THERMAL POWER STATIONS THAT USE FOSSIL FUELS

Thermal power stations use fossil fuels to produce thermal energy.
Then the thermal energy is converted to mechanical energy, in order to generate electricity.

Combined-cycle power stations.
Electricity is generated in two systems:
1. Burns natural gas with compressed air, this produces superheated gases, which turn a turbine to generate electricity.
2.  Uses the hot gases from the first system and uses them to produce steam in a heat recovery boiler.
Then the steam turns a turbine to generate more electricity.