- Hydro Ottawa measured the city’s usage at 697,270 kilowatt-hours (kWh) between 8:30 and 9:30 p.m. a reduction of 43,581kWh (6%) – compared to the same hour on the previous Saturday.
- This represents enough electricity savings to power 58 homes for a month.
- Hydro Ottawa is responsible ... delivery of electricity to more than 291,000 residential and business customers in the city of Ottawa and the village of Casselman.
So ~1.1 Million people in Ottawa Carleton managed to save enough power for ~0.000199312715% of Hydro Ottawa's customer base for a single month. (Rounded that's 1/5,000th of their customer base).
I'm still trying to find numbers that show how 9:30-10:30 right after Earth Hour compare to the same hour the week before. I also tried finding Ottawa's annual consumption numbers with little luck (if anyone has any ideas please leave a comment).
Here are some posts from a friend of mine on the topic: