CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues:
Electricity	$ 82,247	$ 78,268
Product	50,105	19,552
Total revenues	132,352	97,820
Cost of revenues:
Electricity	57,931	65,937
Product	34,627	16,890
Total cost of revenues	92,558	82,827
Gross margin	39,794	14,993
Operating expenses:
Research and development expenses	1,048	2,207
Selling and marketing expenses	4,922	2,660
General and administrative expenses	7,314	7,007
Write-off of unsuccessful exploration activities	768
Operating income	25,742	3,119
Other income (expense):
Interest income	388	135
Interest expense, net	(14,878)	(13,080)
Foreign currency translation and transaction gains	14	517
Income attributable to sale of tax benefits	2,517	2,139
Other non-operating expense, net	(161)	(797)
Income (loss), before income taxes and equity in losses of investees	13,622	(7,967)
Income tax provision	(5,457)	(586)
Equity in losses of investees	(140)	(412)
Net income (loss)	8,025	(8,965)
Net income attributable to noncontrolling interest	(130)	(10)
Net income (loss) attributable to the Company's stockholders	7,895	(8,975)
Comprehensive income (loss):
Net income (loss)	8,025	(8,965)
Other comprehensive income (loss), net of related taxes:
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge	(47)	(53)
Change in unrealized gains or losses on marketable securities available-for-sale	(30)	(23)
Comprehensive income (loss)	7,948	(9,041)
Comprehensive income attributable to noncontrolling interest	(130)	(10)
Comprehensive income (loss) attributable to the Company's stockholders	$ 7,818	$ (9,051)
Earnings (loss) per share attributable to the Company's stockholders - basic and diluted	$ 0.17	$ (0.20)
Weighted average number of shares used in computation of earnings (loss) per share attributable to the Company's stockholders:
Basic	45,431	45,431
Diluted	45,437	45,431
Dividend per share declared		$ 0.05