Swytcheroo is a completely free service to assist people when they move into a new home and have to register for utilities.
Yes, you've arrived at Swytcheroo probably because you've just moved into a new property, so you have to register for Utilities. Once you sign up for a supply, you can change at any time, but just beware of any minimum terms or early cancellation fees if you swytch early.
A fixed rate stays the same throughout your contract, while a variable rate can change monthly based on market conditions.