Circle of Blue
Summary
The energy system in the Great Lakes region, as in most parts of North America, is wasteful. Stupendously wasteful.
Consider these data points. Two-thirds of the energy generated by the 2,100-megawatt Pickering Nuclear Generating Station, east of Toronto, comes in the form of heat, not electricity. The excess heat is transferred to cooling water that is dumped into Lake Ontario.
For data centers, a booming, voracious energy user, nearly all the electricity that enters a facility to power servers turns into heat. Ejecting that heat so that the servers continue to support Zoom calls and ChatGPT queries can consume gobs of energy and water.
Thermal networks, such as district heating systems that circulate hot water or steam to multiple buildings, garner less attention. Comparable to a home radiator at scale, they have been part of the urban energy landscape for more than a century, predating the invention of the gas-powered automobile. College campuses have them, as do hospital complexes. Cities like St. Paul, Chicago, Rochester, and Lansing use district heating or cooling in their downtown cores. Toronto has a district cooling system that uses water drawn from deep in Lake Ontario to cool 80 buildings.
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