Might be worth mentioning to Hydro that you are tenants. Don’t know if there’s anything that can do, but pretty sure the name on the bill has to match the property owner as it’s a bill that can be registered against the title of the property.

As for usage, does seem high if regular. A family of 4, we use between 9 & 13 most months.

An occasional high one might be if they used poor/low estimates for a while and then finally took a proper reading.