Introduction: This article first introduced the development status and supporting policies of distributed energy in the United States, Denmark, the United Kingdom, and Japan. It also analyzed the development status, policies, and standards of China's distributed energy industry, and finally conducted a review of the development of China's distributed energy industry. to sum up. Distributed energy is a new form of energy supply system. It is a distributed energy supply system that generates energy, heat, and cold energy by consuming primary energy and natural gas based on the concept of integrated energy cascade utilization. The national “Thirteenth Five-Year Plan†outline will push the development of distributed energy projects to a new height. With the steady improvement of the national economy and the continuous improvement of environmental protection requirements, the demand for clean energy will continue to increase, and investment in distributed energy projects will continue to increase. This article studies the distributed energy policy and development status of the United States, Denmark, the United Kingdom, and Japan, and analyzes the current status of distributed energy development in China to provide reference for the next step in the development of the industry. According to statistics published by the International Energy Agency (IEA) in 2015, “Power Development Trendsâ€, the total installed power generation capacity of OECD countries in 2013 was 2,794 GW, of which gas generators accounted for 21.7%. The developed countries such as the United States, Denmark, the United Kingdom, and Japan rank among the top in the world in terms of policy support for distributed energy projects, the number of operational projects, and the level of industry technology. 2.1 United States 2.1.1 Development Status The United States is one of the countries that developed distributed energy earlier in the world. Since 1978, it has advocated the development of small-scale distributed gas-fired cogeneration technologies. According to statistics, in 2000, there were 980 distributed energy projects for commercial and public buildings in the United States, with an installed capacity of approximately 4.9 GW; an industrial distributed energy project of 1,016, and an installed capacity of approximately 45.5 GW. After the “California Blackout†accident, the U.S. government will promote the development of a distributed cogeneration system as a long-term development plan to improve the safety of energy supply and set clear strategic objectives: Strive to build new office buildings or commercial buildings by 2020 The proportion of applications of distributed energy technologies will be increased to 50%, and the energy supply system for 15% of existing buildings will be converted to a distributed energy model. The installed capacity of distributed energy projects will be 187GW, accounting for 29% of the country's total installed capacity. %. At present, the U.S. Department of Energy believes that the potential for the development of distributed energy in the United States is 110 to 150 GW, of which, the distributed energy potential in the industrial sector is 70 to 90 GW, and the distributed energy potential in the commercial and civilian sectors is 40 to 60 GW. 2.1.2 Supporting Policies The U.S. government’s distributed energy policy is mainly reflected in the reduction of certain investment taxes, the shortened asset depreciation period, the simplification of business licensing procedures, and the incorporation of projects to mobilize project investment enthusiasm. These supporting policies have improved the economics of the project and encouraged and promoted the development of distributed energy projects. 2.2 Denmark 2.2.1 Development Status Denmark is one of the countries with the highest energy efficiency in the world. More than 80% of district heating sources adopt cogeneration methods, which reflects the use of limited resources in the most effective way, resulting in economic advantages and environmental advantages, which have not caused excessive energy consumption while increasing GDP. And environmental pollution. In the Danish distributed energy system, its energy is mainly contributed by wind power and coal-fired power generation, and the proportion of natural gas is not high. Since 1990, Denmark’s newly added electricity has mainly relied on distributed energy systems, especially for industrial users and small-scale regionalized distributed energy power stations (thermal power stations) and renewable energy projects. In the future, one of the development directions of Denmark's distributed energy sources is the conversion of regional thermal power plants to natural gas, waste, and biomass. 2.2.2 Supporting Policies Compared with traditional coal-fired power plants, distributed energy systems can save 28% of fuel, reduce CO2 emissions by 47%, and have high energy efficiency. Therefore, Denmark is the country with the most distributed energy policies in the world and it requires strict implementation. Among them, energy tax rebates and low-interest loans policies provide strong support for project investment. 2.3 United Kingdom 2.3.1 Development Status According to the “Energy Statistics Report†released by the Department of Energy and Climate Change (DECC) of the UK government agency in 2008, the total installed capacity of gas generating units in the UK reached 5.47 GW, which accounted for 7% of the total electricity generated in the country. In 2012, the UK’s total installed power generation capacity was 89.2 GW, of which, gas generators accounted for 28% of the total installed capacity. With the promotion of distributed energy systems in the United Kingdom, over the past 20 years, more than 1,000 projects have been installed in commercial facilities, hospitals, schools, airports, office buildings and other public places, including offices of British government agencies. Therefore, the efficiency of energy utilization is improved. The British government also requires that power generation project developers consider the feasibility of distributed energy technologies when reporting projects. The “British Energy Production Outlook†issued by the British Department of Business and Industry Strategy (BEIS) in 2016 shows that natural gas power generation accounts for 45% of total power generation. The UK will cancel all coal-fired power plants by 2025. 