Projects

Pentir Substation For National Grid.

Overview

Location

Pentir

Value

£525k

Status

Ongoing

Client

The Challenge.

ACS is supporting National Grid on enabling works and the delivery of key civil infrastructure at Pentir Substation in North Wales. Initially engaged to undertake site and ground investigation works, ACS has played a pivotal early role in de-risking the scheme and informing the development of the main construction package.

Following successful early engagement, the scope has expanded to include the delivery of reinforced concrete infrastructure to support upcoming transformer installations.

Live substation environment, requiring strict compliance with operational constraints and safety procedures
Restricted access and remote location, impacting logistics and material movement
Programme certainty, driven by fixed transformer delivery dates
Developing ground conditions, requiring early investigation to inform design and mitigate delivery risk

ACS has been responsible for early-stage investigation and the development of the civils delivery package, including:

Site and ground investigation works to inform design and constructability
Reinforced concrete works to two transformer bunds and plinths
Associated drainage infrastructure and connections
Temporary works design to support safe construction delivery

Works are being undertaken within a live substation environment, requiring close coordination with National Grid teams and ongoing operations.

Our Solution.

ACS has adopted a proactive, early-contractor-involvement approach to add value from the outset:

Early engagement with National Grid, providing budget cost advice and constructability input to shape the emerging scope
Site investigation-led delivery, enabling risks to be identified and addressed at the earliest stage
Collaborative planning, working closely with National Grid planners, design teams and site management to develop a robust delivery strategy
Digital delivery tools, including FieldView, to support quality assurance, reporting and real-time site management
Flexible resourcing model, utilising experienced in-house teams and specialist formwork subcontractors

Outcomes & Progress

Successful early-stage engagement, leading to expansion of scope and increased contract value
De-risked delivery, with investigation works informing design, programme and cost certainty
Strong client collaboration, reinforcing ACS’s position as a trusted delivery partner to National Grid
Programme alignment, ensuring readiness for upcoming transformer installation phases

Social Value & Environmental Considerations

ACS is committed to delivering measurable social and environmental value, including:

Engagement of local supply chain partners where feasible
Responsible material management aligned with sustainability objectives
Environmental compliance within a live operational substation setting

Why This Project Stands Out.

Demonstrates ACS’s ability to add value at early project stages, shaping scope and improving deliverability
Reflects repeat business and direct award from National Grid based on proven performance
Showcases a flexible, scalable delivery model, transitioning from investigation to full civils package
Reinforces the strength of in-house expertise in substation infrastructure delivery

I would just like to say how pleased I am with the standard of the work going on, the work has progressed well. The site is clean and tidy with barriers, safe access and egress points, all plant had nappies under them and the site operatives we’re all conducting themselves professionally and were helpful in answering my questions. The excavation in the field was suitably shored, and the site was secure.Please pass on my praise to everybody.