under agreements entered into with us and our operating partnership, to indemnification against and contribution toward civil
liabilities, including liabilities under the Securities Act. We will describe any indemnification agreement in the applicable prospectus supplement. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless
we specify otherwise in the applicable prospectus supplement, any series of securities issued hereunder will be a new issue with no established trading market (other than the
common stock, which is listed on the Nasdaq Capital Market). If the Company sells any shares of the common stock pursuant to a prospectus supplement, such shares will be listed on the Nasdaq Capital
Market, subject to official notice of issuance. We may elect to list any other securities issued hereunder on any exchange, but we are not obligated to do so. Any underwriters or agents to or through
whom such securities are sold by us or our operating partnership for public offering and sale may make a market in such securities, but such underwriters or agents will not be obligated to do so and
may discontinue any market making at any time without notice. We cannot assure you as to the liquidity of the trading market for any such securities. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
indicated in the applicable prospectus supplement, we may authorize underwriters or other persons acting as our agents to solicit offers by institutions or other suitable purchasers
to purchase the securities from us at the public offering price set forth in the prospectus supplement, pursuant to delayed delivery contracts providing for payment and delivery on the date or dates
stated in the prospectus supplement. These purchasers may include, among others, commercial and savings banks, insurance companies, pension funds, investment companies and educational and charitable
institutions. Delayed delivery contracts will be subject to the condition that the purchase of the securities covered by the delayed delivery contracts will not at the time of delivery be prohibited
under the laws of any jurisdiction in the United States to which the purchaser is subject. The underwriters and agents will not have any responsibility with respect to the validity or performance of
these contracts. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To
facilitate the offering of the securities, certain persons participating in the offering may engage in transactions that stabilize, maintain, or otherwise affect the price of the
securities. This may include
over-allotments or short sales of the securities, which involves the sale by persons participating in the offering of more securities than we sold to them. In these circumstances, these persons would
cover the </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>27</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>over-allotments
or short positions by making purchases in the open market or by exercising their over-allotment option. In addition, these persons may stabilize or maintain the price of the securities
by bidding for or purchasing securities in the open market or by imposing penalty bids, whereby selling concessions allowed to dealers participating in the offering may be reclaimed if securities sold
by them are repurchased in connection with stabilization transactions. The effect of these transactions may be to stabilize or maintain the market price of the securities at a level above that which
might otherwise prevail in the open market. These transactions may occur on the Nasdaq Capital Market or any other market where our securities may be traded, and may be discontinued at any time. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
underwriters, dealers and agents and their affiliates may be customers of, engage in transactions with and perform services for us and our operating partnership in the ordinary
course of business. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A NAME="h12"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> LEGAL MATTERS  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The validity of the securities being offered by this prospectus will be passed upon by Goodwin Procter&nbsp;LLP, Boston, Massachusetts. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A NAME="h13"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> EXPERTS  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The consolidated financial statements of Plug Power&nbsp;Inc. and subsidiaries as of December&nbsp;31, 2018 and 2017, and for each of the
years in the three-year period ended December&nbsp;31, 2018, and management's assessment of the effectiveness of internal control over financial reporting as of December&nbsp;31, 2018, have been
incorporated by reference herein in reliance upon the report of KPMG&nbsp;LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as
experts in accounting and auditing. The audit report covering the 2018
consolidated financial statements refers to a change to the accounting for leases due to the adoption of Accounting Standards Codification Topic 842, </FONT> <FONT SIZE=2><I>Leases</I></FONT><FONT SIZE=2>. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A NAME="h14"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> WHERE YOU CAN FIND ADDITIONAL INFORMATION  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We file annual, quarterly and special reports, proxy statements and other information with the SEC. The SEC maintains a website that contains
reports, proxy and information statements and other information regarding registrants that file electronically with the SEC at www.sec.gov. In addition, we maintain a website that contains information
about us at www.plugpower.com. The information found on, or otherwise accessible through, this website is not incorporated into, and does not form&nbsp;a part of, this prospectus or any other report
or document we file with or furnish to the SEC. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have filed with the SEC a registration statement on Form&nbsp;S-3, of which this prospectus is a part, including exhibits, schedules and amendments filed with, or incorporated by
reference in, this registration statement, under the Securities Act, with respect to the securities registered hereby. This prospectus and any accompanying prospectus supplement do not contain all of
