Since the case went to court, an estimated 1,800 wells representing more than $100 million in liabilities have been abandoned.
2016 decision ruled assets from bankrupt energy companies should go first to creditors, not to cleaning up abandoned oil wells.
Forecast calls for 4,175 wells to be drilled in Canada next year, up about 6% over 2016.
AER rules are meant to prevent financially shaky companies from running up reclamation liabilities to unaffordable levels.
Opportunity missed for jobs and to clean up environmental mess: Greg Clark.
Provincial auditor says up to 700 wells could be orphaned in the prairie province.