Again, switching is a seamless process. You will not notice the transition whatsoever. Your service will have absolutely no interruptions in the slightest. Your electricity still comes from the same power plant(s) and over the same distribution network (wires). The only thing that changes is your retail service provider (billing company). The electricity or gas will be no different than before or after the switch. The only difference you will see is the price of the supply on your bill!