In 2018, the Alberta Energy Regulator approved an application for a 10,000-barrel-a-day tar sands project adjacent to Moose Lake. The Fort McKay nation went to court to challenge the approval and, in May, the Alberta Court of Appeal ruled in their favour. Ben Parfitt is a long-time analyst with the BC Office of the Canadian Centre for Policy Alternatives. He explains the grounds for the decision and its significance for similar court challenges in BC.