Acquisitions and Dispositions - Schedule of Construction Projects (Details) - SOUTHERN POWER CO - MW |
1 Months Ended | 3 Months Ended | |||||
|---|---|---|---|---|---|---|---|
May 31, 2019 |
Jun. 30, 2020 |
Dec. 31, 2019 |
Jun. 30, 2019 |
May 04, 2019 |
Aug. 31, 2018 |
May 31, 2018 |
|
| Mankato expansion | |||||||
| Business Acquisition [Line Items] | |||||||
| Approximate Nameplate Capacity (MW) | 385 | 385 | 385 | ||||
| PPA Contract Period | 20 years | ||||||
| Wild Horse Mountain | Wild Horse Mountain | |||||||
| Business Acquisition [Line Items] | |||||||
| Ownership percentage by parent | 100.00% | ||||||
| Reading | Reading | |||||||
| Business Acquisition [Line Items] | |||||||
| Ownership percentage by parent | 100.00% | ||||||
| Reading | Reading | Class B Membership Interest | |||||||
| Business Acquisition [Line Items] | |||||||
| Ownership percentage by parent | 100.00% | ||||||
| Scenario, Forecast | Wild Horse Mountain | |||||||
| Business Acquisition [Line Items] | |||||||
| Approximate Nameplate Capacity (MW) | 100 | ||||||
| PPA Contract Period | 20 years | ||||||
| Scenario, Forecast | Reading | |||||||
| Business Acquisition [Line Items] | |||||||
| Approximate Nameplate Capacity (MW) | 200 | ||||||
| PPA Contract Period | 12 years | ||||||