Well, the federal complementary regulations are the two electricity regulations that I just referred to, and those are essentially finalized. We plan to publish those in a matter of weeks or, at most, a month or two.
We plan to publish the methane regulations in late winter. Again, those have largely been finalized and are going through an approval process. We have some regulations regulating HFCs from products. I don't have all the details on those, but again, those are fairly well advanced.
The two additional major federal regulations that we're working on are the clean fuel standard—and those are, of course, at a fairly early stage of development where we will be issuing a regulatory framework document, a broad description of the approach, in a matter of days—and the federal backstop carbon pricing system. I suspect you know that has two components: one is a levy, and the other is a regulatory regime for large emitters. We've been working on the development of those regulations, and those regulations will apply to all large emitters in any backstop jurisdiction. We plan to publish a regulatory framework document early in the new year, and we'll be looking for input on those regulations through the course of the winter of 2018.
There's another suite of regulations that are new but that are being updated. Those are all the vehicle and engine regulations. We have work under way on updating the light-duty regulations, paying close attention to what's happening in the United States at the federal level, but also at the state level. That's a really interesting dynamic that we have to pay attention to.
We also have a commitment to introduce heavy-duty vehicle regulations, so tailpipe emission regulations for heavy-duty vehicles. Those are a little farther into the future. The analytical work is under way, but again, we have to pay close attention to what's happening south of the border.