Some 22 organisations, including merchants and utility companies, have signed up to be among the first Green Deal providers in October.

The companies have met with Climate Change Minister Greg Barker, and have signed an agreement to work with government to help implement the Green Deal.

Included in these organisations are merchant company Grafton Group, utility companies including British Gas and E.ON, Kingfisher which owns B&Q and Screwfix, and installation companies including Enact Energy and Mark Group.

The Green Deal is the government’s plan to improve the energy-efficiency of the nation's homes, at no upfront cost to the consumer. The providers will be offering energy efficiency packages to consumers when the scheme launches in October.

Barker said: “The signing of this agreement between government and business pioneers represents a watershed moment in the development of the Green Deal. We will be working with these organisations to ensure they can fulfil the potential they have demonstrated today and become the first to offer Green Deals.”

Gearoid Lane, managing director of British Gas New Markets, said: “We know that household budgets are stretched at the moment but higher energy prices don’t have to mean higher bills. Britain’s housing stock is some of the most inefficient in the developed world with £1 in every £4 spent on heating our homes wasted because of poor insulation. The Green Deal is an innovative way to help households cut their bills while improving their home. British Gas is proud to be one of the first green deal providers in the country.”

Paul Roche, director of sustainability and renewables at Grafton Group, said: "As a builders' and plumbers' merchant, we have an important role to play, supporting installers and product manufacturers on a daily basis. We take our commitment to sustainability very seriously, and all it stands for. This initiative brings together major players within the industry and demonstrates how we are all working towards that common goal, to reduce carbon emissions."

The full list of organisations which have signed the agreement are: