Opus Energy, with British nationality, was founded in 2002 and is one of the most challenging business energy suppliers in the UK as compared to the main big-six. Though they are not the cheapest in terms of prices but the customer service they hold is truly marvelous. After all, they return and answer 90% of their calls in just one minute, saving the time and energy of their customers and solving their queries as soon as possible.
They offer both fixed and variable-rate contracts for 1, 2 and 3 years.