Work is set to begin this month to convert streetlights across Caerphilly County Borough to LED.
Part-night lighting between midnight and 5.30am will also be implemented to all lights across the borough, except at junctions and in town centres.
Streetlights along roads connecting towns and villages are already switched off by the council between midnight and 5.30am.
But the part-night lighting scheme will now be rolled out to all residential areas except junctions and the town centres of Bargoed, Blackwood, Caerphilly, Risca and Ystrad Mynach.
Caerphilly County Borough has 27,300 street lights in total. The programme to convert the lanterns to LEDs and implement part-night lighting to over 20,000 of the lights is scheduled to begin this month and will continue on a ward-by-ward basis for the next two years.
The move could save the local authority almost £940,000 and cut CO2 emissions by more than 2,800 tonnes.
The council is hoping to cut costs after being hit with an energy price hike of 13.4% – equating to £165,000 – last year.
The conversion to LED street lights is expected to save the council around £939,840 a year.
While costing around £4.2 million to implement, the council has taken out a £4.1 million interest free loan from Salix – a Government-backed organisation that lends to the public sector for energy saving projects.
Deputy Leader of the council, Cllr Sean Morgan, said: “We’ve already achieved significant savings by fitting energy efficient LED lanterns to over 11,500 columns and through part-night lighting in non-residential areas. As well as the financial saving, just as significantly these measures have also helped reduce our carbon footprint.
“It was important however that we looked to do even more to reduce costs and become even more energy efficient. This programme of works will help ensure a consistent approach to street lighting across the county borough, play a key role in delivering on our carbon reduction commitment and help put us on a sustainable footing for the future.”
Meanwhile, the installation of energy efficient lighting in the council’s headquarters in Tredomen has been approved by the council’s cabinet.
This decision is expected to reduce the council’s annual electricity bill by £24,000 and reduce it’s carbon footprint by a further 83 tonnes a year.
Cllr Lisa Phipps, Cabinet Member for Homes and Places said: “The existing compact florescent lights within Penallta House are to be replaced with modern, energy efficient LED fittings which use 75% less electricity than the existing units.”
Additional reporting by the Local Democracy Reporting Service.