A thermodynamic closed hydraulic electric generating system consisting of pressurized tanks, containing gas and liquid volumes interconnected by pipes. The system has a minimum of two tanks, one for heating and one for cooling. The heating source is solar, thermal or chemical. One tank is heated while the other is cooled, causing a significant pressure difference between the two tanks. Once one tank is heated to its optimum temperature and the other is cooled to its lowest temperature, a pressure valve is activated opening a regulated gate valve allowing the liquid in the higher pressure tank to flow through the connecting pipes and through a generator to the tank with the lower pressure and generating electric power. Liquid flow will occur until the tanks' pressure system equalizes, then the system is reversed. Tanks are heated by solar energy by parabolic mirrors and cooled by liquid/gas. Heat sinks promote heating/cooling.