Top 12 High Voltage Power Transformer Suppliers in UK

When it comes to large-scale energy projects, finding reliable high voltage power transformer suppliers in UK is essential for ensuring efficiency, safety, and long-term performance. The UK energy infrastructure relies heavily on trusted transformer manufacturers and suppliers that meet the rigorous standards of the National Grid, renewable energy projects, and industrial power systems.

High voltage transformers play a critical role in power transmission and distribution. They step up the voltage for long-distance transmission and step it down for safe distribution to homes and industries. The suppliers in the UK not only manufacture and supply transformers but also provide services like testing, installation, maintenance, and after-sales support.

In this detailed guide, we will explore the top 12 high voltage power transformer suppliers in UK, their specialties, product ranges, and why they are trusted by leading utilities and EPC contractors. Whether you are working on grid substations, industrial plants, or renewable energy systems, this guide will help you choose the right partner for your next project.

Key Takeaways

• The UK has several globally recognized manufacturers offering transformers from 11kV to 400kV and beyond.
• These suppliers cater to utilities, renewable energy, and heavy industry applications.
• Many suppliers offer complete EPC, design, and service solutions along with transformer manufacturing.
• Choosing the right supplier depends on technical capability, lead time, and after-sales support.

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1. Siemens Energy UK

Siemens Energy is one of the most trusted names among high voltage power transformer suppliers in UK. The company manufactures a wide range of power transformers for transmission and distribution networks, covering ratings from 33kV up to 800kV.

Siemens operates its transformer manufacturing and service centers in Lincoln and Newcastle. The company’s transformers are known for their reliability, compact design, and efficient cooling systems. Siemens also focuses on sustainable manufacturing practices with low-loss core designs and biodegradable insulating fluids.

Specialties:

• Large power transformers (up to 1000 MVA)
• Grid and renewable integration solutions
• Advanced monitoring with digital sensors

2. ABB (Hitachi Energy UK)

ABB, now operating under Hitachi Energy, remains a global leader in transformer technology. As one of the top high voltage power transformer suppliers in UK, Hitachi Energy offers reliable and energy-efficient transformers for various industrial and utility applications.

Their UK operations support power utilities and renewable developers with complete lifecycle solutions — from transformer design to digital maintenance systems. ABB transformers are used extensively in offshore wind projects and grid substations across the UK.

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Key Products:

• Generator step-up transformers
• Grid and substation transformers
• Smart monitoring and digital twins

3. Wilson Power Solutions

Leeds-based Wilson Power Solutions is a prominent UK manufacturer specializing in high voltage and distribution transformers. They are known for their “Wilson e3 Ultra Low Loss Transformer” series, which provides exceptional energy savings and meets EcoDesign Tier 2 efficiency standards.

Their transformers range from 11kV to 132kV, catering to commercial, industrial, and renewable applications. Wilson Power Solutions also offers custom-built transformers designed to meet site-specific requirements.

Highlights:

• 100% UK manufacturing
• Environmentally friendly designs
• Fast delivery and responsive after-sales service

4. Brush Transformers (British Electrical Group)

Brush Transformers, based in Loughborough, is one of the oldest high voltage power transformer suppliers in UK, with over 130 years of manufacturing experience. The company designs and produces transformers up to 275kV for grid, generation, and industrial applications.

Brush focuses on minimizing transformer losses and ensuring long operational life. Their transformers are widely used by National Grid and leading utility companies.

Key Offerings:

• Power transformers up to 275kV
• Transformer refurbishment and testing
• On-site installation and commissioning

5. Schneider Electric UK

Schneider Electric is a global leader in energy management and automation. In the UK, Schneider offers a wide portfolio of high voltage transformers, switchgear, and substation solutions. Their transformers meet IEC and BS EN standards, ensuring high safety and performance.

Schneider’s transformers are particularly popular for renewable power plants and smart grid systems where digital connectivity and real-time monitoring are crucial.

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Features:

• Compact design for urban installations
• Smart protection systems
• Custom-built solutions for utilities

6. Crompton Greaves Power (CG Power Systems UK)

CG Power Systems, part of the Avantha Group, is one of the well-known high voltage power transformer suppliers in UK, providing solutions for utilities and renewable sectors. Their UK division focuses on manufacturing and servicing transformers up to 400kV.

