Thermal energy storage (TES) is the storage of for later reuse. Employing widely different technologies, it allows thermal energy to be stored for hours, days, or months. Scale both of storage and use vary from small to large – from individual processes to district, town, or region. Usage examples are the balancing of energy demand between daytime and nighttime, storing summer heat for winter heat.
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The System Advisor Model (SAM) is a performance and financial model designed to estimate the cost of energy for grid-connected power projects.
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A 1MW/4MWh system now costs ~$550,000—cheaper than building a new coal plant! Pro tip: Pair with Zambia's abundant solar for maximum ROI. Perfect for Copperbelt mines requiring 24/7 power.
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In 2025, the global average price of a turnkey battery energy storage system (BESS) is US$117/kWh, according to the Energy Storage Systems Cost Survey 2025 from BloombergNEF (BNEF), published last week (10 December). That was a 31% decline from 2024 numbers.
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