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Investments in Associates (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Daegu Green Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities   Power generation
Location   KOREA
Percentage of ownership   29.00%
Book value [Abstract]    
Beginning balance   ₩ 80,267
Acquisition   3,347
Disposal   (34,422)
Share of income (loss)   (1,814)
Other comprehensive income (loss)   148
Others (book value)   ₩ (47,526)
Korea Gas Corporation [Member]    
Disclosure of associates [Line Items]    
Key operation activities [1] Importing and wholesaling LNG Importing and wholesaling LNG
Location [1] KOREA KOREA
Percentage of ownership [1] 20.47% 20.47%
Acquisition cost [1] ₩ 94,500 ₩ 94,500
Book value [Abstract]    
Beginning balance 1,933,877 [1] 2,102,813
Dividends received   (3,213)
Share of income (loss) (242,232) (146,308)
Other comprehensive income (loss) (72,648) (14,551)
Others (book value) (129) (4,864)
Ending balance [1] 1,618,868 1,933,877
The fair value of associates 804,195 915,705
Share in net assets 1,755,887 2,024,665
Total assets 37,139,439 39,927,836
Total liabilities 28,999,025 30,541,350
Net assets 8,140,414 9,386,486
Others (consolidated FS) (137,019) (90,788)
Sales of Associates 22,172,305 21,108,116
Profit (loss) for the period of Associates ₩ (1,205,110) ₩ (673,558)
Korea Electric Power Industrial Development Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Electricity metering and others Electricity metering and others
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 4,727 ₩ 4,727
Book value [Abstract]    
Beginning balance 20,475 18,994
Dividends received (2,061) (1,598)
Share of income (loss) 3,428 4,491
Other comprehensive income (loss) 102  
Others (book value) (106) (1,412)
Ending balance 21,838 20,475
The fair value of associates 38,667 45,474
Share in net assets 21,838 20,475
Total assets 155,033 144,346
Total liabilities 79,730 73,742
Net assets 75,303 70,604
Sales of Associates 334,547 304,067
Profit (loss) for the period of Associates ₩ 16,126 ₩ 17,187
YTN Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Broadcasting Broadcasting
Location KOREA KOREA
Percentage of ownership 21.43% 21.43%
Acquisition cost ₩ 59,000 ₩ 59,000
Book value [Abstract]    
Beginning balance 38,156 38,365
Dividends received (135)  
Share of income (loss) 1,095 (227)
Other comprehensive income (loss) 929 32
Others (book value) 561 (14)
Ending balance 40,606 38,156
The fair value of associates 18,855 22,320
Share in net assets 40,624 38,191
Total assets 298,122 304,536
Total liabilities 108,554 126,324
Net assets 189,568 178,212
Intercompany transaction (18) (30)
Others (consolidated FS)   (5)
Sales of Associates 131,080 130,690
Profit (loss) for the period of Associates ₩ 3,638 ₩ 2,051
Cheongna Energy Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Generating and distributing vapor and hot/cold water Generating and distributing vapor and hot/cold water
Location KOREA KOREA
Percentage of ownership 43.90% 43.90%
Acquisition cost ₩ 48,353 ₩ 48,353
Book value [Abstract]    
Beginning balance 12,373 19,490
Share of income (loss) (4,036) (7,117)
Ending balance 8,337 12,373
Share in net assets 5,893 9,933
Total assets 461,958 469,843
Total liabilities 448,535 447,216
Net assets 13,423 22,627
Investment differential 2,584 2,584
Intercompany transaction (140) (144)
Sales of Associates 56,533 46,484
Profit (loss) for the period of Associates ₩ (9,203) ₩ (16,127)
Gangwon Wind Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities [2] Power generation Power generation
Location [2] KOREA KOREA
Percentage of ownership [2] 15.00% 15.00%
Acquisition cost [2] ₩ 5,725 ₩ 5,725
Book value [Abstract]    
Beginning balance 13,069 [2] 12,890
Dividends received (852) (1,136)
Share of income (loss) 1,638 1,270
Other comprehensive income (loss)   45
Ending balance [2] 13,855 13,069
Share in net assets 13,806 13,020
Total assets 94,281 102,550
Total liabilities 2,243 15,753
Net assets 92,038 86,797
Others (consolidated FS) 49 49
Sales of Associates 25,963 22,774
Profit (loss) for the period of Associates ₩ 11,121 ₩ 8,133
Hyundai Green Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 88,885 ₩ 88,885
Book value [Abstract]    
Beginning balance 115,998 113,664
Dividends received (8,889) (8,888)
Share of income (loss) 7,697 11,222
Ending balance 114,806 115,998
Share in net assets 114,806 115,998
Total assets 1,150,729 1,151,975
Total liabilities 754,846 751,981
Net assets 395,883 399,994
Sales of Associates 477,373 469,547
Profit (loss) for the period of Associates ₩ 26,543 ₩ 38,743
Shareholders’ agreements that may cause future economic resource or cash outflows As of December 31, 2017, Hyundai Green Power Co., Ltd., an associate of the Company, which engages in the byproduct gas power generating business, entered into a project financing agreement with a limit of ￦919.2 billion with Korea Development Bank and others. At a certain period in the future, the Company has an appraisal right against the financial investors (Korea Development Bank and others) and also has an obligation to sell its shares when claimed by the financial investors. At a certain period in the future, the Company has an appraisal right against Hyundai Steel Company and a third party designated by Hyundai Steel Company (collectively, “Hyundai Steel Company”), the operating investor of Hyundai Green Power Co., Ltd., according to the conditions of the agreement and also has an obligation to sell its shares when claimed by Hyundai Steel Company.  
