I've always worried about fire too. I don't have to worry about over loaded circuits though, thank goodness. I have a fairly new breaker box because of the solar panels on the roof, and each tortoise house and green house are on their own circuit! Another of my worries is big branches falling in the wind. I've had most of the close-by trees cut down for that reason. Now I only have a very large pepper tree left that a bit of a danger. Its right behind my barn. I'm having it cut down a bit at a time. Its very costly to do the whole tree at once.