<SEC-DOCUMENT>0001104659-21-142362.txt : 20211122
<SEC-HEADER>0001104659-21-142362.hdr.sgml : 20211122
<ACCEPTANCE-DATETIME>20211122132127
ACCESSION NUMBER:		0001104659-21-142362
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20211122
DATE AS OF CHANGE:		20211122
GROUP MEMBERS:		BREAKTHROUGH ENERGY VENTURES, LLC

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ESS Tech, Inc.
		CENTRAL INDEX KEY:			0001819438
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-91696
		FILM NUMBER:		211431239

	BUSINESS ADDRESS:	
		STREET 1:		26440 SW PARKWAY AVE.
		STREET 2:		BLDG. 83
		CITY:			WILSONVILLE
		STATE:			OR
		ZIP:			97070
		BUSINESS PHONE:		(855) 423-9920

	MAIL ADDRESS:	
		STREET 1:		26440 SW PARKWAY AVE.
		STREET 2:		BLDG. 83
		CITY:			WILSONVILLE
		STATE:			OR
		ZIP:			97070

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ACON S2 Acquisition Corp.
		DATE OF NAME CHANGE:	20200728

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BREAKTHROUGH ENERGY INVESTMENTS LLC
		CENTRAL INDEX KEY:			0001888406
		IRS NUMBER:				852618609
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		250 SUMMER STREET, 4TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		857-327-8780

	MAIL ADDRESS:	
		STREET 1:		250 SUMMER STREET, 4TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>tm2132816d1_sc13da.htm
<DESCRIPTION>SC 13D/A
<TEXT>
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<P STYLE="text-align: center; margin-top: 0; margin-bottom: 0">&nbsp;</P>

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<P STYLE="text-align: center; margin-top: 0; margin-bottom: 0"></P>

