Tier 1 Transformers Stock Availability

We have stopped manufacturing Wilson e1 transformers in light of the new Tier 2 EU Ecodesign regulation. However, we still have Tier 1 transformers in stock that are available for sale and they are good for budget-sensitive projects.

Following the EU Ecodesign regulation, our stock of Wilson e1 transformers has already been placed in the market and can be sold and installed even after 1st July 2021. Please note that we have a limited stock availability so these transformers will be sold on a first come first served basis. If you have projects in the pipeline, we might have to offer you Tier 2 alternatives once the stock is depleted.

Wilson e1 transformers in stock are Tier 1 compliant, liquid-filled (ONAN or KNAN) distribution transformers available in the following ratings and voltages on 8-week lead time with some ratings available ex-works:


Voltage ratio 11kV/415V
Voltage ratio 33kV/400-400V


These transformers are offered on a six-week lead time and come with the following specifications:
• HV off load tap changer with additional tap setting (+/-2.5%, +/-5.0%, +7.5%)
• Bottom entry HV cable box suitable for 1 x 3c cable
• LV cable box suitable for multiple x 1c cable options depending on the rating

All additional accessories are available such as Oil Temperature Indicator (OTI), Winding Temperature Indicator (WTI), Magnetic Oil Gauge, Pressure Relief Device (PRD), Bunds, Conservator and Buchholz Relay.

Movie 23 Apr 2021

Europe’s Joint-Largest BESS energised in Buckinghamshire

A significant step towards securing our energy future and meeting the UK’s landmark commitment to decarbonise electrical systems by 2035 was taken this month by the successful energisation of Bumpers, the joint-largest Battery Energy Storage System in Europe by MWh. Developed by Harmony Energy, the site utilises fifty-six Tesla Lithium-Ion 2XL Megapacks, connected to twenty-eight […]

Movie 24 Oct 2023

Energising the UK’s First Transmission-Connected Solar Farm

Photo credit: Alexander Parkyn-Smith The UK’s first solar farm to connect to a transmission network instead of a distribution network has been energised by the National Grid in the beginning of May 2023. Larks Green is located in Bristol and is connected to Iron Acton substation through a Wilson Power Solutions transformer.   The 49.9MWp […]

Movie 16 May 2023

IETF: Industrial Energy Transformation Fund FAQ

The Industrial Energy Transformation Fund (IETF) was designed by the UK government to encourage energy-intensive businesses to cut their carbon emissions and reduce their energy waste by switching to energy-efficient low-carbon technologies. A budget of £315 million was allocated by the government to be spent through the IETF. BEIS manages England, Wales and North Ireland’s […]

Movie 4 Apr 2022

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