Ideally, the switch should take no longer than 17 days from the date you arranged to change supplier. This allows for a 14 day "cooling off period" where you can change your mind about switching. This comes after energy regulator Ofgem challenged gas and electricity companies to cut their switching times.

The best energy companies in the country are Southern Company, NRG Energy, Ameren, NextEra Energy, PPL, ExxonMobil, Baker Hughes, Duke Energy, Conoco Phillips, and Chevron.

Energy companies are the ones that are involved in the production and sale of energy including fuel extraction, manufacturing, refining, and distribution.