Canadian Energy Systems Analysis Research (CESAR) uses official data from Statistics Canada, the National Energy Board, Natural Resources Canada and Environment Canada to create Sankey diagrams illustrating the flows of energy at the provincial and national levels. The current version for Nova Scotia (for 2013) is shown above. An interactive version can be found here.
The CESAR site offers many options for Sankey diagrams and other visualizations of Canadian and provincial energy systems. For background information and for helpful insights see this article accompanying the latest update: You can’t manage what you can’t see!