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Customer Feedback

We are keen to share our customers’ experiences with Preformed Windings to the public. We are a trusted and thought leader in the development of high-quality, high-voltage coils for various industries, and partnerships are at the heart of everything we do.

GE Vernova

“Preformed Windings have supplied many sets of high voltage coils to GE Vernova over the years. The quality of product and service is exceptional, and they are a trusted partner in our supply chain. We enjoy collaborative and cutting-edge research and development with Preformed Windings, which positions both organisations as thought leaders in the hydro industry. Their products offer significant benefits such as very low partial discharge and a long service life” – Global Commodity Leader

Andritz Hydro

“Preformed coils have successfully passed a rigorous set of qualification testing for Andritz Hydro. These tests included thermal cycling and voltage endurance to IEEE standards. We have had success using their coils.” – Principal Engineer

Westinghouse Nuclear

“Preformed have provided multiple sets to us for the project we’re currently working on. The latest set was ordered right at the onset of the Covid-19 shut down, which created obstacles that no one would have anticipated a year ago. Preformed did an admirable job working with us and shuffling resources to provide our coil set on time and with their usual excellent level of quality.”

Sidewinders LLC

“Sidewinders LLC has used Preformed Windings for many years, and they are our preferred winding provider. Preformed Windings supplies exceptionally high quality HV diamond coils for hydrogenerators, along with 24/7 technical support. Preformed Windings’ engineers listen to each client’s needs and study the specific requirements of each project to provide precisely tailored solutions. Preformed Windings uses their position as trusted thought leaders in the industry to not simply manufacture replacement coils, but to substantially improve coil designs. Preformed Windings’ process and focus on continuous improvement results in superior machine performance that will endure for many years to come.” – President and technical director

Siemens Industrial

“I would like to thank James Stevens for his reliable and professional performance including his timely feedback and answering any query on time.” – Head of customer service

Koontz Wagner Services

“Preformed Windings’ coils are the highest quality produced. I have tried other manufactures of High Voltage Coils. No one can compare to the speed, performance and quality of Preformed’s coils. Every part of my experience with the team has been top shelf.” – Operations manager


“The QC process is very effective resulting in zero rejects during a recent 468 slot rewind. The communication, technical support and order updates are very beneficial and make doing business across time zones transparent.” – General Manager

MARC (Thailand) Co. Ltd

“Preformed Windings make excellent quality coils, but just as important they offer strong technical and service support 24 hours a day which we value due to the time zone difference. They manufacture coils extremely quickly and are honest with the lead time they offer. We would highly recommend Preformed Windings.” – Managing Director

Renown Electric Motors and Repair Inc.

“It is a pleasure working with the Preformed Windings team right from the design phase to delivery and then onto the installation of a high-quality set of coils. With market-leading experience, their support helps us offer the very best product to our end customers.” – Engineering Manager


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