The Sun is abut 4.5 billion years old now. It is about 300 degrees hotter and about 6% greater in radius than when it was first born. It will continue to increase, in temperature, luminosity and radius at about the same rate for about another 5 billion years.

Geothermal energy is the heat from the Earth. It's clean and sustainable. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma.

-summer

A typical solar panel produces about 200 watts of electricity based on the efficiency and size of what's installed. For example, if you have 25 panels installed, you may have an output of about 5 kilowatt hours (kWh).