According to Fortune Business Insights: The global thermal energy storage (TES) market is on a steady growth path, anchored by the worldwide push toward renewable energy integration and decarbonization. According to Fortune Business Insights (Report ID: FBI100748), the global thermal energy storage market size was valued at USD 2.51 billion in 2025 and is projected to grow from USD 2.61 billion in 2026 to reach USD 3.63 billion by 2034, exhibiting a CAGR of 4.2% during the forecast period. Europe dominated the market with a market share of 36.29% in 2025.
TES technology addresses one of the core challenges of renewable energy: intermittency. Solar energy is plentiful during the day, but demand often peaks in the evening. TES keeps excess energy — either as heat or cold — when it is available and releases it when needed. This capability makes it a cost-effective complement to solar, wind, and other clean energy sources.
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Urbanization leads to the development of more high-rise buildings, offices, malls, hospitals, and data centers, increasing the usage of air conditioning, heating, and cooling systems — usually at peak load periods. TES allows thermal energy to be stored in off-peak hours when electricity is cheaper and released during higher-demand periods, helping lower costs and relieve grid pressure. A recent example is The Riverie in New York, a two-tower residential development that deployed a vertical geoexchange system using 300 bored holes to harness thermal energy for heating, cooling, and amenity operations.
The ongoing expansion of solar and wind energy is fueling TES market growth. TES systems ease balancing issues by capturing and storing surplus renewable energy in the form of heat or cold, which may be released during high-demand and low-generation periods. In November 2024, a 100 MW thermal solar and molten salt energy storage plant in Xinjiang, China was connected to the grid as part of a USD 840 million renewable energy project — illustrating the scale of investment flowing into TES-integrated infrastructure.
Industries such as chemical, food processing, textiles, cement, and pharmaceuticals require large amounts of thermal energy for process heating, steam generation, and cooling. TES allows industries to charge during low-demand or low-cost periods and discharge at peak, improving efficiency, lowering operating costs, and enhancing energy resiliency. Growing regulatory and sustainability pressures are further compelling industrial users to adopt TES as a bridge to renewable-fueled operations.
TES systems such as molten salt tanks, chilled water storage, or underground boreholes require specialized materials, custom engineering, site preparation, and installation. These components significantly increase project costs — up to millions for large-scale or long-duration storage. A large-scale molten salt TES system for solar thermal plants can cost over USD 30–50 million, while even commercial ice storage systems may run into hundreds of thousands of dollars.
Many building owners, facility managers, and energy planners are not familiar with TES technology and the advantages it offers. This unfamiliarity leads to missed opportunities during design and retrofits, undervaluation of TES in smart energy projects, and a preference for more familiar solutions such as batteries. TES technologies often lack consistent performance benchmarks such as efficiencies, life expectancies, and safety certifications.
Import tariffs are adding cost uncertainty to the broader energy storage sector. Prices for four-hour battery systems have already increased 56% to 69% since January 2025, and significant tariff increases have injected considerable market uncertainty, leading developers and financiers to defer or reconsider investments in TES projects.