HVSM Provide a specialist maintenance service with a team of highly trained engineers that ensures the longevity and a full lifecycle of all your High Voltage equipment.

Our HVSM engineers are trained and experienced to perform Routine Maintenance and Emergency Repair of all High Voltage equipment.

HVSM understand the importance of maintaining equipment in a safe, reliable, and fully functional state.

We offer the following Asset Management Services:

  • Develop a recurring maintenance program for clients.
  • Liaising with the relevant DNO’s/TSO’s for planning outages
  • Providing SAPs to prepare switching plans and execute switching operations.
  • Advising on remedial action arising from routine maintenance.


  • Partial Discharge
  • Oil analysis (DGA)
  • Circuit Breaker Analysing
  • CT/VT analysing
  • G10/EGIP
  • Cable Mapping
  • Tan delta
  • Sweep Frequency Response Analysis
  • OLTC Dynamic Scan

Our Partners

We proudly serve an array of esteemed clients, including industry-leading multinational corporations. Our unparalleled expertise and steadfast dedication have gained us trust across industries, reinforcing our commitment to deliver exceptional high voltage solutions.


HVSM has been operating since 1991 and is a wholly Irish owned and operated company. Since we were established we have built an excellent reputation for best in class specialist service in High Voltage Solutions.

Croke Park CJRL

Just a brief note to thank you and all the team in CJRL for an excellent job here on the Electrical Infrastructure upgrade.
From our point of view it has been a seamless piece of work, causing minimal delay to the operation of the Stadium during what is our busiest period of the year.Well done to all of you!

Roadstone Limited

HVSM Limited is an exceptional high and medium voltage electrical contractor. Their team is highly skilled, meticulous in their work, and always ensures that safety standards are met without compromise. We highly recommend their services to anyone in need of top quality HV / MV electrical contracting solutions.

Damien Smith, Electrical Manager