REGULATORY MATTERS - MPC Municipal and Rural Associations Tariff (Details) - Mississippi Power $ in Millions	Jul. 15, 2022 USD ($)	Dec. 31, 2022 MW	Aug. 26, 2022	Dec. 31, 2021
Municipal and Rural Associations Tariff
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount | $	$ 23
Cooperative Energy
Public Utilities, General Disclosures [Line Items]
Counterparty's option to decrease services, percentage				2.50%
Power being supplied to counterparty | MW		400
Counterparty's electricity requirement at MRA delivery points			100.00%