The Challenge:

Working as part of UK Power Networks’ ED1SON Alliance, Kier were tasked with connecting power and communication cables to one of the largest and most advanced battery storage plants in the UK. 

Located near Burgess Hill in West Sussex, the new site from Harmony Energy and FRV comprises 34 MW / 68 MWh of Tesla’s Megapack utility-scale lithium-ion battery storage solution across 28 separate units. The state-of-the-art units are optimised for real-time trading and control applications, using Tesla’s Autobidder artificial intelligence platform.


The Solution:

To connect the battery storage unit to UK Power Networks’ distribution network, Kier embarked on a four month programme of works, including:

  • 1.5 km of 33 kV power cables and fibre optics from a local substation to the new battery charging and storage centre.
  • Use of horizontal directional drilling.
  • A specialist rolling traffic management system, approved by the Highways Authority and the Local Council.
  • Enabling works (including structural modifications) for new switchgear at a local switch house. 

Due to the proximity of the site to the public, Kier operatives frequently interacted with pedestrians, dog walkers, cyclists, horse riders, and other road users, with overwhelmingly positive feedback received.


The Impact:

The works were delivered successfully and as a result, the Contego site is now directly connected to UK Power Networks’ distribution network, providing the capability to store energy from renewable sources and afford peak-time flexibility to the UK National Grid as part of the country’s continuing move away from fossil fuels.

Amongst its accolades, the project was awarded a Considerate Constructors Scheme Certificate of Excellence. The project scored Excellent or above in all categories, including Appearance, Community, Environment, Safety and Workforce.

UK Power Networks praised the safety performance, citing the frequent and open communication between the whole project team and the proactive approach to resolving issues. 


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