I need to try the switching the water heater off! My electricity bills can get pretty high, but that's because I live in a big trailer and there isn't too much insulation, so in the winter heat is necessary and in the hot, sweltering Louisiana summer air conditioning is a must. Plus we get all sorts of *lovely* surcharges for hurricanes that happened years ago as well as more recent ones... Paying last month's bill right now and it is $112, it's not too bad because the weather has been good enough that I don't have to use much heat or air. Two people, four tanks (added another one this past week though). I've never really noticed bills going up when I've added a tank.
I hope you can convince him to let you have your pond! I wanted one when I was your age, well, actually even younger. I think I started asking my mom if we could build a pond when I was maybe 12 or 13. Never got it, but she has been thinking about putting one in lately. Her reasoning against it was always all the work, and that within a few years I would be moved out and she would be left to deal with it. That and her fears I would get bored with it before we got it finished. When I have my own house (I'm renting now) I will probably build one if I have enough yard space.