There may be a dip in power generation during the winter months, as there's more cloud cover and less direct sunlight. Still, there’s no reason to fret. Sunlight still strikes the surface of the Earth constantly. The National Oceanic and Atmospheric Administration estimates that 173,000 terawatts of solar energy hit the Earth simultaneously, all the time. For perspective, a regular electrical wall outlet generates 1800 watts, and a portable solar generator can produce up to 7,500 watts. That is a significant amount of energy to churn through.