Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document Information [Line Items]
Entity Registrant Name	Bloom Energy Corp
Entity Central Index Key	0001664703
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Emerging Growth Company	true
Entity Small Business	false
Entity Ex Transition Period	false
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		60,021,168
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		53,543,216