CG Power Systems emphasizes high-quality insulation systems and low-noise operation, making them ideal for industrial and residential environments.

Applications:

• Offshore wind farms
• Transmission substations
• Power generation plants

7. Alstom Grid (GE Power Transformers)

Alstom Grid, now a part of GE Renewable Energy, supplies high-voltage transformers and complete substation equipment. GE’s Stafford facility in the UK specializes in designing and manufacturing large power transformers, making it one of Europe’s largest transformer manufacturing centers.

Their products are deployed in high-demand areas such as interconnectors, grid substations, and renewable energy transmission lines.

Key Strengths:

• 275kV to 420kV power transformers
• Digital substation compatibility
• High efficiency and low failure rate

8. MIDEL (M&I Materials Ltd)

MIDEL is not a transformer manufacturer but plays a key role in the UK’s transformer supply chain. They produce world-leading biodegradable ester fluids used by high voltage power transformer suppliers in UK. Many major transformer brands use MIDEL fluids for insulation and fire safety.

This makes MIDEL an integral partner for sustainable transformer technology, supporting green energy initiatives and safe power system operation.

Specialization:

• Natural and synthetic ester fluids
• Fire-safe, eco-friendly insulation solutions
• Global supply partnerships with major transformer OEMs

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9. Winder Power Ltd

Winder Power, based in Leeds, designs and manufactures transformers up to 132kV. They serve both public utilities and private industrial clients across the UK and overseas.

Known for flexibility and customization, Winder Power delivers bespoke high voltage transformers with modern testing and design capabilities. Their in-house factory acceptance tests ensure the highest reliability standards.

Advantages:

• Custom transformer solutions
• Fast turnaround for urgent projects
• On-site installation and servicing

10. SGB-SMIT Group UK

SGB-SMIT is one of Europe’s largest transformer manufacturers, and its UK division offers a range of high voltage transformers from 33kV up to 420kV. The company provides tailor-made solutions for grid, renewable, and industrial sectors.

Their transformers are known for high mechanical strength, long life, and superior insulation. SGB-SMIT also provides advanced digital monitoring systems for condition-based maintenance.

11. TMC Transformers UK

TMC Transformers specializes in cast resin and dry-type transformers, serving both high and medium voltage applications. These transformers are used where safety and compact design are essential — such as hospitals, data centers, and underground substations.

While not the largest supplier in terms of voltage, TMC’s high reliability and low maintenance requirements make them a preferred choice for sensitive environments.

Product Focus:

• Dry-type high voltage transformers
• Compact and low-noise design
• High short-circuit strength

12. Powerstar (EMSc UK Ltd)

Powerstar is a Sheffield-based company offering voltage regulation and transformer solutions for energy efficiency. Their high voltage transformers come with integrated voltage optimization technology, which helps reduce power losses and carbon emissions.

Powerstar’s products are especially popular among commercial and industrial users looking to improve power quality and reduce operational costs.

Highlights:

• Smart voltage optimization
• Energy-saving transformer designs
• UK manufacturing and engineering support

Comparison Table: Top 12 High Voltage Power Transformer Suppliers in UK

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Why Choosing the Right Supplier Matters

Selecting the right transformer supplier can directly influence your project’s efficiency, safety, and ROI. Reliable suppliers not only deliver high-quality transformers but also provide after-sales support, testing, and digital monitoring solutions that reduce downtime and maintenance costs.

For critical infrastructure like transmission substations and renewable energy parks, suppliers with strong R&D, certified testing, and a UK-based service presence are vital. Choosing a supplier aligned with your project’s voltage class, delivery schedule, and sustainability goals ensures long-term operational success.

Final Thoughts

The UK transformer market combines world-class engineering expertise with a strong commitment to innovation and sustainability. Companies like Siemens, Hitachi Energy, and Wilson Power Solutions continue to set global benchmarks in transformer technology, supporting the nation’s transition to a smarter and greener grid.

Whether you need a large-scale grid transformer or a customized medium-voltage solution, the high voltage power transformer suppliers in UK listed here are proven partners for dependable and efficient power solutions.

To explore more about sourcing the right transformer solutions for your project, check out our guide on top power and distribution transformers suppliers — a complete resource for engineers, EPC firms, and project managers seeking trusted partners in the UK transformer market.

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