Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 30, 2020
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-38598
Entity Registrant Name	BLOOM ENERGY CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0565408
Entity Address, Address Line One	4353 North First Street
Entity Address, City or Town	San Jose
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95134
Entity Central Index Key	0001664703
Current Fiscal Year End Date	--12-31
City Area Code	408
Local Phone Number	543-1500
Title of 12(b) Security	Class A Common Stock, $0.0001 par value
Trading Symbol	BE
Security Exchange Name	NYSE
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		138,307,369
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		27,891,011