Green Energy Storage: A Developing Technique to Store Excess Electricity with Bicarbonate Salts

Abstract

In this work a chemical energy storage facility is designed. Fluctuating energy can be normalized by storing the excess of energy in form of ammonium formate. When demand is high the reverse process can deliver constant electricity. The roundtrip efficiency of this design using existing technologies is 21 %. The capital and operational expenditures are €38 M and €10 M/y to generate 5 MW of constant power from a fluctuating energy source. The breakeven energy price after storage is €0.33/kWh. After future development this system should be capable to compete with alternative storage methods.