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Summary of Significant Accounting Policies - Solar power and battery energy storage systems (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Solar power systems |  |
Summary of Significant Accounting Policies |  |
Estimated useful lives |  | 30 years
Solar power systems | Maximum |  |
Summary of Significant Accounting Policies |  |
Estimated useful lives | 35 years |
Solar power systems | Depreciation life |  |
Summary of Significant Accounting Policies |  |
Estimated useful lives | 35 years |
Increase or decrease in depreciation expenses | $ (2,642) | $ (629)
Battery energy storage systems | Maximum |  |
Summary of Significant Accounting Policies |  |
Estimated useful lives | 25 years |

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