Electric plant, construction and related agreements (Tables)

12 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

Summary of plant investments and related accumulated depreciation

A summary of our plant investments and related accumulated depreciation as of December 31, 2024 and 2023 is as follows:

	2024				2023
	(dollars in thousands)
Plant	Investment		Accumulated Depreciation		Investment		Accumulated Depreciation
In-service(1)
Owned property
Vogtle Units No. 1 & No. 2 (Nuclear – 30% ownership)	$	2,941,737	$	(1,958,308)	$	3,035,806	$	(1,948,158)
Vogtle Units No. 3 and No. 4 (Nuclear – 30% ownership)(2,3)	7,966,038		(153,949)		4,771,526		(43,418)
Hatch Units No. 1 & No. 2 (Nuclear – 30% ownership)	912,629		(558,916)		1,019,809		(559,001)
Wansley Units No. 1 & No. 2 (Fossil – 30% ownership)	26,603		(23,344)		24,710		(27,152)
Scherer Unit No. 1 (Fossil – 60% ownership)	1,369,982		(690,307)		1,372,241		(660,580)
Doyle (Combustion Turbine - 100% ownership)	151,697		(130,479)		148,902		(127,378)
Rocky Mountain Units No. 1, No. 2 & No. 3 (Hydro – 75% ownership)	619,581		(319,528)		618,955		(308,827)
Hartwell (Combustion Turbine - 100% ownership)	239,570		(134,649)		233,662		(131,434)
Hawk Road (Combustion Turbine - 100% ownership)	277,099		(84,004)		272,416		(79,985)
Talbot (Combustion Turbine - 100% ownership)	310,826		(172,890)		308,837		(167,033)
Chattahoochee (Combined cycle - 100% ownership)	354,570		(172,094)		343,531		(168,292)
BC Smith (Combined cycle - 100% ownership)	413,829		(119,228)		352,005		(126,886)

	2024				2023
	(dollars in thousands)
Plant	Investment		Accumulated Depreciation		Investment		Accumulated Depreciation
TA Smith (Combined cycle - 100% ownership)	702,383		(243,554)		689,198		(228,997)
Washington County (Combustion Turbine – 100% ownership)	171,937		(94,418)		171,034		(92,498)
Baconton (Combustion Turbine – 100% ownership)	33,910		(16,900)		32,987		(16,379)
Walton County (Combustion Turbine – 100% ownership)	121,718		(43,697)		—		—
Transmission plant	173,183		(77,295)		122,452		(65,784)
Other	103,785		(64,004)		101,061		(60,710)
Property under finance lease:
Scherer Unit No. 2 (Fossil – 60% leasehold)	800,131		(644,063)		795,698		(606,226)
Total in-service	$	17,691,208	$	(5,701,627)	$	14,414,830	$	(5,418,738)
Construction work in progress	2024				2023
Hatch Units No. 1 & No. 2 (Nuclear – 30% ownership)	$	29,563			$	42,825
Scherer Unit No. 1 (Fossil – 60% ownership)	42,774				16,077
Vogtle Units No. 1 & No. 2 (Nuclear – 30% ownership)	22,842				27,368
Vogtle Units No. 3 and No. 4 (Nuclear – 30% ownership)(2,3)	10,623				3,128,720
Wansley Units No. 1 & No. 2 (Fossil – 30% ownership)	152				46
Environmental and other generation improvements	214,213				79,605
Total construction work in progress	$	320,167			$	3,294,641

__________________

(1)Amounts include plant acquisition adjustments at December 31, 2024 of $330,730,000 and December 31, 2023 of $290,725,000.

(2)Plant Vogtle Unit No. 3 was placed in service on July 31, 2023.

(3)Plant Vogtle Unite No. 4 was placed in service on April 29, 2024.