Shaft and Gallery Gravity Storage for Mars Settlements

This conceptual white paper evaluates shaft and gallery gravity energy storage as an emergency power reserve for Mars settlements during dust storms and other power shortfalls. Surplus electricity raises locally filled ballast modules, which are parked on fixed supports until needed. A regenerative hoist lowers the modules into an underground rail gallery to power selected critical loads. The concept examines how a settlement could reuse deep industrial excavation while keeping habitat access and emergency egress independent of ballast handling. In the illustrative 500 m reference case, each 50-tonne module delivers 18.11 kWh net after empty return, transfer, and buffer losses. The model requires 40 accessible modules to supply 10 kW for 72 Earth hours. With one kilometre of usable parking track at each elevation, modelled coverage at the same load reaches 12.5 Earth days with a 500 m drop or 25.5 Earth days with a 1,000 m drop. The paper examines hoist throughput, recharge time, and landed equipment mass. It proposes a 90-Earth-day standby test to assess whether the system can restart independently and sustain the critical load.