Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2023

Regulated Operations [Abstract]

Schedule of Cost Recovery Clauses

The recovery balances for certain retail regulatory clauses of the traditional electric operating companies and Southern Company Gas at September 30, 2023 and December 31, 2022 were as follows:

Regulatory Clause	Balance Sheet Line Item	September 30, 2023		December 31, 2022
		(in millions)
Alabama Power
Rate CNP Compliance	Other regulatory liabilities, deferred	$	3	$	—
	Other regulatory assets, current	—		47
Rate CNP PPA	Other regulatory assets, current	17		18
	Other regulatory assets, deferred	90		102
Retail Energy Cost Recovery	Other regulatory assets, current	208		102
	Other regulatory assets, deferred	80		520
Georgia Power
Fuel Cost Recovery(*)	Receivables – under recovered fuel clause revenues	$	730	$	—
	Deferred under recovered fuel clause revenues	1,279		2,056
Mississippi Power
Fuel Cost Recovery	Receivables – customer accounts, net	$	25	$	1
Ad Valorem Tax	Other regulatory assets, current	3		12
	Other regulatory assets, deferred	11		19
Southern Company Gas
Natural Gas Cost Recovery	Natural gas cost under recovery	$	—	$	108
	Natural gas cost over recovery	165		—

(*)See "Georgia Power – Fuel Cost Recovery" herein for additional information.

Nuclear Construction Cost and Schedule

Georgia Power's approximate proportionate share of the remaining estimated capital cost to complete Plant Vogtle Units 3 and 4, including contingency, through July 2023 and March 2024, respectively, is as follows:

	(in millions)
Base project capital cost forecast(a)(b)	$	10,736
Construction contingency estimate	17
Total project capital cost forecast(a)(b)	10,753
Net investment at September 30, 2023(b)	(10,495)
Remaining estimate to complete	$	258

(a)Includes approximately $610 million of costs that are not shared with the other Vogtle Owners, including $33 million of construction monitoring costs approved for recovery by the Georgia PSC in its nineteenth VCM order, and approximately $567 million of incremental costs under the cost-sharing provisions of the joint ownership agreements described below. Excludes financing costs expected to be capitalized through AFUDC of approximately $420 million, of which $385 million had been accrued through September 30, 2023.

(b)Net of $1.7 billion received from Toshiba under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds.

Schedule of Infrastructure Replacement Programs and Capital Projects

Capital expenditures incurred under specific infrastructure replacement programs and capital projects during the first nine months of 2023 were as follows:

Utility	Program	Nine Months Ended September 30, 2023
		(in millions)
Nicor Gas	Investing in Illinois	$	320
Virginia Natural Gas	SAVE	56
Atlanta Gas Light	System Reinforcement Rider	84
Chattanooga Gas	Pipeline Replacement Program	7
Total		$	467