On Friday, November 8, 2024, the Supreme Court of Canada (the “SCC”) released two unanimous decisions, Auer v. Auer, 2024 SCC 36 (“Auer”) and TransAlta Generation Partnership v. Alberta, 2024 SCC 37 (“TransAlta”) clarifying the standard of review for judicial review of subordinate legislation, including ministerial regulations. The below article explores how these cases may affect Municipal and Planning Law matters in Ontario.