(Hong Kong, China / Research Release) SHINDEV Research notes that molten salt thermal energy storage (M-TES) is the most mature storage solution within concentrated solar power (CSP) applications. However, its penetration in China’s broader energy storage market remains at an early stage, leaving substantial room for expansion. With CSP project pipelines accelerating and commercial use cases emerging in coal-fired power flexibility retrofits, industrial heat recovery, and district heating, M-TES is moving from “demonstration” toward “scalable validation” and is increasingly viewed as a promising pathway in the long-duration energy storage (LDES) landscape.
As of end-2023, China’s cumulative installed capacity of MW-scale CSP projects reached approximately 588 MW. In addition, around 43 projects are under construction or planned, totaling roughly 4.8 GW—most designed with 8–16 hours of molten salt thermal storage. While demand visibility in CSP is clear, SHINDEV Research observes that newly added molten salt storage capacity still accounts for only around 1% of China’s total energy storage additions, indicating that broader market penetration remains limited.
SHINDEV Research highlights that M-TES offers a differentiated combination of advantages—wide operating temperature range, large temperature differential, high thermal storage density, strong heat-transfer performance, stable operation, and competitive cost structure—making it well-suited for large-scale, long-duration thermal storage.
Beyond CSP, the commercialization outlook is improving across a range of scenarios, including coal-fired power plant flexibility retrofits (thermal storage coupled with conventional units), industrial waste-heat recovery, district heating, and steam supply stabilization. In particular, M-TES can be deeply integrated into conventional thermal systems through a “store heat—release heat—generate steam—deliver power/heat” pathway, enabling enhanced flexibility for grid balancing and creating potential participation opportunities in ancillary service markets.
With higher renewable penetration and increased intermittency, demand for long-duration flexibility is rising rapidly. SHINDEV Research believes molten salt storage is a natural complement to CSP, as CSP plants are characterized by long-duration, large-capacity dispatchability—allowing smoothing of renewable fluctuations over longer time horizons and improving grid reliability. As CSP deployment accelerates in northwestern China, associated molten salt demand could also enter a phase of concentrated release.
Despite improving momentum, SHINDEV Research cautions that scaling M-TES will require addressing several structural constraints:
High upfront capital expenditure: investment intensity is comparable to pumped hydro and compressed-air energy storage, raising requirements for financing capability and bankable revenue models.
Material supply constraints: certain key raw materials are not yet fully self-sufficient domestically, limiting cost control and supply stability.
Standards and quality systems still evolving: molten salt chemistry, engineering quality, operation, and safety management demand robust and unified standards across construction, testing, and safety compliance to mitigate systemic risks during scale-up.
SHINDEV Research recommends that industry participants accelerate localization of critical materials, drive innovation in materials and processes, and push forward engineering standardization and safety frameworks to improve replicability and financeability.
Looking ahead, SHINDEV Research expects three major trends for M-TES:
Standardization via modular design, standardized EPC delivery, and mature O&M practices;
Diversification through hybridization with electrochemical storage and compressed-air systems;
Decentralization and intelligence as distributed energy systems expand—where M-TES, integrated with IoT and AI-enabled scheduling tools, could evolve into flexible multi-energy integrated solutions.
Molten salt thermal energy storage has proven maturity in CSP and is now unlocking new commercialization pathways in coal retrofit, heating, and industrial heat recovery. While penetration remains low and challenges persist in capex, supply chain, and standards, rising long-duration storage demand and supportive policy direction suggest that M-TES may enter a scalable growth window—becoming an important complementary storage pathway in China’s energy transition.
