Summary: The cost of a 15 MW energy storage power station typically ranges between $12 million to $27 million, depending on technology, location, and project complexity. This article breaks down pricing factors, industry tr nds, and real-world examples to help businesses evaluate energy sto hinking about installing a 15. When planning a 15-megawatt energy storage power station, costs typically range between $7 million to $18 million based on three critical factors: "The sweet spot for grid-scale storage currently sits between 10MW-20MW," notes a 2023 DOE report, "where economies of scale meet operational. How much does a 15 megawatt energy storage power station cost? 1. This represents a significant decline from previous years, driven by manufacturing scale and material efficiencies.