REGULATORY MATTERS - GPC Joint Owner Contracts (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 31, 2023	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]
Agreement with third party, amount of costs over projected forecast to be paid by company					20.00%
Georgia Power
Public Utilities, General Disclosures [Line Items]
Pre-tax charge to income		$ 7.6		$ 567.0
After tax charge to income		$ 5.7		$ 424.0
Plant Vogtle Units 3 and 4 \| Georgia Power
Public Utilities, General Disclosures [Line Items]
Remaining share of construction costs, agreement to pay, percentage	66.00%
Pre-tax charge to income			$ 228.0
After tax charge to income			$ 170.0
Plant Vogtle Units 3 and 4 \| Georgia Power \| MEAG Power
Public Utilities, General Disclosures [Line Items]
Agreement with third party, expected cost					$ 91.0
Plant Vogtle Units 3 and 4 \| Georgia Power \| Oglethorpe Power Corporation
Public Utilities, General Disclosures [Line Items]
Agreement with third party, expected cost	$ 99.0
Plant Vogtle Units 3 and 4 \| Georgia Power \| Dalton Utilities
Public Utilities, General Disclosures [Line Items]
Agreement with third party, expected cost	$ 5.3