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Consolidated Statements Of Cash Flows - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from (used in) operating activities      
Profit (loss) for the period ₩ (1,174,498) ₩ 1,441,394 ₩ 7,148,327
Adjustments for:      
Income Tax expense (benefit) (826,321) 2,172,824 3,365,141
Depreciation 9,905,856 9,660,039 8,881,273
Amortisation 118,938 113,672 79,715
Employee benefits expense 360,575 391,360 373,753
Bad debt expense 57,468 126,326 37,815
Interest expense 1,868,458 1,789,552 1,752,868
Losses on sale of financial assets 1 2,343 9
Losses on disposals of property, plant and equipment 60,704 70,514 4,996
Loss on abandonment of property, plant, and equipment 481,176 424,091 426,519
Impairment loss on property, plant and equipment 710,162 51,067 0
Impairment loss on intangible assets 8,112 [1] 20 3,945
Losses on disposal of intangible assets 43 183 158
Increase to provisions 1,056,994 1,690,120 1,782,732
Loss (gain) on foreign currency translation, net 243,378 (902,878) 253,468
Gain on valuation of financial assets at fair value through profit or loss (8,495) 0 0
Loss on valuation of financial assets at fair value through profit or loss 6,616 0 0
Valuation and transaction loss (gain) on derivative instruments, net (300,500) 1,043,628 (231,630)
Share in loss (income) of associates and joint ventures, net (363,101) 81,688 18,926
Gains on disposal of financial assets (1,838) (1,130) (1,482)
Gains on disposal of property plant, and equipment (98,077) (48,316) (74,035)
Gains on disposal of intangible assets (12) (564) 0
Gain on disposal of investments in associates and joint ventures (5,079) (609) (52)
Loss on disposal of investments in associates and joint ventures 2,183 0 2,935
Impairment loss on investments in associates and joint ventures 7,907 27,238 115,539
Gain on disposal of investments in subsidiaries (72) 0 0
Interest income (223,767) (206,143) (241,778)
Dividends income (12,777) (11,477) (9,446)
Impairment loss on available-for-sale financial assets 0 2,713 86,703
Other inflows (outflows) of cash 81,317 16,679 66,260
Adjustments for Cash flows from operating activities 13,129,849 16,492,940 16,694,332
Changes in:      
Trade receivables 246,755 (218,328) 200,529
Non-trade receivables 154,580 (31,807) (68,322)
Accrued income (484,718) 577,838 69,151
Other receivables (61,961) (1,271) 10,093
Other current assets (148,509) 37,576 (259,492)
Inventories (1,771,550) (1,373,438) (1,439,545)
Other non-current assets (54,148) (46,079) (2,792)
Trade payables 478,744 342,126 141,994
Non-trade payables (292,912) (214,704) (8,379)
Accrued expenses (361,204) (715,305) (153,172)
Other payables 0 292 0
Other current liabilities 250,112 (126,323) 284,417
Other non-current liabilities 287,488 763,958 809,699
Investments in associates and joint ventures (dividends received) 175,175 106,983 75,407
Provisions (1,132,969) (1,390,606) (1,527,129)
Payments of employee benefit obligations (89,253) (69,489) (53,477)
Plan assets (330,064) (325,080) (312,125)
Changes in assets and liabilities Cash flows from operating activities (3,134,434) (2,683,657) (2,233,143)
Cash generated from operating activities 8,820,917 15,250,677 21,609,516
Dividends received (available-for-sale financial assets) 11,182 10,590 10,294
Interest paid (1,895,898) (1,886,303) (2,041,379)
Interest received 194,221 173,226 240,878
Income taxes paid (450,290) (2,298,296) (3,298,757)
Net cash flows from operating activities 6,680,132 11,249,894 16,520,552
Cash flows from investing activities      
Proceeds from disposals of associates and joint ventures 1,617 10,542 46,644
Acquisition of associates and joint ventures (319,425) (206,753) (113,222)
Proceeds from sales of property, plant and equipment 234,138 85,801 207,960
Acquisition of property, plant and equipment (12,266,870) (12,535,958) (12,028,789)
Proceeds from sales of intangible assets 13 1,072 430
Acquisition of intangible assets (110,587) (143,887) (124,422)
Proceeds from disposals of financial assets 2,419,259 5,296,680 10,876,017
Acquisition of financial assets (2,841,651) (4,786,717) (8,130,621)
Increase in loans (188,675) (218,698) (206,092)
Collection of loans 100,010 120,967 117,561
Increase in deposits (299,564) (397,078) (468,734)
Decrease in deposits 259,930 110,383 161,166
Proceeds from disposals of assets held-for-sale 18,716 0 0
Receipt of government grants 30,416 55,533 32,878
Net cash inflow from changes in consolidation scope 2,141 0 3,754
Other cash inflow (outflow) from investing activities, net (53,769) 1,414 (20,400)
Net cash flows used in investing activities (13,014,301) (12,606,699) (9,645,870)
Cash flows from financing activities      
Proceeds from (Repayment of) short-term borrowings, Net (183,660) 370,328 (49,604)
Proceeds from long-term borrowings and debt securities 14,251,586 10,098,067 2,302,060
Repayment of long-term borrowings and debt securities (8,095,590) (8,198,882) (7,750,047)
Payment of finance lease liabilities (134,454) (122,919) (118,215)
Settlement of derivative instruments, net 60,907 33,434 73,246
Change in non-controlling interest 20,113 23,582 10,538
Repayment of hybrid bond 0 (99,750) 0
Dividends paid (hybrid bond) (17,658) (15,856) (16,455)
Dividends paid (599,391) (1,340,387) (2,088,429)
Other cash outflow from financing activities, net (175) (2,023) (570)
Net cash flows from (used in) financing activities 5,301,678 745,594 (7,637,476)
Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes (1,032,491) (611,211) (762,794)
Effect of exchange rate fluctuations on cash held 21,097 (70,403) 31,082
Net increase (decrease) in cash and cash equivalents (1,011,394) (681,614) (731,712)
Cash and cash equivalents at January 1 2,369,739 3,051,353 3,783,065
Cash and cash equivalents at December 31 ₩ 1,358,345 ₩ 2,369,739 ₩ 3,051,353
[1] KRW8,104 million of impairment loss on the intangible assets under development in relation to the technology development of heat transfer tube owned by KEPCO Nuclear Fuel Co., Ltd., 96.36% owned subsidiary, is included.