To do so, we used five of the state’s largest electricity companies to explore six things you'll have to evaluate when you're comparing plans and providers: We’ll walk you through customer satisfaction scores, running the numbers on rates, and calculating the impact of different fees, discounts, and contract types. We'll weigh in on extra perks, like points, and green energy too.

Another unwelcome side effect of not knowing your average monthly kWh usage level is that you may end up paying more than you expect. This can occur when a customer inadvertently shops an electric rate based on a higher usage level than they actually use. Electricity suppliers commonly advertise their electric rates associated with the highest (2000 kWh) usage levels since those tend to be the lowest rates.

It’s very important to do your own research to understand the business focus of the company you are considering, as well as tax advantages (and possible disadvantages) if the company is a limited partnership. For example, Seadrill Ltd. SDRL, -4.77%  provides offshore-drilling services worldwide. Seadrill Partners LLC SDLP, -3.52%  operates offshore-drilling rigs under specific contracts with several major oil companies, including Exxon Mobil Corp. XOM, -2.78%  and Chevron Corp. CVX, -2.81%  
Shopping for a plan based on renewable sources is no different than shopping for any other kind of plan — you calculate your costs the same way, look for the same fees, and weigh in customer satisfaction and other perks. The one thing that’s different is also looking at what percentage of your energy comes from renewable content in the EFL. That number can swing from as low as 0 percent all the way up to 100 percent, with the majority of plans that partially offset energy with renewable content hovering around 15 percent.
The offer information on the following pages is provided and maintained by Retail Electric Suppliers (RESs). While the ICC does not warrant that the information is a complete list of all residential offers in Illinois, RESs are required to honor prices listed here as a condition of posting their offers on this site. The ICC does not endorse or recommend any particular RES.
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.

Which ones the best? Like all things energy, it depends. Do you prefer predictability, or do you like the idea of potentially saving some cash by monitoring the market? Our (albeit conservative) recommendation: Fixed rate is probably best. Energy prices are on the rise — the U.S. Energy Information Administration predicts a 3 percent increase in residential electricity prices in 2018.

If you live in the greater Houston area, there are over 60 different energy suppliers competing for your business. Many of these providers have websites that are confusing and difficult to navigate, their rates buried in misleading advertising and dense jargon. Who has the time to sort through and keep track of options across all these different sites?