Alternative energy storage plants that stores electricity in the form of gravitational potential energy and that incorporates a concrete foundation, fixed frame structure, elevator shafts, motor generators, trolleys, and mobile masses, all for use by independent power producers, large scale utility providers and large industrial power users

'altern':1 'concret':19 'electr':7 'elev':24 'energi':2,14 'fix':21 'form':10 'foundat':20 'frame':22 'generat':27 'gravit':12 'incorpor':17 'independ':36 'industri':45 'larg':39,44 'mass':31 'mobil':30 'motor':26 'plant':4 'potenti':13 'power':37,46 'produc':38 'provid':42 'scale':40 'shaft':25 'storag':3 'store':6 'structur':23 'trolley':28 'use':34 'user':47 'util':41

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