War taking place at the same time, not much is known about this particular installation. Another binary cycle geothermal power plant was taken into operation in 1967 near Petropavlovsk on the Kamchatka peninsula, Russia. It was rated at 670 kW and ran for an unknown number of years, proving the concept of binary cycle geothermal power plants. As of December 2014, there were 203 binary cycle geothermal power plants across 15 countries worldwide, representing 35% of all geothermal power plants, but only generating 10.4% of total geothermal power (about 1250 MW). Variations Dual pressure The working fluid is evaporated at two different pressure levels, and thus temperatures. This improves efficiency by reducing exergetic losses in the primary heat exchanger by maintaining a closer match between the geofluid cooling curve and the working fluid heating curve. Dual fluid Two secondary cycles are operated in tandem, each with a separate working fluid and boiling point. This improves efficiency by reducing the exergetic losses of the heat introduction process, by ensuring a closer match between the geofluid cooling curve and the working fluids' heating curves. Performance The performance of a simple binary cycle and its individual components can be calculated as follows: Turbine is the rate of work done by the turbine, in kW is the mass flow rate of working fluid, in kg/s is the turbine efficiency, non-dimensional is the specific enthalpy of the working fluid at the turbine inlet, in kJ/kg is the specific enthalpy of the working fluid at the turbine outlet, assuming isentropic expansion in the turbine, in kJ/kg Condenser The equation below can be used to determine the condenser duty and mass flow rate of coolant required. is the rate of heat removed from the working fluid in the condenser, in kW & are the specific enthalpy of the working fluid at the condenser inlet and outlet respectively, in kJ/kg is the mass flow rate of coolant, in kg/s & are the specific enthalpy of coolant at the condenser inlet and outlet respectively, in kJ/kg Feed Pump is the rate of work done by the pump to repressurise the working fluid, in kW is the specific enthalpy of the working fluid at the feed pump outlet, assuming isentropic compression, in kJ/kg is the specific enthalpy of the working fluid at the feed pump inlet, in kJ/kg is the pump efficiency, non-dimensional Primary Heat Exchanger The equation below can