Do not show your Hydro Bill to them
They are electricity retailers. If you sign up with them, you will pay consistent electricity price to them during the contact valid year. Since right now, Ontario has electricity consumer price protection plan, the retailer's price is more likely higher than the protection plan's price. So it is not worth to sign up with them. Some retailers are not following the business legislation. It happened before that some retailer salesmen stole the customer's Hydro account number and inform Hydro distributor they signed up with the customer. It caused a lot of trouble for the customer. So if you do not wish to sign the contact, do not show them your Hydro bill.
For your info. Your electricity bill consists of four types of charges: Electricity, delivery, Regulatory, Debt retirement charge. If you signed up with a retailer, only electricity rates will be changed, other three charges will remain the same.