Korea Power Exchange [Member]    
Disclosure of associates [Line Items]    
Key operation activities Management of power market and others [3] Management of power market and others [4]
Location KOREA [3] KOREA [4]
Percentage of ownership 100.00% [3] 100.00% [4]
Acquisition cost ₩ 127,839 [3] ₩ 127,839 [4]
Book value [Abstract]    
Beginning balance 223,238 [4] 208,735
Share of income (loss) 8,831 15,847
Others (book value) 5,562 (1,344)
Ending balance 237,631 [3] 223,238 [4]
Share in net assets 237,631 223,238
Total assets 263,499 255,533
Total liabilities 25,868 32,295
Net assets 237,631 223,238
Sales of Associates 105,107 101,222
Profit (loss) for the period of Associates ₩ 8,831 ₩ 15,087
AMEC Partners Korea Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities [5] Resources development Resources development
Location [5] KOREA KOREA
Percentage of ownership [5] 19.00% 19.00%
Acquisition cost [5] ₩ 707 ₩ 707
Book value [Abstract]    
Beginning balance 225 [5] 230
Share of income (loss) (10) (5)
Ending balance [5] 215 225
Share in net assets 215 225
Total assets 1,135 1,216
Total liabilities 4 32
Net assets 1,131 1,184
Sales of Associates 1 103
Profit (loss) for the period of Associates ₩ (53) ₩ (25)
Hyundai Energy [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation [6] Power generation [7]
Location KOREA [6] KOREA [7]
Percentage of ownership 30.66% [6] 30.66% [7]
Acquisition cost ₩ 71,070 [6] ₩ 71,070 [7]
Book value [Abstract]    
Beginning balance 1,031 [7] 6,990
Share of income (loss) (3,498) (21,163)
Others (book value) 2,467 15,204
Ending balance [7]   1,031
Share in net assets (16,921) 3,136
Total assets 474,939 505,979
Total liabilities 511,486 499,205
Net assets (36,547) 6,774
Intercompany transaction (1,037) (1,079)
Others (consolidated FS) 17,958 (1,026)
Sales of Associates 92,992 61,813
Profit (loss) for the period of Associates ₩ (43,317) ₩ (45,800)
Shareholders’ agreements that may cause future economic resource or cash outflows The Company had placed guarantees for a fixed return on the investment to NH Power II Co., Ltd. and National Agricultural Cooperative Federation (“NACF”) and had obtained the rights to acquire the investment securities in return preferentially. In addition, NH Power II Co., Ltd. and NACF have a right, which can be exercised for 30 days starting from 2 months to 1 month prior to 17 years after the termination date of the contract to sell their shares to the Company.  
Ecollite Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Artificial light-weight aggregate Artificial light-weight aggregate
Location KOREA KOREA
Percentage of ownership 36.10% 36.10%
Acquisition cost ₩ 1,516 ₩ 1,516
Book value [Abstract]    
Share in net assets 614 657
Total assets 2,052 2,157
Total liabilities 352 336
Net assets 1,700 1,821
Others (consolidated FS) (614) (657)
Profit (loss) for the period of Associates ₩ (121) ₩ (105)
Taebaek Wind Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 25.00% 25.00%
Acquisition cost ₩ 3,810 ₩ 3,810
Book value [Abstract]    
Beginning balance 4,750 4,956
Share of income (loss) 569 (206)
Ending balance 5,319 4,750
Share in net assets 5,319 4,750
Total assets 39,227 43,162
Total liabilities 17,953 24,162
Net assets 21,274 19,000
Sales of Associates 7,056 5,741
Profit (loss) for the period of Associates ₩ 2,312 ₩ (2,796)
Shareholders’ agreements that may cause future economic resource or cash outflows In case non-controlling shareholders decide to dispose of their shares in Taebaek Wind Power Co., Ltd. after the warrant period of defect repair for wind power generator has expired, the Company acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with consideration of various factors such as financial status and business situation.  
Significant restrictions on its abilities Financial institutions can reject or defer an approval with regard to the request for fund executions on subordinated loans of shareholders in order to pay senior loans based on the loan agreement.  
Taeback Guinemi Wind Power Co., Ltd. (formerly, Muju Wind Power Co., Ltd.) [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 25.00% 25.00%
Acquisition cost ₩ 3,420 ₩ 3,420
Book value [Abstract]    
Beginning balance 3,131 2,587
Acquisition   570
Share of income (loss) (42) (26)
Ending balance 3,089 3,131
Share in net assets 3,089 3,131
Total assets 12,369 12,523
Total liabilities 12 1
Net assets 12,357 12,522
Profit (loss) for the period of Associates ₩ (140) ₩ (106)
Pyeongchang Wind Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 25.00% 25.00%
Acquisition cost ₩ 3,875 ₩ 3,875
Book value [Abstract]    
Beginning balance 3,383 3,402
Share of income (loss) 753 (19)
Ending balance 4,136 3,383
Share in net assets 4,136 3,383
Total assets 77,152 75,440
Total liabilities 60,606 61,909
Net assets 16,546 13,531
Sales of Associates 11,907 3,997
Profit (loss) for the period of Associates ₩ 3,038 ₩ (45)
Shareholders’ agreements that may cause future economic resource or cash outflows In case non-controlling shareholders decide to dispose of their shares in Pyeongchang Wind Power Co., Ltd. after commercial operation of the power plant has started, the Company acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with the careful consideration of various factors such as financial status and business situation.  
