| Document and Entity Information | Oct. 23, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | Bloom Energy Corp |
| Amendment Flag | false |
| Entity Central Index Key | 0001664703 |
| Document Type | 8-K |
| Document Period End Date | Oct. 23, 2021 |
| Entity File Number | 001-38598 |
| Entity Incorporation State 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, $0.0001 par value |
| Trading Symbol | BE |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