the information set forth in the registration statement and exhibits and schedules to the registration statement. For further information with respect to our Company and the securities registered
hereby, reference is made to the registration statement, including the exhibits to the registration statement. Statements contained in this prospectus and any accompanying prospectus supplement as to
the contents of any contract or other document referred to, or incorporated by reference in, this prospectus and any accompanying prospectus supplement are not necessarily complete and, where that
contract is an exhibit to the registration statement, each statement is qualified in all respects by the exhibit to which the reference relates. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>28</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A NAME="h15"></A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> INCORPORATION OF CERTAIN INFORMATION BY REFERENCE  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The SEC allows us to "incorporate by reference" the information we file with it, which means that we can disclose important information to you
by referring you to those documents instead of having to repeat the information in this prospectus. The information incorporated by reference is considered to be part of this prospectus, and later
information that we file with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below that we have filed with the
SEC:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>  <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837019001929/plug-20181231x10k.htm">our Annual Report on
Form&nbsp;10-K for the year ended December&nbsp;31, 2018, filed with the SEC on March&nbsp;13, 2019;</A></FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our Quarterly Reports on Form&nbsp;10-Q for the quarters ended March&nbsp;31, 2019, June&nbsp;30, 2019 and September&nbsp;30, 2019,
filed with the SEC on <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837019004508/plug-20190331x10q.htm">May&nbsp;8, 2019</A>,
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837019007894/plug-20190630x10q.htm">August&nbsp;9, 2019</A> and
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837019010607/plug-20190930x10q.htm">November&nbsp;8, 2019</A>, respectively; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>  <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000104746919001996/a2238347zdef14a.htm">our Definitive Proxy Statement on
Schedule&nbsp;14A filed with the SEC on April&nbsp;5, 2019</A> (solely to the extent specifically incorporated by reference into the
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000155837019001929/plug-20181231x10k.htm">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31,
2018</A>); </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our Current Report on Form&nbsp;8-K filed with the SEC on
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465919016359/a19-6870_18k.htm">March&nbsp;20, 2019</A>,
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465919019559/a19-7776_18k.htm">April&nbsp;3, 2019</A> (except for information contained therein which is furnished
rather than filed), <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465919029757/a19-10007_18k.htm">May&nbsp;15, 2019</A>,
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000141057819000300/a19-11304_18k.htm">June&nbsp;10, 2019</A>,
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465919036826/a19-11872_18k.htm">June&nbsp;21, 2019</A>,
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465919049177/a19-18405_18k.htm">September&nbsp;9, 2019</A> and
<A HREF="http://www.sec.gov/Archives/edgar/data/1093691/000110465919068952/tm1923991_1-8k.htm">December&nbsp;2, 2019</A>; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>  <A HREF="http://www.sec.gov/Archives/edgar/data/1093691/0000927016-99-003354-index.html">the section entitled "Description of
Registrant's Securities to be Registered" contained in our Registration Statement on Form&nbsp;8-A, filed pursuant to Section&nbsp;12(b) of the Exchange Act, on October&nbsp;1, 1999;
and</A></FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> all documents filed by us with the SEC pursuant to Sections&nbsp;13(a), 13(c), 14 or 15(d) of the Exchange Act on or after the date of this
prospectus and prior to the termination of the offering of the underlying securities (excluding any portions of such documents that are deemed "furnished" to the SEC pursuant to applicable rules and
regulations). </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will furnish without charge to each person, including any beneficial owner, to whom a prospectus is delivered, on written or oral request of such person, a copy of any or all of the
documents incorporated by reference in this prospectus (not including exhibits to such documents, unless such exhibits are specifically incorporated by reference in this prospectus or into such
documents). You should direct any requests for documents to: </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>Plug
Power&nbsp;Inc.<BR>
968 Albany-Shaker Road<BR>
Latham, New York, 12110<BR>
Attention: General Counsel<BR>
Telephone: (518)&nbsp;782-7700 </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>29</FONT></P>

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</FONT> <FONT SIZE=2><A HREF="#bg48101a_main_toc">Table of Contents</A> </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;<BR></FONT></P>


<P style="font-family:times;"><FONT SIZE=2><div
style="width:100%;border-top:solid #000000 3.0pt;padding:0in 0in 0in 0in;font-size:3.0pt;"></div>
<div style="width:100%;border-top:solid #000000 1.0pt;padding:0in 0in 0in 0in;font-size:4.0pt;"></div> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=4><B>3,458,254 Shares  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=5><B>Plug Power&nbsp;Inc.  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=4><B>Common Stock  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=3><B>PROSPECTUS  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>August&nbsp;21, 2020 </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><div
style="width:100%;border-top:solid #000000 1.0pt;padding:0in 0in 0in 0in;font-size:3.0pt;"></div>
<div style="width:100%;border-top:solid #000000 3.0pt;padding:0in 0in 0in 0in;font-size:4.0pt;"></div> </FONT></P>

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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