Significant restrictions on its abilities Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.  
Daeryun Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities [5],[8] Power generation Power generation
Location [5],[8] KOREA KOREA
Percentage of ownership [5],[8] 13.13% 13.13%
Acquisition cost [5],[8] ₩ 25,477 ₩ 25,477
Book value [Abstract]    
Beginning balance 29,873 [5],[8] 36,156
Share of income (loss) (4,762) (6,282)
Other comprehensive income (loss)   (1)
Others (book value) 2  
Ending balance [5],[8] 25,113 29,873
Share in net assets 24,095 28,855
Total assets 779,258 793,283
Total liabilities 655,377 644,930
Net assets 123,881 148,353
Investment differential 1,014 1,014
Others (consolidated FS) 4 4
Sales of Associates 156,508 249,558
Profit (loss) for the period of Associates ₩ (23,978) (32,291)
Significant restrictions on its abilities Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.  
JinanJangsu Wind Power Co., Ltd. [Member]    
Book value [Abstract]    
Beginning balance   77
Disposal   64
Share of income (loss)   ₩ (13)
Changjuk Wind Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 30.00% 30.00%
Acquisition cost ₩ 3,801 ₩ 3,801
Book value [Abstract]    
Beginning balance 6,930 6,143
Dividends received (111) (190)
Share of income (loss) 696 977
Ending balance 7,515 6,930
Share in net assets 7,515 6,815
Total assets 35,794 37,878
Total liabilities 10,745 15,162
Net assets 25,049 22,716
Others (consolidated FS)   115
Sales of Associates 6,981 5,782
Profit (loss) for the period of Associates ₩ 2,317 ₩ 1,739
Significant restrictions on its abilities Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.  
KNH Solar Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 27.00% 27.00%
Acquisition cost ₩ 1,296 ₩ 1,296
Book value [Abstract]    
Beginning balance 2,073 1,924
Share of income (loss) 145 144
Other comprehensive income (loss)   5
Ending balance 2,218 2,073
Share in net assets 2,218 2,073
Total assets 24,432 25,878
Total liabilities 16,215 18,199
Net assets 8,217 7,679
Sales of Associates 3,947 4,006
Profit (loss) for the period of Associates ₩ 628 ₩ 638
Significant restrictions on its abilities Principal and interest, dividends to shareholders cannot be paid without written consent of financial institutions.  
SPC Power Corporation [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location PHILIPPINES PHILIPPINES
Percentage of ownership 38.00% 38.00%
Acquisition cost ₩ 20,635 ₩ 20,635
Book value [Abstract]    
Beginning balance 56,818 58,033
Dividends received (5,562) (7,151)
Share of income (loss) 4,310 6,416
Other comprehensive income (loss) (3,276) (477)
Others (book value) (7) (3)
Ending balance 52,283 56,818
The fair value of associates 72,616 70,253
Share in net assets 52,283 56,818
Total assets 137,586 191,562
Total liabilities   42,042
Net assets 137,586 149,520
Sales of Associates 68,149 73,674
Profit (loss) for the period of Associates ₩ 37,395 ₩ 42,617
Gemeng International Energy Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location CHINA CHINA
Percentage of ownership 34.00% 34.00%
Acquisition cost ₩ 413,153 ₩ 413,153
Book value [Abstract]    
Beginning balance 680,065 728,396
Dividends received (13,365) (16,476)
Share of income (loss) 6,953 26,714
Other comprehensive income (loss) (23,680) (58,493)
Others (book value)   (76)
Ending balance 649,973 680,065
Share in net assets 649,973 680,331
Total assets 6,496,294 5,822,879
Total liabilities 4,584,608 3,821,905
Net assets 1,911,686 2,000,974
Others (consolidated FS)   (266)
Sales of Associates 1,334,833 1,233,972
Profit (loss) for the period of Associates ₩ 21,769 ₩ 66,370
Shareholders’ agreements that may cause future economic resource or cash outflows Gemeng International Energy Co., Ltd., issued put options on 8% of its shares to its financial investors, KEPCO Woori Sprott PEF (NPS Co-Pa PEF). If the investment fund is not collected until the maturity date (December 25, 2023, two years extension is possible), PEF can exercise the option at strike price which is the same as a principal investment price (including operating fees ratio of below 1% per annum), and also, the Company provided a performance guarantee on this agreement.  
