a healthy chunk of it for sure! But not exclusively ON. Expect you'd see if big wodge of Alberta in there too (also coal phase-out). I'll break it out!
Here are GHGs from electricity generation* broken out by Province. Nearly equal contributions from Ontario and Alberta (latter ahead by less than 1 Mt), and an assist (massive in relative terms!) from the Maritimes.
You're very welcome to it! The stripes are to indicate a sub-sector. If you put the striped blue Oilsands and Rest of O&G together you get the regular blue Net O&G
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* IPCC definition, data from Annex 13