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<ACCESSION-NUMBER>0001140361-18-018727
<TYPE>6-K
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20180417
<FILING-DATE>20180417
<DATE-OF-FILING-DATE-CHANGE>20180417
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>Atlantica Yield plc
<CIK>0001601072
<ASSIGNED-SIC>4911
<IRS-NUMBER>000000000
<STATE-OF-INCORPORATION>X0
<FISCAL-YEAR-END>1231
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<FILING-VALUES>
<FORM-TYPE>6-K
<ACT>34
<FILE-NUMBER>001-36487
<FILM-NUMBER>18758224
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<BUSINESS-ADDRESS>
<STREET1>GREAT WEST HOUSE, GW1, 17TH FLOOR
<STREET2>GREAT WEST ROAD
<CITY>BRENTFORD
<STATE>X0
<ZIP>TW8 9DF
<PHONE>44 20 7098 4384
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>GREAT WEST HOUSE, GW1, 17TH FLOOR
<STREET2>GREAT WEST ROAD
<CITY>BRENTFORD
<STATE>X0
<ZIP>TW8 9DF
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>Abengoa Yield plc
<DATE-CHANGED>20140326
</FORMER-COMPANY>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>Abengoa Yield Ltd
<DATE-CHANGED>20140226
</FORMER-COMPANY>
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<DOCUMENT>
<TYPE>6-K
<SEQUENCE>1
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<DESCRIPTION>6-K
<TEXT>
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<div style="FONT-SIZE: 14pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">UNITED STATES</div>

<div style="FONT-SIZE: 14pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">SECURITIES AND EXCHANGE COMMISSION</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">Washington, D.C. 20549</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: center"><u>________________</u></div>

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<div style="FONT-SIZE: 18pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">FORM 6-K</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: center"><u>________________</u></div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">REPORT OF FOREIGN PRIVATE ISSUER</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">PURSUANT TO RULE 13a-16 OR 15d-16</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">UNDER THE SECURITIES EXCHANGE ACT OF 1934</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">For the month of April, 2018</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">Commission File Number 001-36487</div>

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<div style="FONT-SIZE: 24pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">Atlantica Yield plc</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: center">(Exact name of Registrant as Specified in its Charter)</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">Not Applicable</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: center">(Translation of Registrant's name into English)</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">Great West House, GW1, 17th floor</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">Great West Road</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">Brentford, TW8 9DF</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">United Kingdom</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">Tel.: +44 20 7098 4384</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left; TEXT-INDENT: 36pt">Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left; TEXT-INDENT: 36pt">Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): <font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'">&#9744;</font></div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left; TEXT-INDENT: 36pt">Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): <font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'">&#9744;</font></div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: justify">This Report on Form 6-K is incorporated by reference into each of the Registration Statements on Form F-3 of the Registrant filed with the Securities and Exchange Commission on July 2, 2015 (File No. 333-205433, File No. 333-205435 and File No. 333-205436). This Report on Form 6-K is also incorporated by reference into the Registration Statement on Form F-3 of the Registrant filed with the Securities and Exchange Commission on February 27, 2017 (File No.333-216253).</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: justify">April 17, 2018 &#8211; Algonquin Power &amp; Utilities (&#8220;Algonquin&#8221;, TSX/NYSE:AQN) announced today that it has exercised the option agreement in place between Algonquin and Abengoa S.A. to acquire the remaining ordinary shares of Atlantica Yield (&#8220;AY&#8221;) held by Abengoa at a price of $20.90 per share. These shares represent a 16.47% equity interest in Atlantica Yield. Algonquin previously acquired and currently holds a 25% equity interest in Atlantica Yield.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: justify">The additional acquisition is expected to close in the second or third quarter of 2018, subject to the approval of the Department of Energy of the United States and certain other closing conditions.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: justify">About Atlantica Yield</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: justify">Atlantica Yield plc is a total return company that owns a diversified portfolio of contracted renewable energy, power generation, electric transmission and water assets in North &amp; South America, and certain markets in EMEA.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: justify">www.atlanticayield.com</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">Chief Financial Officer</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">Francisco Martinez-Davis</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">E&#160; <font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-VARIANT: normal; FONT-WEIGHT: normal; FONT-STYLE: normal"><u>ir@atlanticayield.com</u></font></div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">Investor Relations &amp; Communication</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">Leire Perez</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">E&#160; <font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-VARIANT: normal; FONT-WEIGHT: normal; FONT-STYLE: normal"><u>ir@atlanticayield.com</u></font></div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">T&#160; +44 20 3499 0465</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-WEIGHT: bold; TEXT-ALIGN: center">SIGNATURES</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: justify; TEXT-INDENT: 36pt">Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">&#160;</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">ATLANTICA YIELD PLC</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">/s/ Santiago Seage</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">Name:</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">Santiago Seage</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">Title:</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">Chief Executive Officer</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: left">Date: April 17, 2018</div>

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