Solar energy is free from the sun, and has been used since ancient times as the drying or baking products. The challenge to the water heater, etc. I have tried to make solar electricity. Solar crash, the average of 4-5 kW - hours. Per square meter per day If solar energy conversion efficiency of 15 percent, the first solar electric power sesame square meters can produce approximately 650 - 750 watts - hours per square meter per day. Thailand's electricity consumption is about 250 million kilowatt - hours per day. We can use an area of approximately 1,500 square kilometers, 0.3 percent of the country. It will produce more as needed.