Built to perform. Engineered to last.
Obsessed with Quality.
Extending Asset Life. Improving Reliability.
We manufacture high-voltage bars and coils that extend the service life of generators and motors across hydro, nuclear, oil & gas, and industrial sectors — helping you protect critical assets and maximise uptime.
Quality
Engineered for continuous duty. Quality that protects your assets.
Our bars and coils are manufactured to the highest standards and tested to the same protocols as OEM originals. When a machine runs 24/7, the winding inside it must too.
Sustainability
Enabling the energy transition
Every bar and coil we manufacture supports a cleaner, more resilient grid. From generators to synchronous condensers, our components help you reach your clean-energy goals.
Partnerships
Enabling your success
Preformed Windings is purely a product manufacturer: we complement your business, we never compete with your services. Whether you are an OEM, a motor rewind shop, or an asset owner, our manufacturing capacity and R&D are dedicated to your success.
50+
Years Extending Asset Life
2x
AEMT Supplier of the Year
Up to 10yr
Warranty
24/7/365
Emergency Response
Products
The Windings at the Heart of Your Critical Assets
From precision-engineered coils to complete rewind kits and expert design services, every solution is built to extend the operational life of your rotating machines and reduce the total cost of ownership.
High Voltage Bars
Engineered for decades of dependable service. 6kV to 26kV Roebel bars with resin-rich or VPI-ready insulation, backed by an up to 10-year warranty.
Learn moreHigh Voltage Coils
Engineered for decades of dependable service. 6kV to 26kV diamond coils with resin-rich or VPI-ready insulation, backed by an up to 10-year warranty.
Learn moreRewind Kits
Complete kits that minimise your rewind time and get critical machines back online faster. Drop-in compatibility, zero guesswork.
Learn moreDesign & Engineering
Coil redesign, efficiency upgrades, and expert consultation that extend asset life and improve machine performance. Emergency response when you need it most.
Learn moreThe Preformed Difference
Why Energy Leaders Choose Us as Their Partner
Our obsession with quality runs through everything we do — from the materials we source to the final test before dispatch.
Reliability You Can Count On
Trusted by OEMs as if it were their own. Tested to IEEE standards for Voltage Endurance and Thermal Cycling by independent third-party labs, our industry-leading Ultra-Low partial discharge and tan delta levels mean lower failure risk and longer intervals between maintenance outages.
Minimise Your Downtime
When a critical machine fails, every hour offline costs thousands. Our emergency lead times are measured in weeks, not months — getting your infrastructure back to full capacity faster than anyone else.
A True Extension of Your Team
Our technical experts work closely with your team, from taking product dimensions to providing manufacturing and process advice. Complimentary bar and coil design consultation and 24/7/365 technical support — because your uptime is our mission.
Extend Asset Life, Reduce Total Cost
Our redesign and upgrade capability goes beyond like-for-like replacement. We improve efficiency, lower operating temperatures, increase generator output, and extend the service life of your rotating machines — delivering measurable savings over the lifetime of your asset.
What Our Partners Say
Trusted by service shops, OEMs, and operators
A selection of comments from the people we work with most closely. Logos available on request.
“Whether it's b-stage or VPI coils, impossible lead times, or a challenging specification, Preformed has been a true partner that allows us to meet our clients' needs through a shared commitment to providing the highest quality product.”
Justin Hatfield
President, HECO
“Preformed Windings uses their position as trusted thought leaders to not simply manufacture replacement coils, but to substantially improve coil designs — resulting in superior machine performance that will endure for many years to come.”
Glen Peterkin
President & Technical Director, Sidewinders LLC (Hydro)
“The quality of product and service is exceptional — a trusted partner in our supply chain. Their products offer significant benefits such as very low partial discharge and a long service life.”
Ravi Delalande
Strategic Sourcing Leader, GE Vernova (Hydro)
Quality That Protects Your Investment
Every bar and coil we manufacture is an investment in the long-term reliability of your infrastructure. Over 50 years of continuous improvement in materials, processes, and testing ensures that our products deliver decades of dependable, uninterrupted service.
- Every coil tested before dispatch — protecting your asset from day one
- Industry-leading Ultra-Low partial discharge and tan delta levels for longer service life
- Tight geometrical tolerances that reduce installation time and risk
- Uniform coils that lower winding complexity and speed up your rewind
- Redesign service that improves efficiency and reduces operating temperatures
- Up to 10-year warranty — our Quality is your protection
Where We Make an Impact
Improving Reliability Across Global Energy Infrastructure
From hydroelectric dams to nuclear plants, from offshore platforms to marine environments — wherever critical machines must run, our products help our partners keep them running longer and more reliably.
Hydro
Keeping hydroelectric generators running reliably for decades with custom-manufactured stator and rotor bars and coils.
Nuclear
Manufacturing bars and coils that meet the highest safety and reliability standards for critical nuclear power generation assets.
Oil & Gas
Manufacturing bars and coils that reduce unplanned downtime in harsh extraction and processing environments.
Industrial
Extending generator and motor life in manufacturing, mining, and heavy industry with bars and coils built to protect your capital investment.
Marine & Port Operations
Extending generator and motor life in marine environments and port infrastructure with bars and coils built to protect your capital investment.
Power Generation
Bars and coils built for high-voltage generators across thermal, gas, and renewable generation fleets worldwide.
Gallery
Inside Preformed Windings
A look at our products, facilities, and team from our LinkedIn and behind the scenes at our Rotherham, UK, manufacturing operations.
Protect Your Most Critical Assets
Whether you need emergency bar and coil supply or a long-term reliability partner, our engineering team is ready to help you extend asset life and reduce risk.
Find Us
Rotherham, South Yorkshire
Unit C, Vector 31 Industrial Estate,
Waleswood Way, Rotherham, S26 5NU,
England, UK