ALTERNATIVE ENERGY We need alternative energy cause were running out of fossil fuels! Solar power is the conversion of sunlight. Solar power systems use lenses or mirrors to focus a large area of sunlight. Geothermal energy is thermal energy generated and stored in Earth. Geothermal is cost effective, reliable, sustainable, and environmentally friend. Wind is the flow of gases on a scale line. Short bursts of high speed wind are termed gusts. hydroelectricity is the term reffering to electricity genarated by hydropower. hydropower is produced in 150 countries. Biomass is biological material dervered from living. As a energy source, biomass can either be used directley to produce heat.