Cheap gas bills could be enjoyed by the 20 government agencies, non-departmental public bodies and ministerial departments that have signed up to cut their carbon emissions.
The Carbon Trust has revealed they want to help reduce carbon emissions across the central government's portfolio by ten per cent within 12 months.
While reducing energy usage could help the departments go green, it may also result in cheap gas bills, cutting power expenditure.
Chief executive of the Carbon Trust Tom Delay said: "Making the public sector energy efficient makes perfect business sense. It is a golden opportunity to deliver rapid cost savings while cutting carbon emissions."
The 20 organisations together spend approximately £120 million a year on energy, while central government's estate forks out almost £500 million on an annual basis.
Under the 2008 Climate Change Act, Britain noted it aims to reduce the country's carbon emissions by at least 80 per cent by 2050.
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