It's an excellent question.
In theory, going at some of the existing facilities could conceivably be cheaper, because we have some hydrogen production areas where we have relatively pure CO2, and you may have heard that capturing CO2 from hydrogen plants already there is easy to do. Well, it's easy to do, but it's not easy to send a bunch of welders into a 30-year-old plant you're trying to keep operating. So the costs of retrofitting, in fact, in our estimation, are dramatically higher than the costs of doing it in a new facility.
A large part of the ongoing operating costs of CO2 capture and storage involve energy use. We have to apply a calculation that says if we reduce 100 tonnes of CO2, we can only really count for, let's say, 85 tonnes of reduction, because we have to buy some more electricity from TransAlta or EPCOR, and that puts CO2 in the air. So it's a very energy-intensive process.
If you design it into a new facility that's being built, whether an oil sands upgrader or a coal gasification plant or a refinery, then you have an opportunity to do a much better job on energy efficiency and an opportunity to use a better scale of technology that's less expensive.