180 Toronto buildings have ditched energy-intensive air-conditioning in favor of cooling by pumping frigid waters from the depths of Lake Ontario through pipes in the walls and floors.
These include City Hall, Toronto General Hospital, hotels, data centers, and the Scotiabank Arena, home to the Raptors basketball franchise—altogether the 54 million square feet of real estate save 90,000 megawatt hours of electricity annually, which is enough to power 25,000 homes…