Looking back on the development history of the energy storage industry over the past 25 years, in the first 15 years, the industry was in a development stage dominated by traditional energy sources. The overall scale was relatively small and the application scenarios were limited, mainly serving as an auxiliary service function for the power grid. In the past decade, the installed capacity of wind power and photovoltaic power has soared rapidly, and energy storage has become an important supporting component for the consumption of new energy. Thus, the industry has entered a high-speed growth phase. Ye Zi predicts that in the coming decades, the market size of long-duration energy storage will grow explosively along with the installation capacity of wind and solar new energy. 

There is currently no unified duration standard for long-duration energy storage (LDES) in the industry. Currently, the industry generally defines energy storage systems with a continuous charging and discharging duration of more than 4 hours as long-duration energy storage. Domestic policies have also been continuously strengthened to promote the large-scale implementation of large-capacity long-duration energy storage technologies. The National Development and Reform Commission and the National Energy Administration issued the "Action Plan for Large-scale Construction of New Energy Storage (2025-2027)" in August 2024, clearly stating that it encourages the development of innovative application models such as hybrid new energy storage and long-duration energy storage. 

Compared with short-term energy storage, long-term energy storage has significant advantages: the duration of charging and discharging is wide, the system capacity is high, and the unit electricity cost is lower. Such energy storage systems can achieve long-term power supply within a day, across days, weeks, months, and even across seasons; by relying on an extremely large installed capacity, they can also effectively spread the cost per kilowatt-hour, thereby enhancing the economic benefits of the project. 

Meanwhile, Ye Zi also admitted that long-term energy storage is not simply about extending the discharge duration. The industry is facing three core challenges: high reliability, high integration, and efficient delivery of large-scale projects. To address these challenges, the industry needs to break through in three directions: first, significantly reduce the number of integrated battery cells per station; second, continuously improve the level of system integration; and third, simultaneously upgrade product manufacturing and project delivery capabilities. 

When it comes to the economic viability of long-duration energy storage projects, Ye Zi analyzed that the installed capacity of 4-hour duration energy storage projects in China has grown rapidly. Considering the capacity-based electricity price policies in various regions, 4-hour and longer-duration energy storage projects have better revenue performance. However, the revenue of 8-hour energy storage projects needs to be determined based on the region and application scenarios: in areas with high penetration of wind and solar power and where there is a phenomenon of negative electricity prices for 6 to 8 hours, the profit level of 8-hour energy storage is significantly higher than that of short-duration energy storage. 

He added that the value of 8-hour energy storage goes beyond the lower cost of electricity storage. As an important power infrastructure, it can enhance the stability of the power grid and meet the daily power dispatching needs. This aspect of grid security value cannot be simply measured by economic benefits. 

From the perspective of technical routes, the mainstream technologies for long-duration energy storage currently include compressed air energy storage, thermal energy storage, and liquid flow batteries. Haiden Energy Storage is a core player in the lithium battery long-duration energy storage sector and is also an enterprise with relatively advanced layout actions in the industry. The company entered the long-duration energy storage sector three years after its establishment, earlier than when the industry reached a consensus. 

In December 2024, Haichen Energy Storage launched the ∞Cell series of 1175Ah and 587Ah high-capacity battery cells and the corresponding 6.25MWh energy storage system. This product will be mass-produced in 2025 and delivered globally. In December 2025, the company released multiple industry-leading products in a row: the world's first native 8-hour energy storage solution, 8-hour energy storage dedicated battery cells, and the lithium-sodium collaborative all-time energy storage solution ∞PowerSolutionsforAlDataCenter for intelligent computing centers. 

At the SNEC 2026 exhibition this year, the real machine of Haichen Energy Storage's ∞Power 6.9MWh system was officially unveiled. This system is equipped with 1300Ah long-duration energy storage dedicated cells. It is designed based on the original design of the cells and can achieve a capacity of over 6.9MWh and stable discharge for 8 hours within a standard 20-foot container. The designed service life can reach 25 years. The equipment supports various flexible deployment methods such as side-by-side and back-to-back, effectively reducing the area of the power station and lowering the construction investment. 

Regarding the production capacity and mass production plan for the 8-hour energy storage system, Ye Zi gave a detailed introduction on the spot. Haidun Energy Storage has established long-term energy storage integrated zero-carbon production bases in Chongqing and Heze, Shandong Province. The overall planned production capacity exceeds 70 GWh. It is expected to officially deliver products in 2027. 

According to data from third-party institution InfoLink, the global shipment volume of energy storage cells reached 612.39 GWh in 2025, with a year-on-year growth of 94.59%. The shipment volume increased quarter by quarter throughout the year, and the single-quarter shipment volume in the fourth quarter exceeded 200 GWh. The industry's CR10 concentration was 88.8%, which was lower than 90% for two consecutive quarters. This indicates that the industry's popularity has spread from the leading enterprises to the second and third-tier manufacturers, and the overall prosperity of the entire industry has significantly improved. In the list of cell shipments, Haiden Energy Storage ranked second globally, surpassing the second-place company in the previous year, BYD LION Energy. 

Looking at the global long-term energy storage sector, Bloomberg New Energy Finance released a report in March this year stating that 2025 will be a crucial year for the development of long-term energy storage: Global new installations reached an all-time high, the scale of ongoing and planned projects continued to expand, and various countries have also significantly increased policy support. Currently, long-term energy storage is still mainly based on mature technologies such as compressed air and flow batteries for short-term regulation. The report also mentioned that there are differences in the mainstream technology routes in different markets, and compressed air energy storage has become the preferred choice in several major markets. 

The report predicts that 2026 will be a crucial turning point for the large-scale application of long-duration energy storage: global new installations will reach 8.1 GW/35.4 GWh, increasing nearly threefold compared to 2025. As various countries rely on long-duration energy storage to promote deep decarbonization of the power industry, global new installations of long-duration energy storage are expected to exceed 10 GW by 2030. In the mid-2030s, with the continuous maturation of technologies and the increasingly complete supply chain system, long-duration energy storage will witness a larger-scale popularization and implementation. 

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