03 June 2025

Eclipse Power Networks has announced a significant contract with Colt Data Centre Services to develop and maintain grid connections totalling 250MW for its hyperscale data centre campus in Hayes, Middlesex. This contract follows a competitive tender process that began in late 2023 and concluded at the end of 2024, with Eclipse providing ongoing support throughout.

Under the agreement, Eclipse will adopt a 132kV dual-circuit connection from National Grid’s Uxbridge Moor substation, supplying 100 MW to the campus. Additionally, a 66kV dual-circuit connection from National Grid’s North Hyde substation will deliver a further 150MW. These connections will serve the campus’s five data halls, each independently metered via Eclipse’s network at 11kV.

“This critical infrastructure project highlights our technical expertise and ability to develop innovative, cost-effective solutions for mission-critical applications. Our collaborative and transparent approach helped Colt develop a unique commercial model that offers an innovative and equitable solution never before seen in Great Britain,” said David Swadling, Group Sales Director at Eclipse Power. “By owning and managing the grid infrastructure on Colt’s behalf, we ensure reliable power for the facility while allowing Colt to focus on delivering sustainable hyperscale data centre solutions.”

Eclipse’s selection was driven by its extensive experience with extra-high voltage (EHV) networks, deep understanding of National Grid processes, and a commitment to stakeholder transparency to optimize the commercial relationship.

“As the UK advances in the global digital economy, our Hayes campus requires scalable, secure power solutions with expansion potential. Colt partners only with organizations that share our commitment to mission-critical infrastructure. Eclipse’s innovative, collaborative approach and expertise in power networking make them the ideal partner for our growth at Hayes,” said David Knox, Global Director of Energy & Sustainability at Colt Data Centre Services.

With five floors and 175MW of IT capacity, Colt’s Hayes campus represents a major investment in data centre infrastructure. Energisation is scheduled for 2028, with Eclipse Power Networks designing infrastructure to last at least forty years.