The A14 Integrated Delivery Team (IDT), working on behalf of Highways England, is currently the largest user in the country of year-round temporary solar trailer lights.
Using temporary solar lighting wherever possible will save the A14 project more than 1,000 tonnes of CO2 over the course of construction, contributing significantly to Highways England's environmental impact goals and supporting its commitment to source all project electricity from 100% renewable sources.
A total of 24 Prolectric ProLight solar lighting towers have now been deployed at the three compounds along the construction route between Cambridge and Huntington, illuminating site operations and helping to protect worker safety. As a result, a saving of 264,000kgs of CO2, 98,800 litres of diesel, and £80,454 of manpower costs have been achieved in the past 12 months.
Highways England Project Director David Bray said: "The use of renewable power sources on the A14 scheme helps us to work in greater harmony with the environment."
The Prolectric ProLight provides year-round solar-powered temporary lighting with powerful LED illumination. The trailer-mounted battery capacity has been developed to be three times that of any other temporary solar trailer lights, so that even on winter days with 16 hours of darkness, the unit operates consistently and reliably.
Trials of a ProLight solar lighting tower were initially conducted on the Brampton compound in March 2016, to assess the potential use of solar power as an alternative to conventional diesel-generator lights. Following a successful evaluation, the A14 IDT bought a further six units. Now a total of 24 ProLights are deployed on the project in preference to diesel-powered lighting wherever possible.
Vinny McCabe Senior Works Manager for Section 3 said: "Since the initial trials, our use of the ProLights has increased and we are now able to remove diesel lights wherever we can. We are currently using ten in my section and they are operating throughout the night and at the weekends.
"We are using ProLights to illuminate two newly-constructed permanent roundabouts, enabling works traffic movements and site safety until permanent street lighting is introduced. Further lights are illuminating temporary bridges and laydown areas to enable safe loading and offloading of construction materials.
"Using the lights has saved hugely on our diesel costs and just as important have been the savings in manpower. The ProLights operate automatically, so we have saved the costs of paying two workers to return to a diesel light and switch it on in the morning and off again at night, especially at weekends.
"Without diesel, there is no danger of an environmental impact through spills and no need to move temporary lights away from sensitive areas such as watercourses, before refuelling."
All ProLight solar units used on the A14 have been fitted with an upgrade that enables the works team to power 1800w hand tools with the solar energy generated and stored in the light's battery system. The enhancement has increased the team's ability to reduce carbon impact, as well as removing the noise and fumes of diesel generators.
Fitted with a micro-controller and GPS, the 'smart' technology of the ProLights enables on and off times to be controlled automatically, while power usage and carbon savings data can be monitored and recorded via a web portal.
Although all customers have real-time web access to a Remote Monitoring Service, Prolectric can also provide daily monitoring and control to optimise the performance of each unit, as well as regular reports of a range of performance data including carbon savings.
Eric Milne, Section 2 Senior Works Manager, was involved in the early trials and has continue to use the lights: "The great thing about Prolectric' s ProLights is that we haven't had to touch them since they were delivered," he said: "If we want to change the on/off setting we can simply call Prolectric and they will adjust the time setting using their portal. It makes sense for us to use our site resources elsewhere and let Prolectric manage the lights for us and ensures we get optimal usage from them."
The A14 is the UK's biggest road construction project with a £1.5bn budget to upgrade 21 miles of trunk road between Cambridge and Huntingdon. A 2,000-strong construction team is at work with a target for completion in December 2020.