Substation Design & Build
Engineering, procurement and construction of AIS/GIS substations, including civil works, protection and control, and commissioning.
High-voltage substations • Data centre grid connections
Specialist HV Substation & Data Centre Delivery – Europe
Celtic Substation Services is an engineering-led contractor delivering turnkey electrical infrastructure, grid connections and mission-critical power systems for utilities and hyperscale data centres across Ireland, Sweden and wider Europe.
Core capabilities
Turnkey electrical infrastructure delivery
From concept design to energisation, Celtic Substation Services provides a complete delivery solution for HV substations, grid connections and data centre power systems.
Grid Connection Projects
110–400 kV grid connections for utilities and data centres, route selection, cable installation and interface management with TSOs/DSOs.
Data Centre Infrastructure
Incoming grid substations, MV distribution, backup generation interfaces and power systems for hyperscale data centre campuses.
Commissioning & Testing
Protection testing, functional commissioning, SAT/FAT, energisation support and handover documentation for complex HV assets.
About
Founded and managed by engineers
Celtic Substation Services brings together utility, contractor and data centre experience to deliver technically robust, programme-driven projects for clients who depend on resilient power infrastructure.
With roots in Ireland and operations extending into Sweden and wider Europe, our team combines HV substation expertise with mission-critical data centre delivery. We operate as an engineering-led contractor, focusing on safe, quality-assured construction and commissioning of complex electrical assets.
We work as a dedicated delivery partner for utilities, developers and hyperscale operators, integrating civil, electrical and control systems to deliver substations and grid connections ready for energisation.
Services
Engineering and delivery services
A grid/MEP-style service layout covering engineering, construction and commissioning for HV substations and data centre power systems.
HV Substation Engineering
Concept and detailed design for AIS and GIS substations from 33 kV to 400 kV.
- Single-line diagrams and protection philosophies
- Primary plant layout and equipment selection
- Earthing, insulation coordination and EMC studies
Turnkey Substation Construction
Complete EPC delivery of substations and grid interfaces.
- Civil and structural works
- Primary and secondary installation
- Interface with utilities and system operators
Grid Connection for Data Centres
End-to-end delivery of incoming grid supply and campus MV distribution.
- Grid connection substations and feeders
- MV switchgear, transformers and busduct
- Integration with backup generation and UPS
Testing & Energisation Support
Commissioning and handover for new or upgraded assets.
- Protection relay testing and settings verification
- Functional testing and SAT/FAT
- Energisation support and as-built documentation
Projects
Selected projects
A sample of recent grid, substation and data centre infrastructure projects delivered across Ireland, Sweden and wider Europe. These entries can be replaced with detailed case studies as the portfolio grows.
Dublin 110 kV Substation Upgrade
Design, construction and commissioning of a 110 kV AIS substation and grid connection to support urban network reinforcement.
Scope included primary plant replacement, new protection and control systems, civil works and phased energisation.
Hyperscale Campus Grid Connection
Turnkey delivery of incoming grid substation and MV distribution for a hyperscale data centre campus in Sweden.
Works included grid interface coordination, substation construction, MV cabling and commissioning of protection schemes.
Wind Farm Grid Connection
Engineering and delivery support for a 220 kV substation connecting a wind farm to the transmission network.
Scope covered HV design reviews, site supervision and commissioning of protection and control systems.
ESG / HSQE
Safety, quality and responsibility
Our projects are delivered within a structured HSQE framework, designed for substations and mission-critical data centre environments.
Health & Safety
- Safety-first culture embedded in all activities
- Permit-to-work and lock-out/tag-out procedures
- Task-specific risk assessments and method statements
- HV switching and access managed with utility partners
Quality
- Structured quality plans aligned with client standards
- Inspection and test plans for civil and electrical works
- Commissioning records and handover documentation
- Lessons-learned feedback into future projects
Environment
- Environmental management integrated into site activities
- Waste segregation and responsible material handling
- Minimising noise, visual impact and local disruption
Social Responsibility
- Local engagement and stakeholder communication
- Support for local supply chains and workforce development
- Ethical business practices and transparent reporting
News
Latest updates
Short updates on project awards, milestones and company announcements. These can be expanded into a full news or insights section over time.
Framework agreement secured
Celtic Substation Services has secured a framework position to support HV substation projects for a European utility client.
New data centre project in Sweden
Appointment as delivery partner for incoming grid infrastructure and MV distribution to a hyperscale data centre campus.
Investment in commissioning capability
Expansion of protection testing and commissioning resources to support complex energisation programmes.
Careers
Join a specialist delivery team
We offer opportunities for engineers, supervisors and commissioning specialists who want to work on substations, grid connections and mission-critical data centres.
Our projects combine technical depth with structured delivery, working closely with utility and hyperscale clients. We invest in training, certifications and project experience that build long-term careers in HV and data centre infrastructure.
To express interest, send your CV and a short introduction to careers@celticsubstationservices.ie.
Contact
Talk to our team
Use the form below to tell us about your project, or contact our offices directly in Ireland and Sweden.