Delivering the Celtic Interconnector with EirGrid

How do you expand the grid without compromising reliability and affordability?
The transition to cleaner energy depends on electricity networks that can do more, faster. Electrification, the explosive growth of data centres and the energy demands of AI are pushing electricity demand to new highs, while low-carbon generation is changing how power flows across the grid. Together, these shifts are putting unprecedented pressure on transmission and distribution systems – and the organisations that run them.
Across the globe, network operators are responding with new and upgraded infrastructure – stronger interconnections that move power where it's needed most, storage that stabilises variable generation, and smarter ways to manage demand.
We partner with clients to strengthen networks, unlock capacity and deliver projects and portfolios that support secure, resilient and lower-carbon energy systems.
Global reach and experience
We support onshore, offshore and cross-border projects with the scale to deliver anywhere in the world.
Integrated support
We bring together all the capabilities complex projects need – reducing handovers and strengthening oversight.
Commercial confidence
We protect your interests with strong cost control, innovative procurement and deep global market insight.
Making projects investible
We help shape clear strategies and compelling business cases that attract funding and secure approvals.
Supporting the transition to a smarter grid
We work across transmission and distribution projects and portfolios worldwide and have the scale and reach to mobilise quickly. Our teams bring together structured leadership, disciplined commercial solutions and practical advisory support to keep projects focused and performing.
We support onshore and offshore networks at every stage – guiding early planning and approvals, managing delivery and helping assets move confidently into operation. Whether the priority is grid upgrades, new connections, reinforcement programmes or interconnections, we help clients expand capacity while maintaining reliability and affordability.
The result is energy infrastructure that performs today and is ready for a lower-carbon, more electrified future.
“TenneT is committed to facilitating the Netherlands' ambitions for offshore wind. It has been a challenging year and Turner & Townsend has supported us in maintaining control and meeting the programme milestones for the critical infrastructure required to connect the Hollandse Kust Zuid wind farm to shore.”
Joris Engelen
Project Lead Platform, TenneT
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