Leicestershire County Council invested over £20 million in the rollout of LED street lights across the county. The 68,000 lights - which are controlled via a central management system - are saving around £1.7m per year thanks to a combination of reduced energy bills and lower maintenance costs. The LED street lights are also saving almost 7,000 tonnes of carbon each year.
The technology used has provided an economic, safe and sustainable means of lighting up the towns, villages and rural roads of the county.
Four years ago, work began to replace the traditional street lights with LED street lights These new lights are controlled by a central management system that provides flexibility in how lighting is provided, particularly with switch on & off times and variable light intensity to suit traffic conditions. It also means that they can be turned on temporarily during the evening to help emergency services at incident scenes or to dim/brighten lights if needed. The central management system also reports faults, thus eliminating the need for night-time visual inspections.
As well as reduced energy bills, the durability and reliability of LED street lights is significantly better than that of traditional street lights, thus reducing maintenance costs.
The work on the project began in February 2016 and involved replacing existing street lights, de-illuminating bollards and removing some unnecessary highway sign lighting. By March 2018, all the LED lights had been installed and the majority of the other work had been completed.
As a direct result of this project, the annual energy consumption has reduced from 20.8 million kWh in 2016/17 to 9.2 million kWh in 2019/20 (55%) and the annual CO2 emissions have reduced from 9,283T in 2016/17 to 2,536T in 2019/20 (73%).
It is worth pointing out that the carbon savings are greater than the energy savings because of the way the carbon used per kW is calculated. As more green energy comes online, the amount of carbon used to produce a kW of energy reduces. Over the past five years, the carbon conversion factor has almost halved, giving greater carbon savings.
The carbon saving of 6,747 tonnes is the equivalent of taking 1,458 cars off the road for one year.
At today’s energy rates, the switch to LED lights has produced and annual saving of around £1.7 million per annum.
Telensa, a smart street lighting technology company provided its PLANet (Public Lighting Active Network) central management system for the project. The Highways Street Lighting team was responsible for installing the LED street lights and Leicestershire County Council now operates the system.
The funding for the project came from a combination of Council reserves, as an ‘invest to save’ project, and Department for Transport (DfT) funding. The split was about 70% funded from LCC and 30% DfT.
It is important to produce a business case and project plan. You also need to ensure adequate staff resources are allocated to manage and deliver project, as well as to ensure there is buy-in at all levels for the project.
The introduction of the LED street lighting provided the opportunity to improve the council's control and management of individual lamp columns. This allowed the trimming and dimming of street lights to further improve the efficiency of the lights. This aspect of the project required good and clear communication with members and the public.
In addition to the reduced energy bills, the durability and reliability of LED street lights is significantly better than that of traditional street lights, thus reducing maintenance costs.
The technology is readily available, so this is a highly replicable project for other local authorities.
This project is an example of making changes that will benefit our community economically, socially and sustainably for years to come. The investment made in switching to LED lighting is already saving a considerable amount of emissions and money - the legacy of which we hope will be obvious.
Amount and cost of electricity used for street lights.
Number of street lights converted to LED.