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Business and asset acquisitions (Details) $ in Thousands, $ in Thousands | 1 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) MWac | Jan. 31, 2021 USD ($) MWac windProject | Oct. 31, 2020 USD ($) | Nov. 30, 2019 windProject | Jun. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) facility | Jun. 30, 2021 CLP ($) facility | Dec. 31, 2019 windProject MWac | Dec. 31, 2020 USD ($)
ESSAL |  |  |  |  |  |  |  |  |
Net assets acquired, net of cash and cash equivalents |  |  |  |  |  |  |  |  |
Non-controlling interest (percent) |  | 30.00% |  |  |  |  |  |  |
Mid-west Wind Development Project |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of wind projects | windProject |  |  |  |  |  |  |  | 3 |
Wind power capacity (megawatt AC) | MWac |  |  |  |  |  |  |  | 600 |
Tax equity funding |  |  |  |  | $ 530,880 | $ 530,880 |  |  |
Total purchase price |  |  |  |  |  | 97,004 |  |  |
Existing loans treated as a reduction of consideration incurred |  |  |  |  |  | 789,923 |  |  |
Net assets acquired, net of cash and cash equivalents |  |  |  |  |  |  |  |  |
Working capital |  |  |  |  | (28,630) | (28,630) |  |  |
Property, plant and equipment |  |  |  |  | 1,136,390 | 1,136,390 |  |  |
Long-term debt |  |  |  |  | (789,804) | (789,804) |  |  |
Asset retirement obligation |  |  |  |  | (27,053) | (27,053) |  |  |
Deferred tax liability |  |  |  |  | (2,969) | (2,969) |  |  |
Other liabilities |  |  |  |  | (104,129) | (104,129) |  |  |
Non-controlling interest |  |  |  |  | (29,141) | (29,141) |  |  |
Total net assets acquired |  |  |  |  | 154,664 | 154,664 |  |  |
Cash and cash equivalents acquired |  |  |  |  | 15,860 | 15,860 |  |  |
Total net assets acquired, net of cash and cash equivalents |  |  |  |  | 138,804 | $ 138,804 |  |  |
Missouri Wind Projects |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of wind projects | windProject |  |  |  | 2 |  |  |  |  |
North Fork Ridge Wind Project |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of wind projects | facility |  |  |  |  |  | 3 | 3 |  |
Tax equity funding |  |  |  |  |  |  |  |  | $ 29,446
Altavista Solar Facility |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total purchase price | $ 6,735 |  |  |  |  |  |  |  |
Existing loans treated as a reduction of consideration incurred | 122,024 |  |  |  |  |  |  |  |
Net assets acquired, net of cash and cash equivalents |  |  |  |  |  |  |  |  |
Working capital | 870 |  |  |  |  |  |  |  |
Property, plant and equipment | 138,343 |  |  |  |  |  |  |  |
Long-term debt | (122,024) |  |  |  |  |  |  |  |
Asset retirement obligation | (3,332) |  |  |  |  |  |  |  |
Deferred tax liability | (421) |  |  |  |  |  |  |  |
Total net assets acquired | 13,436 |  |  |  |  |  |  |  |
Cash and cash equivalents acquired | 33 |  |  |  |  |  |  |  |
Total net assets acquired, net of cash and cash equivalents | $ 13,403 |  |  |  |  |  |  |  |
Equity interest (percent) | 50.00% |  |  |  |  |  |  |  |
Solar power capacity (megawatt ac) | MWac | 80 |  |  |  |  |  |  |  |
Ownership interest acquired (percent) | 50.00% |  |  |  |  |  |  |  |
Maverick Creek and Sugar Creek Wind Facilities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of wind projects | windProject |  | 2 |  |  |  |  |  |  |
Total purchase price |  | $ 43,797 |  |  |  |  |  |  |
Existing loans treated as a reduction of consideration incurred |  | 87,035 |  |  |  |  |  |  |
Net assets acquired, net of cash and cash equivalents |  |  |  |  |  |  |  |  |
Working capital |  | (15,557) |  |  |  |  |  |  |
Property, plant and equipment |  | 1,068,708 |  |  |  |  |  |  |
Long-term debt |  | (855,409) |  |  |  |  |  |  |
Asset retirement obligation |  | (23,402) |  |  |  |  |  |  |
Deferred tax liability |  | (6,431) |  |  |  |  |  |  |
Derivative instruments |  | 7,575 |  |  |  |  |  |  |
Total net assets acquired |  | 175,484 |  |  |  |  |  |  |
Cash and cash equivalents acquired |  | 4,241 |  |  |  |  |  |  |
Total net assets acquired, net of cash and cash equivalents |  | $ 171,243 |  |  |  |  |  |  |
Equity interest (percent) |  | 50.00% |  |  |  |  |  |  |
Ownership interest acquired (percent) |  | 50.00% |  |  |  |  |  |  |
Consideration payable |  |  |  |  | 18,641 | $ 18,641 |  |  |
Maverick Creek Wind Facility |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Wind power capacity (megawatt AC) | MWac |  | 492 |  |  |  |  |  |  |
Existing loans treated as a reduction of consideration incurred |  |  |  |  | 570,580 |  |  |  |
Sugar Creek Wind Facility |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Wind power capacity (megawatt AC) | MWac |  | 202 |  |  |  |  |  |  |
Tax equity funding |  |  |  |  | 73,957 | 73,957 |  |  |
Existing loans treated as a reduction of consideration incurred |  |  |  |  | $ 284,829 |  |  |  |
ESSAL |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total purchase price |  |  | $ 162,086 |  |  |  |  |  |
Net assets acquired, net of cash and cash equivalents |  |  |  |  |  |  |  |  |
Ownership interest acquired (percent) |  |  | 94.00% |  |  |  |  |  |
Increase in accruals and long-term debt |  |  |  |  |  | 3,183 | $ 2,534,109 |  |
Increase in goodwill |  |  |  |  |  | $ 3,183 | $ 2,534,109 |  |
Ownership interest sold (percent) |  | 32.00% |  |  |  |  |  |  |
Ownership interest after transaction (percent) |  | 64.00% |  |  |  |  |  |  |
ESSAL | Third Party |  |  |  |  |  |  |  |  |
Net assets acquired, net of cash and cash equivalents |  |  |  |  |  |  |  |  |
Ownership interest sold |  | $ 51,750 |  |  |  |  |  |  |

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