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Summary of financial information of consolidated subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Korea Hydro & Nuclear Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets ₩ 55,792,704 ₩ 55,011,096
Total liabilities 30,484,104 29,252,816
Sales 8,858,717 9,415,751
Profit (loss) for the period (137,613) 854,346
Korea South-East Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 9,997,758 9,879,577
Total liabilities 4,948,553 4,844,184
Sales 5,521,038 5,387,846
Profit (loss) for the period 25,736 130,371
Korea Midland Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 10,839,218 9,893,822
Total liabilities 7,088,013 6,148,173
Sales 4,368,467 4,167,009
Profit (loss) for the period (38,142) 104,591
Korea Western Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 9,902,752 9,660,426
Total liabilities 5,965,410 5,739,534
Sales 4,841,261 4,199,079
Profit (loss) for the period (28,157) 110,939
Korea Southern Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 9,810,985 9,648,741
Total liabilities 5,463,721 5,401,216
Sales 5,539,793 4,397,552
Profit (loss) for the period 55,439 98,817
Korea East-West Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 8,744,380 8,855,518
Total liabilities 4,092,460 4,204,187
Sales 4,933,525 4,644,330
Profit (loss) for the period 3,345 217,599
KEPCO Engineering & Construction Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 771,480 762,166
Total liabilities 310,100 305,134
Sales 433,701 490,193
Profit (loss) for the period 12,937 21,222
KEPCO Plant Service & Engineering    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,275,365 1,195,086
Total liabilities 296,428 294,689
Sales 1,239,604 1,232,113
Profit (loss) for the period 160,791 135,482
KEPCO Nuclear Fuel    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 817,416 792,187
Total liabilities 434,439 421,088
Sales 230,667 279,664
Profit (loss) for the period 15,835 4,557
KEPCO KDN    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 566,807 524,520
Total liabilities 159,423 155,715
Sales 622,154 619,470
Profit (loss) for the period 60,016 48,968
Garolim Tidal Power Plant    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 608 619
Total liabilities 345 345
Sales 0 0
Profit (loss) for the period (11) (12)
KEPCO International HongKong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 140,101 153,529
Total liabilities 1 1
Sales 0 0
Profit (loss) for the period 3,307 4,380
KEPCO International Philippines    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 107,948 102,323
Total liabilities 1,475 886
Sales 0 0
Profit (loss) for the period 52,539 47,201
KEPCO Gansu International    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 12,047 11,567
Total liabilities 515 493
Sales 0 0
Profit (loss) for the period (24) (29)
KEPCO Philippines Holdings    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 188,551 127,922
Total liabilities 9,775 2,621
Sales 0 0
Profit (loss) for the period 53,219 43,218
KEPCO Philippines Corporation    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 6,394 6,293
Total liabilities 213 114
Sales 0 0
Profit (loss) for the period 54 2,098
KEPCO Ilijan Corporation    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 431,444 474,624
Total liabilities 53,413 57,801
Sales 99,844 109,183
Profit (loss) for the period 49,631 66,320
KEPCO Lebanon SARL    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,509 1,069
Total liabilities 9,686 9,281
Sales 0 0
Profit (loss) for the period 413 (219)
KEPCO Neimenggu International    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 194,336 165,937
Total liabilities 0 0
Sales 0 0
Profit (loss) for the period 20,829 500
KEPCO Shanxi International    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 519,991 497,990
Total liabilities 201,732 193,309
Sales 0 0
Profit (loss) for the period 290 3,796
KOMIPO Global Pte    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 250,456 225,411
Total liabilities 961 1,497
Sales 0 0
Profit (loss) for the period 11,478 21,858
KEPCO Canada Energy    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets   132
Total liabilities   22
Profit (loss) for the period   (32)
KEPCO Netherlands B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 130,460 114,911
Total liabilities 77 49
Sales 0 0
Profit (loss) for the period 26,550 17,309
