BUSINESS SEGMENTS - Schedule of Financial Information of Reportable Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) Segment	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Segment Reporting Information [Line Items]
Net revenue from external customers	$ 403,911	$ 229,762
Depreciation and amortization expenses	76,364	69,777
Gross profit	120,369	72,927
Operating income	80,255	50,913
Segment assets	6,772,438	5,838,947	$ 6,246,508
Expenditures for long-lived assets	$ 113,787	192,602
Number of segment, allocation of other segment items | Segment	2
Goodwill	$ 168,076		$ 168,244
Electricity
Segment Reporting Information [Line Items]
Depreciation and amortization expenses	65,577	59,976
Expenditures for long-lived assets	60,613	171,350
Goodwill	163,400	146,700
Electricity | Accounted for Under ASC 606
Segment Reporting Information [Line Items]
Net revenue from external customers	48,200	40,200
Product
Segment Reporting Information [Line Items]
Depreciation and amortization expenses	2,658	2,894
Expenditures for long-lived assets	1,367	1,200
Goodwill	0	0
Energy Storage
Segment Reporting Information [Line Items]
Depreciation and amortization expenses	8,129	6,908
Expenditures for long-lived assets	51,807	20,052
Goodwill	4,600	4,600
Energy Storage | Accounted for Under ASC 606
Segment Reporting Information [Line Items]
Net revenue from external customers	7,500	3,500
Operating Segments
Segment Reporting Information [Line Items]
Net revenue from external customers	403,911	229,762
Depreciation and amortization expenses	71,122	66,293
Other cost of revenues expenses	212,420	90,542
Gross profit	120,369	72,927
Segment operating expenses (income)	40,114	22,014
Operating income	80,255	50,913
Operating Segments | Electricity
Segment Reporting Information [Line Items]
Net revenue from external customers	181,603	180,241
Depreciation and amortization expenses	59,630	56,870
Other cost of revenues expenses	66,114	62,963
Gross profit	55,859	60,408
Segment operating expenses (income)	14,284	19,565
Operating income	41,575	40,843
Segment assets	5,772,836	5,124,073
Operating Segments | Product
Segment Reporting Information [Line Items]
Net revenue from external customers	177,383	31,769
Depreciation and amortization expenses	2,116	2,571
Other cost of revenues expenses	137,293	22,113
Gross profit	37,974	7,085
Segment operating expenses (income)	12,053	3,449
Operating income	25,921	3,636
Segment assets	283,188	244,796
Operating Segments | Energy Storage
Segment Reporting Information [Line Items]
Net revenue from external customers	44,925	17,752
Depreciation and amortization expenses	9,376	6,851
Other cost of revenues expenses	9,013	5,467
Gross profit	26,536	5,434
Segment operating expenses (income)	13,776	(1,000)
Operating income	12,760	6,434
Segment assets	716,414	470,078
Operating Segments | United States
Segment Reporting Information [Line Items]
Net revenue from external customers	178,574	155,204
Operating Segments | United States | Electricity
Segment Reporting Information [Line Items]
Net revenue from external customers	131,597	134,213
Operating Segments | United States | Product
Segment Reporting Information [Line Items]
Net revenue from external customers	2,052	3,239
Operating Segments | United States | Energy Storage
Segment Reporting Information [Line Items]
Net revenue from external customers	44,925	17,752
Operating Segments | Foreign
Segment Reporting Information [Line Items]
Net revenue from external customers	225,337	74,558
Operating Segments | Foreign | Electricity
Segment Reporting Information [Line Items]
Net revenue from external customers	50,006	46,028
Operating Segments | Foreign | Product
Segment Reporting Information [Line Items]
Net revenue from external customers	175,331	28,530
Operating Segments | Foreign | Energy Storage
Segment Reporting Information [Line Items]
Net revenue from external customers	0	0
Segment Reconciling Items
Segment Reporting Information [Line Items]
Segment assets	200,901	158,618
Segment Reconciling Items | Electricity
Segment Reporting Information [Line Items]
Segment assets	200,901	158,618
Segment Reconciling Items | Product
Segment Reporting Information [Line Items]
Segment assets	0	0
Segment Reconciling Items | Energy Storage
Segment Reporting Information [Line Items]
Segment assets	$ 0	$ 0