[Amended] Supply contract signed

What happened

BHI / Single sales/supply contract signed / (2026.08.19) Single sales/supply contract signed

Amendment report (notice) Amendment date: 2026-08-19

1. Disclosure document being amended: Single sales/supply contract signed 2. Original filing date of the disclosure document being amended: 2026-03-11 3. Reason for amendment: Change in contract amount 4. Amendment items:

Item: 2. Contract details - Confirmed contract amount Before: Confirmed contract amount 56,576,139,200; Total contract amount (KRW) 56,576,139,200; % of revenue 14.0 After: Confirmed contract amount 54,913,822,792; Total contract amount (KRW) 54,913,822,792; % of revenue 13.6

Item: 10. Other matters for investment reference Before: "2. The contract amount is USD 38,414,000, applying an exchange rate of USD 1 = KRW 1,472.80 as of 2026-03-11." After: "2. The contract amount is USD 38,598,832 + EUR 276,000, applying exchange rates of USD 1 = KRW 1,411.00 and EUR 1 = KRW 1,633.59 as of 2026-08-19."

Single sales/supply contract signed 1. Details of the sales/supply contract: LNG combined-cycle power generation facility supply contract 2. Contract details: Conditional contract: Not applicable; Confirmed contract amount: 54,913,822,792; Conditional contract amount: -; Total contract amount (KRW): 54,913,822,792; Recent revenue (KRW): 404,741,038,609; % of revenue: 13.6 3. Counterparty: CHEC-HEI-THCC General Partner; Recent revenue: -; Main business: EPC; Relationship with company: -; Performance of same-type contract with company in last 3 years: Not applicable 4. Sales/supply region: Overseas 5. Contract period: start 2026-03-11; end 2029-02-13 6. Key contract terms: Down payment/advance payment: Yes; Payment terms, etc.: within 45 days from the invoice billing date 7. Sales/supply method: In-house production: applicable; Outsourced production: not applicable; Other: - 8. Contract (order) date: 2026-03-11 9. Disclosure deferral: deferral deadline -; reason - 10. Other matters for investment reference: 1. Recent revenue is based on the consolidated financial statements as of the end of fiscal year 2024. 2. The contract amount is USD 38,598,832 + EUR 276,000, applying exchange rates of USD 1 = KRW 1,411.00 and EUR 1 = KRW 1,633.59 as of 2026-08-19. 3. The contract period and amount may change depending on the progress of construction. ※ Related disclosures: -