You may see TV camera crews in Bracebridge and Gravenhurst today. Ontario Power Generation’s (OPG) Trethewey Falls Generating Station and a barbershop in Gravenhurst are the sites of OPG’s next water safety TV commercial. Filming’s happening at the Falls station on the Muskoka River this morning. The set will move to Gravenhurst’s Type Barber shop and Salon this afternoon. The commercial will be called “The Power of Water,” and will take viewers on a journey that warns about the dangers around dams and hydro stations.