Nottinghamshire County Council expects to reduce its annual energy bills by £300,000 over the next 12 months.
A report by the council said that it had saved almost £600,000 from 2013-2015 and that the savings are being re-invested into local services.
The savings were generated through energy buying measures, a switch to more energy-efficient lighting, such as LED street lights and the use of solar panels at council premises.
The LED Project has seen 24,000 LED lights installed in the county since the policy’s approval in 2013. A further 10,000 lights will be installed over the next three years with most work expected to take place in Rushcliffe.
The LED project is expected to save £1.5m per year from falling maintenance and energy costs once the project is completed, the council said.
The council’s measures have curbed carbon emissions in buildings and street lights by 21% since 2010/2011.
David Kirkham, the county’s chairman of finance and property committee, said: “Installing new LED street lighting and equipping our buildings with improved heating controls and energy management systems has helped us reduce carbon-dioxide emissions by more than a fifth since 2010/11.”
The council said it spent £6.7m during 2015-2016 on gas and electricity bills and will reduce the spend by 5% in the coming year to £6.4m.
An additional £1.4m will be invested in building solar panels on the roofs of 30 council buildings, which is predicted to generate savings of about £175,000 a year for the next 20 years.
It also expects to invest £2m in replacing older more polluting coal, oil and LPG boilers in council properties with biomass heating systems.