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About Us

iST Power is a renowned transformer manufacturer engaged in the design, engineering, and manufacture of a wide range of transformers, reactors and other wound components up to 2MVA power rating and primary voltages up to 66kV. We are a market leader in the core markets we serve and supply solutions to a diverse range of markets and applications throughout the world.

Our History

International Transformers, was founded by Ernest Lee in the 1930s and became one of the main UK specialist manufacturers within the industry. With a world-wide range of well-known customers including the Ministry of Defence (MOD), British Aerospace, Alstom, UKAEA/BNFL, BP and others

Our Accreditations 

iST Power hold various system and industry certifications for Quality, Environment & Information Security such as: ISO9001, ISO14001, Risqs, Achilles & Cyber Essentials. These demonstrate our total commitment to quality whilst recognising our environmental and social responsibilities, thus reflecting our Mission: “First Class Product + First Rate Business = First Choice Supplier

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Connect With Our Team


We're here to help you with all your transformer and reactor needs. Whether you have a question, need technical support, or want to discuss a custom solution, our team of experts are ready to assist you.

Here When You Need Us

Our strength has been developed from the longevity and trust of our customers.​

Northern Ireland Electricity Networks

“IST has provided the right level of support to NIE throughout the current contract”

Verified Customer Feedback

“ IST provide an outstanding service to us which I am thankful for and find them very easy to work with and transparent”

Verified Customer Feedback

“IST Power has been a great partner. Excellent customer support and quality products”

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