 Together, Niagara's generating stations can produce about 4.4 gigawatts of power.In August 2005 Ontario Power Generation, which is responsible for the Sir Adam Beck stations, started a major civil engineering project, called the Niagara Tunnel Project, to increase power production by building a new diameter, water diversion tunnel.It was officially placed into service in March 2013, helping to increase the generating complex's nameplate capacity by 150 megawatts.