Exhibit 99.1

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1)(iii) of the Securities Exchange Act of 1934, as amended, each of the undersigned agrees that a single joint Schedule 13D and any amendments thereto may be filed on behalf of each of the undersigned with respect to the securities held by each of them in Pattern Energy Group Inc.  This Joint Filing Agreement shall be included as an Exhibit to such Schedule 13D.

Dated: November 11, 2014

PATTERN RENEWABLES LP
By:		/s/ Dyann S. Blaine
Name:		Dyann S. Blaine
Title:		Vice President
PATTERN RENEWABLES GP LLC
By:		/s/ Dyann S. Blaine
Name:		Dyann S. Blaine
Title:		Vice President
PATTERN DEVELOPMENT FINANCE COMPANY LLC
By:	/s/ Dyann S. Blaine
Name:	Dyann S. Blaine
Title:	Vice President
PATTERN ENERGY GROUP LP
By:		/s/ Dyann S. Blaine
Name:		Dyann S. Blaine
Title:		Vice President
PATTERN ENERGY GP LLC
By:		/s/ Daniel M. Elkort
Name:		Daniel M. Elkort
Title:		Vice President
PATTERN ENERGY GROUP HOLDINGS LP
By:		/s/ Daniel M. Elkort
Name:		Daniel M. Elkort
Title:		Vice President

PATTERN ENERGY GROUP HOLDINGS GP LLC
By R/C Wind II LP, its managing member
By Riverstone/Carlyle Renewable Energy Grant GP, L.L.C., its general partner
By R/C Renewable Energy GP II, L.L.C., its sole member
By:	/s/ Thomas J. Walker
Name:	Thomas J. Walker
Title:	Authorized Person
R/C WIND II LP
By Riverstone/Carlyle Renewable Energy Grant GP, L.L.C., its general partner
By R/C Renewable Energy GP II, L.L.C., its sole member
By:	/s/ Thomas J. Walker
Name:	Thomas J. Walker
Title:	Authorized Person
RIVERSTONE/CARLYLE RENEWABLE ENERGY GRANT GP, L.L.C.
By R/C Renewable Energy GP II, L.L.C., its sole member
By:	/s/ Thomas J. Walker
Name:	Thomas J. Walker
Title:	Authorized Person
R/C RENEWABLE ENERGY GP II, L.L.C.
By:	/s/ Thomas J. Walker
Name:	Thomas J. Walker
Title:	Authorized Person