Potential Geothermal Energy

Mars is geologically less active than Earth but not dead. MAVEN discovered ongoing volcanic-style chemistry, and Tharsis and Elysium show geological ages of <100 million years in some areas. InSight's HP³ heat probe (despite not penetrating deeply enough) measured heat flow suggesting Mars has cooled significantly. For practical ISRU purposes, geothermal power on Mars is theoretical — nuclear fission power is more reliable. However, subsurface brines or hydrothermal vents near Tharsis remain astrobiologically interesting.

If accessible — geothermal could power crewed outposts without nuclear or solar dependence