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Blackouts of electric power often result in huge economic losses to power grid enterprises and society. To indicate the losses of accidents, this paper introduces the concept of the accident cost of distribution network failure, analyzes the various factors affecting it and figures out the calculation formula of it. On the basis of fuzzy theory, we use weight of power failure influence to describe the influence cost of blackout under different time and aera conditions together with the ROVTUE, etc. Finally, the paper proposes a new method to estimate the accident cost of distribution network failure and applies it in practical examples.

This paper analyzes different bidding strategies of hydro-thermal suppliers, taking into account the changes of power demand and the unit's limits. In order to gain maximal profit, hydropower suppliers (except for cascade hydropower stations) are equivalent to thermo-power suppliers in this paper. And Nash equilibrium equations are proposed when different bidding parameters are selected to maximize the profits of suppliers. Demand elasticity is also introduced to give descriptions of different power demands. Examples show that all suppliers will adopt high-priced strategy when power demand is high; reversely, when power demand is low, all suppliers will adopt low-priced strategy.

Although China is abundant in renewable resources, the development level of green power is rather low as it contributes less power to the society compared with conventional power. After drawing a comparison of domestic and overseas situations of green power development, this paper discusses the obstacle to green power existed nowadays in China and the impetus to development. Then a new market mode which is based on green power pricing mechanism is also put forward. Theoretically, the new mode is suitable to the national energy situation of China and will promote the sustainable development of power industry. In practice, China has already been focusing on the exploitation of sustainable and renewable energy, and also on power policy making.