A new national strategy will double the capacity of the country's electricity grid by 2050, Prime Minister Mark Carney said as he announced the plan Thursday. The Powering Canada Strong plan will lower the cost of electricity for seven in 10 Canadian households by expanding the role that natural gas plays in the energy mix. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on