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/ Sergey Polikarpov Sergey Polikarpov
Title:	Director
MMC NORILSK NICKEL
By: Name:	/s/ Mikhail D. Prokhorov Mikhail D. Prokhorov
Title:	CEO and Chairman of The Management Board

CLAYBURN DEVELOPMENT INC.
By: Name:	/s/ Sergey Gorskiy Sergey Gorskiy
Title:	Attorney-in-Fact
BRANTON LIMITED
By: Name:	/s/ Maria Lambrianidou Maria Lambrianidou
Title:	Director

MIKHAIL D. PROKHOROV
By: Name:	/s/ Mikhail D. Prokhorov Mikhail D. Prokhorov
VLADIMIR O. POTANIN
By: Name:	/s/ Vladimir O. Potanin Vladimir O. Potanin