Energy From The Sun.
It can be used for water heating, space heating, space cooling and process
heat generation. Almost all the energy on Earth comes from the Sun. If it
weren’t for the Sun, the Earth would be extremely cold and have no life. The
outer regions of the sun are hot gases, mostly hydrogen and helium, and its
surface temperature is about 6,000 degrees Celsius (about 11,000 degrees
Fahrenheit). 20 percent of the suns energy is absoberd in the atmosphere; 30 percent of it is reflected by the atmosphere, and 50 perecent of it hits Earth.
As you can here the suns energy gives off heat to the house with solar panels.