Specialists in the EPC design and construction of
high voltage ( 3.3 kV – 750 kV) grid connections.

Our Services

Harnessing our global experience with local expertise, from concept design, planning, through to project execution and beyond, H&MV is a brand you can trust to power your business wherever you require. 

Data Centres

Across Ireland, the United Kingdom, Europe and Africa, H&MV are actively engaged in mission critical, hyperscale data centre projects.  We have expertise in GIS & AIS substation and grid route construction. 


Our extensive project portfolio is a testament to our market leading positioning as an EPC contractor.  H&MV expert crews are involved in wind farm, solar & battery storage development around the world.   Our service offerings from concept design, planning, delivery & energisation provide our clients with confidence, knowing they are working with a brand they can trust.


H&MV are a leader in the utility sector with a proven track record of providing turnkey solutions to TSO and DNO clients. 

Our dedicated design teams, project management, installation and commissioning staff have vast experience in the design and build of substations up to 400 kV. 

We turn concepts into realities, with our high voltage expertise and experience providing clients with assurance they can rely on. 

EV Chargers

H&MV provide turnkey solutions for Electric Vehicle Charging Points.  We’re available to assist owners, developers and facilities managers to make a choice that specifically meets their needs.  Committed to successfully delivering on time, adhering to deadlines, we are at hand to deploy our crews to busy urban areas and ensure minimal invasion and intrusion. 

Contact our local team for more information.

& Design

At H&MV Engineering our design engineering team are at the forefront in pioneer engineering solutions.
Our portfolio of services includes and is not limited to:

Feasibility Studies & Planning

Tailored to client specific needs, from cost assessment, site and equipment analysis, our detailed inspection and evaluation will assist clients in reaching an informed decision.

With our technical expertise, we can confidently assess the condition of your HV network requirements.

We can develop and deliver studies with solid content on environmental impact, grid connection methodology, sizing and different configuration arrangements.

Site Investigation

Site investigations and surveys will include high level detail on:

  • underground cable routes,
  • planning permissions,
  • substation evaluations,
  • hydrographic and topographic surveys

and more.

Design & Specification

We provide detailed design of substations from our extensive history of engineering solution delivery over the years in T&D systems.

HV cabling, SCADA Systems, earthing, bonding, substation layouts, 3D Modelling all benefit from our expertise that we offer in design solutions to the client.

Studies & Planning

Our Engineers are collaboratively working together to provide solutions and develop the array of services we deliver.

Our library of services is extensive:

  • load forecasting models,
  • network master plans,
  • transient stability studies,
  • load flow,
  • contingency analysis,
  • single and three phase short circuit studies
  • dynamic and transient stability studies,
  • insulation co-ordination studies,
  • voltage regulation,
  • reactive compensation,
  • 3D Modelling,
  • development of network planning and security standards.

Civil Design

Our design hub offers clients complete Civil Design solutions for substation and grid route design.

We have inhouse BIM and AutoCad experts ready to populate civil work packages/drawings in line with planning requirements.

State of the Art Test Equipment
  • Omicron CMC 356 x 3
  • Omicron CPC 100 and all accessories x 2
  • Omicron FRA
  • Omicron DIRANAHV testing equipment
  • Programma Sverker 650 x 5
  • Programma Primary injection kit 600A x 5
  • Programma Battery discharge kit
  • Programma Circuit breaker timing kit
  • Programma low ohm tester 200A
  • Megger 10kV Insulation resistance tester 10kV
  • Megger 5kV Insulation resistance tester x 15
  • Fluke dry well calibrator
  • Fluke mA simulators x 2
  • Buchholz test tool
  • AC pressure tester 72kV
    And much more


H&MV Engineering has established itself as a leader in turnkey Engineering, Procurement and Construction of Energy solution Projects (EPC).


Our Engineering Team is comprised of highly qualified, industry experienced professionals who utilise leading edge software and design.

Our engineering capabilities enable H&MV to provide innovative solutions to our clients worldwide.


Our dedicated team of Procurement Professionals operate with complete transparency in full recognition of regulations, legal compliance and client requirements. H&MV conducts its business with the highest levels of integrity.

Our extensive vendor database ensures that H&MV Engineering remains highly competitive in our global market. Our procurement team cater for each and every project requirement, whether it’s an off the shelf item or a highly specialised /engineered piece of equipment.

Our professionals provide guidance on equipment selection/evaluation, vendor auditing, FAT tests, bulk material supply, services, consumables, construction components, to name but a few.


At the core of H&MV Engineering is our dedication to safety, depicted by our Zero Accidents Culture.

With a project portfolio extending across green and brown field EPC HV projects worldwide, H&MV Engineering is renowned for its commitment to delivering projects on time, safely and in line with budgets.

Our construction crews have worked on projects in extreme weather conditions from the deserts of the Middle East to the sub-zero temperatures and artic conditions in the Nordic Region.

With employees who greet each new challenge with enthusiasm, the key to our success is our flexibility and adaptability.

HV Projects Case studies

Asset Management

Why do you need High Voltage Asset Management?

In most cases your HV Equipment and Systems are critical to your plants reliability because there is often no redundancy and the systems can be the single point of failure for your facility.

In order to maintain the equipment in a safe, reliable and functional state, regular predictive and preventive maintenance is required.

HV Maintenance can be divided into two categories – Non Intrusive and Intrusive:

Non Intrusive or predictive maintenance should be carried out while your plant is live and equipment is fully loaded and up to operational temperature.

