Schedule 13G
Exhibit A

Identification and Classification of Subsidiaries

Total Investments USA, Inc.

Total Investments USA, Inc. is a wholly owned indirect subsidiary of Total S.A.

Total Investments USA, Inc. beneficially owns the following shares:

Amount beneficially owned:		4,505,268
Percent of class:		8.1%
Number of shares as to which such person has:
	Sole power to vote:	4,505,268
	Shared power to vote:	-0-
	Sole power to dispose of:	4,505,268
	Shared power to dispose of:	-0-