New gravity battery design could store renewable power in skyscrapers

Researchers at the University of Waterloo have developed a novel gravity-based energy storage system designed for high-rise buildings to store renewable energy efficiently. This system integrates photovoltaic (PV) facades on multiple building sides, small rooftop wind turbines, lithium-ion batteries, and a rope-hoist gravity storage mechanism. Excess electricity generated by the PV panels and wind turbines is used to lift a heavy mass—typically steel or concrete blocks—within a vertical shaft, storing energy as gravitational potential. When energy demand rises or renewable production falls, the mass is lowered to drive a generator, converting the stored potential energy back into electricity. The lithium-ion batteries serve primarily for rapid response during sudden surpluses or shortages. The researchers employed a multi-objective optimization framework to minimize both the levelized cost of electricity (LCOE) and grid dependency (GD) across 625 parametric building designs varying in energy use intensity (EUI) and geometric configurations. The system demonstrated LCOE values between $0.051 and $