I don't have all of the details, but quite simply, the more carbon intensive the electricity system is in a province, the greater the potential impact will be with these clean electricity regulations.
I'm from Quebec, where this is not an issue because we are lucky enough to have massive hydroelectric resources. The same is the case, for example, in British Columbia. If you happen to be in a jurisdiction that doesn't have a resource endowment, for example, in Alberta, Saskatchewan and Nova Scotia.... Even here in Ontario, the system operator has expressed concerns about the clean electricity regulations and the impact they might have here. That is with the not insignificant hydro resources in Ontario and a very robust non-emitting nuclear sector as well.