Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Feb. 15, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
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
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
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 3.8
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for the 2022 Annual Meeting of Stockholders (the “2022 Proxy Statement”) are incorporated into Part III hereof. The 2022 Proxy Statement will be filed with the U.S. Securities and Exchange Commission ("SEC") within 120 days after the registrant’s year ended December 31, 2021.
Entity Central Index Key	0001664703
Document Fiscal Year Focus	2021
Document Fiscal Period Focus (i.e. Q1,Q2,Q3,FY)	FY
Amendment Flag	false
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		161,284,535
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		15,832,833