EXHIBIT F AGREEMENT RELATING TO JOINT FILING OF SCHEDULE 13D/A

EXHIBIT F

AGREEMENT RELATING TO JOINT FILING OF SCHEDULE 13D/A

     The undersigned hereby agree that a joint statement on Schedule 13D be filed on behalf of all of the undersigned with respect to the securities of Plug Power Inc.

Date: July 10, 2006

		SMART HYDROGEN INC.
		By: Name:		/s/ Xxxxxx Polikarpov Xxxxxx Polikarpov
		Title:		Director
		MMC NORILSK NICKEL
		By: Name:		/s/ Xxxxxxx X. Xxxxxxxxx Xxxxxxx X. Xxxxxxxxx
		Title:		CEO and Chairman of The Management Board

		XXXXXXXX DEVELOPMENT INC.
		By: Name:		/s/ Xxxxxx Xxxxxxx Xxxxxx Xxxxxxx
		Title:		Attorney-in-Fact
		XXXXXXX LIMITED
		By: Name:		/s/ Xxxxx Xxxxxxxxxxxx Xxxxx Xxxxxxxxxxxx
		Title:		Director

		XXXXXXX X. XXXXXXXXX
		By: Name:		/s/ Xxxxxxx X. Xxxxxxxxx Xxxxxxx X. Xxxxxxxxx
		XXXXXXXX X. XXXXXXX
		By: Name:		/s/ Xxxxxxxx X. Xxxxxxx Xxxxxxxx X. Xxxxxxx