KOREA Imouraren Uranium Investment Corp.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 63,517 151,278
Total liabilities 171 131
Sales 0 0
Profit (loss) for the period (89,852) 1,490
KEPCO Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 439,719 466,654
Total liabilities 14 569
Sales 0 0
Profit (loss) for the period 49 (568)
KOSEP Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 37,057 27,076
Total liabilities 2,832 333
Sales 20,294 12,096
Profit (loss) for the period 7,315 1,601
KOMIPO Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 39,066 31,441
Total liabilities 4,659 4,691
Sales 20,294 12,096
Profit (loss) for the period 7,193 1,133
KOWEPO Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 39,341 31,586
Total liabilities 4,702 4,691
Sales 20,294 12,096
Profit (loss) for the period 7,316 1,232
KOSPO Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 36,525 29,472
Total liabilities 3,585 4,221
Sales 20,294 12,096
Profit (loss) for the period 9,520 (2,759)
KEPCO Middle East Holding Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 101,201 95,812
Total liabilities 92,862 90,842
Sales 0 0
Profit (loss) for the period 3,043 2,913
Qatrana Electric Power Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 484,383 460,206
Total liabilities 326,486 327,401
Sales 18,766 18,892
Profit (loss) for the period 21,170 23,310
KHNP Canada Energy    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 49,776 51,994
Total liabilities 35 31
Sales 0 0
Profit (loss) for the period (26) (92)
KEPCO Bylong Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 254,398 242,364
Total liabilities 315,921 277,549
Sales 0 0
Profit (loss) for the period (29,573) 20,271
Korea Waterbury Uranium Limited Partnership    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 20,890 20,886
Total liabilities 142 136
Sales 0 0
Profit (loss) for the period (74) (59)
Korea Electric Power Nigeria    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 112 238
Total liabilities 39 76
Sales 727 2,164
Profit (loss) for the period (93) 29
KEPCO Holdings de Mexico    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 248 235
Total liabilities 57 30
Sales 0 0
Profit (loss) for the period (11) (20)
KST Electric Power Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 535,807 546,242
Total liabilities 457,867 478,230
Sales 109,735 120,126
Profit (loss) for the period 10,274 16,154
KEPCO Energy Service Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,940 1,793
Total liabilities 1,454 451
Sales 5,117 6,773
Profit (loss) for the period (232) 976
KEPCO Netherlands S3 B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 46,642 46,642
Total liabilities 53 53
Sales 0 0
Profit (loss) for the period 2,382 2,382
PT. KOMIPO Pembangkitan Jawa Bali    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 11,405 11,261
Total liabilities 5,472 4,769
Sales 20,320 20,956
Profit (loss) for the period 3,925 4,666
PT. Cirebon Power Service    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,588 2,808
Total liabilities 273 155
Sales 7,228 7,439
Profit (loss) for the period 177 592
KOWEPO International Corporation    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 0 0
Total liabilities 8 8
Sales 0 0
Profit (loss) for the period 0 (2)
KOSPO Jordan    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 16,315 24,077
Total liabilities 3,432 13,594
Sales 34,371 7,331
Profit (loss) for the period 1,907 953
EWP Philippines Corporation    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,684 1,708
Total liabilities 829 836
Sales 0 0
Profit (loss) for the period (11) (17)
EWP America    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets [1] 72,525 79,854
Total liabilities [1] 4,903 67,308
Sales [1] 29,557 23,543
Profit (loss) for the period [1] (4,483) (9,737)
KNF Canada Energy Limited    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,801 1,884
Total liabilities 20 31
Sales 0 0
Profit (loss) for the period (45) (43)
PT KEPCO Resource Indonesia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets   491
Total liabilities   0
Sales   0
Profit (loss) for the period   (311)
EWP Barbados 1 SRL    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 268,033 235,096
Total liabilities 1,581 450
Sales 688 0
Profit (loss) for the period 11,221 (2,585)
Gyeonggi Green Energy    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 293,812 282,408
Total liabilities 185,043 199,160
Sales 96,442 95,192
Profit (loss) for the period 25,121 3,203
