The policy support for solar battery storage systems mainly includes subsidy policies, planning guidance, improvement of market mechanisms, and encouragement of demonstration projects, as follows:

1. Subsidy policy: Many local governments have introduced subsidy policies to support the development of solar battery storage systems. For example, during the peak summer (winter) season in Jiangshan, Zhejiang, a subsidy of 0.5 yuan/kWh is provided to energy storage users and electric vehicle users who effectively transmit electricity to the grid; Projects that meet policy requirements in Shanghai can receive rewards for three consecutive years according to the first year's application standards, with independent energy storage at 0.35 yuan/kWh and user side at 0.2 yuan/kWh, with a reward period of three years; For energy storage demonstration projects that have been recognized, verified, and completed acceptance in Dongguan, Guangdong, post investment subsidies of no more than 0.3 yuan/kWh will be provided to the investment subject based on the actual discharge amount approved from the second month of operation. The cumulative subsidy shall not exceed 2 years, and the cumulative subsidy for a single project shall not exceed 3 million yuan.

2. Planning guidance: Local governments formulate energy storage development plans, clarify energy storage installation targets and industrial development directions. As proposed by Hefei, Anhui, by 2025, the revenue of the new energy storage industry should not be less than 30 billion yuan, and the cumulative installed capacity of new energy storage should not be less than 80000 kilowatts; Jilin has specified that by 2027, the scale of new energy storage should not be less than 1 million kilowatts, and by 2030, the scale of new energy storage should not be less than 3 million kilowatts; Shandong requires the construction of 3 million kilowatts of new energy storage by 2025.

3. Market mechanism improvement: Policies promote the participation of energy storage in electricity market transactions and improve pricing mechanisms. Jiangxi Province proposes to establish a complete market system of "medium and long-term electricity+spot+auxiliary services", supporting independent energy storage to participate in the spot market and the medium and long-term electricity market; Tianjin supports industrial power users, large commercial complexes and other power user groups to actively participate in the construction of virtual power plants, and promotes the participation of virtual power plant operators in demand response, auxiliary services and other power market transactions; The National Development and Reform Commission and other departments have issued guidance on vigorously implementing the action of replacing renewable energy, proposing to establish and improve the energy storage pricing mechanism, and exempt the demand (capacity) electricity fee for centralized charging and swapping facilities that implement a two-part electricity pricing system within the prescribed period.

4. Encouragement of Demonstration Projects: The state encourages the construction of new energy storage demonstration projects to provide support for technology promotion. The General Office of the National Development and Reform Commission has issued a notice on organizing the application for the second batch of green and low-carbon advanced technology demonstration projects, including new energy storage demonstration projects, integrated grid load storage and multi energy complementary demonstration projects, all of which are related to photovoltaic energy storage systems, and will focus on supporting projects included in the national new energy storage pilot demonstration.

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