Installation for producing electricity or mechanical power, comprising a combined cycle gas turbine, and CO2 capture and water electrolysis units

An installation for producing electricity or mechanical power, comprising:

• a combined cycle gas turbine unit comprising at least a gas turbine, a heat recovery steam generator, and a steam turbine, the gas turbine being adapted for receiving a fuel gas and a working fluid and for producing a first mechanical power and a flow of first flue gas, the heat recovery steam generator being adapted for receiving the flow of first flue gas and producing steam and a flow of second flue gas, and the steam turbine being adapted for receiving the steam and producing a second mechanical power,
• a splitter adapted for receiving and splitting the flow of second flue gas into at least a first gas flow and a second gas flow, a rate of the second gas flow divided by a rate of the flow of second flue gas defining a flue gas recirculation rate of the combined cycle gas turbine unit,
• a carbon capture and storage unit adapted for receiving the first gas flow and storing CO2 contained in the first gas flow,
• a renewable electricity production unit adapted for producing renewable electricity,
• an electrolysis unit adapted for receiving water and the renewable electricity, and for producing a hydrogen flow and an oxygen flow, the electrolysis unit being electrically connected to the combined cycle gas turbine unit or intended to be electrically connected to a local grid, and
• a mixing unit adapted for receiving at least the second gas flow and at least part of the oxygen flow, and for producing the working fluid,
• the installation being configured for switching at least between:
• a first operation mode, in which the renewable electricity production unit produces the renewable electricity, and the electrolysis unit uses at least some of the renewable electricity in order to produce the hydrogen flow and the oxygen flow, and
• a second operation mode, in which the renewable electricity production unit is idle, and the electrolysis unit uses electricity produced by the combined cycle gas turbine unit or taken from the local grid in order to produce the hydrogen flow and the oxygen flow.