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Consolidated Statements of Cash Flows - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities |  |  |
Profit (loss) for the year | ₩ (5,229,225) | ₩ 2,092,469 | ₩ (2,263,535)
Adjustments to reconcile profit (loss) for the year to net cash provided by operating activities: |  |  |
Income tax expense (benefit) | (1,855,989) | 899,064 | (1,002,303)
Depreciation | 11,772,111 | 11,377,553 | 10,971,825
Amortization | 166,161 | 170,466 | 156,915
Employee benefit expense | 511,942 | 492,288 | 725,120
Bad debt expense | 67,242 | 50,686 | 16,629
Interest expense | 1,914,457 | 1,995,425 | 2,046,811
Loss on disposal of financial assets | 1,045 | 648 | 2,106
Loss on disposal of property, plant and equipment | 92,622 | 162,725 | 72,508
Loss on abandonment of property, plant and equipment | 207,934 | 255,346 | 364,233
Loss on impairment of property, plant and equipment | 4,056 | 80,413 | 50,034
Loss on impairment of intangible assets | 0 | 3,599 | 513,609
Loss on disposal of intangible assets | 145 | 392 | 827
Increase in provisions | 2,466,452 | 1,832,765 | 2,301,215
Loss (gain) on foreign currency translation, net | 997,119 | (782,167) | 370,309
Gain on valuation of financial assets at fair value through profit or loss | (14,338) | (12,904) | (5,575)
Loss on valuation of financial assets at fair value through profit or loss | 5,480 | 7,396 | 4,513
Valuation and transaction loss (gain) on derivative instruments, net | (907,076) | 390,322 | (403,765)
Share in profit of associates and joint ventures, net | (557,056) | (279,124) | (166,820)
Gain on disposal of financial assets | (7,718) | (11,992) | (3,866)
Reversal of impairment loss on intangible assets | (14) | 0 | 0
Gain on disposal of property, plant and equipment | (56,284) | (93,195) | (43,784)
Gain on disposal of intangible assets | (1) | (1,556) | (206)
Gain on disposal of investments in associates and joint ventures | (1,844) | (10,165) | (70,094)
Loss on disposal of investments in associates and joint ventures | 64,119 | 16 | 2
Impairment loss on investments in associates and joint ventures | 0 | 1,556 | 22,517
Loss on disposal of investments in subsidiaries | 197 | 6,610 | 256
Interest income | (221,874) | (242,586) | (268,118)
Dividend income | (10,522) | (7,316) | (13,838)
Others, net | (169,856) | 30,411 | 128,237
Adjustments for Cash flows from operating activities | 14,468,510 | 16,316,676 | 15,769,297
Changes in working capital: |  |  |
Trade receivables | (216,734) | (107,639) | 95,345
Non-trade receivables | 869,870 | 459,524 | 64,027
Accrued income | (17,918) | (258,963) | 83,589
Other receivables | 24,306 | (32,536) | (116,583)
Other current assets | (569,732) | (462,125) | (271,986)
Inventories | (1,738,000) | (723,495) | (980,216)
Other non-current assets | (3,462) | (140,017) | (611,066)
Trade payables | 2,144,561 | (262,985) | (546,159)
Non-trade payables | (571,051) | (363,260) | 192,506
Accrued expenses | (456,992) | (222,113) | (454,501)
Other current liabilities | 379,378 | 388,163 | 373,403
Other non-current liabilities | 458,007 | 755,005 | 650,468
Investments in associates and joint ventures (dividends received) | 288,242 | 237,695 | 215,612
Provisions | (2,426,017) | (1,499,436) | (1,473,461)
Payments of employee benefit obligations | (159,477) | (74,848) | (65,242)
Plan assets | (317,707) | (582,275) | (348,386)
Changes in working capital | (2,312,726) | (2,889,305) | (3,192,650)
Cash generated from operating activities | 6,926,559 | 15,519,840 | 10,313,112
Dividends received (financial assets at fair value through other comprehensive income) | 10,522 | 7,316 | 24,255
Interest paid | (1,928,160) | (2,081,663) | (2,027,850)
Interest received | 201,022 | 215,183 | 186,122
Income taxes paid | (736,757) | (452,203) | (282,211)
Net cash provided by operating activities | 4,473,186 | 13,208,473 | 8,213,428
Cash flows from investing activities |  |  |
Proceeds from disposals of investments in associates and joint ventures | 4,472 | 5,444 | 0
Acquisition of investments in associates and joint ventures | (673,017) | (342,116) | (107,821)
Proceeds from disposals of property, plant and equipment | 277,998 | 331,777 | 522,742
Acquisition of property, plant and equipment | (12,668,534) | (13,281,294) | (14,000,359)
Proceeds from disposals of intangible assets | 59 | 10,871 | 7,702
Acquisition of intangible assets | (113,100) | (120,371) | (229,426)
Proceeds from disposals of financial assets | 7,023,674 | 8,020,406 | 2,783,474
Acquisition of financial assets | (5,893,404) | (9,203,450) | (2,165,342)
Increase in loans | (223,950) | (336,744) | (335,773)
Collection of loans | 218,704 | 215,292 | 292,745
Increase in deposits | (222,924) | (276,255) | (280,637)
Decrease in deposits | 166,066 | 280,941 | 275,314
Proceeds from disposals of assets held-for-sale | 1,148 | 32,578 | 30,662
Receipt of government grants | 37,920 | 41,209 | 21,705
Cash outflow from merger | 0 | 0 | (154,311)
Net cash outflow from changes in consolidation scope | (63,492) | (24,624) | (2,917)
Other cash outflow from investing activities, net | (225,948) | (185,475) | (157,116)
Net cash used in investing activities | (12,354,328) | (14,831,811) | (13,499,358)
Cash flows from financing activities |  |  |
Proceeds from short-term borrowings, net | 1,621,440 | 345,338 | 188,957
Proceeds from long-term borrowings and debt securities | 17,392,311 | 10,170,107 | 13,221,407
Repayment of long-term borrowings and debt securities | (9,360,357) | (7,976,658) | (7,068,290)
Payment of lease liabilities | (572,036) | (613,977) | (573,437)
Settlement of derivative instruments, net | 98,068 | 42,263 | 102,146
Change in non-controlling interests | 90,096 | 11,554 | 17,365
Dividends paid (hybrid bond) | (13,385) | (13,385) | (13,385)
Dividends paid | (812,159) | (81,298) | (99,356)
Other cash outflow from financing activities, net | (8,901) | (3,120) | 0
Net cash provided by financing activities | 8,435,077 | 1,880,824 | 5,775,407
Net increase in cash and cash equivalents before effect of exchange rate fluctuations | 553,935 | 257,486 | 489,477
Effect of exchange rate fluctuations on cash held | 51,719 | (38,031) | (37,693)
