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v3.20.2

Changes in Capital Structure - Equity Offering (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 47 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Aug. 06, 2020 | Aug. 09, 2016
Class of Stock [Line Items] |  |  |  |  |
Proceeds from issuance or sale of equity |  | $ 59,000,000 |  |  |
Shares of common stock sold (in shares) |  | 2,542,594 |  |  |
Commission fees | $ 200,000 | $ 600,000 |  |  |
Available for issuance under ATM program | $ 129,000,000 | $ 129,000,000 |  |  |
Shares of stock acquired (in shares) |  | 2,542,594 |  |  |
2016 ATM Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Aggregate sales price |  |  |  | $ 150,000,000 |
Proceeds from issuance or sale of equity |  | $ 38,000,000 | $ 150,000,000 |  |
Shares of common stock sold (in shares) |  | 1,749,665 |  |  |
2020 ATM Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Aggregate sales price |  |  |  |  | $ 150,000,000
Proceeds from issuance or sale of equity |  | $ 21,000,000 |  |  |
Shares of common stock sold (in shares) |  | 792,929 |  |  |
Clearway Energy LLC |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Ownership interest (as a percentage) |  | 57.58% |  |  |
Clearway Energy LLC | CEG |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Ownership interest (as a percentage) |  | 42.42% |  |  |

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