A nuclear power plant produces 1.2 GW of electric power at a system efficiency of 20%. The plant rejects heat into a river, and it leaves the plant at a relatively warm temperature of 80°C. Since this is still above the river temperature of 20ºC, it is possible to use this temperature difference to drive another power cycle. What is the Carnot efficiency for this additional cycle? Assuming the actual device has an efficiency of half of the Carnot efficiency, how much additional electric power would be generated?