PT. Cirebon Electric Power [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location INDONESIA INDONESIA
Percentage of ownership 27.50% 27.50%
Acquisition cost ₩ 40,365 ₩ 40,365
Book value [Abstract]    
Beginning balance 96,658 60,574
Dividends received (550) (1,242)
Share of income (loss) 10,685 31,511
Other comprehensive income (loss) 2,232 2,568
Others (book value) (11,615) 3,247
Ending balance 97,410 96,658
Share in net assets 97,410 96,658
Total assets 903,429 988,975
Total liabilities 549,212 637,491
Net assets 354,217 351,484
Sales of Associates 280,452 265,813
Profit (loss) for the period of Associates ₩ 38,448 ₩ 114,653
KNOC Nigerian East Oil [Member]    
Disclosure of associates [Line Items]    
Key operation activities [9] Resources development Resources development
Location [9] NIGERIA NIGERIA
Percentage of ownership [9] 14.63% 14.63%
Acquisition cost [9] ₩ 12 ₩ 12
Book value [Abstract]    
Share of income (loss) (1,914) (1,346)
Other comprehensive income (loss) 1,536 (398)
Others (book value) 378 1,744
Share in net assets (12,850) (12,472)
Total assets 241,808 272,964
Total liabilities 329,639 358,211
Net assets (87,831) (85,247)
Others (consolidated FS) 12,850 12,472
Profit (loss) for the period of Associates ₩ (10,754) ₩ (7,051)
KNOC Nigerian West Oil [Member]    
Disclosure of associates [Line Items]    
Key operation activities [9] Resources development Resources development
Location [9] NIGERIA NIGERIA
Percentage of ownership [9] 14.63% 14.63%
Acquisition cost [9] ₩ 12 ₩ 12
Book value [Abstract]    
Share of income (loss) (1,712) (973)
Other comprehensive income (loss) 1,407 (356)
Others (book value) 305 1,329
Share in net assets (11,763) (11,458)
Total assets 147,185 165,396
Total liabilities 227,588 243,713
Net assets (80,403) (78,317)
Others (consolidated FS) 11,763 11,458
Profit (loss) for the period of Associates ₩ (9,768) (6,562)
Dolphin Property Limited [Member]    
Book value [Abstract]    
Beginning balance   61
Dividends received   (35)
Other comprehensive income (loss)   (69)
Others (book value)   ₩ 43
PT Wampu Electric Power [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location INDONESIA INDONESIA
Percentage of ownership 46.00% 46.00%
Acquisition cost ₩ 21,292 ₩ 21,292
Book value [Abstract]    
Beginning balance 23,188 18,963
Share of income (loss) 9,336 3,493
Other comprehensive income (loss)   (3)
Others (book value) (3,121) 735
Ending balance 29,403 23,188
Share in net assets 29,403 23,188
Total assets 212,095 222,004
Total liabilities 148,177 171,595
Net assets 63,918 50,409
Sales of Associates 779 19,260
Profit (loss) for the period of Associates ₩ 8,114 ₩ 7,550
PT. Bayan Resources TBK [Member]    
Disclosure of associates [Line Items]    
Key operation activities Resources development Resources development
Location INDONESIA INDONESIA
Percentage of ownership 20.00% 20.00%
Acquisition cost ₩ 615,860 ₩ 615,860
Book value [Abstract]    
Beginning balance 402,667 525,066
Share of income (loss) 34,122 (23,257)
Other comprehensive income (loss) 14,982 208
Others (book value) 60 (99,350)
Ending balance 451,831 402,667
The fair value of associates 558,267 359,200
Share in net assets 70,245 19,895
Total assets 908,106 945,436
Total liabilities 556,881 845,963
Net assets 351,225 99,473
Investment differential 482,109 482,109
Others (consolidated FS) (100,523) (99,337)
Sales of Associates 811,515 593,441
Profit (loss) for the period of Associates ₩ 243,621 ₩ 402
S-Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 49.00% 49.00%
Acquisition cost ₩ 132,300 ₩ 132,300
Book value [Abstract]    
Beginning balance 123,912 130,908
Share of income (loss) (6,982) (7,006)
Others (book value) 15 10
Ending balance 116,945 123,912
Share in net assets 118,780 125,856
Total assets 859,633 886,841
Total liabilities 617,224 629,992
Net assets 242,409 256,849
Intercompany transaction (1,835) (1,944)
Sales of Associates 489,042 453,606
Profit (loss) for the period of Associates ₩ (14,470) ₩ (14,885)
Pioneer Gas Power Limited [Member]    
Disclosure of associates [Line Items]    
Key operation activities [10] Power generation Power generation
Location [10] INDIA INDIA
Percentage of ownership [10] 38.50% 40.00%
Acquisition cost [10] ₩ 49,831 ₩ 49,831
Book value [Abstract]    
Beginning balance 50,740 [10] 51,187
Share of income (loss) (11,119) (698)
Other comprehensive income (loss) (1,238) 251
Others (book value) 276  
Ending balance [10] 38,659 50,740
Share in net assets 16,314 27,525
Total assets 339,271 345,791
Total liabilities 296,898 276,978
Net assets 42,373 68,813
Investment differential 22,278 23,147
Others (consolidated FS) 67 68
Sales of Associates 8,215 14,353
Profit (loss) for the period of Associates ₩ (27,796) ₩ 396
Eurasia Energy Holdings [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation and resources development Power generation and resources development
Location RUSSIA RUSSIA
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 461 ₩ 461
Book value [Abstract]    
Share in net assets (172) (194)
Total assets 548 618
Total liabilities 978 1,103
Net assets (430) (485)
Others (consolidated FS) 172 194
Unrecognized equity interest (22) 6
Accumulated unrecognized equity interest ₩ 172 ₩ 194
Xe-Pian Xe-Namnoy Power [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location LAOS LAOS
Percentage of ownership 25.00% 25.00%
