Discussion on the new model of "water diversion+" for the integration of water diversion projects in construction with pumped storage power stations
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Abstract:
The water diversion project combined with the construction of pumped storage power stations can achieve multiple functions such as water diversion, energy storage and power generation, and new energy consumption. It is a new model of "water diversion+" exploring the integration of water and energy. Most domestic scholars and experts have proposed innovative models for the integration of the two in terms of concepts, ideas, and route plans, however, a feasible business model is the important foundation for achieving the integrated development of different industries. Therefore, the feasibility of this model is further studied from the perspective of the engineering investment economy. Considering the low return on investment of water diversion projects and the fact that water prices are generally difficult to cover construction and operation costs at the current development stage, the "water diversion+" business model is proposed, aiming to achieve overall balance through multiple project functions and comprehensive benefits and solve the problem of difficult market-oriented operation under the current water price conditions of a single water diversion project.In order to scientifically calculate the economic benefits generated by the new mode of "water diversion+", the method of comparing the cost of single side water division was adopted. Two engineering cases are used, namely, the combination of water division projects with pure pumped storage power stations and non-circulating pumped storage power stations, to calculate the cost of single side water division under the "water diversion+" model from the aspects of annual operating costs, depreciation costs, and interest expenses, comparing the cost of water diversion projects without the use of the "water diversion+" model to obtain comprehensive benefits and propose the main conditions that should be focused on for water energy integration based on their respective characteristics. The calculation results show that after adopting the "water diversion+" model in two different engineering cases, compared to the construction of separate water diversion projects and pumped storage power stations, the comprehensive investment and operating costs of the "water division+" project have been reduced. On the basis of not reducing the self-benefits of the pumped storage power station, the cost of sharing the single water division function has been reduced by 0.32 yuan/m3 and 0.16 yuan/m3, respectively, compared to the construction of separate water diversion projects, The overall balance of comprehensive benefits has been achieved.According to the research results, the water diversion project and pumped storage power station are implemented in a coordinated manner. The project has two major functions: water diversion and energy storage. Under the premise of reasonable control of scale, the overall investment of the project is shared by the service functions of water supply and energy storage. The cost of evenly spreading to a single cubic meter of water volume under certain conditions will be lower than the cost of constructing a separate water diversion project. In fact, it is equivalent to constructing a water diversion project of the same scale at a lower cost, reducing project investment and operating costs, and significantly enhancing the financial capabilities of the project. There are certain conditions for using the "water diversion+" model, and comprehensive consideration should be given to factors such as the construction needs, project scale, development timing, project scheduling, and operating costs of regional pumping and water diversion projects. At the same time, research results can provide new ideas for fully leveraging the economic benefits of the "water diversion+" model.
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