Or maybe people just turned out the lights and went home

Calgary takes different tack on Earth Hour energy use

Judi Vandenbrink, executive director of EcoLiving Events who organized an Earth Hour gathering near the Bow River, said she noticed that many downtown office towers lowered their lights several hours before the official start time.

Indeed, Kaufmann said, Enmax’s energy consumption grid showed a slow and steady decrease beginning at about 4 p.m.

“It looks like people were making an afternoon out of it,” she said. “We didn’t see a sudden, sharp decrease.”