SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	May 18, 2026	May 15, 2026
Eskom Holdings SOC Ltd. \| Forecast
Subsequent Event [Line Items]
Asset sale consideration (approximately)		$ 10.3
Performance bond as percentage of contract price		6.00%
Subsequent Event \| Senior Secured Convertible Debentures
Subsequent Event [Line Items]
Annual interest rate	7.50%
Debt instrument, face amount	$ 75.0
Proceeds from convertible debt, gross	42.0
Proceeds from convertible debt	$ 39.6
Issuance price percentage of par	95.00%
Scheduled installments of principal and accrued interest payments, per $10.00 million of original principal	$ 10.0
Daily VWAP, four prior trading days	97.00%
Amortization Event, shares issued threshold under Exchange Cap without stockholder approval, percentage	99.00%
Amortization Event in effect, installment amount increase, percent of then-outstanding principal	20.00%
Debt instrument, face amount	$ 75.0
Proceeds from convertible debt, gross	42.0
Proceeds from convertible debt	$ 39.6
Issuance price percentage of par	95.00%
Annual interest rate	7.50%
Subsequent Event \| Senior Secured Convertible Debentures \| First Payment Date
Subsequent Event [Line Items]
Scheduled installments of principal and accrued interest payments, per $10.00 million of original principal	$ 1.2
Floor price (in usd per share)	$ 1.19
Subsequent Event \| Senior Secured Convertible Debentures \| Next 13 Payment Dates
Subsequent Event [Line Items]
Scheduled installments of principal and accrued interest payments, per $10.00 million of original principal	$ 1.2
Subsequent Event \| Senior Secured Convertible Debentures \| After 13 Payment Date
Subsequent Event [Line Items]
Scheduled installments of principal and accrued interest payments, per $10.00 million of original principal	1.1
Subsequent Event \| Senior Secured Convertible Debentures \| Maturity
Subsequent Event [Line Items]
Scheduled installments of principal and accrued interest payments, per $10.00 million of original principal	$ 1.1
Subsequent Event \| Maximum \| Senior Secured Convertible Debentures
Subsequent Event [Line Items]
Annual interest rate	18.00%
Amortization Event, number of consecutive trading days, below Floor Price	7 days
Annual interest rate	18.00%
Subsequent Event \| Minimum \| Senior Secured Convertible Debentures
Subsequent Event [Line Items]
Amortization Event, number of consecutive trading days, below Floor Price	5 days
BayWa r.e. Japan K.K. \| Subsequent Event
Subsequent Event [Line Items]
Total consideration		$ 0.3
Working capital payment		0.5
Loss contingency		$ 4.9

Energy Vault Holdings, Inc. 10-Q