A number of blue chip names in banking, building and energy have signed a deal to create a unique not-for-profit financial company which will deliver billions of pounds of energy efficiency investment to residential and business premises.

The aim of the companies, which include power companies British Gas and E.ON, retailer B&Q and the banks HSBC and Goldman Sachs, is to ensure low-cost finance is available to the 14m homes the government hopes will be refitted by 2020 under its green deal starting in October 2012.

The green deal will enable homeowners and businesses to access loans for loft lagging, cavity wall insulation and other efficiency measures. It is a rule of the scheme that the savings on energy bills must be at least as big as the loan repayments.

Companies and banks had feared that if the loans were priced at personal loan rates, only basic efficiency measures could be funded without breaking the rule, limiting effectiveness of the scheme in cutting carbon emissions.

“The new company would put together as many loans as possible and very quickly give access to the capital markets,” said Paul Davies, a senior partner at consultants PwC who is co-ordinating the founding of the Green Deal Finance Company.

While the 16-strong consortium includes rival firms, Davies said they had an interest in founding the green deal market. “They will collaborate first, then compete.” He believed the move by such big companies to found a not-for-profit venture to build a new market is unique in Britain. Davies expected that the finance consortium would run a loan book of billions of pounds a year, rising over the next decade to £10bn a year. The green deal is a flagship policy for the government in its drive to cut the nation’s carbon emissions and to reduce fuel poverty. A quarter of the UK’s emissions come from heating and powering homes – many of them ageing and leaky – with a similar amount coming from industry and businesses. The UK has a legally binding commitment to fight climate change by cutting carbon usage.