Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Revenues:
Product sales and revenues	$ 29,382	$ 16,218	$ 81,815	$ 42,033
Research and development contracts	1,778	2,655	6,032	8,043
Total revenues	31,160	18,873	87,847	50,076
Costs and expenses:
Cost of product sales and revenues	29,133	20,050	94,652	57,183
Cost of research and development contracts	1,890	2,579	6,244	7,942
Administrative and selling expenses	3,578	4,185	12,082	12,888
Research and development expenses	3,918	4,618	12,662	14,327
Total costs and expenses	38,519	31,432	125,640	92,340
Loss from operations	(7,359)	(12,559)	(37,793)	(42,264)
Interest expense	(847)	(10)	(1,829)	(118)
Loss from equity investment	(94)	(183)	(149)	(576)
Interest and other income, net	496	296	1,530	979
Loss before redeemable preferred stock of subsidiary	(7,804)	(12,456)	(38,241)	(41,979)
Accretion of redeemable preferred stock of subsidiary		(603)	(525)	(1,763)
Loss before provision for income taxes	(7,804)	(13,059)	(38,766)	(43,742)
Provision for income taxes	(26)	(55)	(79)	(68)
Net loss	(7,830)	(13,114)	(38,845)	(43,810)
Net loss attributable to noncontrolling interest	76	88	197	270
Net loss attributable to FuelCell Energy, Inc.	(7,754)	(13,026)	(38,648)	(43,540)
Adjustment for modification of redeemable preferred stock of subsidiary			(8,987)
Preferred stock dividends	(800)	(799)	(2,400)	(2,401)
Net loss to common shareholders	$ (8,554)	$ (13,825)	$ (50,035)	$ (45,941)
Loss per share basic and diluted:
Net loss per share to common shareholders	$ (0.07)	$ (0.15)	$ (0.41)	$ (0.52)
Basic and diluted weighted average shares outstanding	126,923,550	93,512,868	122,306,465	87,510,734