In terms of the technologies, first off, as I mentioned in my slides, is the recommissioning of buildings. I dare say that most buildings are not performing optimally, and recommissioning will let them do so.
I'm sure David could speak to a large number of measures that can be retrofitted to buildings to bring down their energy performance. I guess the reason for the emphasis on the energy target is that it gives you an endpoint that you want to get to.
David, maybe you would like to speak to some of the technologies.