Scottish Power, is a vertically integrated energy company with its headquarters in Glasgow, Scotland. It was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index but in 2006 it became a subsidiary of the Spanish utility Iberdrola. It is the Distribution Network Operator (DNO) for the central and southern Scotland and the Merseyside and North Wales regions. It is also the Transmission Owner (TO) for the south of Scotland. The company also supplies electricity and gas to homes and business around the United Kingdom and generates power for supply to the grid. It also owns PPM Energy in the United States.

EDF Energy, is one of the UK’s largest energy companies and its largest producer of low-carbon electricity. A wholly-owned subsidiary of the EDF Group, one of Europe's largest energy groups, we generate around one fifth of the UK's electricity and employ around 15,000 people. We supply electricity and gas to around 5.5 million residential and business customers, making us the biggest supplier of electricity by volume.

British Gas Business, We are one of Britain's leading business energy suppliers. We are dedicated to the needs of small to medium-sized customers through to large industrial and commercial energy users. In total, British Gas Business has more than 950,000 business sites throughout Great Britain. Our parent company Centrica is a top 30 FTSE100 company with growing energy businesses in the UK, North America and Europe.Centrica has a market capitalisation of around £13bn, 33,000 employees worldwide and is investing over £1 billion a year between 2008 and 2010 to secure new gas and power supplies for the UK.

Gazprom, Gazprom Marketing & Trading Retail Limited (GM&T Retail), one of the UK’s fastest growing energy suppliers , is delighted to announce that it has successfully completed its brand review today as it unveils the company’s new brand name - Gazprom Energy. Gazprom Energy’s brand values and attributes include: being honest, open, ethical, cost-effective, flexible, innovative, helpful, direct, aware and agile among others.

British Energy, British Energy delisted from the London Stock Exchange on 3 February 2009 and is now part of EDF Energy. The combination of EDF Energy and British Energy forms one of the UK’s largest energy companies. The combined business is the UK’s biggest producer of electricity and together provides power to a quarter of the country’s population. With a current installed capacity of around 16.5GW, it supplies gas and electricity to over 5.5 million business and residential customers from our nuclear, coal and gas power stations, as well as combined heat and power plants and wind farms.

Haven Power, iLaunched in 2006 specifically to serve the electricity needs of small to medium sized business customers and provide an alternative to the large multinational power suppliers Haven has grown significantly. Now employing over 300 staff and with a turnover in excess of £100million the business has gone from strength to strength. In early 2009 Haven Power was acquired by Drax Power Limited, one of the UK's largest generation groups. With the financial backing of Drax, Haven Power has grown its SME business and established a team who specifically serve the large I&C customer sector. Following this move the company's customer base has expanded significantly and now includes some of the UK's leading business names.

Bizz Energy, is a highly competitive, leading-edge, licensed supplier of electricity to the sub 100 kW and Half Hourly metered markets. BizzEnergy was founded by highly regarded industry experts and is run by a dynamic team of energy sector professionals. We run all operations in-house, including our Ofgem accredited, state-of-the-art registration and multi-site billing system.

Bizz Energy ceased trading in 2008. All customers were acquired by British Gas.

Opus Energy, Opus Energy is a leading independent supplier of gas and electricity to the business sector, offering companies a competitive source of energy and a high standard of customer care. Established in 2002, Opus Energy supplies energy to over 100,000 properties across the UK. Many of our customers are small and medium sized businesses who enjoy the savings we can offer, along with flexible and accurate billing. Our long term power supply agreement with one of our major shareholders, International Power Plc, enables us to provide our customers with a reliable source of low-cost electricity. We are also a significant provider of power to the retail industry, the Government sector and to housing associations across the UK. Some of the household names supplied by Opus Energy include Rushcliffe Homes, Stagecoach and FirstGroup.

Electricity4Business, E4B is Britain 's independent business electricity retail company specializing in the supply of electricity to small and medium sized businesses. E4Bs aim is to cut the cost for British business by offering lower electricity prices.Our business electricity services are for small or medium sized business spending less than £100,000 per year.

E4B ceased trading in 2008

Corona Energy, Corona Energy is the leading commercial energy supplier to British based businesses. The supply of natural gas has been our core activity since the company was established at the time the market was deregulated, so we know the commercial gas market inside out. More importantly, we know exactly what our customers want and with our flexible, responsive approach, we strive always to meet your needs by delivering outstanding service levels and first-rate customer care. In short, great service comes naturally to us, and we supply a substantial share of the UK commercial gas market as a result.

Shell Gas, Shell Gas Direct has been supplying natural gas to businesses across the UK since 1989. Our focus on ensuring customer satisfaction has won us a regular top ranking in independent market surveys. We are the UK branch of Shell Energy Europe Ltd, supplying all your energy needs across Europe. Our customers range from small businesses to large corporations, in markets as diverse as catering, launderettes, local authorities, nationwide retailers, offices and energy-intensive industrial plants. As a wholly owned subsidiary of Shell UK, part of the Shell Group, we give you the assurance of Shell's substantial North Sea gas reserves and the expertise of our gas trading team to manage your gas supply professionally.

Total Gas and Power, is one of the leading UK gas and electricity suppliers to industrial, commercial and small to medium businesses. No matter what size your business, switching your gas or electricity supply couldn't be easier. With a wide range of innovative, flexible gas and electricity supply contracts on offer and a UK based customer service team, we are confident that we can meet your individual business needs.

Gaz de France, Part of the GDF SUEZ Group, the world’s largest utility company, GDF SUEZ Energy UK is well established as a specialist energy supplier to industry and commerce across the UK, as well as a growing player in the electricity generation arena. We offer an innovative range of energy supply products to meet the requirements of all types of businesses and are constantly developing new products and adapting our services to meet their needs.