About $8B of proposed wind and solar projects may be at risk under the new province edict, but 500-MW Buffalo Plains onshore wind generator is set to operate by year-end.

Uncertain economic returns and duration of federal tax credits could delay or cancel project proposed by six oil firm majors, set to be the world’s largest, says energy sector research firm Wood Mackenzie.

But critics say problem is worse in Canada energy production hub than regulator outlines.

Alberta's 400-MW solar farm, just approved, will be competitive even with halt of 2015 clean-energy mandate, proponents say.