Samui's power system went out on Tuesday, prompting each of big business operators to stock up 3,000-6,000 litres of diesel for their power generators.
The company said that the the 10 trucks have already loaded about 150,000 litres to the five stations on the island and another shipment is due early morning tomorrow.
PTT said that the company is closely monitoring the situation and will ensure adequate fuel supply until the island's power is back.