Stupid question The solar energy available in watts per square meter at any distance d from the Sun can be calculated by the formula E 1366 d2 where d is measured in astronomical units The moon is 0 0026 AU from the earth would this mean that if 100 of the sun light is being preserved 1 square metre would optimally give 1366 0 0026 2 202 071 005 watts or 202 Megawatt Isn t this relatively much for 1 square metre I m certain I m just tired and did some stupid error in calculating