About Us

Industrial-Scale Electrical, Automation & Engineering Servicing & Maintenance, delivered Across NZ.

For over 30 years, Hennessy Group has been the partner that New Zealand's most demanding industrial operations trust when the stakes are high and performance is non-negotiable.

From our Hamilton headquarters working across the Waikato and central North Island, to our Christchurch team serving the Canterbury region, we bring together more than 50 qualified electrical engineers, automation specialists, and project engineers delivering technically complex projects to international standard, on time and on spec.

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Hennessy team working on an electrical cabinet

Built on Results. Driven by Expertise.

Hennessy's reputation has been earned project by project, across some of New Zealand's most critical industrial environments. We work with the country's largest energy companies, food processors, and exporters. Organisations where unplanned downtime isn't just inconvenient, it's costly.

Our clients relationships built on consistent delivery, technical rigor, and a team that understands what's at stake.

National Reach. Local Presence.

Hennessy operates primarily across the Waikato, Bay of Plenty, and Central North Island.

We now have a growing South Island presence - headquartered in Christchurch - delivering service and maintenance contracts across Canterbury. With experience across the full range of key industrial sectors (including hydro and power generation, agri-processing, community utilities and infrastructure) if your operation is running critical plant in Christchurch or the Canterbury region, you now have a local Hennessy team to call on, with the depth and credentials to support it.

What Sets Hennessy Apart.

Industrial projects demand more than technical competence. They demand a service and maintenance partner who stays the course when problems get complex. Hennessy's culture is built around exactly that: tenacity, accountability, and a service model designed to keep your critical operations running 24 hours a day, 365 days a year.

At Hennessy, we don't just complete projects. We take ownership of core operational outcomes. Allow us to shape yours.

Hennessy’s CANTERBURY Expansion

Hennessy has launched its first dedicated Canterbury presence, based in Christchurch. It was a strategic move: after three decades establishing Hennessy as one of the North Island’s most trusted industrial electrical and automation partners, we are now bringing that same depth of capability to Canterbury’s key industries.

Our Canterbury team has strong hands-on industry experience and well-established relationships across the local business community. For procurement managers, project engineers and operations leads, this means a local Hennessy contact who understands the region.

Hennessy’s Canterbury focus is squarely on the sectors the company knows best: hydro and power generation, agri-processing, food and beverage, and heavy industrial. Our track record is a strong signal of what we can deliver in the region’s energy and infrastructure space.

Businesses across Christchurch and the wider Canterbury region are invited to get in touch with our Christchurch team to discuss their site servicing and maintenance requirements.

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OUR PEOPLE ARE THE CIRCUIT THAT POWERS INDUSTRY.

Simone told me about the excellent job that your team is doing there, so far we are on line with our ambitious schedule.

I think that would represent an absolute world record for the wiring operation for a 20 MN press.

Gabriele

Project Manager

Altus

Well done to all those involved in the design, fabrication, assembly and electrical construction of our machines. Not only have you delivered them on or before schedule, but you’ve also done it impressively. Thank you.

Kevin M. McCann

Superior Novelty Equipment, Inc. USA

Thank you for the level of service that your company provides. Your company has a good attitude, your staff act very professionally, providing good advice, being punctual and not to mention work completed is of a good standard and done in good time. There is also a good level of trust and I do appreciate the effort you all put in. Please relay my thanks to everyone and especially to Paul.

Marty Tissink

Maintenance Co-ordinator

Taylors Group Ltd

On behalf of the Dairy Goat Co-op, I wish to thank those people that battled on Tuesday afternoon into Wednesday and again on ANZAC day to help DGC with scoop inserter robots that had ceased working. Often work calls for us to step out beyond the normal hours and this is a huge inconvenience in our lives. I am very appreciative and again thank you for supporting us. I think we have resolved an issue that has perhaps been there for some time.

We are fortunate that we have good support companies (with very good people) supporting our operations.

Brent Prankerd

General Manager Manufacturing

Dairy Goat Co-operative (N.Z.) Ltd

Thanks for being so professional in working through all the issues that “popped” up from time to time. Having good Electrical and Instrument people like you guys makes a big difference to a job like this.

Don Watson

Don Watson Electrical Engineering Ltd

Please pass on our sincere thanks and appreciation to David Kinghorn for his professional advice and practical help on many occasions and more currently his exceptional assistance with both getting our Omet up and going and timely consideration in working on the Omega and with the supplier’s technician over the last week.

We have been privileged to have our electrical and electronic requirements met by Hennessy’s over a few years now and really do appreciate the level of service we are always afforded, to a man your team is pleasant, professional and always polite which you can be proud of, Labelmakers appreciates this very much and enjoys the relationship thank you.

Jody Cook

Technical & QA Manager

Labelmakers Ltd

It was a pleasure to experience Don and his guys working so well in extremely taxing conditions over the weekend. Outside was disgustingly unpleasant but your guys stuck to task and we are all up and running this morning – #1 goal achieved, fantastic.

Please pass my thanks onto the team.

Andrew Jaques

General Manager

Arborline Products Limited

Thanks heaps for sorting out the cables for the new CNC. The boys were awesome.

Elroy

Resco

Just wanted to acknowledge great consistent performance from Ian, Anthony & Tyrone over the last month.

Really good detail and accuracy coming through on the invoices and not to many surprises in the costs. Thanks to you all for pulling this together.

Guy Evans

Maintenance Manager

Dairy Goat Co-operative (NZ) Ltd

Yesterday we had a successful production start-up on the laminator Chop Knife. The Chop Knife has since been running well and all emergency stops, interlocks and guarding etc has been reviewed via a Machine hazard ID report. The project was well run with no major safety or hardware issues.

Thank you for the excellent way in which safety and work co-operation was conducted, the long hours worked and the on-time completion. We are now back to full production.

Tony Antoniadis

Facility Manager Specialty Boards, Oji Fibre Solutions