I'm just going to follow up with a little bit more of a technical question. It's for you, Mr. Seymour. It is about the energy performance contracts. You've talked about moving from perhaps a seven-year return on investment to something broader.
I'm just wondering if you could describe for me what goes into determining the payback period. You may have started to answer that in response to one of my colleagues' questions. Could you just talk about that and maybe how you're going to expand or broaden the payback period?