Based on the background of profound adjustment and changes in the international energy pattern, the complex challenges and strategic transformation opportunities faced by China's energy development, this monograph puts forward the concept of big energy, and analyzes and studies energy problems with the method of system theory, the concept of sustainable development and the perspective of overall situation, wholeness, history, openness and universal connection. Considering and planning the development of power grid in the overall situation of national energy development and even the overall situation of national modernization has triggered our in-depth thinking and re-examination of the value of power grid enterprises. The book is rich in content, thorough in analysis and insightful, which embodies the wisdom and hard work of generations of energy workers represented by the author, and embodies the author's broad vision, forward-looking thinking, accurate grasp of energy laws and strong sense of responsibility and mission for the development of energy industry. The development and utilization of energy has promoted the progress of human society and the development of the world economy. The energy problem has become the core and focus of universal concern in the world, and economic and social development is increasingly dependent on energy. Without energy, all modern civilizations will disappear. The sustainable supply of global fossil energy, especially petroleum resources, is increasingly restricting the economic and social development. The constraints brought by climate change have a great impact on global energy development, and resources and environment are increasingly restricting energy development. Under the background of economic globalization, with the sustained development of China's economy and society, the demand for energy is increasing, the international energy situation and climate change are becoming increasingly complex, and the constraints and contradictions faced by China's energy development are becoming increasingly prominent. Power grid enterprises are playing an increasingly important role in optimizing energy structure and developing low-carbon economy, which has immeasurable environmental value. Developing and utilizing clean energy and promoting the development of low-carbon economy is the development trend in the world today, and it is also the common choice of all countries in the world. Clean energy sources such as hydropower, wind energy, solar energy and nuclear energy need to be converted into electric energy, so as to realize large-scale development, long-distance transmission and efficient utilization. However, due to the inherent characteristics of clean energy power generation, such as seasonality, intermittence, instability and anti-regulation, the pace of its development and utilization has been seriously restricted, and the large-scale utilization of clean energy has become a worldwide problem. As a strategic fulcrum to promote the green development of energy, a strong smart grid has great environmental value. By building a long-distance, large-capacity and low-loss UHV power grid, we can break through the technical limitation of regional power balance, realize the unified balance and organizational consumption of clean energy in a wider range, effectively reduce the impact of voltage fluctuation, flicker and harmonics on the safety of local power grid, and improve the ability of grid access and consumption of clean energy. By promoting the intelligent development of power grid and improving the level of informatization, automation and interaction of power grid, the self-healing function of power grid can be significantly enhanced, the large-scale and efficient application of clean energy can be promoted, the green energy consumption mode can be constructed, and the development of emerging strategic industries such as electric vehicles can be promoted. Power grid enterprises are becoming more and more powerful in improving energy efficiency and realizing large-scale energy resource allocation, creating great economic value. The long-term emphasis on local balance and local self-seeking balance in power development is an important source of excessive dependence on coal transportation in China's energy resources allocation. The repeated shortage of coal and electricity transportation shows that this development mode is unsustainable. China's energy resources and energy demand are inversely distributed, which determines that energy allocation must take the road of large-scale, long-distance transportation and large-scale optimization. Giving full play to the comparative advantages of various modes of transportation and building an integrated modern energy comprehensive transportation system with division of labor and cooperation, complementary advantages and continuous connection is the only way to eliminate the bottleneck of energy transportation in China and improve the efficiency of energy allocation. The power grid has few transmission links, high efficiency, wide coverage and obvious unique advantages. It has become an important part of modern comprehensive energy transportation system, and the contribution and value of power grid enterprises in ensuring energy security are increasing day by day. State Grid Corporation of China takes solving China's energy dilemma as its own responsibility, promotes energy development with electricity as the center, vigorously implements the four strategies of "one expert", accelerates the construction of a strong smart grid, significantly enhances the large-scale and long-distance transmission capacity of the grid, and provides a fast and efficient air passage for energy transmission in China. The key to implementing the strategy of "one expert and four majors" is to build a UHV power grid and a strong smart grid connecting large power supply bases and major load centers, providing a strong power grid platform for the intensive development of energy bases and the optimal allocation of energy resources throughout the country, which not only solves the problem of large-scale allocation of energy resources in China, but also helps to alleviate the pressure of railway transportation and reduce the cost increase caused by long-distance coal transportation, and has important economic value. Since the Eleventh Five-Year Plan, State Grid Corporation of China has vigorously promoted the transformation of power grid development mode and promoted the transformation of national energy strategy by building a strong smart grid. With the construction of three sets and five systems, the company vigorously promoted the transformation of the company's development mode and realized the leap-forward promotion of comprehensive value. However, influenced by the public's prejudice against power grid enterprises in the period of power shortage in history and the fact that central enterprises have long attached importance to information output, neglected the dissemination of ideas, emphasized the expression of facts and neglected the embodiment of values, power grid enterprises have not yet formed corresponding social appeal and influence while providing increasingly powerful service capabilities and higher service levels for the country's economic and social development. At a time when more and more factors that disturb and restrict the development of enterprises are not from enterprises themselves, and more and more development problems need to be solved together with society and stakeholders, the publication of Social Responsibility of Power Grid Enterprises shows the willingness, behavior and performance of power grid enterprises to actively fulfill their social responsibilities, realizes the expression of enterprise values and the spread of ideas, and will certainly play an important role in promoting the social, economic and environmental values of power grid enterprises to be recognized by the society.