Deemed rates (also known as out of contract rates) apply when a business hasn't renewed their energy contract or switched supplier at the end of the contract period.
These rates can also apply following a change of tenancy (COT) when the new business has not negotiated a contract with the supplier. So it's important to keep on top of this otherwise you could be paying double for your electricity (ouch!).
You can find out more about Squeaky's deemed rates here.