Octopus Energy Group is a British renewable energy group specialising in sustainable energy. It was founded in 2015 with the backing of British fund management company Octopus Group, a British asset management company. Headquartered in London, the company has operations in the United Kingdom, France, Germany, Italy, Spain, Australia, Japan, New Zealand and the United States. Octopus is the UK's largest supplier of electricity to domestic customers, and the second largest in domestic gas.