Cleaning before commissioning: two boilers in one shot!
A Combined Cycle Power Plant has two turbines. The first turbine is a gas turbine that is driven by burning, for example, natural gas. The second turbine is a steam turbine that is driven by the steam that is heated by the residual heat from the exhaust gases of the gas turbine (see the figure). Both turbines drive a generator where the electricity is produced. The electrical yield of this system is considerably higher (approx. 60 %) than when only one turbine is driven.