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v3.25.1

Expenses Classified by Nature (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Raw materials used | ₩ 21,070,280 | ₩ 27,135,770 | ₩ 34,832,581
Power purchase | 34,659,893 | 38,304,309 | 41,984,858
Salaries | 6,067,385 | 5,515,166 | 5,471,459
Retirement benefit expense | 532,199 | 460,302 | 615,370
Welfare and benefit expense | 697,964 | 695,203 | 695,839
Insurance expense | 161,364 | 147,690 | 127,507
Depreciation | 13,829,464 | 12,864,913 | 12,301,131
Amortization of intangible assets | 163,567 | 163,174 | 156,160
Bad debt expense | 35,232 | 62,808 | 23,634
Commission | 856,953 | 801,768 | 771,947
Advertising expense | 43,564 | 39,161 | 44,291
Training expense | 26,067 | 23,964 | 22,140
Vehicle maintenance expense | 18,634 | 18,172 | 21,024
Publishing expense | 5,607 | 6,160 | 6,746
Business promotion expense | 5,314 | 5,082 | 6,538
Rent expense | 230,832 | 206,556 | 234,119
Telecommunication expense | 19,326 | 17,519 | 17,622
Transportation expense | 53,640 | 103,601 | 114,857
Taxes and dues | 723,189 | 687,066 | 676,497
Expendable supplies expense | 57,427 | 54,504 | 56,776
Water, light and heating expense | 57,189 | 57,407 | 77,952
Repairs and maintenance expense | 2,947,956 | 2,774,262 | 2,739,424
Ordinary development expense | 773,931 | 717,561 | 727,810
Travel expense | 93,569 | 93,497 | 95,061
Clothing expense | 20,515 | 19,940 | 21,822
Survey and analysis expense | 5,253 | 5,224 | 5,448
Membership fee | 17,704 | 16,667 | 18,381
Others | 1,860,168 | 1,763,663 | 2,046,022
Total expenses, by nature | 85,034,186 | 92,761,109 | 103,913,016
Selling and administrative expense |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Raw materials used | 0 | 0 | 0
Power purchase | 0 | 0 | 0
Salaries | 1,180,379 | 1,098,460 | 1,142,360
Retirement benefit expense | 104,036 | 89,533 | 109,758
Welfare and benefit expense | 151,840 | 152,836 | 155,781
Insurance expense | 30,460 | 27,726 | 20,835
Depreciation | 231,114 | 241,533 | 244,676
Amortization of intangible assets | 88,920 | 88,648 | 85,661
Bad debt expense | 35,232 | 62,808 | 23,634
Commission | 429,977 | 460,644 | 420,390
Advertising expense | 32,205 | 30,305 | 33,739
Training expense | 8,911 | 7,900 | 7,327
Vehicle maintenance expense | 9,218 | 9,044 | 10,749
Publishing expense | 2,857 | 3,281 | 3,732
Business promotion expense | 2,687 | 2,559 | 3,198
Rent expense | 48,474 | 44,807 | 47,680
Telecommunication expense | 9,406 | 7,813 | 7,945
Transportation expense | 1,108 | 1,099 | 1,012
Taxes and dues | 98,714 | 112,449 | 122,177
Expendable supplies expense | 6,976 | 7,252 | 9,617
Water, light and heating expense | 15,009 | 16,207 | 17,950
Repairs and maintenance expense | 197,942 | 154,062 | 152,449
Ordinary development expense | 217,975 | 217,319 | 213,932
Travel expense | 18,726 | 16,265 | 16,062
Clothing expense | 11,216 | 10,450 | 13,044
Survey and analysis expense | 871 | 1,068 | 1,126
Membership fee | 1,709 | 1,503 | 1,469
Others | 134,064 | 196,011 | 143,119
Total expenses, by nature | 3,070,026 | 3,061,582 | 3,009,422
Cost of sales |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Raw materials used | 21,070,280 | 27,135,770 | 34,832,581
Power purchase | 34,659,893 | 38,304,309 | 41,984,858
Salaries | 4,887,006 | 4,416,706 | 4,329,099
Retirement benefit expense | 428,163 | 370,769 | 505,612
Welfare and benefit expense | 546,124 | 542,367 | 540,058
Insurance expense | 130,904 | 119,964 | 106,672
Depreciation | 13,598,350 | 12,623,380 | 12,056,455
Amortization of intangible assets | 74,647 | 74,526 | 70,499
Bad debt expense | 0 | 0 | 0
Commission | 426,976 | 341,124 | 351,557
Advertising expense | 11,359 | 8,856 | 10,552
Training expense | 17,156 | 16,064 | 14,813
Vehicle maintenance expense | 9,416 | 9,128 | 10,275
Publishing expense | 2,750 | 2,879 | 3,014
Business promotion expense | 2,627 | 2,523 | 3,340
Rent expense | 182,358 | 161,749 | 186,439
Telecommunication expense | 9,920 | 9,706 | 9,677
Transportation expense | 52,532 | 102,502 | 113,845
Taxes and dues | 624,475 | 574,617 | 554,320
Expendable supplies expense | 50,451 | 47,252 | 47,159
Water, light and heating expense | 42,180 | 41,200 | 60,002
Repairs and maintenance expense | 2,750,014 | 2,620,200 | 2,586,975
Ordinary development expense | 555,956 | 500,242 | 513,878
Travel expense | 74,843 | 77,232 | 78,999
Clothing expense | 9,299 | 9,490 | 8,778
Survey and analysis expense | 4,382 | 4,156 | 4,322
Membership fee | 15,995 | 15,164 | 16,912
Others | 1,726,104 | 1,567,652 | 1,902,903
Total expenses, by nature | ₩ 81,964,160 | ₩ 89,699,527 | ₩ 100,903,594

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- Definition The amount of raw materials and consumables used in the production process or in the rendering of services. [Refer: Current raw materials] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_102&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_99&doctype=Standard -URIDate 2024-03-27 + Details
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