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PRINCIPAL ACCOUNTING POLICIES - Movement of accrued warranty cost (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
PRINCIPAL ACCOUNTING POLICIES      
Utilization ¥ (199,000) ¥ (277,000) ¥ (222,000)
Solar modules      
PRINCIPAL ACCOUNTING POLICIES      
At beginning of year 2,361,596 2,381,254 1,641,721
Additions 802,051 1,245,880 1,348,516
Utilization (198,606) (276,554) (222,073)
Reversal to selling and marketing expense (1,132,838) (988,984) (386,910)
At end of year 1,832,203 2,361,596 2,381,254
ESS products      
PRINCIPAL ACCOUNTING POLICIES      
At beginning of year 43,040 25,440 2,254
Additions 1,411 19,165 23,186
Utilization (3,224) (1,565) 0
Reversal to selling and marketing expense (7,725)    
At end of year ¥ 33,502 ¥ 43,040 ¥ 25,440