When Hydro-Québec announced its intention to proceed with the enormous James Bay II hydroelectric project, the 15,000 Cree who live in the region decided to stand up to the giant utility. With unprecedented access to key figures like Cree leader Matthew Coon Come and American environmental activist Robert Kennedy Jr., Power is the compelling, behind-the-scenes story of the Cree's five-year battle to save the Great Whale River and their traditional way of life.