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　　How to narrow the gap between domestic and international energy storage technology?

　　It is necessary to reform the market mechanism that is conducive to the development of energy storage, reduce the barriers to grid access for energy storage systems, allow energy storage to participate in power supply services as a power source, and compensate for the peak and frequency modulation services provided by energy storage. At the same time, more flexible electricity price policies can be formulated to encourage full use of the peak-shaving function of energy storage through price arbitrage and other methods.

　　According to the latest updated data from the U.S. Department of Energy's (DOE) global energy storage database, the global cumulative installed capacity of battery energy storage in 2015 was 0.74GW, an increase of more than 25% from 2014.

　　Under the banner of low-carbon and clean development, the global energy field is in a period of rapid technological innovation, with new technological advances constantly emerging. In particular, the development of new energy technologies represented by renewable energy and electric vehicles in recent years will change the future world energy pattern. However, there are also difficulties and obstacles on the way for mankind to move towards a new way of using energy, of which energy storage technology is an extremely critical link.

　　Due to the intermittent and fluctuating characteristics of renewable energy, the grid will not be able to absorb it on a large scale without energy storage, and the promotion of electric vehicles also depends on the battery life and convenience of charging.

　　Internationally, energy storage installed capacity continued to grow rapidly in 2015, with the development of battery energy storage being particularly eye-catching. According to the latest updated data from the U.S. Department of Energy's (DOE) global energy storage database, the global cumulative installed capacity of battery energy storage in 2015 was 0.74GW, an increase of more than 25% from 2014. In addition, projects currently under construction or under contract are expected to be 0.9GW. By country, more than half of the world's installed and planned energy storage devices are located in the United States. The United States leads the world in terms of installed capacity and growth rate of energy storage.

　　In terms of policy, countries are paying increasing attention to energy storage. In early 2016, the United States revised FERC 745, allowing consumer-side power products and services to enter the retail market and treating them the same as traditional power generation devices in terms of compensation. This policy will help increase the return on energy storage investment and promote the development of consumer-side energy storage. In addition, some media reported that the German government is also considering extending the photovoltaic energy storage subsidy policy.

　　Although the energy density of supercapacitors is still not comparable to that of battery energy storage, its charging and discharging speed is extremely fast, charging can be completed in a few seconds, and its cycle times can reach more than 100,000 times. It has the potential to be widely used in power grid frequency regulation in the future. As well as in public transportation such as rail transit and buses. In addition, the orbital energy storage project recently approved by Nevada in the United States is also worthy of attention. This project uses rails to transport heavy objects to high places for energy storage. The principle is similar to pumped hydro storage, which converts electricity into gravitational potential energy. The difference is that the medium for orbital energy storage can be solid. In theory, energy storage can be carried out as long as there is a certain altitude difference.

　　Energy storage technology has also attracted increasing attention from the Chinese government. The National Development and Reform Commission and the National Energy Administration recently issued the "Energy Technology Revolution Innovation Action Plan (2016~2030)" and also released the "Energy Technology Revolution Key Innovation Action Roadmap". The action plan clarifies that future key tasks include advanced energy storage technology innovation, and proposes to master the key core technologies in each link of energy storage technology, complete demonstration and verification, and the overall technology will reach the international leading level, leading the development of international energy storage technology and industry. The "Notice on Actively Promoting the Cooperation Model between Government and Social Capital in the Energy Field" issued by the National Energy Administration in March proposed to encourage and guide social capital to invest in the energy field. Among them, energy storage technology has also been included in the scope of PPP promotion in the energy field.

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