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As a measure of demand-side management, efficiency power plant (EPP) can save energy and bring economic and environmental benefits to the power system, although the widely used EPP technology may have negative effect on both power system stability and operation costs. The concept of EPP and its related characteristics such as capacity, output curve, and cost were introduced, and a probabilistic production simulation model based on the equivalent energy function (EEF) method was established to analysis the impact and benefits of EPP. With a numerical example, a result is found that EPP can not only improve the reliability and load rate of power system, thus reducing the social costs of power outage, but also reduce the total production and operating costs of power system.

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