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实施分时电价的重要目的之一是鼓励用户调整其用电模式，即做出负荷响应。由此希望诱导出更为合理的系统总负荷曲线，即使得电力生产中的总发电成本、煤耗及排放量更小。在实施分时电价前对这种潜在效益做出某种估计，找到最满意的总负荷曲线，对于制定合理的电价至关重要。为此，对负荷响应导致的发电成本降低效益提出了一种估计方法。该方法基于求解一种特殊形式的安全约束机组组合问题而实现，同时也得到了使总发电成本最低的最优系统总负荷曲线。有关数值试验结果验证了方法的有效性。由于电价曲线与负荷曲线之间的密切联系，所以该方法可以为制定合理的电力定价策略提供参考。“,”One of the most important aims of time-of-use electricity pricing is to encourage the customers to adjust their load profiles. As a result, the aggregate system load profile of a grid may be more preferable, i.e., the corresponding generating costs, fuel consumption and emission in electricity generation will be reduced. Estimating the potential benefits before the implementation of time-of-use pricing and finding the most satisfactory system load profile are very important in determining the suitable level of electricity prices. In this paper, the potential benefits resulted from demand response were estimated by solving a special kind of security constrained unit commitment (SCUC) problem and the optimal system load profile was also obtained. Numerical testing was performed for two example systems and the results were also analyzed. The proposed method may provide reference for finding suitable pricing strategies.