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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) | 12 Months Ended
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Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Retail revenue period for billing postpaid customers in advance | 1 month
Expected amortization period, when the Company utilizes the practical expedient and expenses the costs as incurred | true
Renewable Energy | Minimum |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Amortization period | 2 years
Renewable Energy | Maximum |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Amortization period | 6 years

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