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In electric power system reform environment, grid companies have to estimate the economic performance of power grid construction project completed with a more market-oriented perspective. Therefore, economic efficiency post-appraisal model of the power grid is proposed in this paper. In view of the problem of evaluating of economic benefits only from financial angle in existing research, lack of comprehensiveness and depth, including construction costs, financial, social and economic benefits and environmental impact costs four aspects were build as the index system with network hierarchy. On this basis, the ANP method to solve the index weight was put forward, and hesitate linguistic evaluation method for policymakers, finally cloud model assembled each index evaluation result.In the end, three power grid construction projects in liaoning province had built were used for verifying the feasibility and rationality of the model.

Tibet is located in the southwest of China, with unique geographical conditions and natural resources, new energy reserves like solar energy and wind resources are in the forefront of other provinces in China, and it is also one of the solar energy resource richest regions in the world. Since central Tibet is the economic center of the Tibet autonomous region and Lhasa is the outside sending end of Qinghai-Tibet DC, developing new energy resources in central Tibet would play an important role in inter-provincial delivery of renewable energy power generation, reducing fossil energy consumption to achieve a clean alternative, and stimulating the economic growth of Tibet. In this paper, the renewable energy consumptive situation in central Tibet was studied. Through the analysis of renewable energy reserves, distribution and utilization, the current situation of the renewable energy development, and the electricity load in Tibet, the solutions and suggestions for new energy generation consumption were put forward in the end.

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