The UK’s electricity network upgrade is accelerating as National Grid has appointed 13 contractors to deliver a major pipeline of substation construction and upgrade projects across the country.

The appointments are part of a new dynamic market framework, designed to support the rapid rollout of high-voltage infrastructure required for the UK’s energy transition. The framework is already active and remains open-ended, allowing additional firms to join over time.

The selected contractors will compete for a growing number of substation projects, including large-scale developments and upgrades on the UK’s 400 kV transmission network, which forms the backbone of the national grid.

Among the contractors, Laing O’Rourke secured positions across all three key workstreams—EPC delivery, mechanical and electrical installation, and major civil works—placing it in a strong position to deliver upcoming projects.

Other major firms involved in top-tier substation construction include BAM UK & Ireland, Costain, Siemens Energy, and Skanska, which are expected to compete for turnkey projects typically valued above £20 million.

The framework is intended to accelerate delivery of critical substation infrastructure, enabling faster connection of renewable energy sources, improving grid reliability, and increasing transmission capacity.

Substations are a key component of the UK’s power system, allowing electricity to be transformed between voltage levels and efficiently distributed across regions. As demand grows due to electrification, data centres, and renewable integration, investment in substation infrastructure has become a central priority.

The programme forms part of a wider effort to expand and modernise the UK’s transmission network, ensuring it can handle increasing volumes of renewable generation and support long-term decarbonisation goals.

By establishing a flexible contractor framework, National Grid aims to streamline project delivery and address supply chain constraints that have previously slowed the rollout of large-scale grid infrastructure

Source: megaproject.com