Acquisition cost ₩ 71,481 ₩ 49,119
Book value [Abstract]    
Beginning balance 51,544 31,863
Acquisition 22,362 16,402
Share of income (loss) (4,264) 1,576
Other comprehensive income (loss) (7,863) 1,703
Ending balance 61,779 51,544
Share in net assets 62,832 57,307
Total assets 858,789 772,699
Total liabilities 607,462 543,472
Net assets 251,327 229,227
Investment differential 74 (4,802)
Intercompany transaction (838) (672)
Others (consolidated FS) (289) (289)
Profit (loss) for the period of Associates ₩ (16,677) 6,458
Busan Solar [Member]    
Book value [Abstract]    
Beginning balance   925
Disposal   887
Share of income (loss)   ₩ (38)
Hadong Mineral Fiber Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Recycling fly ashes [5] Recycling fly ashes [11]
Location KOREA [5] KOREA [11]
Percentage of ownership 8.33% [5] 8.33% [11]
Acquisition cost ₩ 50 [5] ₩ 50 [11]
Book value [Abstract]    
Share of income (loss) (31)  
Others (book value) 31  
Share in net assets (2) (5)
Total assets 203  
Total liabilities 231 20
Net assets (28) (20)
Others (consolidated FS) 2 5
Profit (loss) for the period of Associates (260)  
Unrecognized equity interest (3)  
Accumulated unrecognized equity interest ₩ 2 ₩ 5
Green Biomass Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities [12] Power generation [13] Power generation
Location [12] KOREA [13] KOREA
Percentage of ownership [12] 8.80% [13] 14.00%
Acquisition cost [12] ₩ 714 [13] ₩ 714
Book value [Abstract]    
Beginning balance [12] 47  
Share of income (loss) (112) (138)
Others (book value) 273 185
Ending balance [12] 208 [13] 47
Share in net assets 208 47
Total assets 6,379 9,336
Total liabilities 4,018 9,001
Net assets 2,361 335
Sales of Associates 2,337 2,892
Profit (loss) for the period of Associates ₩ (956) ₩ (972)
PT. Mutiara Jawa [Member]    
Disclosure of associates [Line Items]    
Key operation activities Manufacturing and operating floating coal terminal Manufacturing and operating floating coal terminal
Location INDONESIA INDONESIA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 2,978 ₩ 2,978
Book value [Abstract]    
Share in net assets (746) (1,904)
Total assets 27,098 28,104
Total liabilities 29,670 34,671
Net assets (2,572) (6,567)
Investment differential   70
Others (consolidated FS) 746 1,834
Sales of Associates 13,574 7,175
Profit (loss) for the period of Associates 3,455 (1,361)
Unrecognized equity interest (1,159) 554
Accumulated unrecognized equity interest ₩ 746 ₩ 1,905
Samcheok Eco Materials Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities [14] Recycling fly ashes Recycling fly ashes [5]
Location [14] KOREA KOREA [5]
Percentage of ownership [14] 2.35% 2.35% [5]
Acquisition cost [14] ₩ 686 ₩ 686 [5]
Book value [Abstract]    
Share in net assets 551 561
Total assets 23,729 24,143
Total liabilities 270 254
Net assets 23,459 23,889
Others (consolidated FS) (551) (561)
Sales of Associates 15  
Profit (loss) for the period of Associates ₩ (541) ₩ (1,945)
Shareholders’ agreements that may cause future economic resource or cash outflows The Company has the rights to purchase the stocks should preferred stockholders elect to sell their stocks on the expected sell date (3 years from preferred stock payment date) and is required to guarantee the promised yield when preferred stockholders sell their stocks.  
Noeul Green Energy Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 1,740 ₩ 1,740
Book value [Abstract]    
Beginning balance 1,217 295
Acquisition   1,340
Share of income (loss) 850 (418)
Ending balance 2,067 1,217
Share in net assets 2,067 1,217
Total assets 127,980 115,062
Total liabilities 120,852 110,866
Net assets 7,128 4,196
Sales of Associates 43,099 203
Profit (loss) for the period of Associates ₩ 2,932 ₩ (1,155)
Naepo Green Energy Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 41.67% 25.00%
Acquisition cost ₩ 29,200 ₩ 29,200
Book value [Abstract]    
Beginning balance 25,438 26,746
Share of income (loss) (1,400) (1,308)
Others (book value) (3,440)  
Ending balance 20,598 25,438
Share in net assets 20,598 25,438
Total assets 121,375 104,029
Total liabilities 71,945 2,276
Net assets 49,430 101,753
Sales of Associates 5,696 4,912
Profit (loss) for the period of Associates ₩ (5,603) ₩ (5,230)
Goseong Green Energy Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities [2] Power generation Power generation
Location [2] KOREA KOREA
Percentage of ownership [2] 1.12% 1.12%
Acquisition cost [2] ₩ 2,900 ₩ 2,900
Book value [Abstract]    
Beginning balance 2,663 [2] 2,670
Share of income (loss) (66) 71
Others (book value)   (78)
Ending balance [2] 2,597 2,663
Share in net assets 2,676 2,742
Total assets 1,081,238 356,546
Total liabilities 841,330 110,753
Net assets 239,908 245,793
Intercompany transaction (79) (79)
Profit (loss) for the period of Associates ₩ (5,811) ₩ (5,489)
Gangneung Eco Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities [2] Power generation Power generation
Location [2] KOREA KOREA
Percentage of ownership [2] 1.61% 1.61%
Acquisition cost [2] ₩ 2,900 ₩ 2,900
Book value [Abstract]    
Beginning balance 2,646 [2] 2,688
Share of income (loss) (63) 56
Others (book value)   (98)
Ending balance [2] 2,583 2,646
Share in net assets 2,681 2,744
Total assets 186,765 176,805
Total liabilities 20,344 6,503
Net assets 166,421 170,302
Intercompany transaction (98) (98)
