A new analysis from energy think tank Ember shows that utility-scale battery storage costs have fallen to $65 per megawatt-hour (MWh) as of October 2025 in markets outside China and the US. At that level, pairing solar with batteries to deliver power when it's needed is now.
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In this work we describe the development of cost and performance projections for utility-scale lithium-ion battery systems, with a focus on 4-hour duration systems. The projections are developed from an analysis of recent publications that include utility-scale storage .
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Over 10 years, higher-grade cabinets usually prove more economical when factoring in reliability and service.
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When choosing a high-voltage battery storage system, prioritize energy capacity, round-trip efficiency, and compatibility with your solar setup or grid requirements.
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