<P STYLE="text-align: center; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 18pt"><B>UNITED
STATES<BR>
SECURITIES AND EXCHANGE COMMISSION<BR>
</B></FONT><B>Washington, D.C. 20549</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 18pt"><B>SCHEDULE
13D/A<BR>
</B></FONT><B>(Rule&nbsp;13d-101)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>INFORMATION TO BE INCLUDED IN STATEMENTS FILED
PURSUANT<BR>
TO &sect; 240.13d-1(a)&nbsp;AND AMENDMENTS THERETO FILED<BR>
PURSUANT TO &sect; 240.13d-2(a)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(Amendment
No.&nbsp;1)*</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 18pt"><B>ESS
Tech,&nbsp;Inc.<BR>
</B></FONT><B>(Name of Issuer)</B></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif"><B>Common
Stock, $0.0001 par value per share<BR>
</B></FONT><B>(Title of Class&nbsp;of Securities)</B></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif"><B>26916J106<BR>
</B></FONT><B>(CUSIP Number)</B></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Breakthrough Energy Ventures,
LLC</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>c/o Breakthrough Energy
Investments, LLC</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>250 Summer Street, 4<SUP>th
</SUP>Floor</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Boston, MA 02210</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif"><B>857-327-8780<BR>
</B></FONT><B>(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)</B></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif"><B>November&nbsp;9,
2021<BR>
</B></FONT><B>(Date of Event Which Requires the Filing of this Statement)</B></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D,
and is filing this schedule because of Rule&nbsp;13d-1(e), 13d-1(f)&nbsp;or 13d-1(g), check the following box: </FONT><FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif"><I>Note.
</I></FONT>Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. <I>See
</I>Rule&nbsp;13d-7(b)&nbsp;for other parties to whom copies are to be sent.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1.4pt"></TD><TD STYLE="width: 17.3pt">*</TD><TD>The remainder of this cover page&nbsp;shall be filled out for a reporting person&rsquo;s initial filing on this form with respect
to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in
a prior cover page.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="text-align: left; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The information required on the remainder of this
cover page&nbsp;shall not be deemed to be &ldquo;filed&rdquo; for the purpose of Section&nbsp;18 of the Securities Exchange Act of 1934
(&ldquo;Act&rdquo;) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of
the Act (however, <I>see</I> the Notes).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 50%; text-align: left">CUSIP No. 26916J106</TD><TD STYLE="text-align: right; width: 50%">Page 2 of  7 Pages</TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR>
    <TD STYLE="text-align: center; padding-top: 2pt; border-top: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1 </FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border: black 1pt solid; vertical-align: bottom; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Names of reporting persons</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Breakthrough Energy Ventures, LLC</P></TD></TR>
  <TR>
    <TD STYLE="border-bottom: black 1pt solid; border-left: black 1pt solid; text-align: center; padding-top: 2pt; vertical-align: top; font-size: 10pt; padding-bottom: 5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2</FONT></TD>
    <TD COLSPAN="3" STYLE="border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-left: 1pt; padding-top: 2pt; vertical-align: bottom; padding-bottom: 5pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check the appropriate box if a member of a group</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)&nbsp;
</FONT><FONT STYLE="font-family: Wingdings">&#168;</FONT> (b)&nbsp; <FONT STYLE="font-family: Wingdings">&#168;</FONT></P></TD></TR>
  <TR>
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: bottom; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">SEC use only</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: bottom; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Source of funds</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">WC</P></TD></TR>
  <TR>
    <TD STYLE="border-bottom: black 1pt solid; border-left: black 1pt solid; text-align: center; padding-top: 2pt; vertical-align: top; font-size: 10pt; padding-bottom: 5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></TD>
    <TD COLSPAN="3" STYLE="border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-left: 1pt; padding-top: 2pt; vertical-align: bottom; font-size: 10pt; padding-bottom: 5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Check if disclosure of legal proceedings is required pursuant to Item 2(d)&nbsp;or 2(e)&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">6</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: bottom; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Citizenship or place of organization</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">United States</P></TD></TR>
  <TR>
    <TD COLSPAN="2" ROWSPAN="4" STYLE="border-left: black 1pt solid; font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Number of <BR>
shares <BR>
beneficially <BR>
owned by <BR>
each <BR>
reporting <BR>
person <BR>
with</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid; padding-top: 2pt; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; text-align: center; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">7</FONT></TD>
    <TD STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: top; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Sole Voting Power</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">0</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: black 1pt solid; padding-top: 2pt; border-left: black 1pt solid; font-size: 10pt; text-align: center; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">8</FONT></TD>
    <TD STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Shared Voting Power</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">18,558,721(1)</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: black 1pt solid; padding-top: 2pt; border-left: black 1pt solid; font-size: 10pt; text-align: center; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">9</FONT></TD>
    <TD STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Sole Dispositive Power</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">0</P></TD></TR>
  <TR>
    <TD STYLE="border-left: black 1pt solid; padding-top: 2pt; vertical-align: top; font-size: 10pt; text-align: center; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10</FONT></TD>
    <TD STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-left: black 1pt solid; vertical-align: bottom; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Shared Dispositive Power</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">18,558,721(1)</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; padding-top: 2pt; border-top: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">11</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Aggregate Amount Beneficially Owned by Each Reporting Person</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">18,558,721(1)</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">12</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check if the Aggregate Amount in Row (11) Excludes Certain Shares</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">13</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Percent of Class&nbsp;Represented by Amount in Row (11)</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">12.2</FONT>%
    (2)</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">14</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Type of Reporting Person</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">OO</P></TD></TR>
  <TR>
    <TD STYLE="text-align: center; width: 5%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 10%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; width: 5%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 80%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(1)&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Includes (a)&nbsp;2,500,751 shares of Common Stock, par value $0.0001 per share (&ldquo;Common Stock&rdquo;)
of ESS Tech,&nbsp;Inc. (the &ldquo;Issuer&rdquo;) acquired by the reporting persons pursuant to an &quot;earnout&quot; provision of the
Agreement and Plan of Merger, dated as of May&nbsp;6, 2021 (the &quot;Merger Agreement&quot;), by and among ACON S2 Acquisition Corp,
SCharge Merger Sub,&nbsp;Inc., and the Issuer and (b)&nbsp;20,096 shares of Common Stock acquired by the reporting persons because, following
the closing of the merger, the Issuer determined that aggregate Transaction Expenses (as defined in the Merger Agreement) were lower
than had been estimated at the time of closing. Pursuant to the Merger Agreement, this lower amount of Transaction Expenses resulted
in an Expense Shortfall (as defined therein), which increased the Adjusted Equity Value (as defined therein).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(2)&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Calculated
based upon 151,569,680 shares of Common Stock outstanding as of November&nbsp;2, 2021, as reported on the Issuer&rsquo;s Form&nbsp;S-1
registration statement, filed with the Securities and Exchange Commission on November&nbsp;3, 2021.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 50%; text-align: left">CUSIP No. 26916J106</TD><TD STYLE="text-align: right; width: 50%">Page 3  of 7  Pages</TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR>
    <TD STYLE="text-align: center; padding-top: 2pt; border-top: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1 </FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border: black 1pt solid; vertical-align: bottom; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Names of reporting persons</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Breakthrough Energy Investments, LLC</P></TD></TR>
  <TR>
    <TD STYLE="border-bottom: black 1pt solid; text-align: center; padding-top: 2pt; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; padding-bottom: 5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2</FONT></TD>
    <TD COLSPAN="3" STYLE="border-right: black 1pt solid; padding-left: 1pt; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: bottom; padding-bottom: 5pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check the appropriate box if a member of a group</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)&nbsp;
    </FONT><FONT STYLE="font-family: Times New Roman, Times, Serif"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT> (b)&nbsp; <FONT STYLE="font-family: Times New Roman, Times, Serif"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></P></TD></TR>
  <TR>
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: bottom; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">SEC use only</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: bottom; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Source of funds</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">WC</P></TD></TR>
  <TR>
    <TD STYLE="border-bottom: black 1pt solid; text-align: center; padding-top: 2pt; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; padding-bottom: 5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></TD>
