By ReutersSeptember 14, 20262:45 AM UTCUpdated agoA Samsung Electronics logo appears in this illustration taken August 25, 2025. REUTERS/Dado Ruvic/Illustration//File Photo Purchase Licensing Rights, opens new tabSEOUL, Sept 14 (Reuters) - Samsung Electronics (005930.KS), opens new tab and SK Hynix (000660.KS), opens new tab have rejected a proposal by Korea Electric ​Power Corp (015760.KS), opens new tab to make a 25 ‌trillion won ($18.7 billion) upfront payment to support power supplies for p...