TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Method: The step of heating a solution for use in electrolysis with heat from geothermal fluid and producing a heated solution is carried out by supplying the geothermal fluid to an indirect heat exchanger for transferring heat from the geothermal fluid to a solution for heating the solution. The method further comprises supplying the heated solution to apparatus for use of the heated solution in electrolysis for producing hydrogen; producing oxygen by electrolysis of the heated solution; utilizing the pressure of the oxygen for producing power; utilizing the pressure of the oxygen for producing power includes separating the geothermal fluid into geothermal steam and geothermal liquid, using the geothermal liquid to produce power and using the pressure of the oxygen in pumping geothermal liquid of the geothermal fluid; producing power using the oxygen or hydrogen. The step of utilizing the pressure of the hydrogen for producing power includes separating the geothermal fluid into geothermal steam and geothermal liquid, using geothermal liquid to produce power and using the pressure of the hydrogen in pumping geothermal liquid of the geothermal fluid.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: The heating apparatus comprises an indirect heat exchanger for transferring heat from the geothermal fluid to a solution for heating the solution. The apparatus further includes a supplying element of supplying the heated solution to the electrolysis means for producing hydrogen by electrolysis of the heated solution; a separator for separating the geothermal fluid into geothermal steam and geothermal liquid and a pump for pumping geothermal liquid of the geothermal fluid; power producing element that includes a vaporizer, vapor turbine, and condenser; supply element for supplying heat depleted geothermal liquid exiting the vaporizer to the indirect heat exchanger for heating the solution and producing the heated solution for electrolysis; element for producing oxygen by electrolysis of the heated solution; element for utilizing the oxygen for producing power; storage element for storing the oxygen for later use; element for utilizing the hydrogen for producing power; storage element for storing the hydrogen for later use; and apparatus for producing power using stored hydrogen stored in the storage element during period of peak electricity demand. The vaporizer is for vaporizing working fluid (preferably organic working fluid) present in the vaporizer and producing working fluid vapor using heat present in the geothermal liquid. The vapor turbine expands the working fluid vapor and producing power. The condenser condenses the expanded working fluid exiting the vapor turbine and producing working fluid condensate and a cycle pump for supplying the working fluid condensate to the vaporizer. The pump forces further heat depleted geothermal liquid exiting the indirect heat exchanger to an injection well.