Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2022

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, 2022 and December 31, 2021 were as follows:

Regulatory Clause	Balance Sheet Line Item	September 30, 2022		December 31, 2021
		(in millions)
Alabama Power
Rate CNP Compliance	Other regulatory liabilities, deferred	$	4	$	—
	Other regulatory assets, deferred	—		16
Rate CNP PPA	Other regulatory assets, deferred	125		84
Retail Energy Cost Recovery(*)	Other regulatory assets, current	93		—
	Other regulatory assets, deferred	413		126
Georgia Power
Fuel Cost Recovery	Deferred under recovered fuel clause revenues	$	1,697	$	410
Mississippi Power
Fuel Cost Recovery	Other customer accounts receivable	$	13	$	4
Ad Valorem Tax	Other regulatory assets, current	12		12
	Other regulatory assets, deferred	22		37
Southern Company Gas
Natural Gas Cost Recovery	Natural gas cost under recovery	$	390	$	266
	Other regulatory assets, deferred	—		207

(*)In accordance with an Alabama PSC order issued on February 1, 2022, Alabama Power applied $126 million of its 2021 Rate RSE refund to reduce the Rate ECR under recovered balance.

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 the end of the first quarter 2023 and the fourth quarter 2023, respectively, is as follows:

	(in millions)
Base project capital cost forecast(a)(b)	$	10,334
Construction contingency estimate	49
Total project capital cost forecast(a)(b)	10,383
Net investment at September 30, 2022(b)	(9,280)
Remaining estimate to complete	$	1,103

(a)Includes approximately $590 million of costs that are not shared with the other Vogtle Owners and approximately $353 million of incremental costs under the cost-sharing and tender provisions of the joint ownership agreements described below. Excludes financing costs expected to be capitalized through AFUDC of approximately $385 million, of which $275 million had been accrued through September 30, 2022.

(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

Georgia Power has requested recovery of the proposed increases through its existing base rate tariffs as follows:

Tariff	2023		2024		2025
	(in millions)
Traditional base	$	762	$	—	$	—
ECCR
Traditional	5		—		—
CCR ARO(a)	64		78		47
DSM(a)	37		27		(2)
Municipal Franchise Fee	21		2		1
Total(b)	$	889	$	107	$	45

(a)As determined by the Georgia PSC through annual compliance filings.

(b)Totals may not add due to rounding.

Capital expenditures incurred under specific infrastructure replacement programs and capital projects during the first nine months of 2022 were as follows:

Utility	Program	Nine Months Ended September 30, 2022
		(in millions)
Nicor Gas	Investing in Illinois	$	311
Virginia Natural Gas	SAVE	52
Atlanta Gas Light	System Reinforcement Rider	51
Chattanooga Gas	Pipeline Replacement Program	2
Total		$	416