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Commitments for Expenditure (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | ₩ 56,408 | ₩ 56,183
Commitments for Expenditure balance | 24,721 | 37,309
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 45,390 | 44,315
Commitments for Expenditure balance | 32,876 | 31,801
Purchase of GIS (362KV 6300A 63KA) 23CB - YoungseoS/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 36,143 | 34,500
Commitments for Expenditure balance | 36,143 | 34,500
Purchase of GIS (362kV, 6300A, 63kA) 26CB - Hwasung S/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 40,010 | 29,143
Commitments for Expenditure balance | 15,300 | 18,194
Purchase of GIS (362KV 6300A 63KA) 27CB - KwangyangS/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 37,744 | 37,694
Commitments for Expenditure balance | 9,700 | 10,491
Purchase of Concrete Poles (10M, 350KGF) 121,900 and 6 others |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 133,387
Commitments for Expenditure balance | 0 | 13,343
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 3,504,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 66,240 | 66,240
Commitments for Expenditure balance | 0 | 38,998
Purchase of cable (FR CNCO-W,1C,325SQ) 1,400,000 |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 59,716 | 57,475
Commitments for Expenditure balance | 37,249 | 48,598
Purchase of switch (Eco) 9,360 units |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 40,631 | 40,631
Commitments for Expenditure balance | 24,031 | 34,797
Purchase of cable (TR CNCE-W/AL, 1C, 400SQ) 2,654,400M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 36,063 | 0
Commitments for Expenditure balance | 6,243 | 0
Construction of Shin-Kori units (#3,4) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 7,498,951 | 7,363,514
Commitments for Expenditure balance | 0 | 3,211
Construction of Shin-Kori units (#5,6) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 8,625,387 | 8,625,387
Commitments for Expenditure balance | 4,479,956 | 5,930,099
Construction of Shin-Hanul units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 8,306,149 | 7,982,342
Commitments for Expenditure balance | 0 | 355,704
Other 27 contracts |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 352,710 | 269,681
Commitments for Expenditure balance | 122,890 | 161,243
Service of designing Seoul Combined units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 30,778 | 29,996
Commitments for Expenditure balance | 2,119 | 4,744
Purchase of main machine for construction of Seoul Combined units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 331,249 | 365,164
Commitments for Expenditure balance | 15,918 | 51,165
Construction of Seoul Combined units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 387,722 | 285,890
Commitments for Expenditure balance | 31,150 | 27,125
Purchase of smoke eliminating machine for construction of Shin-Boryeong units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 157,618 | 172,609
Commitments for Expenditure balance | 0 | 13,986
Service of designing Shin-Boryeong units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 120,668 | 120,199
Commitments for Expenditure balance | 888 | 1,076
Purchase of main machine for construction of Shin-Boryeong units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 816,317 | 866,065
Commitments for Expenditure balance | 4,955 | 4,981
Purchase of furnace for construction of Shin-Seocheon thermal power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 305,209 | 305,209
Commitments for Expenditure balance | 43,388 | 74,631
Purchase of turbine generator for construction of Shin-Seocheon thermal power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 105,226 | 104,402
Commitments for Expenditure balance | 10,736 | 57,968
Electricity construction of Shin-Seocheon thermal power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 231,196 | 217,848
Commitments for Expenditure balance | 87,874 | 174,122
Purchase of main machine for Jeju LNG combined |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 166,287 | 166,287
Commitments for Expenditure balance | 12,088 | 11,272
Purchase of coal handling machine for construction of Taean (#9,10) and IGCC units (conditional contract for installation) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 205,764 | 205,764
Commitments for Expenditure balance | 282 | 282
Purchase of furnace for construction of Taean units (#9,10) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 556,206 | 556,504
Commitments for Expenditure balance | 17,579 | 18,502
Service of designing Taean units (#9,10) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 112,483 | 112,344
Commitments for Expenditure balance | 12,862 | 13,338
Purchase of turbine generator for construction of Taean units (#9,10) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 214,208 | 214,462
Commitments for Expenditure balance | 10,857 | 10,422
Purchase of oxygen plant for construction of Taean IGCC units |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 97,345 | 96,068
Commitments for Expenditure balance | 1,630 | 1,552
Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 104,600 | 0
Commitments for Expenditure balance | 104,600 | 0
Service of designing Taean IGCC plant units |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 46,101 | 46,001
Commitments for Expenditure balance | 2,332 | 3,161
Purchase of furnace for construction of Samcheok units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 1,066,824 | 1,092,287
Commitments for Expenditure balance | 11,771 | 12,215
Purchase of coal handling machine for construction of Samcheok units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 282,927 | 307,925
Commitments for Expenditure balance | 42,785 | 48,736
Purchase of turbine main equipment for Samcheok units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 223,550 | 212,188
Commitments for Expenditure balance | 132 | 348
Purchase of main equipment for Namjeju |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 138,486 | 146,594
Commitments for Expenditure balance | ₩ 84,982 | ₩ 134,949

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