The 26-day hearing by the Joint Review Panel was the most rigorous review Hydro has ever faced. It says the dam would be a source of clean, renewable and cost effective electricity for more than 100 years.
It also claims it would provide 1,100 megawatts of capacity and annually produce enough electricity to power the equivalent of about 450,000 homes.
An updated cost projection released about three years ago pushed up the estimated price tag to $7.9 billion, $1.3 billion higher than the one in a 2007 feasibility study.
The project has run into stiff opposition lead by Environmentalists, First Nations, and flood impact landowners.
Even the province of Alberta has voiced concerns that go to increased mercury levels in fish and the escalation of the risk of floods or drought along the Peace in that province.