PT. Tanggamus Electric Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 216,321 179,317
Total liabilities 187,502 160,144
Sales 26,832 34,281
Profit (loss) for the period 9,338 4,640
Gyeongju Wind Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 122,303 112,279
Total liabilities 83,348 82,124
Sales 21,906 7,219
Profit (loss) for the period 8,803 2,400
KOMIPO America    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 10,092 10,505
Total liabilities 572 521
Sales 0 0
Profit (loss) for the period (885) 2,071
KOSEP USA INC.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1 184
Total liabilities 4,857 9,065
Sales 0 0
Profit (loss) for the period 4,341 26,997
PT. EWP Indonesia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 7,444 2,035
Total liabilities 14 23
Sales 0 0
Profit (loss) for the period 3,138 1,916
KEPCO Netherlands J3 B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 115,978 122,612
Total liabilities 77 76
Sales 0 0
Profit (loss) for the period (104) 12,115
Korea Offshore Wind Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 216,114 190,195
Total liabilities 36,377 1,985
Sales 0 0
Profit (loss) for the period (8,473) (6,997)
Global One Pioneer B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 162 151
Total liabilities 87 38
Sales 0 0
Profit (loss) for the period (113) (80)
Global Energy Pioneer B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 325 309
Total liabilities 74 41
Sales 0 0
Profit (loss) for the period (102) (87)
Mira Power Limited    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 277,525 208,150
Total liabilities 213,104 163,198
Sales 0 0
Profit (loss) for the period (980) 737
KOSEP Material    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,862 2,751
Total liabilities 1,249 1,448
Sales 3,240 3,128
Profit (loss) for the period 377 320
Commerce and Industry Energy    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 92,872 99,129
Total liabilities 88,009 87,926
Sales 27,937 30,577
Profit (loss) for the period (6,091) (749)
KEPCO Singapore Holdings Pte.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 582 3,265
Total liabilities 9 4
Sales 0 0
Profit (loss) for the period (31) (24)
KOWEPO India Private Limited    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets   781
Total liabilities   0
Sales   0
Profit (loss) for the period   (46)
KEPCO KPS Philippines Corp.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 7,501 6,636
Total liabilities 358 235
Sales 4,815 6,840
Profit (loss) for the period 766 555
KOSPO Chile SpA    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 139,814 133,570
Total liabilities 57,502 50,109
Sales 0 0
Profit (loss) for the period 1,016 1,066
PT. KOWEPO Sumsel Operation and Maintenance Services    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,313 1,350
Total liabilities 394 279
Sales 4,343 7,651
Profit (loss) for the period (654) 659
HeeMang Sunlight Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 10,915 6,876
Total liabilities 7,626 3,395
Sales 146 105
Profit (loss) for the period (192) (229)
Fujeij Wind Power Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 217,796 165,636
Total liabilities 212,435 156,099
Sales 0 0
Profit (loss) for the period (1,033) 8,836
KOSPO Youngnam Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 413,472 412,785
Total liabilities 325,589 333,302
Sales 369,669 68,973
Profit (loss) for the period 8,155 939
HI Carbon Professional Private Special Asset Investment Trust 1    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,002 3,002
Total liabilities 0 0
Sales 0 0
Profit (loss) for the period 12 12
Chitose Solar Power Plant LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 115,505 136,098
Total liabilities 105,079 121,622
Sales 15,022 7,083
Profit (loss) for the period 872 4,100
KEPCO Energy Solution    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 304,103 313,401
Total liabilities 849 12,376
Sales 5,584 5,544
Profit (loss) for the period 2,532 1,325
Solar School Plant    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 204,282 201,482
Total liabilities 1,366 599
Sales 1,149 67
Profit (loss) for the period 2,033 874
KOSPO Power Services Limitada    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,045 3,901
Total liabilities 596 887
Sales 9,610 11,067
Profit (loss) for the period 1,132 666
Energy New Industry Specialized Investment Private Investment Trust    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets [2] 66,498 506,207
