The provider you choose has nothing to do with the delivery of your electricity. Your electricity is delivered by the still-regulated local wires company (your Utility), ensuring for you the same safety and reliability regardless of which provider you choose. Your chosen Provider buys or reserves energy in bulk and hopes to turn a profit by taking on the overhead of attracting and maintaining customers. Your utility is the one delivering your power. Your provider is only responsible for billing you for your usage.
Will my choice of an electric company affect the reliability or availability of my electricity service?