Electric plant, construction and related agreements (Tables)

12 Months Ended

Dec. 31, 2023

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, 2023 and 2022 is as follows:

	2023				2022
	(dollars in thousands)
Plant	Investment		Accumulated Depreciation		Investment		Accumulated Depreciation
In-service(1)
Owned property
Vogtle Units No. 1 & No. 2 (Nuclear – 30% ownership)	$	3,035,806	$	(1,948,158)	$	3,024,112	$	(1,916,942)
Vogtle Unit No. 3 (Nuclear – 30% ownership)	4,771,526		(43,418)		58,189		(8,627)
Hatch Units No. 1 & No. 2 (Nuclear – 30% ownership)	1,019,809		(559,001)		991,852		(533,771)
Wansley Units No. 1 & No. 2 (Fossil – 30% ownership)	24,710		(27,152)		20,312		(15,337)
Scherer Unit No. 1 (Fossil – 60% ownership)	1,372,241		(660,580)		1,378,904		(636,799)
Doyle (Combustion Turbine - 100% ownership)	148,902		(127,378)		145,780		(124,306)
Rocky Mountain Units No. 1, No. 2 & No. 3 (Hydro – 75% ownership)	618,955		(308,827)		616,278		(296,624)
Hartwell (Combustion Turbine - 100% ownership)	233,662		(131,434)		232,532		(125,092)
Hawk Road (Combustion Turbine - 100% ownership)	272,416		(79,985)		269,837		(74,685)
Talbot (Combustion Turbine - 100% ownership)	308,837		(167,033)		301,869		(162,137)
Chattahoochee (Combined cycle - 100% ownership)	343,531		(168,292)		324,310		(171,272)
BC Smith (Combined cycle - 100% ownership)	352,005		(126,886)		339,189		(121,318)
TA Smith (Combined cycle - 100% ownership)	689,198		(228,997)		686,517		(208,142)
Washington County (Combustion Turbine – 100% ownership)	171,034		(92,498)		170,432		(88,585)
Baconton (Combustion Turbine – 100% ownership)	32,987		(16,379)		—		—
Transmission plant	122,452		(65,784)		107,992		(64,785)
Other	101,061		(60,710)		106,424		(65,922)
Property under finance lease:
Scherer Unit No. 2 (Fossil – 60% leasehold)	795,698		(606,226)		794,830		(569,245)
Total in-service	$	14,414,830	$	(5,418,738)	$	9,569,359	$	(5,183,589)
Construction work in progress
Vogtle Unit No. 4	$	3,128,720			$	7,583,291

Environmental and other generation improvements	165,921		132,744
Total construction work in progress	$	3,294,641	$	7,716,035

_______________

(1)Amounts include plant acquisition adjustments at December 31, 2023 of $290,725,000 and December 31, 2022 of $280,396,000.

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