EXHIBIT A

JOINT FILING AGREEMENT

The undersigned hereby agree that the statement on Schedule 13G with respect to the Common Stock of TransAlta Corporation dated January 18, 2019 and any further amendments thereto signed by each of the undersigned shall be, filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

Dated: January 18, 2019

THE MANGROVE PARTNERS MASTER FUND, LTD.
By:	MANGROVE PARTNERS, as Investment Manager
By:	/s/ Nathaniel August
	Name:	Nathaniel August
	Title:	Director

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

/s/ Nathaniel August

NATHANIEL AUGUST