23,000 more energy-saving LED streetlights are set to be installed across the county by Essex Highways.
Essex County Council is investing £9.1 million to convert a further 23,000 high-wattage part-night lights to save £21 million over 20 years.
This is in addition to the 19,000 all-night streetlights currently being converted to LED up until April 2018 delivering a saving of £24 million over 20 years.
Councillor Ian Grundy, Essex County Council Cabinet Member for Highways, said: “This is a massive investment to improve street lighting for decades to come.
"LED lights use less electricity, provide better light, are totally recyclable and last far longer; therefore reducing maintenance costs.
"Each light converted will use on average 60% less electricity and thanks to interest-free loans we will make our money back in ten years, with massive savings each year after that.
"We prioritised LED all-night lights as they are they were costing taxpayers the most.
"Now we are targeting next biggest energy users, higher wattage part-night lights on main roads, to deliver the best value for money to the taxpayer."
The project to install the 23,000 further LEDs across the county will start in September 2017 and finish by January 2019.
LED lights contain no toxic materials and are guaranteed for 20 years.