Black background with gold and white curved lines pattern on the right side.
Industrial piping system with multiple pipes and valves mounted on the concrete walls outside a building with an open hatch with a green valve. Work done by Stewart Electrical at Te Mārua Dissolved Air Flotation Plant.

Powering Kiwi Infrastructure

Specialists in Industrial & Water Infrastructure

Stewart Electrical partners with councils, consultants and principal contractors to deliver electrical services for water and wastewater infrastructure across New Zealand.

Our work includes treatment plants, pump stations, instrumentation, upgrades and maintenance. Every project is delivered with technical expertise, careful planning and workmanship that stands the test of time.

Industrial equipment with various electrical cords and pipes incased within the metal structure surrounded by pipes at Te Mārua Dissolved Air Flotation Plant installed by Stewart Electrical.
Industrial equipment with various electrical cords and pipes incased within the metal structure surrounded by pipes at Te Mārua Dissolved Air Flotation Plant installed by Stewart Electrical.

Trusted
by Industry

Years combined family experience within the industry

Years specialising in water and wastewater infrastructure

Building on industry experience dating back to 1974, Stewart Electrical delivers electrical solutions for critical infrastructure.

Our team has extensive experience working within live operational treatment plants and complex industrial environments. Careful planning, clear communication and technical expertise underpin every project.

Key clients include:

  • Tiaki Wai

  • HEB Construction

  • Fulton Hogan

  • Veolia

  • AFI

Electrical
Expertise

Learn more

  • This is the core of our business. We deliver specialist industrial electrical services for treatment plants, pump stations and associated infrastructure, including new installations, upgrades, maintenance and instrumentation.

  • We also provide industrial electrical services across manufacturing, processing and other industrial facilities, applying the same technical expertise and quality workmanship to every project.

  • Alongside our industrial work, we undertake selected commercial projects. We also undertake selected residential work for long-standing clients and referrals.

Why Stewart Electrical

 

Industry Knowledge

With decades of experience in the water and wastewater industry, we understand the technical and operational challenges unique to critical infrastructure.

Quality Workmanship

We have a reputation for delivering work to the highest standard. Our fastidious attention to detail that ensures every installation is completed safely, neatly, and built to last.

Trusted Relationships

Long-standing partnerships with councils, consultants, and contractors are built on clear communication, responsiveness, dependable delivery and consistent results.

Fair & Transparent

Practical advice, realistic pricing, and commitment to delivering the right solution rather than simply the biggest quote.

Featured Projects

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Industrial equipment worked on by Stewart Electrical at the Te Mārua Dissolved Air Flotation Plant showcasing a metal structure above the water.

Te mĀrua dissolved air flotation plant

A tall green industrial silo with a ladder and safety railing on top located at Te Mārua in Wellington. Nearby are pipes, storage containers, and metal control panels. The sky is cloudy with some blue visible, and trees can be seen in the background.

Te mĀrua optimisation project

Stewart Electrical completed actuator replacement works for Te Mārua and Waterloo Water Treatment Plants shown here in an underground water pipeline system with large pipes, valves, and ladders in an enclosed concrete chamber.

actuator renewal programme