    <TD COLSPAN="3" STYLE="border-right: black 1pt solid; padding-left: 1pt; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: bottom; font-size: 10pt; padding-bottom: 5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Check if disclosure of legal proceedings is required pursuant to Item 2(d)&nbsp;or 2(e)&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">6</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: bottom; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Citizenship or place of organization</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">United States</P></TD></TR>
  <TR>
    <TD COLSPAN="2" ROWSPAN="4" STYLE="border-left: black 1pt solid; font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Number of <BR>
shares <BR>
beneficially <BR>
owned by <BR>
each <BR>
reporting <BR>
person <BR>
with</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid; padding-top: 2pt; border-left: black 1pt solid; vertical-align: top; font-size: 10pt; text-align: center; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">7</FONT></TD>
    <TD STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; vertical-align: top; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Sole Voting Power</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">0</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: black 1pt solid; padding-top: 2pt; border-left: black 1pt solid; font-size: 10pt; text-align: center; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">8</FONT></TD>
    <TD STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Shared Voting Power</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">18,558,721(1)</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: black 1pt solid; padding-top: 2pt; border-left: black 1pt solid; font-size: 10pt; text-align: center; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">9</FONT></TD>
    <TD STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Sole Dispositive Power</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">0</P></TD></TR>
  <TR>
    <TD STYLE="border-left: black 1pt solid; padding-top: 2pt; vertical-align: top; font-size: 10pt; text-align: center; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10</FONT></TD>
    <TD STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-left: black 1pt solid; vertical-align: bottom; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Shared Dispositive Power</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">18,558,721(1)</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; padding-top: 2pt; border-top: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">11</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Aggregate Amount Beneficially Owned by Each Reporting Person</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">18,558,721(1)</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">12</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check if the Aggregate Amount in Row (11) Excludes Certain Shares</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">13</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Percent of Class&nbsp;Represented by Amount in Row (11)</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">12.2</FONT>%
    (2)</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; padding-top: 2pt; border-bottom: black 1pt solid; border-left: black 1pt solid; font-size: 10pt; padding-bottom: 2pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">14</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-left: 1pt; padding-top: 2pt; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-bottom: 2pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Type of Reporting Person</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">OO</P></TD></TR>
  <TR>
    <TD STYLE="text-align: center; width: 5%">&nbsp;</TD>
    <TD STYLE="width: 10%">&nbsp;</TD>
    <TD STYLE="text-align: center; width: 5%">&nbsp;</TD>
    <TD STYLE="width: 80%">&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(1)&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Includes
(a)&nbsp;2,500,751 shares of Common Stock acquired by the reporting persons pursuant to an &quot;earnout&quot; provision of the Merger
Agreement and (b)&nbsp;20,096 shares of Common Stock acquired by the reporting persons because, following the closing of the merger, the
Issuer determined that aggregate Transaction Expenses (as defined in the Merger Agreement) were lower than had been estimated at the time
of closing. Pursuant to the Merger Agreement, this lower amount of Transaction Expenses resulted in an Expense Shortfall (as defined therein),
which increased the Adjusted Equity Value (as defined therein).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(2)&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Calculated
based upon 151,569,680 shares of Common Stock outstanding as of November&nbsp;2, 2021.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<TD STYLE="width: 50%; text-align: left">CUSIP No. 26916J106</TD><TD STYLE="text-align: right; width: 50%">Page 4 of 7 Pages</TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0%"></TD><TD STYLE="width: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Item 1.</B></FONT></TD><TD><B>Security and Issuer</B>.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This statement on Schedule 13D relates to the Common
Stock of ESS Tech,&nbsp;Inc., a Delaware corporation. The address of the principal executive offices of the Issuer is 26440 SW Parkway
Ave., Bldg. 83 Wilsonville, Oregon 97070.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0%"></TD><TD STYLE="width: 0.5in"><B>Item 2.</B></TD><TD><B>Identity and Background.</B></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)(b)(c)(f)&nbsp;This
statement is being filed by </FONT>Breakthrough Energy Ventures, LLC, a Delaware limited liability company and Breakthrough Energy Investments,
LLC, a Delaware limited liability company (the &ldquo;Reporting Persons&rdquo;). The principal business address of each of the Reporting
Persons is c/o Breakthrough Energy Investments, LLC, 250 Summer Street, 4th Floor, Boston, MA 02210.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">(d)(e)&nbsp;In the last five years, the Reporting
Person has not been convicted in a criminal proceeding (excluding traffic violations and similar misdemeanors) nor has he been a party
to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result was or is subject to a judgment,
decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws
or finding any violation with respect to such laws.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0%"></TD><TD STYLE="width: 0.5in"><B>Item 3.</B></TD><TD><B>Source and Amount of Funds or Other Consideration.</B></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The source of funds is working capital of the Reporting
Persons.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0%"></TD><TD STYLE="width: 0.5in"><B>Item 4.</B></TD><TD><B>Purpose of Transaction.</B></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The shares of Common Stock covered by this Schedule
13D were acquired in the ordinary course of business solely for investment purposes. However, Kyle Teamey, an employee of Breakthrough
Energy Investments, LLC, is a member of the Board of Directors of the Issuer and, as such, the Reporting Persons may be deemed to have
the intent to influence the control of the Issuer. The Reporting Persons disclaim any such intent to influence control of the Issuer.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0%"></TD><TD STYLE="width: 0.5in"><B>Item 5.</B></TD><TD><B>Interest in Securities of the Issuer.</B></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">(a)&nbsp;and (b)&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;The
responses of the Reporting Persons to rows (7)&nbsp;through (13) of the cover pages&nbsp;are incorporated herein by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">As of the date hereof, the shares of Common Stock
are held directly by Breakthrough Energy Ventures, LLC. Breakthrough Energy Investments, LLC serves as manager of Breakthrough Energy
Ventures, LLC. By reason of such relationship, Breakthrough Energy Investments, LLC may be deemed to share voting and dispositive power
over the Common Stock listed as beneficially owned by Breakthrough Energy Ventures, LLC. Breakthrough Energy Investments, LLC disclaims
beneficial ownership of all such shares, except to the extent of its pecuniary interest.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">(c)&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Other
than as discussed in this statement, during the past sixty days prior to the date of this statement, the Reporting Persons have not acquired
any shares of Common Stock.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(d)&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;No
other person is known to have the right to receive or the power to direct the receipt of dividends from, or the</FONT> proceeds from the
sale of shares of Common Stock of the Issuer owned by the Reporting Persons.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">(e)&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Not
applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<TD STYLE="width: 50%; text-align: left">CUSIP No. 26916J106</TD><TD STYLE="text-align: right; width: 50%">Page 5 of  7 Pages</TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0%"></TD><TD STYLE="width: 0.5in"><B>Item 6.</B></TD><TD><B>Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.</B></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On October 8, 2021, Breakthrough Energy Ventures,
LLC entered into a registration rights agreement (the &ldquo;Registration Rights Agreement&rdquo;) with the Issuer providing, among other
things, certain customary registration rights, demand rights and piggyback rights with respect to the Common Stock of the Issuer held
by Breakthrough Energy Ventures, LLC. The foregoing description of the Registration Rights Agreement does not purport to be complete and
is qualified in its entirety by the full text of the Registration Rights Agreement, a copy of which is attached hereto as Exhibit&nbsp;1
and incorporated herein by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On May&nbsp;6, 2021, Breakthrough Energy Ventures,
LLC, the Issuer and SB Energy Global Holdings One Ltd. (&ldquo;SBE&rdquo;) entered into a stockholder&rsquo;s agreement pursuant (the
 &ldquo;Stockholder&rsquo;s Agreement&rdquo;) to which the parties agreed, among other things, (i)&nbsp;that each of SBE and Breakthrough
Energy Ventures, LLC would have one designee on the Issuer&rsquo;s initial board of directors, and (ii)&nbsp;that each of SBE and Breakthrough
Energy Ventures, LLC will continue to be entitled to designate a member of the Issuer&rsquo;s board of directors until it beneficially
owns less than five percent of the issued and outstanding voting stock of the Issuer. The foregoing description of the Stockholders&rsquo;
Agreement does not purport to be complete and is qualified in its entirety by the full text of the Stockholders&rsquo; Agreement, a copy
of which is attached hereto as Exhibit&nbsp;2 and incorporated herein by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; margin-top: 0pt; margin-right: 0; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; margin-top: 0pt; margin-right: 0; margin-bottom: 0pt"></P>

