Abstract: Several embodiments are disclosed that enhance and improve the efficiencies of alternative electrical generating sources by converting electrical energy to potential energy through electro-mechanical means. The embodiments provide gravitational energy storage by lifting masses from lower to higher elevations during desired periods, such as when the generating sources are producing excess energy or when electrical rates are the least expensive. Energy storage is maintained until such time as it is need and then converted from potential mechanical energy to electricity by gravitational forces. By storing energy, one can supplement and enhance the efficiencies of producing electricity by alternative means such as wind and solar by expanding the times when electricity is available. Additionally, one can time-shift the purchase and use of commercial power by buying power to store energy when rates are low and using the stored energy when rates are high.