Alpha Construction Ltd

01283 733688

info@alphaconstruction.co.uk

a

Norwich Main

Construction of foundation & cable infrastructure for a 400kV AIS substation

Client : Hitachi Energy

End User : National Grid

Location : Norfolk

Contract Value : £1.9m

Project complexities, simplified by Alpha:

  1. Working within an operational substation extension environment, requiring safe systems of work and careful sequencing to manage proximity to high-voltage infrastructure.
  2. Coordinating closely with Hitachi Energy as Principal Contractor, ensuring alignment with electrical installation works and maintaining programme efficiency.
  3. Integrating new ducting, troughing and foundation systems with existing infrastructure, requiring precision and coordination to maintain network continuity.
  4. Managing multiple ducting and containment systems across the compound, ensuring efficient cable routing and long-term maintainability.

Scope of Works:

  • Preparation of site including removal and reinstatement of chippings, enabling construction within the substation extension compound.
  • Construction of reinforced concrete foundation bases, including shuttering, reinforcement and cast-in holding down bolts for high-voltage equipment.
  • Construction of PRR container foundations, supporting relay and protection infrastructure.
  • Installation of ducting systems, including 150mm PVC ducts and multi-way duct systems, enabling cable routing across the compound.
  • Installation of drawpits and access chambers, including proprietary systems to support maintainability and cable management.
  • Installation of precast concrete cable troughs, providing robust and accessible cable containment.
  • Connection of new ducting and trough systems to existing infrastructure, ensuring seamless integration with the operational substation.
  • Excavation and off-site disposal of surplus materials, followed by reinstatement of gravel and chippings to complete the compound.

Ready to Build with Confidence?

Let’s shape a smarter, safer, more efficient solution, together.

Related Case Studies

Padiham

Padiham

Design & construction of a new GIS Substation.

View Case Study
Burwell

Burwell

Substation extension & upgrade

View Case Study
Blyth

Blyth

Construction of a new high voltage substation

View Case Study
Wymondley

Wymondley

Construction of a GIS building & transformer infrastructure within a live substation

View Case Study
Fryston Lane

Fryston Lane

Construction of a new 132kV substation

View Case Study
Alpha Construction Ltd

Why Alpha Construction Ltd?

We support clients from the earliest stages of a project to help shape practical, buildable solutions before work starts on site.

Adding Value Early

Adding Value Early

Early Contractor Involvement allows us to contribute our delivery experience during the design and planning stages, helping test options against real site conditions and reduce the risk of later change

Trusted Delivery Teams

Trusted Delivery Teams

Our directly employed teams provide continuity, accountability and practical site experience throughout delivery, supporting consistent standards of safety, quality and programme management.

Proven in High-Risk Environments

We regularly deliver projects in live, complex and highly regulated environments where safety, planning and coordination are critical. This experience allows us to manage risk effectively and maintain control of programme and quality, even when conditions are challenging.

Framework & Public Sector Ready

Our processes and reporting are aligned with framework and public sector requirements, supporting strong governance, transparency and compliant delivery throughout the life of a project.

Transparent, Competitive Pricing

Transparent, Competitive Pricing

We provide clear, considered pricing supported by open communication around scope, risk and delivery requirements. This helps clients make informed decisions and maintain greater visibility over costs throughout the project.

Relationship-Driven Delivery

Relationship-Driven Delivery

We work collaboratively with clients, designers and stakeholders to build long-term working relationships based on trust, communication and consistent delivery. This results in smoother projects, quicker resolution of issues, and stronger outcomes over time.

Ready to Build with Confidence?

Let’s shape a smarter, safer, more efficient solution, together.