Optimization of system reliability is a NP hard problem, and people can not find the precise method for result.

系统可靠性优化已被证明是一个NP完全问题，不存在精确的求解方法。

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In the area of renewable and distributed energy resources, which are prone to extreme variability, members can leverage predictive and optimization technologies, increasing the accuracy of their forecasts to balance the supply and demand of electricity and take measures that ensure system reliability.

ENGADGET: IBM announces Smarter Energy Research Institute, aims to improve energy grids (video)