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High & Low Voltage · Engineering · Testing · Commissioning

Powering critical infrastructure with precision and reliability.

Hertz Engineering & Services is a trusted provider of high and low voltage engineering, testing, commissioning, and maintenance solutions for the offshore energy, mining, utilities, and industrial sectors worldwide. With more than 15 years of experience, our engineers deliver reliable, high-quality solutions for complex projects in the world's most demanding environments.

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Engineered to
IECIEEEAS/NZSNEK 400
0+
Years of international
engineering experience
0
Core service lines across
the asset lifecycle
24/7
Rapid mobilisation &
shutdown support
AU·EU
Operating hubs, with global
project deployment
Capabilities

Full-lifecycle electrical engineering, from Factory testing to energisation.

One accountable partner across testing, commissioning, maintenance and consultancy — so your asset reaches handover safely, on time and to standard.

Engineer performing high voltage withstand testing on switchgear in a substation

High Voltage Testing

HV withstand, partial discharge, VLF and tan-delta diagnostics on cables, switchgear and apparatus up to transmission class.

Partial DischargeVLFTan DeltaHV Withstand
Technician testing a low voltage distribution panel with a multimeter

Low Voltage Testing

LV distribution, MCC, panel and earthing verification — insulation resistance, continuity, polarity and functional checks to AS/NZS & IEC.

Insulation ResistanceEarthingPolarity
Engineer running secondary injection on a numerical protection relay with a test set

Protection Relay Testing

Secondary injection, scheme verification and coordination studies for numerical and electromechanical protection across the network.

Secondary InjectionCoordination
Large power transformer being tested at an electrical substation at dusk

Transformer & Switchgear Testing

Ratio, winding resistance, SFRA, oil and contact-resistance testing on power transformers, GIS and air-insulated switchgear.

SFRARatioContact Resistance
Commissioning engineers reviewing test documentation in an electrical control room

Electrical Commissioning

End-to-end pre-comm, FAT, SAT, functional testing and energisation management with full QA/QC documentation and ITP control.

FATSATITPEnergisation
Electrical engineer reviewing single-line diagrams and design drawings at a workstation

Engineering Consultancy

Studies, design review, protection coordination, witness inspection and independent verification across the project lifecycle.

StudiesDesign reviewWitness
Maintenance crew in PPE working on industrial electrical equipment during a plant shutdown

Maintenance & Shutdowns

Preventive and corrective maintenance, planned shutdown support and turnaround execution that compresses downtime windows.

PreventiveCorrectiveTurnaround
Team of electrical engineers in hard hats and hi-vis on an industrial site

Skilled Manpower Supply

Commissioning engineers, test technicians and supervisors mobilised at short notice — vetted, certified and project-ready.

Commissioning EngineersTechnicians
Offshore wind farm and substation platform at sea under a clear sky

Offshore & Renewables

Offshore platform, wind and solar electrical services — from HV array commissioning to grid connection and energisation.

OffshoreWindSolarBESS
Sectors we serve

Trusted where power cannot fail.

From offshore platforms to data centres, we work in the environments where an electrical fault is measured in millions — and minutes.

01

Offshore Oil & Gas

Platform & FPSO electrical

02

Offshore Wind

Array & substation comm.

03

Mining & Resources

HV reticulation & shutdowns

04

Utilities & T&D

Transmission & distribution

05

Renewable Energy

Solar, wind & storage

06

Data Centres

Critical power & redundancy

07

Power Plants

Generation & auxiliaries

08

Industrial & Ports

Manufacturing, marine & water

Why Hertz

The assurance EPC contractors and asset owners build into their program.

We are engaged where the cost of getting it wrong is unacceptable. Here is what that buys you.

/ 01

Safety-first, always

A zero-harm culture with rigorous isolation, permit and risk controls. Safety is the precondition for every energisation we sign off, not an afterthought.

/ 02

Proven delivery

15+ years commissioning complex offshore and industrial assets on schedule, with experienced engineers from leading multinationals.

/ 03

Global standards

Work executed and documented to IEC, IEEE, AS/NZS and NEK — accepted by operators, regulators and insurers worldwide.

/ 04

Reduced downtime

Tight, well-rehearsed test program and shutdown planning that return your asset to service in the shortest defensible window.

/ 05

Flexible workforce

Scale a single specialist or a full commissioning team up and down with demand — no idle headcount on your books.

/ 06

Digital reporting & QA/QC

Structured, auditable test records and certificates delivered digitally — traceable evidence your asset was verified to standard.

How we work

A disciplined path to energisation.

Every project follows a controlled, documented sequence — so risk is retired stage by stage, not discovered at handover.

01

Factory (FAT)

Witness and verify equipment at the manufacturer before it ships.

02

Pre-commissioning (SAT)

Inspection, point-to-point and static testing once installed on site, then HV/LV, protection and functional testing against the approved ITP.

03

Energisation

Controlled energisation and live functional verification of the system.

04

Performance

Run the system for a defined period, monitoring performance and stability ahead of handover.

05

Handover

Certified records, as-tested documentation and defect-free turnover.

Project snapshot

Representative work.

OFFSHORE WINDNORTH SEA, NOHV COMMISSIONING

110 kV offshore substation commissioning & energisation

Our engineers led HV testing, protection scheme verification and controlled energisation of an offshore collector substation — coordinating with the EPC, grid operator and marine teams to hit a fixed weather window.

110 kV
System voltage commissioned
0
Safety incidents
100%
First-pass energisation
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Have a testing, commissioning or engineering requirement?

Send us your scope and we'll respond with a qualified team, program and quotation. Headquartered in India, with engineers deploying worldwide.

Request a quote contact@hertz-es.com
Contact us

Talk to the team behind the energisation.

Head office in Chennai, India, with engineers deploying globally. Send us your scope, or reach us directly.

General enquiries +91 87545 30042
contact@hertz-es.com
HEAD OFFICE · INDIA
Plot No. 31, V.M Garden, Royappa Nagar,
Varadharajapuram, Kanchipuram,
Chennai 600048, Tamil Nadu
AUSTRALIA
Perth WA · Representative office
EUROPE
Stavanger, Norway
Representative office
Call us directly +91 87545 30042

For RFQs, rapid mobilisation and technical enquiries — connected straight to our engineering team.

Write to us contact@hertz-es.com

Send your scope of work and we'll respond with a qualified team, program and quotation.

24/7 mobilisationResponse within 24 hrsDocumented QA/QC
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