“Solar panels on house roof” by Gray Watson is licensed under CC BY-SA 3.0 The process of producing electric energy by transforming other forms of energy; also, the

Image Courtesy: Gretar Ívarsson thermal energy generated and stored in the Earth, that can be used to heat a home or generate electricity. Pros Free fuel source.

“Filling the car with gasoline at the gas station” by Marco Verch is licensed under CC BY 2.0 a colorless petroleum-derived flammable liquid that is used primarily as a fuel in spark-ignited internal

“Heat Pump” by Kristoferb is licensed under CC BY-SA 3.0 moves thermal energy in the opposite direction of spontaneous heat transfer, by absorbing heat from a cold space and releasing

“ETI-FS Loop Diagrams” by WGisol is licensed under CC BY-SA 4.0 a central heating and/or cooling system that leverages the refrigeration cycle to transfer heat to or from

“Toyota Mirai fuel cell stack and hydrogen tank SAO 2016 9032” by Mariordo (Mario Roberto Durán Ortiz) is licensed under CC BY-SA 4.0 an essentially zero-emission fuel that produces water

“Oulu Hydro Energy” by Hteink.min is licensed under CC BY-SA 3.0 kinetic energy in flowing water, which is used to spin a generator that creates electricity. The most

Image Courtesy: U.S. Environmental Protection Agency, 2011 a complex mix of different gases created by the action of microorganisms within a landfill. Landfill gas is approximately forty to sixty

Image Courtesy: U.S. Department of Energy defined by DOE as ”a group of interconnected loads and distributed energy resources within clearly defined electrical boundaries that acts

“Sp apagão” by Júlio Boaro is licensed under CC BY-SA 2.0 any interruption in the generation, transmission, or distribution of electric energy. Compare planned power outages (i.e. scheduled