The Dublin Bay Power Plant is located on the Pigeon House Road in Ringsend, Dublin. The plant is a single shaft combined cycle unit equipped with a gas turbine, steam turbine, heat recovery steam boiler and electrical generator. It started commercial operation in August 2002 and has an output of 400MW.

The combined cycle plant is an integration of two types of prime mover - the gas turbine and the steam turbine - combining the advantages of both. The second cycle of energy from the same fuel is a more efficient use of natural resources. The plant’s main fuel is natural gas, although it will also have a dual fuel capacity to burn distillate oil.

Natural gas is piped into the plant and mixed with the compressed air in the gas turbine where continuous combustion and expansion takes place. The resultant expansion drives the gas turbine. The hot exhaust gas is then routed through a heat recovery steam generator (HRSG) to generate steam. The steam is used to drive a steam turbine and is then condensed back into water and recycled back to the boiler. Both steam and gas turbines are coupled together to drive the generator. Power from the generator is exported to the grid through underground cables.