A combined cycle dual closed loop electric generating system, comprising: a gas turbine assembly comprising a combustion chamber, a compressor, a first pump, a first driveshaft, a gas turbine and a first generator; a steam turbine assembly comprising a second pump, a second driveshaft, a steam turbine and a second generator; a gas turbine loop capable of holding and conveying a gas turbine loop working fluid; a steam turbine loop capable of holding and conveying steam turbine loop working fluid; characterised in that said gas turbine loop and said steam turbine loop each comprise a closed loop system for conveying said gas turbine loop working fluid and said steam turbine loop working fluid through said gas turbine assembly and said steam turbine assembly without co-mingling said gas turbine loop working fluid and said steam turbine loop working fluid between one another; said gas turbine loop working fluid and said steam turbine loop working fluid comprising a liquid and a vapor at different stages within said gas turbine and steam turbine closed loops; said gas turbine loop working fluid circulates through the gas turbine assembly, the first pump and a first heat exchanger; said steam turbine loop working fluid circulates through the steam turbine assembly, the second pump and said first heat exchanger; said first heat exchanger transfers first heat energy from said gas turbine loop to said steam turbine loop; said gas turbine assembly generates a first portion of an electric output by burning H 2 and O 2 running said gas turbine and driving said first generator; and said steam turbine assembly generates a second portion of said electric output; and an electrolyzer is provided to generate H 2 and 0 2 and storage tanks (120, 122) are provided to store said H 2 and O 2 separately, prior to use by the gas turbine assembly. a gas turbine assembly comprising a combustion chamber, a compressor, a first pump, a first driveshaft, a gas turbine and a first generator; a steam turbine assembly comprising a second pump, a second driveshaft, a steam turbine and a second generator; a gas turbine loop capable of holding and conveying a gas turbine loop working fluid; a steam turbine loop capable of holding and conveying steam turbine loop working fluid; characterised in that said gas turbine loop and said steam turbine loop each comprise a closed loop system for conveying said gas turbine loop working fluid and said steam turbine loop working fluid through said gas turbine assembly and said steam turbine assembly without co-mingling said gas turbine loop working fluid and said steam turbine loop working fluid between one another; said gas turbine loop working fluid and said steam turbine loop working fluid comprising a liquid and a vapor at different stages within said gas turbine and steam turbine closed loops; said gas turbine loop working fluid circulates through the gas turbine assembly, the first pump and a first heat exchanger; said steam turbine loop working fluid circulates through the steam turbine assembly, the second pump and said first heat exchanger; said first heat exchanger transfers first heat energy from said gas turbine loop to said steam turbine loop; said gas turbine assembly generates a first portion of an electric output by burning H 2 and O 2 running said gas turbine and driving said first generator; and said steam turbine assembly generates a second portion of said electric output; and an electrolyzer is provided to generate H 2 and 0 2 and storage tanks (120, 122) are provided to store said H 2 and O 2 separately, prior to use by the gas turbine assembly.