Exhibit 3.1

SECOND AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF

PATTERN ENERGY GROUP INC.

FIRST. The name of the Corporation is Pattern Energy Group Inc.

SECOND. The registered office of the Corporation in the State of Delaware is 251 Little Falls Drive, in the City of Wilmington, County of New Castle, 19808. The name of the Corporation’s registered agent at that address is Corporation Service Company.

THIRD. The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware (the “DGCL”) or any successor statute.

FOURTH. The total number of shares of all classes of capital stock that the Corporation is authorized to issue is 110,400,000 shares. The Corporation is authorized to issue two classes of shares, designated “Common Stock” and “Preferred Stock.” The total number of shares of Common Stock authorized to be issued is 100,000,000 shares, $0.01 par value per share. The total number of shares of Preferred Stock authorized to be issued is 10,400,000 shares, $0.01 par value per share.

The following is a statement of the designations and the powers, privileges and rights, and the qualifications, limitations or restrictions thereof in respect of each class of capital stock of the Corporation.

1. General. The voting, dividend and liquidation rights of the holders of the Common Stock are subject to and qualified by the rights, powers and preferences of the holders of the Preferred Stock set forth herein.

2. Voting. The holders of the Common Stock are entitled to one vote for each share of Common Stock held at all meetings of stockholders (and written actions in lieu of meetings); provided, however, that, except as otherwise required by law, holders of Common Stock, as such, shall not be entitled to vote on any amendment to the Certificate of Incorporation or to a Preferred Stock Designation that relates solely to the terms of one or more outstanding series of Preferred Stock if the holders of such affected series are entitled, either separately or together with the holders of one or more other such series, to vote thereon pursuant to the Certificate of Incorporation or a Preferred Stock Designation or pursuant to the DGCL. Subject to the rights of the holders of any series of Preferred Stock, the number of authorized shares of the Common Stock or Preferred Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a majority in voting power of the stock of the Corporation entitled to vote thereon irrespective of the provisions of Section 242(b)(2) of the DGCL, and no vote of the holders of either the Common Stock or Preferred Stock voting separately as a class shall be required therefor.

1

Shares of Preferred Stock may be issued from time to time in one or more series. The Board is hereby authorized to provide, by resolution or resolutions from time to time, for the issuance, out of the unissued shares of Preferred Stock, of one or more series of Preferred Stock, without stockholder approval, by filing a certificate pursuant to the applicable law of the State of Delaware (the “Preferred Stock Designation”), setting forth such resolution and, with respect to each such series, establishing the number of shares to be included in such series, and fixing the voting powers, full or limited, or no voting power of the shares of such series, and the designation, preferences and relative, participating, optional or other special rights, if any, of the shares of each such series and any qualifications, limitations or restrictions thereof. The powers, designation, preferences and relative, participating, optional and other special rights of each series of Preferred Stock, and the qualifications, limitations and restrictions thereof, if any, may differ from those of any and all other series at any time outstanding. The authority of the Board with respect to each series of Preferred Stock shall include, but not be limited to, the determination of the following:

2

all as may be determined from time to time by the Board and stated in the resolution or resolutions providing for the issuance of such Preferred Stock. Without limiting the generality of the foregoing, the resolutions providing for issuance of any series of Preferred Stock may provide that such series shall be superior or rank equally or be junior to any other series of Preferred Stock to the extent permitted by law. Any shares of Preferred Stock which may be redeemed, purchased or acquired by the Corporation may be reissued except as otherwise provided by law.

The Series A Perpetual Preferred Stock shall have the designations, rights, preferences, powers, restrictions and limitations as set forth in the Certificate of Designations of Rights and Preferences attached hereto as Annex A.

FIFTH. In furtherance and not in limitation of the powers conferred by the laws of the State of Delaware, the board of directors, acting by majority vote, is expressly authorized to make, alter, amend or repeal, in whole or in part, the bylaws of the Corporation.

SIXTH. Unless and except to the extent that the bylaws of the Corporation shall so require, election of directors of the Corporation need not be by written ballot.

SEVENTH.

A. To the fullest extent permitted by the DGCL, a director of the Corporation shall not be personally liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty owed to the Corporation or its stockholders.

B. Neither the amendment nor repeal of this Article SEVENTH, nor the adoption of any provision of, or any other amendment to, this Amended and Restated Certificate of Incorporation, nor, to the fullest extent permitted by the DGCL, any modification of law, shall eliminate, reduce or otherwise adversely affect any right or protection of a current or former director of the Corporation existing at the time of such amendment, repeal, adoption or modification.

C. If the DGCL is amended to authorize corporate action further eliminating or limiting the liability of directors, then a director of the Corporation shall be free of liability to the fullest extent permitted by the DGCL, as so amended.

D. This Article SEVENTH shall not limit or exclude any rights, indemnities or limitations of liability to which any director of the Corporation may be entitled, whether as a matter of law, under the bylaws of the Corporation, by agreement, by vote of the stockholders, approval of the directors of the Corporation or otherwise.

EIGHTH. The Corporation hereby expressly elects not to be governed by Section 203 of the DGCL, and the restrictions contained in Section 203 of the DCGL shall not apply to the Corporation.

NINTH. Unless the Corporation consents in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware shall, to the fullest extent permitted by law, be the sole and exclusive forum for (A) any “internal corporate claim” within the meaning of the DGCL and (B) (i) any derivative action or proceeding brought on behalf of

3

the Corporation, (ii) any action asserting a claim of breach of a fiduciary duty owed by, or other wrongdoing by, any director, officer, employee or agent of the Corporation to the Corporation or the Corporation’s stockholders, (iii) any action asserting a claim arising pursuant to any provision of the DGCL or this Amended and Restated Certificate of Incorporation or the Corporation’s bylaws (as either may be amended and/or restated from time to time), (iv) any action to interpret, apply, enforce or determine the validity of this Amended and Restated Certificate of Incorporation or the Corporation’s bylaws (as either may be amended and/or restated from time to time), or (v) any action asserting a claim governed by the internal affairs doctrine, in each case subject to said court having personal jurisdiction over the indispensable parties named as defendants therein; provided, that, if and only if the Court of Chancery of the State of Delaware dismisses any such action for lack of subject matter jurisdiction, such action may be brought in another state court sitting in the State of Delaware. To the fullest extent permitted by law, any person or entity purchasing or otherwise acquiring any interest in shares of capital stock of the Corporation shall be deemed to have notice of and consented to the provisions of this Article NINTH.

TENTH. If any provision or provisions of this Amended and Restated Certificate of Incorporation shall be held to be invalid, illegal or unenforceable as applied to any circumstance for any reason whatsoever: (i) the validity, legality and enforceability of such provisions in any other circumstance and of the remaining provisions of this Amended and Restated Certificate of Incorporation (including, without limitation, each portion of any paragraph of this Amended and Restated Certificate of Incorporation containing any such provision held to be invalid, illegal or unenforceable that is not itself held to be invalid, illegal or unenforceable) shall not in any way be affected or impaired thereby and (ii) to the fullest extent possible, the provisions of this Amended and Restated Certificate of Incorporation (including, without limitation, each such portion of any paragraph of this Amended and Restated Certificate of Incorporation containing any such provision held to be invalid, illegal or unenforceable) shall be construed so as to permit the Corporation to protect its directors, officers, employees and agents from personal liability in respect of their good faith service or for the benefit of the Corporation to the fullest extent permitted by law.

[The remainder of this page intentionally left blank]

4