When it comes to the electricity itself, there is no difference at all. A cheap electric supply is the same electricity, it's simply provided by a new supplier (unless you opt for green energy - more on that here). As suppliers buy and generate different sets of energy they also have different prices. What's more, you might be on a tariff that is simply more expensive, such as a standard tariff. If you decide to switch electricity don't equate a lower price with worse service.

For example, if you use a small amount of energy each month, you expect to be rewarded — right? Unfortunately, nearly all electricity plans from Texas REPs are advertised as costing more per kWh the less electricity you use. It’s a little like buying in bulk: Providers often discount your bill when you cross certain kWh thresholds. For instance, one 12-month plan from StarTex Power quotes 8.1 cents per kWh for 1,000 kWh a month and 8.8 cents for 2,000 kWh per month, but 12.1 cents for 500 kWh per month. Why the difference? Customers get $35 back each month if they pass 1,000 kWh of use, and another $15 back per month if they cross 2,000 kWh. In this case, using half as much electricity as your neighbor on the same plan wouldn’t get you half the bill.

Electric bills for customers in the Houston area can more than double in summer months, mainly because air conditioning. Not coincidentally, electric rates also rise in the summer months because of this increase in demand. The most dramatic rate increases occur in month-to-month plans, but electric rates do increase across the board for all fixed-rate contract lengths.
2.     Fraud:  Too many people have been victimized by glib sales reps with promises of cheap electricity flowing in an unending stream only to discover that, as is so often true, “it ain’t necessarily so”.  They’ve been locked into unwanted term contracts or there’s a catch – some utilities will give you the great rate only if you meet a usage minimum; basically, the “rate” is, in actuality, a “bulk purchase” discounted fee – or they paid a deposit never to hear from the rep again.