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British Gas is the UK's largest supplier of gas and electricity for domestic use and is part of the Centrica Group, which was formed following the merger of British Gas plc in 1997. British Gas also operates under the names Scottish Gas in Scotland and Nwy Prydain in Wales.

EDF Energy is one of the UK's largest generators and suppliers of electricity. They source from a variety of methods, including wind farms, power plants and more traditional methods.

E.ON is one of the UK's largest electricity and gas suppliers. Formally known as Powergen, the company was created in 1990 and was subsequently bought by German energy giant E.ON in 2002. It assumed the name of its parent company E.ON in late 2007.

npower supplies gas and electricity to around 3.1 million customers in the UK. Originally established as National Power in 1990 following the privatisation of the state-owned Central Electricity Generating Board, npower is now owned by RWE Group which incorporates Germany’s leading gas and electricity companies.

ScottishPower provides gas and electricity to over 5.6 million domestic customers in the UK and maintains a large distribution network. ScottishPower was formed in 1990, following the privatisation of the previously state-owned Scottish electricity industry. In 1995 it acquired the regional supplier, Manweb.

SSE (formerly Scottish and Southern Energy) is one of the 'Big Six' suppliers. It is the parent company for SSE Atlantic, SSE Scottish Hydro, SSE Southern Electric and SSE SWALEC. SSE manage the largest distribution network in the UK and supply to more than 10 million.

SSE Atlantic supplies gas and electricity throughout the UK. The company was acquired by SSE in 2004 and services the Midlands, East Midlands, Yorkshire, Northwest and the North.

Co-operative Energy is part of the Midcounties Co-operative, and although founded by a regional co-operative, Co-operative Energy is a national business, covering the whole of England, Wales and Scotland.

EBICo is a not-for-profit gas and electricity supplier founded in 1998. They offer the only gas and electricity tariffs in the UK where each unit costs the same, regardless of high, medium or low usage.

Ecotricity is dedicated to building new sources of renewable energy and invest more per customer in this than all the other UK suppliers together. The more customers the company has the more investment they can make in building new renewable capacity.

First Utility is one of the fastest-growing suppliers in the UK and was founded in 2008. It is also one of the largest independent gas and electricity suppliers, making it a main challenger to the big six.

Flow boasts competitive tariffs, UK-based customer service, and exciting energy products – including its patented electricity-generating domestic boiler.

Good Energy is an award-winning green energy supplier, sourcing its electricity from renewables like sun, wind and water. The independent supplier's plans are also competitively priced compared to the big six's standard dual-fuel tariffs.

Green Energy UK sources its energy from UK-only renewable sources, excluding nuclear power. Green Energy offer three tariffs: Still, Sparkling and Tap. The Sparkling tariff is 100% renewable, utilising sources including hydro, solar, wind and organic waste material.

LoCO2 Energy is a family-run, British-owned renewable energy supplier offering affordable low-carbon energy.

M&S Energy are supplied by SSE, offering gas and electricity plans from the well-known retailer.

OVO Energy is an independent energy supplier offering plans that are “greener, simpler and cheaper.” They aim to build the UK’s most-trusted energy company.

Sainsbury’s Energy is a partnership between Sainsbury's and British Gas. Customers earn Nectar points that can be used for shopping in Sainsbury’s stores.

SSE Scottish Hydro is in the SSE Group, which manages the largest distribution network in the UK. Formed in December 1998 following the merger of Scottish Hydro Electric and Southern Electric.

SSE Southern Electric is in the SSE Group, which manages the largest distribution network in the UK. Formed in December 1998 following the merger of Scottish Hydro Electric and Southern Electric, the group also includes SSE Atlantic and SSE Scottish Hydro, among others.

Spark Energy is an energy company that previously focussed on landlords, but has since began providing plans for the entire domestic market.

SSE Swalec is part of the SSE Group, which manages the largest distribution network in the UK and services more than 10 million customers. The group was formed in December 1998 following the merger of Scottish Hydro Electric and Southern Electric.

The Utility Warehouse is one of the smaller energy suppliers in the UK, and its aim is to offer a variety of different utilities under one roof.

Utilita is the leading supplier of pay-as-you-go energy in Great Britain using smart meter technology.