BANGKOK, April 23 (Reuters) - Thai Airways International THAI.BK will raise its fuel surcharge by 20-25 percent on Monday to offset rising energy costs, a senior executive said on Wednesday. Oil prices CLC1 held above $118 a barrel on Wednesday after briefly hitting an all time peak of $119.90 on Tuesday. "We will raise fuel surcharges on all routes by 20-25 percent on average due to rising oil prices," Thai Airways Executive Vice President Pandit Chanapai told reporters.