If a geothermal plant runs at one-third its Carnot efficiency, how much more heat will be added to the atmosphere than from a fossil-fuel plant operating at two-thirds Carnot efficiency? Take the condenser temperature to be 27 degrees Celsius (300 K) for both systems; for the geothermal plant the boiler temperature is at 150 degrees Celsius, and for the fossil plant it is 550 degrees Celsius. Assume the electrical output from both plants is the same.
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Wasted as low-grade low-temperature waste-heat.
All thermoelectric (steam) generation, wastes about half of its
incoming energy as waste heat, due to Carnot efficiency thermodynamics.