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PRINCIPAL ACCOUNTING POLICIES - Movement of accrued warranty cost (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
PRINCIPAL ACCOUNTING POLICIES      
Accrue (reversal) to selling and marketing expense   ¥ 75,000  
Solar modules      
PRINCIPAL ACCOUNTING POLICIES      
At beginning of year ¥ 1,641,721 1,007,805 ¥ 892,131
Additions 1,348,516 771,244 390,238
Utilization (222,073) (212,130) (170,776)
Accrue (reversal) to selling and marketing expense (386,910) 74,802 (103,788)
At end of year 2,381,254 1,641,721 ¥ 1,007,805
ESS products      
PRINCIPAL ACCOUNTING POLICIES      
At beginning of year 2,254    
Additions 23,186 2,254  
At end of year ¥ 25,440 ¥ 2,254