We heat all our water with solar. The house also used to be all solar electric, but the people who owned the house before us disconnected it???? Someday we plan to reconnect that as well. Although alternative energy is an upfront investment, it usually pays itself off in a number of years, usually around 10 but it depends on a lot of factors. My dad installs solar panels as a side job, and we had them on our house in Ohio growing up so I have been "solar" my whole life. Our gas bills in the summer are near zero.
Also, you get tax deductions of approximately 30% (off the top of my head) for any alternative energy costs - installation, upkeep etc., up to a certain amount (~$2000 for solar I think) so when you take this into account you can really save a lot of money. Like I said, it is an upfront investment but over the long run it saves you a lot of money, and frankly peace of mind. I like knowing that if there is a gas shortage or (when we get around to hooking up the electric) and electric outage that we are still functioning. The way our world is going, who knows if/when we will run out of all these things we take for granted? Also, like your wife says, it "greens" things up and that can never be a bad thing.
My dad wanted to start a company that would finance people for installing alternative energy, because a lot of people want to do it, but don't have the money up front - I think this would be a great thing to do, if you had the capital.