Intrusive or preventive maintenance is carried out while the equipment is shutdown, isolated and locked out.

HV Non Intrusive Maintenance includes:

• Partial Discharge Testing – PD

• Equipment Visual Inspection

• Voltage, Amps & Temperature Readings

• Infrared Thermographic Imaging – TI

• Oil Sample Analysis

• Power Quality analysis

HV Intrusive Maintenance Includes:

• HV & LV Switchgear Inspection & Testing

• SF6 Switchgear gas handling equipment and leak detection, disposal and recycling

• Transformer Inspection & Testing

• Transformer Condition Assessment

• Tap Changer Maintenance

• Busbar Inspection

• Cable Termination Inspection

• Cable VLF & Partial Discharge

• Protection Relay Inspection & Testing


Please have a look at our information packs.

If you are interested in any of the services we provide, please do not hesitate to contact us to discuss your requirements.


CT & VT Services

H&MV Engineering offer the following Current Transformer (CT) and Voltage Transformer (VT) services.


Ultrasonic Partial Discharge Testing

Non-intrusive discharge monitoring is a very effective predictive maintenance test for MV motors, MV generators and MV switchgear as well as other electrical distribution equipment.


Protection Relay Services

We are capable of testing all protection relays from the old induction disc type to the modern multifunctional electronic relays.


Maintenance of low voltage circuit breakers

The deterioration of a low voltage circuit breaker is normal and this process begins as soon as the circuit breaker is installed. If deterioration is not checked, it can cause failures and malfunctions.


Dielectric Fluid Sampling & Analysis

H&MV Engineering takes oil samples to perform a Dissolved Gas Analysis (DGA) and an Oil Content and quality evaluation of a transformer and switchgear insulating fluids in accordance with specifications.


Transformer Condition Assessment

Testing to assess the health of power transformers and diagnose problems is of utmost importance to ensure the long term and safe operation of these very expensive power assets.


Cable Fault Locating

Although today’s power cable is designed for long life, failures can still be experienced. H&MV Engineering has taken cable fault locating from a hit or miss “art” to an exact “science.”


Thermal Imaging

Using Thermal Imaging we are able to rapidly test electrical systems for hot spots caused by loose connections or damaged and overloaded wiring before further damage is caused to your equipment.


Power Quality Analysis

Much of the electrical equipment in an industrial facility requires high-quality electricity; it will not tolerate sags, swells, transients, or harmonics, and it certainly will not tolerate power outages, no matter how short-lived.


Preventative Maintenance

It’s natural for electrical equipment to degrade over time, but it doesn’t necessarily have to fail. Preventive Maintenance Services from H&MV Engineering will evaluate the condition of your equipment and determine the most cost-effective and manageable solution to ensure its overall performance, safety and reliability.


Soil Resistivity & Earth testing

Effective earth grounding is essential for grounded AC and DC electrical equipment and distribution systems. Effective grounding provides the level of safety required to protect personnel and equipment from shock and fire hazard.


Circuit Breakers

HV Circuit Breakers (CB’s) are electrically operated switches designed to protect your electrical circuits from damage. Regular inspection and servicing is essential to ensure the reliability of your system and safe operation of the circuit breaker to protect your power systems.


Battery Testing

Battery banks provide an independent source for switchgear control, engine generator set starting, signal and communications systems, laboratory power, emergency lighting, and other applications. Batteries are the essential component of any Uninterruptible Power Supply (UPS).


HV Cable Partial Discharge Testing

Partial discharge mapping is a non-destructive
technique for condition monitoring,
assessment and commissioning
of high voltage cables.

Asset Management Case studies

Asset Management
Case studies

Training Academies

City & Guilds High Voltage Switching & Operations Course

High voltage systems require specific knowledge, expertise and competency to operate in a safe and competent manner.

H&MV Engineering have recognised that a significant gap exists in this area and we have put significant resources, experience and development into this course to address that shortfall.
This is the only one of its kind to be Accredited by City & Guilds in Ireland.

We offer full (5 days) and refresher (2 days) courses – contact us today for more details.

Training subjects

1. Principles of Electrical Safety

2. Lock-Out & Tag-Out (LOTO) & Testing of Isolations

3. Electrical Drawings and Switching Plans

4. Electrical Safety Legislation and Standards

5. Principles of Arc-Flash and Arc-Blast

6. Personal Protective Equipment (PPE) and High Voltage Test Equipment

7. High Voltage Switchgear and Transformers

8. General Electrical Theory and Concepts

9. Electrical Circuits and Protection

10. Principles of Risk Assessment

Who is it for?

The course is designed to be suitable for varied groups including:

• Facilities and Maintenance Managers

• Facility Engineers and Technicians

• High Voltage System Operators

• Plant Electricians

• Maintenance Technicians

It is recommended that candidates have 4 years of electrical experience.

For bookings please email training@hmveng.ie

What information do I need to book?
  • Company Details

– Company Name
– Company Address
– Company Contact Name
– Company Contact Number
– How did you hear about us?

  • Participants Details:

– Name
– Address
– Mobile Number
– Email Address
– Special Conditions eg. Learning difficulties, dietary requirements
– Position
– Number of Years of Electrical Experience
– Current Daily Duties in Position
– Qualifications
– Associated Courses
– High Voltage and/or Switching Experience

  • Credit Card Details
    (Alternative metods of payment can be arranged, please email us at hvtraining@hmveng.ie )