Profit (loss) for the period of Associates ₩ (3,407) ₩ (3,494)
Shin Pyeongtaek Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 43,920 ₩ 40
Book value [Abstract]    
Acquisition 43,880  
Share of income (loss) (10,998)  
Other comprehensive income (loss) (3,617)  
Others (book value) 5,638  
Ending balance 34,903  
Share in net assets 34,083 (2,538)
Total assets 175,870 54,174
Total liabilities 90,662 60,518
Net assets 85,208 (6,344)
Investment differential 7,808  
Intercompany transaction (6,988) (3,380)
Others (consolidated FS)   5,918
Profit (loss) for the period of Associates (4,585) (3,291)
Unrecognized equity interest ₩ (2,537) 1,211
Accumulated unrecognized equity interest   ₩ 2,537
Heang Bok Do Si Photovoltaic Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 28.00% 28.00%
Acquisition cost ₩ 194 ₩ 194
Book value [Abstract]    
Beginning balance 181 189
Share of income (loss) 6 (10)
Others (book value)   2
Ending balance 187 181
Share in net assets 185 179
Total assets 2,782 2,937
Total liabilities 2,120 2,297
Net assets 662 640
Others (consolidated FS) 2 2
Sales of Associates 451 427
Profit (loss) for the period of Associates ₩ 22 ₩ (47)
DS POWER Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation [2]
Location KOREA KOREA [2]
Percentage of ownership [2]   14.44%
Acquisition cost [2]   ₩ 17,900
Book value [Abstract]    
Beginning balance ₩ 7,190 [2] 10,960
Share of income (loss) (1,321) (3,738)
Others (book value) ₩ (5,869) (32)
Ending balance [2]   7,190
Share in net assets   15,582
Total assets   726,699
Total liabilities   618,793
Net assets   107,906
Intercompany transaction   (7,302)
Others (consolidated FS)   (1,090)
Sales of Associates   276,324
Profit (loss) for the period of Associates   ₩ (10,031)
Dongducheon Dream Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 33.61% 33.61%
Acquisition cost ₩ 111,134 ₩ 61,535
Book value [Abstract]    
Beginning balance 46,876 55,667
Share of income (loss) (10,980) (8,757)
Others (book value) 17,337 (34)
Ending balance 53,233 46,876
Share in net assets 70,356 81,730
Total assets 1,575,175 1,670,945
Total liabilities 1,365,845 1,427,773
Net assets 209,330 243,172
Intercompany transaction (4,409) (4,768)
Others (consolidated FS) (12,714) (30,086)
Sales of Associates 813,440 946,379
Profit (loss) for the period of Associates ₩ (33,740) ₩ (27,936)
KS Solar Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation [5]
Location KOREA KOREA [5]
Percentage of ownership [5]   19.00%
Acquisition cost [5]   ₩ 637
Book value [Abstract]    
Beginning balance ₩ 604 [5] 618
Disposal (613)  
Share of income (loss)   (14)
Other comprehensive income (loss) ₩ 9  
Ending balance [5]   604
Share in net assets   604
Total assets   27,213
Total liabilities   24,035
Net assets   3,178
Sales of Associates   4,152
Profit (loss) for the period of Associates   ₩ (79)
Yeongwol Energy Station Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities [2]   Power generation
Location [2]   KOREA
Percentage of ownership [2]   10.00%
Acquisition cost [2]   ₩ 1,400
Book value [Abstract]    
Beginning balance   1,290
Share of income (loss)   85
Other comprehensive income (loss)   25
Others (book value)   ₩ (1,400)
Jinbhuvish Power Generation Pvt. Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities [2] Power generation Power generation
Location [2] INDIA INDIA
Percentage of ownership [2] 5.16% 5.16%
Acquisition cost [2] ₩ 9,000 ₩ 9,000
Book value [Abstract]    
Beginning balance   8,350
Share of income (loss)   (49)
Other comprehensive income (loss)   (198)
Others (book value)   (8,103)
Share in net assets 2,704 2,877
Total assets 66,047 70,273
Total liabilities 13,640 14,513
Net assets 52,407 55,760
Others (consolidated FS) ₩ (2,704) (2,877)
Profit (loss) for the period of Associates   ₩ (950)
SE Green Energy Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation support Power generation support
Location KOREA KOREA
Percentage of ownership 47.76% 47.76%
Acquisition cost ₩ 3,821 ₩ 3,821
Book value [Abstract]    
Beginning balance 3,525 3,575
Share of income (loss) (49) (50)
Ending balance 3,476 3,525
Share in net assets 3,476 3,525
Total assets 7,278 7,381
Net assets 7,278 7,381
Profit (loss) for the period of Associates ₩ (103) ₩ (103)
Daegu Photovoltaic Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 1,230 ₩ 1,230
Book value [Abstract]    
Beginning balance 1,700 1,886
Dividends received (349) (411)
Share of income (loss) 367 225
Ending balance 1,718 1,700
Share in net assets 1,718 1,700
Total assets 17,262 18,909
Total liabilities 11,339 13,047
Net assets 5,923 5,862
Sales of Associates 3,714 3,317
Profit (loss) for the period of Associates ₩ 1,263 ₩ 739
Jeongam Wind Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 5,580 ₩ 5,580
Book value [Abstract]    
Beginning balance 4,000 702
Acquisition   3,900
Share of income (loss) (237) (602)
Ending balance 3,763 4,000
Share in net assets 3,763 4,000
Total assets 67,427 13,199
Total liabilities 58,019 3,199
Net assets 9,408 10,000
Profit (loss) for the period of Associates ₩ (580) ₩ (1,496)
Shareholders’ agreements that may cause future economic resource or cash outflows In case non-controlling shareholders decide to dispose of their shares in Jeongam Wind Power Co., Ltd. after the construction of the power plant has been completed, the Company is obligated to acquire those shares at fair value.  
