Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2022 and December 31, 2021 were as follows:

Regulatory Clause	Balance Sheet Line Item	March 31, 2022		December 31, 2021
		(in millions)
Alabama Power
Rate CNP Compliance	Other regulatory assets, deferred	$	12	$	16
Rate CNP PPA	Other regulatory assets, deferred	84		84
Retail Energy Cost Recovery(*)	Other regulatory assets, deferred	46		126
Georgia Power
Fuel Cost Recovery	Deferred under recovered fuel clause revenues	$	494	$	410
Mississippi Power
Fuel Cost Recovery	Other customer accounts receivable	$	16	$	4
Ad Valorem Tax	Other regulatory assets, current	12		12
	Other regulatory assets, deferred	33		37
Southern Company Gas
Natural Gas Cost Recovery	Natural gas cost under recovery	$	306	$	266
	Other regulatory assets, deferred	44		207
	Other regulatory liabilities, current	13		—

(*)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)	$	10,294
Construction contingency estimate	107
Total project capital cost forecast(a)(b)	10,401
Net investment at March 31, 2022(b)	(8,715)
Remaining estimate to complete	$	1,686

(a)Includes approximately $590 million of costs that are not shared with the other Vogtle Owners and approximately $440 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 $377 million, of which $221 million had been accrued through March 31, 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

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

Utility	Program	Three Months Ended March 31, 2022
		(in millions)
Nicor Gas	Investing in Illinois	$	51
Virginia Natural Gas	Steps to Advance Virginia's Energy	14
Atlanta Gas Light	System Reinforcement Rider	14
Chattanooga Gas	Pipeline Replacement Program	1
Total		$	80