I have friends who live in one of those. The house itself wasn’t that expensive, but then they used a lot of recycled materials and volunteer labour. It does have the virtue of being very thermally efficient, which means that their heationg costs are very low.
What can be expsnsive is the solar/wind/micro-hydro electric system. Some people assume that they can just plug in a solar/wind/micro-hydro system in place of their utility feed and otherwise do nothing, for about the same cost. This results in up-front costs often greater than $50,000 for the system.
They quickly discover how much saving can be realized through greater efficiency, which means less cash outlay at the beginning.
Here’s an example. I was in the hardware store looking at LED lightbulbs. They were around $40 to give the same light output as an incandescent bulb that cost 50c.
Let’s say that was a 100-watt incandescent: it uses 100 watts of electricity. But the LED bulb uses 10 W, If you’re getting power from the grid at 20c/kWh, lighting the incandescent for an hoiur costs 2c, while lighting the LED for an hour costs 0.2c. Not a big difference in you’re in the city? Maybe. But consider…
A 150-W solar panel with a battery and associated equipment might cost $750. That panel will run just one of the 100-watt incandescent bulbs. But it will run 15 of 10-watt the LED bulbs, for 15 times the light.
Sure, you pay up front, but then the cost drops, and you’re bnot subjected to blackouts beyond your control. And in a situation where it might cost $50,000 to run a pole line to your rural property, and then you’d still have bills, generating your own looks a lot more attractive.
And don’t think utilities don’t go through the same calculations. It’s just as beneficial for them to encourage people to become more efficient. A thousand families each replacing 10 100-watt incandescents with $40 LED bulbs that use a tenth of the power will reduce their load from 1 megawatt to 100 kilowatts, at a cost of $400 per family. Reductions like these across a city or a province mean less outlay on new power plants.