Korea Power Engineering Service Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Construction and service Construction and service
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 290 ₩ 290
Book value [Abstract]    
Beginning balance 2,810 1,805
Dividends received (191)  
Share of income (loss) 1,030 1,005
Others (book value) 10  
Ending balance 3,659 2,810
Share in net assets 3,659 2,810
Total assets 15,738 13,401
Total liabilities 3,121 3,713
Net assets 12,617 9,688
Sales of Associates 22,283 27,394
Profit (loss) for the period of Associates ₩ 3,783 ₩ 3,463
Busan Green Energy Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 5,243 ₩ 14,564
Book value [Abstract]    
Beginning balance 13,803 14,512
Disposal (9,320)  
Share of income (loss) 2,884 (709)
Others (book value) (4)  
Ending balance 7,363 13,803
Share in net assets 7,363 13,803
Total assets 193,253 147,843
Total liabilities 167,864 100,247
Net assets 25,389 47,596
Sales of Associates 34,280  
Profit (loss) for the period of Associates ₩ 9,946 ₩ (2,444)
Gunsan Bio Energy Co., Ltd. (formerly, Jungbu Bio Energy Co., Ltd.) [Member]    
Disclosure of associates [Line Items]    
Key operation activities [2] Power generation Power generation
Location [2] KOREA KOREA
Percentage of ownership [2] 18.87% 18.87%
Acquisition cost [2] ₩ 1,000 ₩ 1,000
Book value [Abstract]    
Beginning balance   904
Share of income (loss)   (904)
Share in net assets (1,286) (132)
Total assets 9,648 11,340
Total liabilities 16,462 12,037
Net assets (6,814) (697)
Others (consolidated FS) 1,286 132
Profit (loss) for the period of Associates (6,109) (5,489)
Unrecognized equity interest 1,154 132
Accumulated unrecognized equity interest ₩ 1,286 ₩ 132
Korea Electric Vehicle Charging Service [Member]    
Disclosure of associates [Line Items]    
Key operation activities Electric vehicle charge service Electric vehicle charge service
Location KOREA KOREA
Percentage of ownership 28.00% 28.00%
Acquisition cost ₩ 2,604 ₩ 1,596
Book value [Abstract]    
Beginning balance 1,103 1,446
Acquisition 1,008  
Share of income (loss) (362) (343)
Ending balance 1,749 1,103
Share in net assets 1,749 1,103
Total assets 14,650 10,545
Total liabilities 8,404 6,604
Net assets 6,246 3,941
Sales of Associates 8,399 5,177
Profit (loss) for the period of Associates ₩ (1,295) ₩ (1,225)
Ulleungdo Natural Energy Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Renewable power generation Renewable power generation
Location KOREA KOREA
Percentage of ownership 29.85% 29.85%
Acquisition cost ₩ 8,000 ₩ 8,000
Book value [Abstract]    
Beginning balance 6,894 7,417
Share of income (loss) (524) (516)
Others (book value)   (7)
Ending balance 6,370 6,894
Share in net assets 6,370 6,895
Total assets 25,842 24,836
Total liabilities 4,501 1,738
Net assets 21,341 23,098
Others (consolidated FS)   (1)
Profit (loss) for the period of Associates ₩ (1,758) ₩ (1,730)
Korea Nuclear Partners Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Electric material agency Electric material agency
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 290 ₩ 290
Book value [Abstract]    
Beginning balance 248 289
Share of income (loss) 135 (41)
Ending balance 383 248
Share in net assets 383 248
Total assets 2,033 1,363
Total liabilities 711 507
Net assets 1,322 856
Sales of Associates 1,345 372
Profit (loss) for the period of Associates ₩ 465 ₩ (140)
Tamra Offshore Wind Power Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 27.00% 27.00%
Acquisition cost ₩ 8,910 ₩ 8,910
Book value [Abstract]    
Beginning balance 7,015  
Acquisition   8,910
Share of income (loss) 1,545 (1,895)
Ending balance 8,560 7,015
Share in net assets 8,560 7,015
Total assets 163,740 127,880
Total liabilities 132,036 101,900
Net assets 31,704 25,980
Sales of Associates 4,392 983
Profit (loss) for the period of Associates ₩ (191) ₩ (6,307)
Korea Electric Power Corporation Fund [Member]    
Disclosure of associates [Line Items]    
Key operation activities [15] Developing electric enterprises Developing electric enterprises
Location [15] KOREA KOREA
Percentage of ownership [15] 98.09% 98.09%
Acquisition cost [15] ₩ 51,500 ₩ 51,500
Book value [Abstract]    
Beginning balance [15] 50,856  
Acquisition   51,500
Share of income (loss) (2,171) (644)
Other comprehensive income (loss) (711)  
Ending balance [15] 47,974 50,856
Share in net assets 47,971 50,852
Total assets 49,170 51,970
Total liabilities 265 128
Net assets 48,905 51,842
Others (consolidated FS) 3 4
Sales of Associates 666 3
Profit (loss) for the period of Associates ₩ (2,213) ₩ (647)
Energy Infra Asset Management Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities [5] Asset management Asset management
Location [5] KOREA KOREA
Percentage of ownership [5] 9.90% 9.90%
Acquisition cost [5] ₩ 297 ₩ 297
Book value [Abstract]    
Beginning balance [5] 259  
Acquisition   297
Share of income (loss) 217 (38)
Ending balance [5] 476 259
Share in net assets 476 259
Total assets 5,240 2,779
Total liabilities 431 160
Net assets 4,809 2,619
Sales of Associates 5,807 32
Profit (loss) for the period of Associates ₩ 2,203 ₩ (381)
Daegu clean Energy Co., Ltd. [Member]    
Disclosure of associates [Line Items]    
Key operation activities Renewable power generation Renewable power generation
Location KOREA KOREA
Percentage of ownership 28.00% 28.00%
Acquisition cost ₩ 140 ₩ 140
