Basic Layout and Working of a Thermal Power Plant As majority of thermal power plants use coal as their primary fuel, this article is focused on a coal fired thermal power plant. Typical layout and working of a Thermal Power Plant A simplified layout of a thermal power station is shown below. Hydroelectric Power Plant : Layout, Working and Types Generation of electricity by hydropower (potential energy in stored water) is one of the cleanest methods of producing electric power. In 2012, hydroelectric power plants contributed about 16% of total electricity generation of the world. Hydroelectricity is the most widely used form of renewable energy.