The best example to look at is what Paris is doing. Vancouver being on a tectonically active area, we definitely want to make sure that we are using geoscientists and that we are not overly stressing and causing seismic events, but with wells for heat you need only about 30°C. You can look at the slide I have up here. For power, you need to make steam, which then would turn a turbine, but for heat you're looking at just 30°C. That's about a kilometre deep, and when you're a kilometre deep you're not really into that seismically active zone.
What communities in Paris do is literally go to a street corner, or maybe a park, and set up a drilling rig. They have perfected how to drill within a tight area. You would drill down, and you would have infrastructure pipes going into the homes. It's better in apartment buildings. You don't really want to get into lots of pipes. Pipes will sink your economics. To your comment earlier, what you want to do is make it denser. In an urban environment, you really want to go after apartment buildings or large buildings, as opposed to individual homes. If you're going to do it more for individual homes, you really want to have an individual home and then another user, like a greenhouse or a fish farm. You need to do it more on a district heating basis.
We would suggest that new builds are far easier than retrofitting, because if it has already been piped one way, it's going to be very costly to install pipes. We definitely want to walk before we run, but with the explosion in growth in Toronto and Vancouver, there are lots of new builds to target.