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v3.21.2

Equity Method Investment (Details) | 1 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2021 USD ($) | Jun. 30, 2021 USD ($) MW | Jun. 30, 2020 USD ($)
Business Acquisition [Line Items] |  |  |
Ownership percentage |  | 50.00% |
Distributions from NMRD |  | $ 572,000 | $ 0
NMRD |  |  |
Business Acquisition [Line Items] |  |  |
Renewable energy capacity in operating (in mw) | MW |  | 135.1 |
PNMR Development |  |  |
Business Acquisition [Line Items] |  |  |
Ownership percentage |  | 50.00% |
PNMR Development | NMRD |  |  |
Business Acquisition [Line Items] |  |  |
Ownership percentage |  | 50.00% |
Contribution to construction activities |  | $ 0 | $ 18,300,000
Distributions from NMRD | $ 3,000,000.0 |  |
Earnings from equity method investments, net of dividends or distributions | 2,400,000 |  |
Proceeds from equity method investment, distribution, return of capital | $ 600,000 |  |
AEP OnSite Partners | NMRD |  |  |
Business Acquisition [Line Items] |  |  |
Ownership percentage |  | 50.00% |

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