HAYCO Hamad Ali Alyami Co.
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Power maintenance specialists · Eastern Province, KSA

We Overhaul
Energy
Across the Kingdom.

Two decades of testing, repairing, commissioning and refurbishing power transformers, substations, switchgear and circuit breakers — up to 380 kV / 315 MVA. Trusted by Saudi Electricity Company, Aramco, and Sadara.

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20+
Years of expertise
315MVA
Capacity handled
380kV
System voltage
3×ISO
Certified systems
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Trusted by

Capabilities · 01

What we overhaul.

All services
01

Power Transformers

Testing, repair and overhaul of distribution and power transformers from 11 kV to 380 kV — up to 315 MVA. Oil-immersed, dry-type, pole and pad mounted.

02

Circuit Breakers

Complete overhaul, repair and commissioning of 115 kV, 230 kV and 380 kV circuit breakers — mechanical, electrical and component-level service.

03

Switchgear & RMUs

MV / LV switchgear, smart and conventional ring main units, unit substations — testing, refurbishment and SF6 gas handling.

04

Oil Testing & Filtration

BDV, DGA, moisture, acidity, PCB. Vacuum filling, dehydration and on-site filtration to restore oil to operational health.

05

Testing & Commissioning

IEC 60076-compliant routine tests: winding resistance, TTR, IR/PI, vector group, no-load & load loss, SFRA, partial discharge.

06

Annual Maintenance

Comprehensive AMC contracts for complete substations — preventive inspection, priority response and 24/7 emergency support.

Operational scope

From distribution to EHV transmission.

Our engineers work confidently across the full spectrum of voltage classes deployed in Saudi Arabia's grid.

11kV Distribution
33kV Medium voltage
115kV Sub-transmission
230kV Transmission
380kV Extra-high voltage
SSA 421 SSA 422 IEC 60076 IEC 60296 IEC 60137 IEC 60354 IEC 60551 SEC General Reqs

02 / The company

A leader in primary &
secondary power.

Established~2003
HeadquartersDammam · Al Khobar
SectorUtility · Industrial · Commercial
SystemsISO 9001 · 14001 · 45001
Made in Saudi Vision 2030 24/7 Response

Hamad Ali Alyami Company For Maintenance is a technical service provider and a leader in primary & secondary power distribution solutions with over 20 years of experience.

We specialise in testing and repair of transformers, unit sub-stations, voltage switchgear, ring main units, circuit breakers and instrument transformers — for utility, industrial and commercial applications across Saudi Arabia.

We will repair your transformer, or any electrical asset, in the shortest possible time — with primary focus and commitment to customer satisfaction.

Standardisation of processes conforming to SSA 422, SSA 421, IEC 60076, IEC 60296, IEC 60551, IEC 60137, IEC 60354 and other standards allows us to guarantee deliveries before time. Our packing and shipping is done as per SEC general requirements.

Our method · 03

How we deliver.

01

Inspect

Trained engineers perform a thorough visual and physical inspection — at our facility or on site — generating a complete diagnostic report.

02

Recommend

Quality team reviews the report and prescribes the right path: repair, refurbishment, or selective replacement of components.

03

Overhaul

Skilled technicians execute the work — gaskets, windings, OLTC, bushings, SF6, oil filtration — to manufacturer specification.

04

Certify

Full IEC routine testing — TTR, IR, vector group, load loss, SFRA, partial discharge — and a signed report before recommissioning.

Compliance · 04

Audited. Accredited. Accountable.

ISO 9001:2015
Quality Management System for electrical equipment repair, transformers and circuit breakers.
SISTEMA · IAS2026
ISO 14001:2015
Environmental Management System covering all maintenance and refurbishment activities.
SISTEMA · IAS2026
ISO 45001:2018
Occupational Health & Safety Management — proactive prevention of workplace injury and risk.
SISTEMA · IAS2026
SEC Compliance
Packing, shipping and process standards aligned with Saudi Electricity Company general requirements.
SECActive
2030 Saudi Vision · Energy alignment

Powering the Kingdom's energy ambitions.

As Saudi Arabia diversifies its energy mix, modernises the grid and accelerates mega-projects — every megawatt depends on assets that work. We keep them working.

From substation refurbishment for the national utility to specialised testing for industrial giants, HAYCO is one of the partners quietly extending the operational life of the Kingdom's electrical backbone.

Got a transformer that won't wait?

Our diagnostic team responds within 24 hours. Send specs, photos, or a service history — we'll come back with a plan.

info@hamadalyami.com