The Carbon Trust should encourage the expansion of the energy advice market and use the public funding it receives to reach a wider audience, says the National Audit Office.

In a report on the government鈥檚 energy saving body, the NAO said the trust should 鈥渆xplore the potential for developing a franchise model which will maintain or increase existing demand for energy advice but will enable accredited third parties to offer organisations advice鈥.

The NAO also criticised the Carbon Trust for failing to achieve a higher implementation rate for its recommendations.

The criticisms are contained in an NAO report published on 22 November, but there were positive comments too.

According to the report, the Carbon Trust used 拢100 million of government funding to deliver CO2 savings of between 1.2 million and 2 million tonnes, which the report claims is 鈥渆quivalent to a projected financial saving of between 拢222 million and 拢359 million in future reduced energy costs鈥.

The NAO says that on this basis the trust鈥檚 advice to businesses has proved value for money.