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Consolidated Subsidiaries - Summary of Consolidated Subsidiaries (Parentheticals) (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of subsidiaries [line items] |  |
Percentage of voting equity interests acquired | 100.00% |
KEPCO Engineering & Construction Company, Inc. |  |
Disclosure of subsidiaries [line items] |  |
Sale of shares held percentage |  | 14.77%
Percentage of Effective Percentage Ownership Holding In Subsidiary |  | 51.24%
PT. Cirebon Power Service |  |
Disclosure of subsidiaries [line items] |  |
Description of significant judgements and assumptions made in determining that entity controls another entity even though it holds less than half of voting rights | The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power under the shareholders’ agreement. |
Commerce and Industry Energy Co., Ltd. |  |
Disclosure of subsidiaries [line items] |  |
Description of significant judgements and assumptions made in determining that entity controls another entity even though it holds less than half of voting rights | The Company guarantees a certain return on investments in Commerce and Industry Energy Co., Ltd. for the financial investors holding such investments. The financial investors have a right to claim the Company to sell its shares in the entity, which can be exercised 36 months after the date of acquisition. |
J Wind First, LLC |  |
Disclosure of subsidiaries [line items] |  |
Description of significant judgements and assumptions made in determining that entity controls another entity even though it holds less than half of voting rights | Although the Company does not hold a stake as of December 31, 2024, considering the purpose and design of the structured entity, the Company is exposed to volatility in the profits of the structured entity. In addition, The Company has the ability to direct activities that can most significantly affect the operations of the structured entity, so it has been determined that the Company has control over the entity. |
Elara Energy Holdings, LLC |  |
Disclosure of subsidiaries [line items] |  |
Description of significant judgements and assumptions made in determining that entity controls another entity even though it holds less than half of voting rights | The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement. |

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- Definition The description of significant judgements and assumptions made when the entity determines that it controls another entity even though it holds less than half of voting rights. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 9 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_9_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The percentage of voting equity interests acquired in a business combination. [Refer: Total for all business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B64 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B64_c&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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