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SlightlyVisible I appreciate the effort. I've previously tried to use exactly the same reasoning, but Thermal Expansion has warped most players expectations of MJ power to such a degree that it's a lost cause. Just let it rest.
BuildCraft might actually get its own way of storing a limited amount of energy. At a minimum some sort of buffer that can smooth out spikes in power usage or production. There are currently no exact plans to add this, but it has been discussed. cpw apparently had a good idea he wanted to implement, but time has not allowed him to work on it.