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.
Most of Direct Energy’s plans allow you to earn Plenti points — you get 1,000 as soon as you sign up. That initial windfall is about as good as it gets. You keep accumulating rewards with every payment, but just one point for every dollar you spend on supply charges (what you pay to Direct Energy vs. your EDC — so about two-thirds of your total bill). A Plenti point equates to about one cent, so that 1,000 point bonus works out to $10 when you cash it in with a Plenti merchant (Rite Aid, Macy’s, etc.) You’d have to spend a further $1,000 in supply charges before making off with another $10.00 in Plenti points.
Landsvirkun, Iceland’s national power company, offers electricity to buyers for as low as $0.043 per kWh, which is nearly on par with what can be found in Washington State. Coupled with 20% corporate tax, the nation’s low energy prices have attracted not just data centers, methanol producers, silicon metal producers but also aluminum companies—which, again, consume massive amounts of electricity.