Grid operators face mounting pressure to balance intermittent renewable generation with steady baseline load demands. Recent commercial pilots evaluating high-temperature thermal energy storage systems demonstrate round-trip electrical-to-thermal efficiency exceeding 85%.
Economics of Long-Duration Storage
Utilizing abundant, low-cost media such as crushed rock or liquid tin, thermal storage installations offer a lower capital expenditure per megawatt-hour compared to traditional lithium-ion utility installations, particularly for storage durations exceeding eight hours.