The energy adviser’s data show that Scottish Power was the last of the UK’s biggest providers to feature in the best buy table but dropped out in mid-February following a cheaper deal from independent provider Ovo Energy.
Only two of the big six appear in the current top ten: British Gas and EDF Energy are in sixth and eighth place respectively with fixed price deals, MoneySuperMarket said.
Currently, the best deal on offer is from Co-op Energy, it added.
However the site cautioned consumers to keep tariff exit fees in mind before moving to a cheaper deal, noting that some of the largest fees are charged by the smaller independent suppliers.
Six of the site’s top ten energy tariffs include an exit fee, with the most expensive being £60 from smaller suppliers First Utility, Ovo Energy and Green Star Energy.
“People thinking about taking advantage of cheaper deals offered by smaller suppliers need to be wary of exit fees. If energy prices reduced, it may not be worth switching if it means incurring a £60 exit fee,” the site said.