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Segment, Geographic and Other Information (Tables)

12 Months Ended

Dec. 31, 2023

Disclosure of operating segments [abstract]

Summary of Financial Information of the Segments

(2)	Financial information of the segments for the years ended December 31, 2021, 2022 and 2023, respectively, are as follows:


		2021
Segment		Total segment revenue			Intersegment revenue			Revenue from external customers		Depreciation and amortization			Interest income			Interest expense			Profit (loss) related to associates, joint ventures and subsidiaries			Employee benefit expense			Loss on abandonment of property, plant and equipment		Increase in provisions, net			Operating profit (loss)
		In millions of won
Transmission and distribution	￦		58,999,388			1,672,776			57,326,612		3,990,464			36,831			678,986			391,116			193,412			202,262		1,194,643			(7,244,319	)
Electric power generation (Nuclear)			9,324,391			9,207,516			116,875		3,611,594			22,209			477,512			(18,146	)		86,730			—		680,358			762,164
Electric power generation (Non-nuclear)			25,928,596			24,518,167			1,410,429		4,182,470			22,226			624,391			109,765			121,020			5,672		285,152			370,440
Plant maintenance & engineering service			2,805,785			2,370,900			434,885		121,493			9,515			933			11,849			94,269			—		213,500			245,360
Others			2,018,997			1,295,423			723,574		159,222			158,680			162,345			—			52,698			—		2,981			208,139
Consolidation adjustments			(39,064,782	)		(39,064,782	)		—		(122,751	)		(27,587	)		(29,710	)		—			(36,187	)		—		89,818			(64,775	)

	￦		60,012,375			—			60,012,375		11,942,492			221,874			1,914,457			494,584			511,942			207,934		2,466,452			(5,722,991	)

Finance income																															1,402,614

Finance expense																															(3,245,777	)

Gain related to associates, joint ventures and subsidiaries																															494,584

Loss before income tax																													￦		(7,071,570	)


		2022
Segment		Total segment revenue			Intersegment revenue			Revenue from external customers		Depreciation and amortization			Interest income			Interest expense			Profit (loss) related to associates, joint ventures and subsidiaries			Employee benefit expense			Loss on abandonment of property, plant and equipment		Increase in provisions, net			Operating profit (loss)
		In millions of won
Transmission and distribution	￦		68,239,707			1,922,354			66,317,353		4,130,004			67,076			1,420,802			980,146			180,114			157,784		611,534			(33,623,874	)
Electric power generation (Nuclear)			10,386,091			10,254,271			131,820		4,034,774			45,789			557,218			(753	)		82,466			—		624,221			761,109
Electric power generation (Non-nuclear)			41,944,339			39,252,851			2,691,488		4,091,081			53,242			694,559			329,112			140,067			—		619,947			289,001
Plant maintenance & engineering service			2,975,062			2,516,699			458,363		123,168			14,003			1,405			1,886			82,070			—		213,671			239,529
Others			2,750,231			1,803,231			947,000		211,719			195,966			195,860			—			53,017			3,125		9,463			333,547
Consolidation adjustments			(55,749,406	)		(55,749,406	)		—		(129,334	)		(35,323	)		(51,298	)		—			(52,034	)		—		68,143			(239,843	)

	￦		70,546,024			—			70,546,024		12,461,412			340,753			2,818,546			1,310,391			485,700			160,909		2,146,979			(32,240,531	)

Finance income																															1,833,312

Finance expense																															(4,746,791	)

Gain related to associates, joint ventures and subsidiaries																															1,310,391

Loss before income tax																													￦		(33,843,619	)


		2023
Segment		Total segment revenue			Intersegment revenue			Revenue from external customers		Depreciation and amortization			Interest income			Interest expense			Profit (loss) related to associates, joint ventures and subsidiaries			Employee benefit expense			Loss on abandonment of property, plant and equipment		Increase in provisions, net			Operating profit (loss)
		In millions of won
Transmission and distribution	￦		85,082,542			1,728,602			83,353,940		4,258,909			92,380			2,826,916			314,373			127,038			182,742		419,564			(6,153,936	)
Electric power generation (Nuclear)			10,798,378			10,666,260			132,118		4,403,610			69,209			687,743			(2,639	)		62,280			—		585,630			819,838
Electric power generation (Non-nuclear)			35,159,641			32,253,979			2,905,662		4,180,939			65,403			741,282			301,681			109,151			13,863		352,058			929,210
Plant maintenance & engineering service			3,091,022			2,626,190			464,832		129,628			23,638			1,270			(389	)		52,890			—		206,215			355,284
Others			2,175,972			1,556,114			619,858		204,322			226,243			258,877			—			48,105			92		444			89,302
Consolidation adjustments			(48,831,145	)		(48,831,145	)		—		(145,145	)		(47,253	)		(64,429	)		—			(40,734	)		—		47,171			(284,714	)

