Abstract
Conventional fossil energy will not be enough to meet the continuously increasing need for energy in the future. In this case, renewable energy sources will become important. Alternative energy sources are increasingly needed for energy in the future. Most electricity in the world is conventionally generated using coal, oil, natural gas, nuclear energy, or hydropower. Due to environmental concerns there is a growing interest in alternative energy sources for heat and electricity production. Some electricity production is done with alternative energy sources like biomass, geothermal, wind, and solar energy.