Our high electricity prices were supposed to pay, in part, to make the electricity system "more stable".  Apparently that "stability" was just supposed to offset the sudden switch on and switch off of wind turbines and sun powered solar cells, and not the overall stability of the system - like those overloaded hydro vaults?  You will remember the political agenda about crowding more people into Toronto's downtown areas is supposed to efficient in some ways.  (They never mention the word "overload").