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v3.20.4

Variable Interest Entities (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) MW | Dec. 31, 2019 USD ($)
ATC |  |
Variable interest entities |  |
Equity method investment, ownership interest (as a percent) | 60.00% |
Equity investment | $ 1,733.5 | $ 1,684.7
ATC Holdco |  |
Variable interest entities |  |
Equity method investment, ownership interest (as a percent) | 75.00% |
Equity investment | $ 30.8 | $ 36.1
Power purchase agreement |  |
Variable interest entities |  |
Firm capacity from power purchase agreement (in megawatts) | MW | 236 |
Minimum energy requirements over remaining term of power purchase agreement (in megawatts) | MW | 0 |
Remaining term of power purchase agreement (in years) | 1 year |
Residual guarantee associated with power purchase agreement | $ 0.0 |
Required capacity payments over remaining term of power purchase agreement | $ 13.6 |

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- Definition Under long-term contracts with public utility districts, cooperatives or other organizations, a utility company receives a portion of the output of a production plant constructed and financed by the district or cooperative. The utility has only a nominal or no investment at all in the plant but pays a proportionate part of the plant's costs, including debt service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.D) -URI http://asc.fasb.org/extlink&oid=6499423&loc=d3e659339-123030 + Details
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