Intangible Assets other than Goodwill (Tables)

12 Months Ended

Dec. 31, 2022

Disclosure of detailed information about intangible assets [abstract]

(1)	Intangible assets as of December 31, 2021 and 2022 are as follows:


		2021
		Acquisition cost		Government grants			Accumulated amortization			Accumulated impairment losses			Book value

		In millions of won
Software	￦		867,185		(91	)		(704,589	)		—			162,505
Copyrights, patents rights and other industrial rights			103,428		—			(59,063	)		(9,178	)		35,187
Mining rights			623,122		—			(39,803	)		(541,417	)		41,902
Development expenditures			978,768		(3,820	)		(905,805	)		(19	)		69,124
Intangible assets under development			94,275		(7,326	)		—			(12,845	)		74,104
Usage rights of donated assets and others			592,870		—			(423,087	)		—			169,783
Leasehold rights			28,185		—			(22,337	)		—			5,848
Greenhouse gas emissions rights			78,137		—			—			—			78,137
Others			574,957		(71	)		(155,404	)		(11,995	)		407,487

	￦		3,940,927		(11,308	)		(2,310,088	)		(575,454	)		1,044,077


		2022
		Acquisition cost		Government grants			Accumulated amortization			Accumulated impairment losses			Book value

		In millions of won
Software	￦		1,002,040		(174	)		(799,013	)		(20	)		202,833
Copyrights, patents rights and other industrial rights			104,559		—			(67,368	)		(9,178	)		28,013
Mining rights			625,845		—			(46,187	)		(541,133	)		38,525
Development expenditures			938,032		(3,477	)		(883,527	)		—			51,028
Intangible assets under development			76,625		(2,108	)		—			(8,903	)		65,614
Usage rights of donated assets and others			592,797		—			(435,518	)		(136	)		157,143
Leasehold rights			28,185		—			(23,297	)		—			4,888
Greenhouse gas emissions rights			43,960		—			—			—			43,960
Others			551,396		(67	)		(174,714	)		(11,955	)		364,660

	￦		3,963,439		(5,826	)		(2,429,624	)		(571,325	)		956,664

Summary of Changes in Intangible Assets

(2)	Changes in intangible assets for the years ended December 31, 2021 and 2022 are as follows:


		2021
		Beginning balance			Acquisition		Disposal			Amortization			Reversal		Others			Ending balance

		In millions of won
Software	￦		152,163			18,834		(1	)		(77,881	)		—		69,481			162,596
(Government grants)			(136	)		—		—			64			—		(19	)		(91	)
Copyrights, patents rights and other industrial rights			42,916			166		(131	)		(7,771	)		—		7			35,187
Mining rights			42,390			1,022		—			(3,526	)		—		2,016			41,902
Development expenditures			95,166			309		—			(37,033	)		—		14,502			72,944
(Government grants)			(5,043	)		—		—			1,439			—		(216	)		(3,820	)
Intangible assets under development			67,018			51,988		—			—			—		(37,576	)		81,430
(Government grants)			(7,203	)		—		—			—			—		(123	)		(7,326	)
Usage rights of donated assets and others			184,475			—		—			(13,594	)		—		(1,098	)		169,783
Leasehold rights			6,340			—		—			(834	)		—		342			5,848
Greenhouse gas emissions rights			61,373			78,091		—			(31	)		—		(61,296	)		78,137
Others			416,346			2,229		—			(26,998	)		14		15,967			407,558
(Government grants)			(75	)		—		—			4			—		—			(71	)

	￦		1,055,730			152,639		(132	)		(166,161	)		14		1,987			1,044,077


		2022
		Beginning balance			Acquisition		Disposal			Amortization			Impairment			Others			Ending balance

		In millions of won
Software	￦		162,596			22,532		(57	)		(84,649	)		—			102,585			203,007
(Government grants)			(91	)		—		—			60			—			(143	)		(174	)
Copyrights, patents rights and other industrial rights			35,187			270		(37	)		(7,136	)		—			(271	)		28,013
Mining rights			41,902			2,395		—			(4,296	)		—			(1,476	)		38,525
Development expenditures			72,944			—		—			(24,238	)		—			5,799			54,505
(Government grants)			(3,820	)		—		—			1,466			—			(1,123	)		(3,477	)
Intangible assets under development			81,430			39,559		—			—			(14	)		(53,253	)		67,722
(Government grants)			(7,326	)		—		—			—			—			5,218			(2,108	)
Usage rights of donated assets and others			169,783			—		—			(11,394	)		(150	)		(1,096	)		157,143
Leasehold rights			5,848			—		—			(960	)		—			—			4,888
Greenhouse gas emissions rights			78,137			57,466		—			—			—			(91,643	)		43,960
Others			407,558			4,073		(260	)		(25,017	)		—			(21,627	)		364,727
(Government grants)			(71	)		—		—			4			—			—			(67	)

	￦		1,044,077			126,295		(354	)		(156,160	)		(164	)		(57,030	)		956,664

Summary of Significant Specific Intangible Assets

(3)	Significant specific intangible assets as of December 31, 2021 and 2022 are as follows:


2021
Type	Description	Currency	Amount		Remaining useful lives

	In millions of won and thousands of Australian dollars
Software	DAS MS-SQL CORE license	KRW		3,817	2 years and 8 months
Copyrights, patents rights and other industrial rights	Smart technology verification and standard design project conducting right	KRW		1,851	9 months
	Contributions to AP R NRC DC	KRW		25,045	6 years
Mining rights	Mining rights of Bylong mine	AUD		—	— (*)
Usage rights of donated assets and others	Sejong Haengbogdosi sharing charge	KRW		22,310	4 years and 11 months
	Right of use electricity and gas supply facility (Community district of Songdo)	KRW		8,962	8 years and 6 months
Others	Occupancy and use of public waters	KRW		81,623	15 years and 1 month
	Greenhouse gas emissions rights	KRW		78,137	—
	Business rights	KRW		160,459	27 years and 11 months

(*) The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full.


2022
Type	Description	Currency	Amount		Remaining useful lives

	In millions of won and thousands of Australian dollars
Software	ORACLE license for SDIS integrated DB	KRW		5,509	3 years and 4 months
Copyrights, patents rights and other industrial rights	Contributions to APR NRC DC	KRW		20,871	5 years
Mining rights	Mining rights of Bylong mine	AUD		—	— (*)
Usage rights of donated assets and others	Sejong Haengbogdosi sharing charge	KRW		17,772	3 years and 11 months
	Right of use electricity and gas supply facility (Community district of Songdo)	KRW		7,908	7 years and 6 months
Others	Occupancy and use of public waters	KRW		76,212	14 years and 1 month
	Greenhouse gas emissions rights	KRW		43,960	—
	Business rights	KRW		154,712	26 years and 11 months

(*)	The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full.

Summary of Recognized Research and Development Expenses

(4)	For the years ended December 31, 2020, 2021 and 2022, the Company recognized research and development expenses of ￦ 700,642 million, ￦ 689,397 million and ￦ 727,810 million, respectively.