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In the power market environment, it is important to establish the appropriate price of electrical energy. It should reflect the generate electricity and other operation cost. As one of the price for end user, time-of-use (TOU) tariff is used by most country of the world. As one of the most efficient measures for modern demand side Management (DSM), time-of-use (TOU) tariff is very beneficial to flat the load curve, which depend on not only the peak and valley price appropriate, but also the peak and valley time periods partitioned appropriately. A peak and valley time period's partition method in this paper based on annual continuous load curve is proposed, simultaneously combined with statistical probability distribution. Example shows the objectivity and scientificity of this partition method as well as the operability.

In China and other developing countries, the electricity retail pricing structure is still based on customer classification, and capacity cost allocation is a long-term and important issue. To allocate capacity cost for various customers is relation to their time-varying load characteristics. For this, the paper in-depth analyses the relationship between the power system generation capacity responsibility and the time-varying characteristics of power load demand, applying the economic ideas and methods of the peak-load problem; presents a capacity cost responsibility model, by which the power generation capacity cost is allocated for system load in all time; and then established the classified customer cost-sharing model of power generation capacity with peak-load pricing theory, which takes into account the users load characteristics and overcomes the shortcoming of the existing methods that generation capacity responsibility is only dependence on the power load value at a given moment. Cases verify the rationality and fairness of the cost-sharing model.