Operating results (preliminary) (fair disclosure)

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Korea District Heating Corp. / Operating (Preliminary) Results (Fair Disclosure) / (2026.07.27)

Operating (Preliminary) Results (Fair Disclosure) Reporting periods: current period 2026-06-01 to 2026-06-30; prior period 2025-05-01 to 2025-05-31 (as stated in the filing); same period last year 2025-06-01 to 2025-06-30; current year-to-date 2026-01-01 to 2026-06-30; prior year-to-date 2025-01-01 to 2025-06-30. Note: these figures are preliminary and may differ from the final confirmed figures.

1. Results (Unit: KRW 100 million, %) Sales, operating profit, pre-tax income from continuing operations, and net income for both the current period and year-to-date are not disclosed (shown as "-" in the filing).

Operating volumes: - Heat sales (thousand Gcal): current month (June 2026) 494; prior month (May 2026) 579, change -14.7%; same month last year (June 2025) 506, change -2.4%. - Chilled-water sales (thousand Gcal): current month 36; prior month 28, change +28.6%; same month last year 31, change +16.1%. - Electricity sales (GWh, sold via the Korea Power Exchange): current month 752; prior month 884, change -14.9%; same month last year 802, change -6.2%.

2. Information disclosure Provided by: Management Support Division, Finance Department, Treasury/IR Team Provided to: domestic and foreign institutional and general investors Disclosure date: 2026-07-27

3. Contact: Finance Department, Treasury/IR Team; phone 031-780-4262/4264

4. Other matters of reference for investment decisions * The above results are for June 2026 operations. * Electricity sales volume includes other sales such as district (private) electricity sales. * The sales figures above are estimates prepared under the Company's internal standards and may differ from actual figures after final settlement.