	￦		87,476,410			—			87,476,410		13,032,263			429,620			4,451,659			613,026			358,730			196,697		1,611,082			(4,245,016	)

Finance income																															1,425,031

Finance expense																															(5,347,018	)

Gain related to associates, joint ventures and subsidiaries																															613,026

Loss before income tax																													￦		(7,553,977	)

Summary of Information Related to Segment Assets and Liabilities

(3)	Information related to segment assets and segment liabilities as of and for the years ended December 31, 2022 and 2023 are as follows:


		2022
Segment		Segment assets			Investments in associates and joint ventures		Acquisition of non-current assets			Segment liabilities
		In millions of won
Transmission and distribution	￦		131,023,727			5,678,141		6,055,179			108,963,058
Electric power generation (Nuclear)			69,129,625			143,304		2,008,409			42,843,974
Electric power generation (Non-nuclear)			69,468,039			3,113,918		3,547,815			40,428,907
Plant maintenance & engineering service			4,051,157			56,685		200,338			1,272,408
Others			12,895,981			—		839,885			5,796,718

Segment totals			286,568,529			8,992,048		12,651,626			199,305,065

Consolidation adjustments:
Elimination of inter-segment amounts			(43,801,723	)		—		(38,633	)		(9,304,648	)
Equity method adjustment			2,859,623			—		—			—
Deferred taxes			(452	)		—		—			2,801,832
Others			(10,820,983	)		—		—			2,489

			(51,763,535	)		—		(38,633	)		(6,500,327	)

Consolidated totals	￦		234,804,994			8,992,048		12,612,993			192,804,738


		2023
Segment		Segment assets			Investments in associates and joint ventures		Acquisition of non-current assets			Segment liabilities
		In millions of won
Transmission and distribution	￦		138,838,342			5,872,000		7,636,677			120,181,250
Electric power generation (Nuclear)			70,535,018			169,155		3,070,528			45,660,916
Electric power generation (Non-nuclear)			66,265,884			3,567,345		3,490,863			38,415,202
Plant maintenance & engineering service			4,271,409			54,088		203,352			1,549,863
Others			13,378,229			—		736,155			6,480,959

Segment totals			293,288,882			9,662,588		15,137,575			212,288,190

Consolidation adjustments:
Elimination of inter-segment amounts			(46,071,077	)		—		(390,686	)		(11,463,805	)
Equity method adjustment			2,997,016			—		—			—
Deferred taxes			1,636			—		—			1,629,280
Others			(10,501,492	)		—		—			(3,450	)

			(53,573,917	)		—		(390,686	)		(9,837,975	)

Consolidated totals	￦		239,714,965			9,662,588		14,746,889			202,450,215

Summary of Geographic Information

(4)	Geographic information

Electricity sales, the main operations of the Company, are conducted in the Republic of Korea. The following information on revenue from external customers and non-current assets is determined by the location of the customers and of the assets:


		Revenue from external customers						Non-current assets (*2)
Geographical unit		2021		2022		2023		2021		2022		2023
		In millions of won
Domestic	￦		58,771,252		69,142,730		86,242,808		178,760,564		183,707,117		186,384,115
Overseas (*1)			1,241,123		1,403,294		1,233,602		3,572,784		4,724,416		4,822,845

	￦		60,012,375		70,546,024		87,476,410		182,333,348		188,431,533		191,206,960

(*1)

Middle East and other Asian countries make up the majority of overseas revenue and non-current assets. Since the overseas revenue or non-current

asse

ts attributable to particular countries are not material, they are not disclosed individually.

(*2)

The amounts exclude financial assets and deferred tax assets.