Regulatory Matters - APC Plant Greene County (Details) - Subsequent Event	Apr. 26, 2024 MW
MISSISSIPPI POWER CO | Plant Greene County Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Proportionate ownership share	40.00%
Required fossil-stream generation retirements (in MWs)	206
MISSISSIPPI POWER CO | Plant Watson Unit 4
Public Utilities, General Disclosures [Line Items]
Required fossil-stream generation retirements (in MWs)	268
MISSISSIPPI POWER CO | Plant Daniel Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Proportionate ownership share	50.00%
Required fossil-stream generation retirements (in MWs)	502
ALABAMA POWER CO | Plant Greene County Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Proportionate ownership share	60.00%
Required fossil-stream generation retirements (in MWs)	300