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Geothermal energy and Solar energy are two different things. Geothermal energy is thermal energy from the core of the planet while Solar energy is the radiation energy from the Sun. I believe the question would imply Solar Thermal utilization on Mars.

On Mars, Solar energy is a lot lesser than earth. The radiation on Earth is at 1400 W/m2 while on Mars is only 600 W/m2. Solar energy can be harvest using Solar cell at 40% of what we would harvest on earth.

In the case of Solar Thermal, Despite lowered black body temperature, Green house gases is absented on Mars and the surface temperature is a lot colder than earth. A solar thermal plant could effectively harvest at 60% efficiency as it is on earth.

The very difference on Mars Solar Thermal and Earth version would be that Mars had little water, it could not use cooling tower in the same manner as on earth. The Heat rejection onto atmosphere would require large radiator in place of cooling tower. Reflects is necessary to enhance thermal efficiency since the solar density is lowered there.

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Q: How do you use geothermal solar on mars?
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