London Power Tunnels 2 (LPT2) project achieves a significant milestone with the activation of the first 2.5km circuit, promising a robust electrical infrastructure for the capital.
- 32.5km of new tunnels have been constructed under London, forming a high-voltage 275kV network.
- The outdated cables from 1967, previously laid in shallow trenches, are being replaced by these modern, subterranean systems.
- LPT2 features innovative technology, such as SF6-free switchgear, enhancing safety and maintenance efficiency.
- National Grid and its partners celebrate the project as a testament to advanced engineering and a cleaner energy future.
The London Power Tunnels 2 (LPT2) project marked a pivotal achievement with the activation of its first 2.5km circuit, signalling a transformative approach to energy infrastructure beneath the capital. This £1 billion initiative, which spans 32.5km of new tunnels from Wimbledon to Crayford, is designed to support a high voltage 275kV network that embodies future-ready electricity supply solutions.
Constructed by the joint venture Hochtief-Murphy, the project involved complex engineering tasks over three years, from 2020 to 2023. The 3m diameter tunnels, burrowed deep using cutting-edge technology, lay at varying depths with the deepest point reaching 50m underground. This significant depth ensures minimal disruption to the bustling city above, a marked improvement from the outdated 1967 cables that were previously housed in shallow ground trenches.
Central to the LPT2 are innovations in accessibility and maintenance. Access shafts between 9m and 15m wide, fitted with headhouses, punctuate the tunnel’s path, enhancing both safety and operational efficiency. This infrastructure not only modernises London’s energy network but also reduces future disruptions during maintenance works.
One of the noteworthy elements of the project is the introduction of a new substation at Bengeworth Road, featuring SF6-free gas insulated switchgear technology. This technology represents a significant stride in reducing the environmental impact of energy transmission.
The opening ceremony of the first circuit was attended by Energy Minister Michael Shanks, who praised the project as an exemplar of British infrastructure excellence. He highlighted the project’s role in driving the UK towards a cleaner energy future while supporting local communities with skilled job opportunities.
Alice Delahunty, President of National Grid Electricity Transmission, expressed satisfaction with the milestone, emphasizing the collaborative efforts of the teams involved. She noted that although there’s much left to accomplish, the energisation of the circuit between Hurst and Crayford stands as a testament to the project’s success.
Raj Kundan, HMJV project director, acknowledged the energisation as a major milestone, celebrating the collective expertise and commitment of the team despite the complexities involved. This project is part of a broader strategy to enhance London’s electricity supply and ensure resilience against future challenges.
LPT2 follows the successful completion of the first phase in 2018, which involved 32km of tunnels in North London, including two substations. This ongoing development continues to demonstrate the dedication toward securing a sustainable energy infrastructure for London.
The London Power Tunnels 2 project represents a monumental step in securing the capital’s energy future through innovative engineering and collaboration.
