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A power conduit distributes power between power generators and appliances up to six squares away. If your power grid contains batteries with stored charge, it is possible for a power conduit to short circuit, automatically destroying the conduit and discharging the entire stored power of the grid in an explosion proportional to the amount of charge; this is a random event which cannot be prevented if you wish to use batteries, though the damage can be mitigated by building walls over your power conduits. You can also reduce the size of the explosion and lost power by keeping some of your batteries isolated from the grid using power switches. Due to a quirk of how the faulty conduit is selected, the more charged batteries that you have disconnected from any conduits, the less likely a short-circuit is to occur and the longer you will have between such events.