Total liabilities [2] 1,014 2,118
Sales [2] 0 0
Profit (loss) for the period [2] (1,140) 52
KOEN Bylong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,544 5,875
Total liabilities 26 0
Sales 0 0
Profit (loss) for the period (10) 0
KOMIPO Bylong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,544 5,875
Total liabilities 26 0
Sales 0 0
Profit (loss) for the period (25) 0
KOWEPO Bylong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,544 5,875
Total liabilities 26 0
Sales 0 0
Profit (loss) for the period 0 0
KOSPO Bylong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,544 5,875
Total liabilities 26 0
Sales 0 0
Profit (loss) for the period (25) 0
EWP Bylong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,544 5,875
Total liabilities 26 0
Sales 0 0
Profit (loss) for the period (15) 0
KOWEPO Lao International    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,800 3,259
Total liabilities 1,015 1,452
Sales 2,899 3,624
Profit (loss) for the period 895 1,881
KEPCO US    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 16,640 16,913
Total liabilities 0 0
Sales 0 0
Profit (loss) for the period 6 0
KEPCO Alamosa    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 32,346 33,144
Total liabilities 79 492
Sales 750 0
Profit (loss) for the period (688) (218)
Cogentrix Solar Services    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 64,223 84,458 [3]
Total liabilities 48,819 53,116 [3]
Sales 9,015 8,958 [3]
Profit (loss) for the period 200 (112) [3]
KEPCO-LG CNS Mangilao Holdings    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 25,642 24,131
Total liabilities 27,197 24,395
Sales 0 0
Profit (loss) for the period (1,144) (278)
Mangilao Investment    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 25,641 24,131
Total liabilities 0 0
Sales 0 0
Profit (loss) for the period 0 0
KEPCO-LG CNS Mangilao Solar    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 25,406 24,002
Total liabilities 146 134
Sales 0 0
Profit (loss) for the period (104) (278)
Jeju Hanlim Offshore Wind Co    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 16,557 36
Total liabilities 328 0
Sales 0 0
Profit (loss) for the period (925) 0
PT. Siborpa Eco Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 12,363 11,562
Total liabilities 141 214
Sales 0 0
Profit (loss) for the period (1,771) ₩ (518)
PT. Korea Energy Indonesia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,183  
Total liabilities 60  
Sales 1,459  
Profit (loss) for the period 223  
KOLAT SpA    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 38,362  
Total liabilities 474  
Sales 585  
Profit (loss) for the period (186)  
KEPCO California, LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 42,171  
Total liabilities 21  
Sales 0  
Profit (loss) for the period (332)  
KEPCO Mojave Holdings, LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 103,189  
Total liabilities 65,730  
Sales 0  
Profit (loss) for the period (3,959)  
Incheon Fuel Cell Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 23,626  
Total liabilities 415  
Sales 0  
Profit (loss) for the period (201)  
KOEN Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 583  
Total liabilities 31  
Sales 0  
Profit (loss) for the period (48)  
KOMIPO Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 576  
Total liabilities 17  
Sales 0  
Profit (loss) for the period (41)  
KOWEPO Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 750  
Total liabilities 227  
Sales 0  
Profit (loss) for the period (77)  
KOSPO Service Co., Ltd    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 576  
Total liabilities 6  
Sales 0  
Profit (loss) for the period (30)  
EWP Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 667  
Total liabilities 97  
Sales 0  
Profit (loss) for the period (30)  
PT. KOMIPO Energy Indonesia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,236  
Total liabilities 0  
Sales 0  
Profit (loss) for the period ₩ 0  
[1] Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield Power, LLC, California Power Holdings, LLC, and EWPRC Biomass Holdings, LLC.
[2] Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1 and Songhyun e-New Industry Fund.
[3] Financial information of Cogentrix Solar Services, LLC includes that of two other subsidiaries, Solar Investments I, LLC and KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC).