You’ll never experience any interruptions when you switch electricity companies. In fact, service reliability is never affected at all. It typically requires 7 days for the new plan to go into effect and you won’t even notice when it happens. However, you want to make sure that you never make this switch before your current contract is up. Doing so could mean you’ll have to pay early termination fees or penalties.
Minimum Usage Fees: Often set at or around 1,000 kWh/month, these fees mean you’ll always pay for at least that amount — even if you only use, say, 800 kWh of electricity some months. It sounds nasty, but it’s only something to be concerned about if your electricity bills historically show you hover right around that minimum use threshold. If you’re electricity use always exceeds that amount, it’s like it’s not even there.
Utility companies are responsible for transmission and delivery of electricity even in energy deregulated parts of Texas and should be contacted in the event of a power outage. Your retail energy supplier may provide you competitive electric rates or exceptional customer service, but they cannot repair power lines or restore your service. In the case of an emergency, contact:

In this free market competing electricity retailers buy electricity wholesale from private power generators to sell at retail to around 85% of Texas residents. The partnership between generators and retailers is governed by the Electric Reliability Council of Texas, or ERCOT, which attempts to balance the power grid’s electricity supply and demand by purchasing small amounts of electricity at 15-minute intervals throughout the day.