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BORROWINGS - Long term narrative and interest expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
BORROWINGS |  |  |
Floating interest rate (as a percent) | 3.46% | 4.37% |
Interest expense |  |  |
Interest capitalized - project assets | $ 17,316 | $ 10,197 | $ 10,794
Interest capitalized - property, plant, and equipment |  | 154 | 2,620
Interest expense | 58,153 | 71,874 | 81,326
Total interest incurred | $ 75,469 | $ 82,225 | $ 94,740
Unsecured |  |  |
BORROWINGS |  |  |
Floating interest rate (as a percent) | 3.03% | 3.26% |
Secured by project assets and solar power systems |  |  |
BORROWINGS |  |  |
Floating interest rate (as a percent) | 3.04% | 3.63% |

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