Hydro One officials first wanted to set the record straight.
"The outage has nothing to do with the supply into Toronto, and it has nothing to do with aging infrastructure." said Mike Penstone, the Vice President of Planning at Hydro One.
So what knocked out power to about 250 thousand west end Toronto residents for more than 2 hours on Tuesday night?
"The outage was caused by a contact between a Hydro One transmission line, and a distribution line that was built beneath it."
Essentially, what that means, is that the demand increased, which built extra heat into the wires. When that happens, they actually sag closer to the ground.
When that happened, two wires touched, creating a flash, and power was knocked out.
As for making sure the problem doesn't happen again, Penstone says they are going to create more space between the two lines, giving them an extra buffer.
The outages also affected TTC travel. Subway service between Jane and St. George stations was suspended because of signal problems. It was back up and running after 11 p.m.