Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Revenues:
Product	$ 611	$ 13,681	$ 3,155	$ 54,178
Service and license	4,809	4,280	24,337	20,840
Generation	1,690	200	5,409	533
Advanced technologies	3,248	3,555	14,876	8,228
Total revenues	10,358	21,716	47,777	83,779
Costs of revenues:
Product	4,266	13,740	11,525	53,247
Service and license	4,453	4,087	22,878	21,527
Generation	1,500	197	3,909	596
Advanced technologies	2,765	3,258	9,895	8,298
Total costs of revenues	12,984	21,282	48,207	83,668
Gross (loss) profit	(2,626)	434	(430)	111
Operating expenses:
Administrative and selling expenses	6,310	5,458	18,797	18,939
Research and development expenses	5,394	5,299	16,172	15,720
Restructuring expense			1,355
Total costs and expenses	11,704	10,757	36,324	34,659
Loss from operations	(14,330)	(10,323)	(36,754)	(34,548)
Interest expense	(2,279)	(1,373)	(6,856)	(3,200)
Other (expense) income, net	(393)	749	(270)	(110)
Loss before provision for income taxes	(17,002)	(10,947)	(43,880)	(37,858)
Benefit (provision) for income taxes	1	(120)	(44)	(402)
Net loss	(17,001)	(11,067)	(43,924)	(38,260)
Net loss attributable to noncontrolling interest	0	57	0	165
Net loss attributable to FuelCell Energy, Inc.	(17,001)	(11,010)	(43,924)	(38,095)
Preferred stock dividends	(800)	(800)	(2,400)	(2,400)
Net loss attributable to common shareholders	$ (17,801)	$ (11,810)	$ (46,324)	$ (40,495)
Loss per share basic and diluted:
Net loss per share attributable to common shareholders	$ (0.31)	$ (0.38)	$ (1.01)	$ (1.41)
Basic and diluted weighted average shares outstanding	57,420,050	31,015,658	45,903,033	28,680,596