2.3.2 Supporting Policies The United Kingdom has implemented a climate change tax since April 10, 2001. The initial tax rate will increase the electricity tariff by 0.43 pence/(kW ̇h) and the coal and gas costs by 0.15 p/kWh. The distributed energy project does not need to pay the climate change tax, and it is expected to save 20% of energy costs. The provision of a distributed energy project, represented by cogeneration, allows direct sales of a certain amount of electricity. 2.4 Japan 2.4.1 Development Status Due to restrictions on resources and location, Japan uses energy sources such as distributed energy, solar power, and wind power to reduce its dependence on energy imports. In particular, after the closure of the Fukushima nuclear power plant, construction of a distributed energy project began to accelerate. As of the end of 2010, Japan's commercial and industrial applications of distributed energy projects had an installed capacity of 9.44 GW, of which 6,319 were commercial projects, mainly used for hospitals, restaurants, public recreation facilities, etc., and 7473 industrial projects. Used in chemical, manufacturing, power, steel and other industries. 2.4.2 Supporting Policies The price of fuel and electricity sold relates to the economics of distributed energy projects. The Japanese government guarantees the return on investment of distributed energy projects through special taxes, low-interest loans, investment subsidies, subsidies for new technology development, etc., and vigorously promotes distributed energy projects to improve energy efficiency. 3.1 Development Status In 2011, the National Development and Reform Commission issued the “Guidelines for the Development of Distributed Energy in Natural Gas†[2011] No. 2196 [2011]. The main task is: 'During the period of construction of about 1,000 natural gas distributed energy projects and 10 or so distributed energy demonstration areas of various typical characteristics, the proposed goal is: 'The installed capacity of distributed energy projects during the 13th Five-Year Plan period will reach 50GW, accounting for Nearly 3% of the total installed capacity of electric power, and 50% of the installed capacity of natural gas power generation, initially realize the industrialization of distributed energy equipment." As of the end of 2014, the China City Gas Association's Distributed Energy Professional Committee (hereinafter referred to as CDEC) had 104 distributed energy projects under construction and under construction in China, with an installed capacity of 3.8 GW, accounting for 0.28 of the country’s total installed power generation capacity. %, including building type 0.15GW and regional type 3.65GW. By the end of 2015, China's natural gas distributed energy projects have grown to 205, with a total installed power capacity of more than 7.5 GW, of which 105 have been built, 35 are under construction, and 65 are planned for construction. Compared with the main task indicators proposed in the document of China Development and Reform Energy [2011] No. 2196, the completion rate only reached 20.5%. China's distributed energy projects are mainly distributed in the Bohai Rim, the Yangtze River Delta, the Pearl River Delta, and Sichuan and Chongqing. The installed capacity accounts for about 70%. The details of China's natural gas distributed energy projects released by CDEC in 2015 are shown in Table 1. In Table 1, the ratio is the ratio of the number of natural gas distributed energy projects in the target area to the total number of domestic natural gas distributed energy projects. The installed capacity accounts for the installed capacity of natural gas distributed energy projects in the target regions and the domestic natural gas distributed energy projects. The ratio of total installed capacity. As can be seen from Table 1, the overall development of distributed energy projects in China is as follows: the largest number of coastal cities, followed by Sichuan and Chongqing. 3.2 supporting policies and standards The development process of China's distributed energy industry is similar to that of foreign countries. Policies from macroscopic incentives to substantive support will play an important role in promoting the healthy development of the distributed energy industry. After 2011, China's distributed energy industry policy was intensively released, and support has gradually become substantial. In order to further complete the preparatory work for the distributed energy project, the current major policies and standards in China are sorted out. The project investment and construction units should fully study these documents. China's distributed energy-related policies and standards are shown in Table 2. “-†in Table 2 indicates no document number. The distributed energy related documents such as laws and regulations, technical standards, and taxation subsidies policies formulated by developed countries cover all aspects of the development, planning, technology research and development, investment construction, and operation and maintenance of the distributed energy industry chain, with initial investment subsidies or benefits. Fuel tax immunity, power access priority, grid incentives, electricity price formation, income distribution mechanisms and other aspects involving the distribution of benefits are mandatory and support industry development. The development of China's distributed energy industry is still at an early stage. It is influenced by policies, lacks overall development plans, financial subsidies and other policies are insufficient, and the implementation and support of national policies in different regions are quite different, seriously affecting the development of distributed energy projects. Enthusiasm and economy. In developed countries and regions such as the United States, due to the availability of resource guarantee capabilities and stability and equipment maturity for distributed energy systems, distributed energy has developed in an all-round manner and has grown rapidly, becoming an important development direction for the energy industry in the country or region. And support. China's distributed energy projects are too concentrated in the economically developed regions of North China, East China, and South China. The development of each region is unbalanced. 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