| Cover | Jan. 18, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 18, 2023 |
| Entity File Number | 001-39982 |
| Entity Registrant Name | Energy Vault Holdings, Inc. |
| Entity Central Index Key | 0001828536 |
| Entity Tax Identification Number | 85-3230987 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 4360 Park Terrace Drive |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Westlake Village |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 91361 |
| City Area Code | 805 |
| Local Phone Number | 852-0000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | NRGV |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
