For years, India’s energy storage conversation has revolved almost entirely around lithium-ion batteries and pumped hydro. Quietly, though, a third contender is creeping into policy and boardroom discussions: storing energy not as charge but as heat itself.
Thermal energy storage, or TES, is based on a deceptively simple premise.
Rather than storing electricity directly, it captures surplus energy as heat or cold in materials such as molten salts, water, ceramics or phase-change compounds, and later releases it as power, warmth or cooling. Applications include concentrated solar power generation, renewable energy integration, district heating and cooling, industrial process heat, cold storage and grid-level peak management.
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