City-grid batteries require megawatt-days. Achieving meaningful greentech power storage would require grid-level battery systems that could store a minimum of four hours of power to cover the bulk of that daily high-demand period. Assuming that the technological improvements in the world of batteries that have unfolded since 1990 continue into 2026, the cost of a four-hour lithium grid storage system will be about $240 per megawatt-hour of capacity, or six times that of the standard combined-cycle natural gas plant, which is currently the most common electricity-generating asset in the United
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