BC Hydro does not have the widespread infrastructure of back up gas or coal power plants that would make Reservoir Hydro more usable in British Columbia. BC Hydro has also been importing and exporting power during Peak and low demand times for decades. It was one of the first Hydro Electric utilities to do this it does  this to  California all the time. The Tragic Truth of Ontario's energy disaster is that their feeble  costly Solutions are in fact increasing greenhouse gas emissions notably.