Energy efficiency is the first obvious step for all of these things. We're seeing that the energy efficiency measures are the first components as we push toward greater levels of performance. You can get those at the individual building or house-type level. Once you go beyond that, though, it gets into the district level of things, and that's very much what we're looking at here.
It really comes down to smart planning. Much of what's come out from the savings we see when we're looking at how to do integrated communities is the same type of thing that came out from the building science, if you will, on how to do better buildings: do your planning upfront. Make your smart decisions. It's not about specific technologies, per se. It's about taking a look at your situation, your uses, and your applications, and using the right technologies and the right mix to get the savings and hit the targets you're looking for.
In terms of the different technologies that you go with, beyond the basics, certainly, we're seeing the opportunity to use renewables combined with storage systems, as a big piece, and to use district systems that enable you to use any heat source, be it waste heat, be it bio, or be it renewables. There are all kinds of different ways. And then you also have the capacity to switch back and forth between them, depending on what makes the most sense. The planning aspects also enable the transportation elements to come into it.