Mangrove Partners SC 13G Atlantic Power Corp

Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13G dated May 22, 2015 (including amendments thereto) with respect to the Common Stock of Atlantic Power Corporation.  This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

Dated:  May 22, 2015
	THE MANGROVE PARTNERS MASTER FUND, LTD.
	By:	MANGROVE PARTNERS the Investment Manager
	By:	/s/ Nathaniel August
		Name:	Nathaniel August
		Title:	Director

MP OPPORTUNITYCO 1, LLC
By:	MANGROVE CAPITAL as Managing Member
By:	/s/ Nathaniel August
	Name:	Nathaniel August
	Title:	Director

THE MANGROVE PARTNERS FUND, L.P.
By:	MANGROVE CAPITAL
	as General Partner
By:	/s/ Nathaniel August
	Name:	Nathaniel August
	Title:	Director

MANGROVE PARTNERS FUND (CAYMAN), LTD.
By:	MANGROVE PARTNERS
	the Investment Manager
By:	/s/ Nathaniel August
	Name:	Nathaniel August
	Title:	Director

MANGROVE PARTNERS
By:	/s/ Nathaniel August
	Name:	Nathaniel August
	Title:	Director

MANGROVE CAPITAL
By:	/s/ Nathaniel August
	Name:	Nathaniel August
	Title:	Director

/s/ Nathaniel August

NATHANIEL AUGUST