Napkin math: Stoney Trail is 100,000 meters long, Google says an LED streetlight pulls 73W so I'll call it 100, if the lights are spaced 50 metres apart that means 4,000 fixtures for both directions, so Stoney pulls 400,000 W, i.e. 266 space heaters at 1,500W each.
Where it gets interesting is lights that have not been converted to LED which can draw up to 10x more... provincewide it's certainly significant enough to have impact.
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