fuel rolebiofuel power unitbiogas power unitcarbon dioxidechemical energycoal power unitelectric heat pumpelectro motive generatorenergy converting componentenergy storagefossil combustion fuelfuel cellgas fired power unitgeothermal power unitgreenhouse gashard coal power unithydrogen power unitlignite power unitmethanenitrogen trifluoridenitrous oxidenuclear energy carrier dispositionnuclear power unitoil power unitpower plantphotovoltaic cellrenewable fuelsolar power unitsolar thermal power unitsolid biomass power unitsulphur hexafluorideuraniumwaste power unitwaste rolewindwind energy converting unitproduceragentairair pollution