Construction Operations Maintenance Alliance

Construction Operations Maintenance Alliance

. .. Hinkley Point C

Construction Operations Maintenance Alliance


Wessex Water

Primary Client:

Nuclear New Build Generation Company (NNB GenCo)


Hinkley Point Somerset


July 2015; continuing. Ten year time frame.

Key Facts:

  • One of the largest projects in Europe
  • Collaborative working
  • Highly complex project environment
  • Nuclear Build Protocols
  • Shortlisted for SW Built Environment Award - SME of the year 2019


The Construction Operations Management Alliance (COMA) group is a Tier 1 partnership arrangement of three south west businesses providing construction utilities and enabling services to the Hinkley Point C project in Somerset. The project is one of the largest construction sites in Europe and will deliver the first nuclear power station to be built in the UK for a generation.

The alliance was formed in 2015 and in July the same year, was announced as one of five local supplier appointments. This was even before EDF Energy’s Final Investment Decision.

These announcements followed three years of innovative and intensive activity by the suppliers, EDF Energy’s Project Delivery team and the Somerset Chamber of Commerce. The approach taken by EDF Energy focused on developing a partnership approach to delivering project needs, giving the local supply chain the opportunity to work up viable, competent and competitive proposals. Large infrastructure projects in the UK had not engaged with local supplier groups in this way before.

This partnership approach has been sustained by the three member companies; Wessex Water, Hydroline Solutions and MMES2012, with a philosophy of taking the experience and expertise of each member of the group to develop a learning and supportive culture. The group’s pride in promoting a safe working environment to deliver top quality services to HPC was recognised when it won the Best Safety Performance – Local Supplier award at the HPC Excellence Awards 2018.

The group is responsible for delivering a range of services to HPC and its associated development sites. These include; potable water supplies, water drainage systems, roadway and pedestrian walkway lighting systems, electrical distribution systems, environmental recovery work and specific civil engineering enabling works.