Ramboll statement on the publication of its research report by DESNZ

  Posted by: electime      15th June 2026

Statement on the findings of survey, “Undergrounding transmission cables: study of costs of innovative methods”

“Delivering the grid infrastructure required to support the UK’s clean energy transition is one of the biggest infrastructure challenges of the next decade. As we accelerate the connection of renewable energy and increase electricity demand, it is critical that we explore every opportunity to deliver infrastructure more efficiently, affordably and sustainably.

“Following our appointment by the UK Government to undertake this study, our analysis shows there are significant opportunities to reduce the cost of undergrounding electricity transmission infrastructure through innovation and alternative construction methods.

“Our findings show that cable ploughing could reduce the overall cost of underground cable projects by between 20 and 40 per cent compared with traditional cut-and-cover methods, depending on project-specific factors. The civil engineering element alone could see cost reductions of up to 66 to 72 per cent.

“While cable materials remain a significant proportion of overall project costs, this research provides important evidence to help policymakers, network operators and industry make more informed decisions about when and how undergrounding can be delivered.

“Looking ahead, further innovation, including new cable technologies such as graphene-enhanced conductors and advances in converter station design, has the potential to drive further efficiencies.

“The scale of investment required in our electricity networks means we must challenge traditional approaches and embrace innovation. This study demonstrates that undergrounding transmission infrastructure can be delivered more cost-effectively, supporting the development of a resilient energy system for the future.”