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Combined cycle gas plants use both the heat and steam as well.

A simple cycle gas plant does not use steam like the others: it works similar to a jet engine where natural gas is ignited and burned and the heat creates pressure that turns the turbine.

Fossil fuel power plants burn their fuel in order to create the thermal energy to run their external heat engines.This creates relative (continuos) motion between a coil of wire and a magnet, which pushes electrons and starts the flow of electricity. As the turbine begins to spin, it causes giant wire coils inside the generator to turn. The highly pressurized steam then travels through pipes to rotate the fan-like blades of a turbine (see Rankine cycle for more info). Most thermal power plants use fuel to heat up water from a reservoir, which generates steam(usually at a high pressure).