Opus Energy Limited supplies gas and electricity to businesses across the United Kingdom.

It purchases electricity from wind, solar, hydro, and anaerobic digestion generators, and provides support to develop energy-generating sites.

The company was established in 2001 as Oxford Power Holdings Limited; it was renamed on 28 October 2010.

On 6 December 2016 it was announced that Opus Energy had entered into a binding conditional agreement for the sale of the entire issues share capital to Drax Developments Limited, a member of the Drax Group.

[5] On Thursday 8 October 2020, Opus Energy announced that its Fuel Mix Disclosure for the reporting period April 2019 to March 2020 remained 100% renewable.