There are a few things you can check for in your rental agreement that may affect your usage of energy.
Your rental agreement should state who is responsible for paying your energy bills. If this is your responsibility, consumer protection laws allow you to choose your energy supplier and your landlord should not stop you from changing your supplier without fair reason.
Check your contract for energy supplier clauses. There may be a 'default supplier clause' in place, meaning your landlord has chosen a specific supplier that you will be under by default. Those responsible for their own bills can still change their supplier, but if your landlord pays the bills you may have to discuss this with them if you wish to change.
Also, if your contract has notice/return clauses, you may have to inform your landlord if you plan to switch supplier, even if you pay your own bills.
For more advice on how renting affects your bills, contact YES Energy Solutions.