Net increase in cash and cash equivalents | 605,654 | 219,455 | 451,784
Cash and cash equivalents at January 1 | 2,029,584 | 1,810,129 | 1,358,345
Cash and cash equivalents at December 31 | ₩ 2,635,238 | ₩ 2,029,584 | ₩ 1,810,129

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- Definition The effect of exchange rate changes on cash and cash equivalents held or due in a foreign currency. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 28 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_28&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash inflow from the disposal of non-current assets or disposal groups classified as held for sale and discontinued operations. [Refer: Discontinued operations [member]; Disposal groups classified as held for sale [member]; Non-current assets or disposal groups classified as held for sale] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash inflow from government grants, classified as investing activities. [Refer: Government [member]; Government grants] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 20 -IssueDate 2021-01-01 -Paragraph 28 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=20&code=ifrs-tx-2021-en-r&anchor=para_28&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash inflow from sales of intangible assets, classified as investing activities. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 16 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash inflow from sales or maturity of financial instruments, classified as investing activities. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Adjustment for gains on disposal of intangible assets. + References No definition available. + Details
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- Definition Adjustment for gains on disposal of property plant and equipment. + References No definition available. + Details
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- Definition Adjustment for impairment loss on investments in associates and joint ventures. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Adjustment for investments in associates and joint ventures. + References No definition available. + Details
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- Definition Loss on abandonment of property, plant and equipment. + References No definition available. + Details
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- Definition Adjustment for loss on disposal of investments in associates and joint ventures. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Adjustment for loss on disposal of investments in subsidiaries. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
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- Definition Adjustment for losses on disposal of intangible assets. + References No definition available. + Details
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Namespace Prefix: | kep_
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- Definition Adjustment for losses on disposals of property plant and equipment. + References No definition available. + Details
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- Definition Adjustment for losses on sale of financial assets. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
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- Definition Adjustment for other inflows outflows of cash. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
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- Definition Adjustment for share in loss profit of associates and joint ventures net. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Adjustments for decrease increase in non trade account receivable. + References No definition available. + Details
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- Definition Adjustments for employee benefit expense. + References No definition available. + Details
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- Definition Adjustments for gain on financial assets held for trading. + References No definition available. + Details
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- Definition Adjustments for increase decrease in accrued expenses. + References No definition available. + Details
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- Definition Adjustments for increase decrease in non trade payables. + References No definition available. + Details
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- Definition Adjustments for increase decrease in other noncurrent assets. + References No definition available. + Details
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- Definition Adjustments for increase decrease in other noncurrent liabilities. + References No definition available. + Details
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- Definition Adjustments for increase decrease in working capital. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Adjustments for loss on financial assets held for trading. + References No definition available. + Details
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Namespace Prefix: | kep_
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- Definition Collection of loans. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Decrease in deposits. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Dividends paid (hybrid bond) classified as financing activities. + References No definition available. + Details
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- Definition Foreign currency translation loss gain before tax. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Increase in deposits. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase in loans. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net cash inflow (outflow) from changes in consolidation scope. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Payments of derivative instruments. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Payments to plan asset. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds from payments to noncontrolling interest. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
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