Besides the lower energy rate, not much changes for you. The utility company is still responsible for the distribution of the electricity and natural gas to your homes and businesses, regardless of the energy supplier.
The price for the electricity and natural gas supply is not set by the utility company. You can now choose who you want to supply the energy to your local utility company. In most cases, your current local utility will still bill you. In some cases, you can choose to pay the supplier separately.