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<TD STYLE="width: 50%; text-align: left">CUSIP No. 26916J106</TD><TD STYLE="text-align: right; width: 50%">Page 6  of  7 Pages</TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; margin-top: 0pt; margin-right: 0; margin-bottom: 0pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0%"></TD><TD STYLE="width: 0.5in"><B>Item 7.</B></TD><TD><B>Materials to be Filed as Exhibits.</B></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Exhibit&nbsp;1&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Form&nbsp;of Registration
Rights Agreement (incorporated by reference to Exhibit&nbsp;10.3 of the Current Report on Form&nbsp;8-K filed by ESS Tech,&nbsp;Inc. on
May&nbsp;7. 2021).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Exhibit&nbsp;2&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Form&nbsp;of Stockholders&rsquo;
Agreement (incorporated by reference to Exhibit&nbsp;10.5 of the Current Report on Form&nbsp;8-K filed by ESS Tech,&nbsp;Inc. on May&nbsp;7.
2021).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><A HREF="tm2132816d1_ex3.htm">Exhibit&nbsp;3&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Joint Filing Agreement.</A></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

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<TD STYLE="width: 50%; text-align: left">CUSIP No. 26916J106</TD><TD STYLE="text-align: right; width: 50%">Page 7  of 7  Pages</TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SIGNATURES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">After reasonable inquiry and to the best of my
knowledge and belief,&nbsp;I certify that the information set forth in this statement is true, complete and correct.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Date:&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;November&nbsp;22, 2021</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">BREAKTHROUGH ENERGY VENTURES, LLC</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">By: BREAKTHROUGH ENERGY INVESTMENTS, LLC, its manager</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 3%"><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; width: 47%"><FONT STYLE="font-size: 10pt">/s/ Christian Garcia</FONT></TD>
    <TD STYLE="width: 50%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Name: Christian Garcia</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Title: Authorized Signatory</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  </TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">BREAKTHROUGH ENERGY INVESTMENTS, LLC</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 3%"><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; width: 47%"><FONT STYLE="font-size: 10pt">/s/ Christian Garcia</FONT></TD>
    <TD STYLE="width: 50%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Name: Christian Garcia</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Title: Authorized Signatory</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  </TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>&nbsp;</B></P>

