JOINT FILING AGREEMENT

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 13G 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 13G.

Dated: February 13, 2014
	PATTERN RENEWABLES LP
	By:	/s/ Xxxxx X. Xxxxxx
	Name:	Xxxxx X. Xxxxxx
	Title:	Vice President
	PATTERN RENEWABLES GP LLC
	By:	/s/ Xxxxx X. Xxxxxx
	Name:	Xxxxx X. Xxxxxx
	Title:	Vice President
	PATTERN ENERGY GROUP LP
	By:	/s/ Xxxxx X. Xxxxxx
	Name:	Xxxxx X. Xxxxxx
	Title:	Vice President
	PATTERN ENERGY GP LLC
	By:	/s/ Xxxxxx X. Xxxxxx
	Name:	Xxxxxx X. Xxxxxx
	Title:	Vice President
	PATTERN ENERGY GROUP HOLDINGS LP
	By:	/s/ Xxxxxx X. Xxxxxx
	Name:	Xxxxxx X. Xxxxxx
	Title:	Vice President

	PATTERN ENERGY GROUP HOLDINGS GP LLC
	By R/C Wind II LP, its managing member
	By Riverstone/Carlyle Renewable Energy Xxxxx XX, L.L.C.,
	its general partner
	By R/C Renewable Energy XX XX, L.L.C., its sole member
	By:	/s/ Xxxxxx X. Xxxxxx
	Name:	Xxxxxx X. Xxxxxx
	Title:	Authorized Person
	R/C WIND II LP
	By Riverstone/Carlyle Renewable Energy Xxxxx XX, L.L.C.,
	its general partner
	By R/C Renewable Energy XX XX, L.L.C., its sole member
	By:	/s/ Xxxxxx X. Xxxxxx
	Name:	Xxxxxx X. Xxxxxx
	Title:	Authorized Person
	RIVERSTONE/CARLYLE RENEWABLE ENERGY XXXXX XX, L.L.C.
	By R/C Renewable Energy XX XX, L.L.C., its sole member
	By:	/s/ Xxxxxx X. Xxxxxx
	Name:	Xxxxxx X. Xxxxxx
	Title:	Authorized Person
	R/C RENEWABLE ENERGY XX XX, L.L.C.
	By:	/s/ Xxxxxx X. Xxxxxx
	Name:	Xxxxxx X. Xxxxxx
	Title:	Authorized Person