Ending the use of coal-fired electricity was a massive climate achievement — the equivalent of taking seven million cars off the road. The Ontario Clean Air Alliance led the 17 year campaign to end coal use in Ontario. Despite winning an early consensus that coal had to go for health and environmental reasons, it took many years of savvy campaigning to see coal fully eliminated. This report looks back at how this remarkable success was achieved by a small organization and the lessons learned from one of the biggest environmental success stories in recent times.