1. Active solar heating Clay Ponder

2. Active solar heating is using energy from the sun that is gathered by collectors and used to heat a building. More than 1million homes use active solar energy to heat there homes. It starts out with a solar collector mounted on the roof which captures the sun energy, then a liquid is heated, it is then pumped through a heat exchanger which heats water for the building.

3. Geothermal energy –Power from the Earth Geothermal energy-the energy from heat in earths crust. Geothermal plants pump heated water or steam to power a turbine that generates electricity,then the water is usually returned to the earths crust where it can be used again. U.S. is the leading producer. Worlds largest geothermal power plant is in California.