Book value [Abstract]    
Beginning balance 140  
Acquisition   140
Share of income (loss) (129)  
Ending balance 11 140
Share in net assets 11 140
Total assets 252 500
Total liabilities 212  
Net assets 40 ₩ 500
Profit (loss) for the period of Associates ₩ (460)  
YaksuESS Co., Ltd [Member]    
Disclosure of associates [Line Items]    
Key operation activities Installing ESS related equipment Installing ESS related equipment
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 210 ₩ 210
Book value [Abstract]    
Beginning balance 196  
Acquisition   210
Share of income (loss) (2) (14)
Ending balance 194 196
Share in net assets 193 195
Total assets 7,105 6,474
Total liabilities 6,437 5,801
Net assets 668 673
Others (consolidated FS) 1 1
Sales of Associates 381  
Profit (loss) for the period of Associates ₩ (6) ₩ (48)
Nepal Water & Energy Development Company Private Limited [Member]    
Disclosure of associates [Line Items]    
Key operation activities [16] Construction and operation of utility plant Construction and operation of utility plant
Location [16] NEPAL NEPAL
Percentage of ownership [16] 62.13% 52.77%
Acquisition cost [16] ₩ 33,577 ₩ 18,568
Book value [Abstract]    
Beginning balance [16] 18,667  
Acquisition 15,009  
Share of income (loss) (677)  
Other comprehensive income (loss) (2,501)  
Others (book value)   18,667
Ending balance [16] 30,498 18,667
Share in net assets 28,860 17,578
Total assets 58,121 43,788
Total liabilities 11,670 10,477
Net assets 46,451 33,311
Investment differential 972 972
Others (consolidated FS) 666 117
Profit (loss) for the period of Associates ₩ (968) ₩ (703)
Gwangyang Green Energy Co., Ltd [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation  
Location KOREA  
Percentage of ownership 20.00%  
Acquisition cost ₩ 2,000  
Book value [Abstract]    
Acquisition 2,000  
Share of income (loss) (228)  
Ending balance 1,772  
Share in net assets 1,754  
Total assets 20,165  
Total liabilities 11,393  
Net assets 8,772  
Investment differential 18  
Profit (loss) for the period of Associates ₩ (1,139)  
PND solar., Ltd [Member]    
Disclosure of associates [Line Items]    
Key operation activities Power generation  
Location KOREA  
Percentage of ownership 29.00%  
Acquisition cost ₩ 1,250  
Book value [Abstract]    
Acquisition 1,250  
Ending balance 1,250  
Share in net assets 1,096  
Total assets 10,508  
Total liabilities 6,729  
Net assets 3,779  
Investment differential 154  
Profit (loss) for the period of Associates ₩ (406)  
[1] The effective percentage of ownership is 21.57% considering treasury stocks.
[2] The Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors.
[3] The Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. The Company can exercise significant influence by its right to nominate directors to the board of directors of the entity.
[4] The Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. The Company can exercise significant influence by its right to nominate directors to the board of directors of the entity.
[5] The Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity.
[6] As of December 31, 2017, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power II Co., Ltd. and NH Bank. According to the shareholders’ agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power II Co., Ltd. and NH Bank with a certain rate of return, NH Power II Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership.
[7] As of December 31, 2016, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power II Co., Ltd. and NH Bank. According to the shareholders’ agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power II Co., Ltd. and NH Bank with a certain rate of return, NH Power II Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership.
[8] The Company’s percentage of ownership has decreased due to the acquisition of Daeryun Power Co., Ltd. and the effective percentage of ownership is 19.45% considering stock purchase options.
[9] The Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its influence on the entity.
[10] As of reporting date, the annual reporting period of all associates and joint ventures ends on December 31, except for Pioneer Gas Power Limited whose reporting period ends on March 31.
[11] Although the percentage of ownership temporarily decreased to 8.33% from the difference in timing of capital payment by shareholders, the Company can exercise significant influence by virtue of its right to appoint a director to the board of directors of the entity based on the shareholders’ agreement. The percentage of ownership is 25.00% at the time of completion of capital payment.
[12] The effective percentage of ownership is less than 20% but the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity and the fact that the dominant portion of the investee’s sales transactions is generated from the Company.
[13] The percentage of ownership decreased since the Company did not participate in the capital increase of Green Biomass Co., Ltd. during the period.
[14] The Company’s effective percentage of ownership excluding the redeemable convertible preferred stock is 25.54%.
[15] The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. For this reason, the entity is classified as an associate.
[16] The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. For this reason, the entity is classified as an associate.