Exhibit D

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned agree that the Statement on Schedule 13D to which this exhibit is attached is filed on behalf of each of them.

Date: November 19, 2012

JSC “INTER RAO Capital”
/s/ Marat A. Khanafeev
Name:		Marat A. Khanafeev
Title:		General Director
JSC “INTER RAO UES”
/s/ Ilnar I. Mirsiyapov
Name:		Ilnar I. Mirsiyapov
Title:		Member of the Management Board