Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Revenues:
Product	$ 737	$ 15,424	$ 2,544	$ 40,497
Service and license	12,592	10,353	19,528	16,560
Generation	1,634	220	3,719	333
Advanced technologies	5,454	2,584	11,628	4,673
Total revenues	20,417	28,581	37,419	62,063
Costs of revenues:
Product	3,204	15,118	7,259	39,507
Service and license	12,159	10,821	18,425	17,440
Generation	1,294	167	2,409	399
Advanced technologies	3,377	2,632	7,130	5,040
Total costs of revenues	20,034	28,738	35,223	62,386
Gross profit (loss)	383	(157)	2,196	(323)
Operating expenses:
Administrative and selling expenses	6,483	7,441	12,487	13,481
Research and development expenses	5,386	5,110	10,778	10,421
Restructuring expense	10		1,355
Total costs and expenses	11,879	12,551	24,620	23,902
Loss from operations	(11,496)	(12,708)	(22,424)	(24,225)
Interest expense	(2,310)	(982)	(4,577)	(1,827)
Other income (expense), net	532	(1,547)	123	(859)
Loss before provision for income taxes	(13,274)	(15,237)	(26,878)	(26,911)
Benefit (provision) for income taxes	36	(177)	(45)	(282)
Net loss	(13,238)	(15,414)	(26,923)	(27,193)
Net loss attributable to noncontrolling interest	0	41	0	108
Net loss attributable to FuelCell Energy, Inc.	(13,238)	(15,373)	(26,923)	(27,085)
Preferred stock dividends	(800)	(800)	(1,600)	(1,600)
Net loss attributable to common shareholders	$ (14,038)	$ (16,173)	$ (28,523)	$ (28,685)
Loss per share basic and diluted:
Net loss per share attributable to common shareholders	$ (0.33)	$ (0.56)	$ (0.71)	$ (1.04)
Basic and diluted weighted average shares outstanding	42,568,818	28,782,066	40,049,948	27,500,236