Capabilities

Stewart Electrical delivers industrial electrical services across the Greater Wellington Region, with specialist expertise in water and wastewater infrastructure.

For more than 20 years, we’ve partnered with councils, consultants, engineers and principal contractors to install, upgrade and maintain the electrical systems behind essential public infrastructure.

From electrical installation to live plant upgrades and ongoing maintenance, we deliver work that stands the test of time.

Industrial Electrical

Pipes, encased electrical cords and conduit mounted on concrete walls of a building at Te Mārua Dissolved Air Flotation Plant, installed by Stewart Electrical.
Pipes, encased electrical cords and conduit mounted on concrete walls of a building at Te Mārua Dissolved Air Flotation Plant, installed by Stewart Electrical.

Industrial electrical projects demand more than technical capability.

They demand careful planning, clear communication and an understanding of how operational facilities function.

We work across manufacturing, processing and infrastructure environments, delivering electrical installations, upgrades and maintenance with minimal disruption to operations.

  • Electrical installations

  • Power distribution

  • Switchboards & MCCs

  • Motor control

  • Industrial maintenance

  • Plant upgrades

  • Fault finding

  • Preventative maintenance

  • Shutdown support

Water & Wastewater Infrastructure

A circular water clarifier at Te Mārua Drinking Water Treatment Plant, with a metal walkway leading to the center, surrounded by green hills.
A circular water clarifier at Te Mārua Drinking Water Treatment Plant, with a metal walkway leading to the center, surrounded by green hills.

This is the core of our business.

Our team delivers industrial electrical services for treatment plants, pump stations and associated infrastructure throughout New Zealand.

With more than two decades specialising in the sector, we understand the operational, safety and programming requirements that come with working on critical public assets.

  • Electrical Installations

  • Instrumentation & Control

  • Plant Upgrades & Renewals

  • Maintenance & Breakdown Support

Electrical Installations

We provide complete electrical installations for new facilities, plant expansions and infrastructure upgrades.

  • Power distribution

  • Cable containment

  • Cable installation & termination

  • Switchboards & MCCs

  • Motor installations

  • Field equipment

  • Plant commissioning

  • Electrical testing

  • VSD installations

Instrumentation & Control

Modern treatment plants rely on accurate monitoring and dependable control systems. We install, integrate and maintain instrumentation that gives operators confidence in the performance of their assets.

  • Process instrumentation

  • Sensors

  • Level monitoring

  • Flow monitoring

  • Pressure monitoring

  • PLC hardware integration

  • SCADA cabling infrastructure

  • Control panel wiring

 

Plant Upgrades & Renewals

We enable electrical infrastructure to evolve alongside the facilities it supports. This includes replacing ageing equipment, expanding electrical capacity and modernising existing installations. All within live operational environments while carefully staging work to minimise disruption.

  • Switchboard replacements

  • Electrical renewals

  • Equipment replacement

  • Capacity upgrades

  • Energy efficiency improvements

  • Plant modernisation

Maintenance & Breakdown Support

Well-planned maintenance extends asset life, reduces downtime and helps prevent unexpected failures.

We provide planned maintenance, preventative servicing, fault finding and responsive breakdown support across water and wastewater infrastructure, keeping critical assets operating safely and efficiently.

Commercial

Alongside our industrial work, we undertake selected commercial projects for long-standing clients and referral partners.

Whether it’s an office fit-out, a new build, or an electrical upgrade, every project is delivered with the same attention to detail and disciplined approach that defines our infrastructure work.