Back-up power to Crosstown LRT to come from battery

The government has devised a plan to store excess energy for the  Crosstown LRT in a battery-like storage facility. The power would be available to drive the system in the event of an outage. The scheme replaces a  gas-fueled generation plant which had been planned. The inspiration for this came because residents of the Mt. Dennis area objected to the gas plant which would have been located there. The power storage system wold have the capacity to drive the LRT for four hours. The linked story from Urban Toronto notes that most outages are much less than four hours. There is no mention of what might be done if there is a long-term blackout such as those which have spotted the history of Toronto over the decades.  Urban Toronto