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<TYPE>EX-3
<SEQUENCE>2
<FILENAME>tm2132816d1_ex3.htm
<DESCRIPTION>EXHIBIT 3
<TEXT>
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<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>EXHIBIT&nbsp;3</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">JOINT FILING AGREEMENT</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">THIS JOINT FILING AGREEMENT is entered into as of November&nbsp;22,
2021, by and among the parties signatories hereto. The undersigned hereby agree that the Statement on Schedule 13D with respect to the
shares of Common Stock of ESS Tech,&nbsp;Inc. is, and any amendment thereafter signed by each of the undersigned shall be, filed on behalf
of each undersigned pursuant to and in accordance with the provisions of 13d-1(k)&nbsp;under the Securities Exchange Act of 1934, as amended.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%">
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">BREAKTHROUGH ENERGY VENTURES, LLC</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">By: BREAKTHROUGH ENERGY INVESTMENTS,
    LLC, its manager</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 3%"><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; width: 47%"><FONT STYLE="font-size: 10pt">/s/ Christian Garcia</FONT></TD>
    <TD STYLE="width: 50%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Name: Christian Garcia</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Title: Authorized Signatory</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">BREAKTHROUGH ENERGY INVESTMENTS, LLC</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">/s/ Christian Garcia</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Name: Christian Garcia</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Title: Authorized Signatory</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  </TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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