Autonotion
Summary
Every air conditioner you have ever owned works the same way. It burns electricity to move heat out of a room and dump it into air that is already hot, which is why grid operators across the Northeast and Ontario spend every July watching the demand curve climb.
Toronto mostly skips that step. The downtown core is cooled by water pulled off the bottom of Lake Ontario, and once that water has finished chilling a hospital, an arena and a run of office towers, it goes into the city’s drinking supply.
Enwave Energy Corporation runs the network. Three intake pipes reach roughly three miles out into Lake Ontario, and a fourth was commissioned in 2024. They draw water at 4 C, about 39 F, from a depth of around 270 feet, where the lake holds that temperature all year no matter what the surface is doing.
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