That's a very reasonable timeframe to expect recovery on investment.
This is probably a question for the retailers. I know a lot of the retailer natural gas companies offer what your business would refer to as something like a futures contract. They'll say, “We'll only charge you x cents per unit of energy for the next three years if you buy in at this rate, as opposed to paying the fluctuating cost.”
Do you think it's possible for those kinds of contracts to be made very long term for the consumer, so they would have predictability about the cost of investing in a unit to fill up at home?