Sectors
DNO, iDNO & ICP

DNO, iDNO & ICP

Standardised designs to support iDNOs & ICPs

We supply UK DNO & iDNO approved ground mount unit type transformers on a short lead time utilising our large stock levels. The strategic partnership between Wilson Power Solutions and Toshiba and the framework agreements with DNOs and iDNOs allow us to provide transformers built following SSE, UKPN and SPEN specifications with more designs to be added. Moreover, our site team is trained to provide after-sales support to network competitive connection projects nationwide.

Independent Distribution Network Operators (iDNO) are licensed by Ofgem to develop, own and operate local distribution networks that connect to main distribution grids owned by Distribution Network Operators (DNO). These local networks can be housing developments, EV charging infrastructure, commercial areas, etc. which complement DNOs' work in expanding and maintaining distribution grids up to 132kV. Independent Connection Providers (ICP) are companies accredited by the National Electricity Registration Scheme (NERS), administered by LRQA Limited, and carry out the design, build and management of electrical networks adopted by DNOs or iDNOs. Both iDNOs and ICPs have to comply with DNO standards for infrastructure equipment specifications, including transformers.

Ageing infrastructure, the integration of renewables, and electrification of heat and transport are some of the challenges DNOs, iDNOs and ICPs need to balance to ensure service standards along with maintaining a reliable and resilient electricity grid. We have worked on a large number of iDNO & ICP projects, from supporting key EV infrastructure projects to working closely with iDNOs to supply bespoke power transformers and packaged substation solutions utilising stocked MV switchgear and LV cabinets.

Transformers following these DNO specifications:

Packaged Substations

Alongside our Tier 2 compliant Wilson d2 (iDNO) Unit Type® Distribution Transformers, we supply medium voltage switchgear and low voltage cabinets approved by all DNOs; UKPN, NPG, NGED, SSE, ENWL, and SPEN.

We offer fully assembled packaged substations using the below options or any other specified equipment. Our options include a packaged solution fully procured by us or free issued by the customer. Our Leeds-based team can provide you with good service and after-sales support.

MV Switchgear

Lucy Electric - Sabre Ring Main Units: VRN2a, VRN6a and others
Schneider Electric - Ringmaster Units: RN2d, RN6d, CN2, SN6, CE2, CE6 and SE6

LV Cabinets

Lucy Electric - Aculok TMO with 4, 5, 6 or 7 outgoing fuse ways or ACB from 800A up to 2500A
Schneider Electric - LV Feeder Pillar with a range of switchable fusegear (4, 5, 6 & 7 fuse ways), MCCB up to 3200A and ACB up to 3200A

DNO Specifications

DNO Compliant Power Transformers

We have expanded our supply to offer Power Transformers that are compliant with DNO design languages. This complements our offer of Power Transformers for the private industry and Wilson d2 DNO-approved distribution transformers for iDNOs and ICPs.

We have a number of designs up to 120MVA with 33kV, 66kV, and 132kV high voltages. Offering ONAN/ONAF/CER cooling methods makes iDNO Power Transformers suitable for load-balancing applications when one transformer can accommodate the full site load in cases of failure or scheduled maintenance. Transformers are offered with an on-load tap changer and ancillaries. Get in touch to discuss your project requirements with our team.

UKPN Wilson Power Transformers at Ironbridge

iDNO & ICP transformers in numbers

kVA Ratings

different designs

1900 +

iDNO & ICP projects

supported

2370 +

Unit Type Transformers

supplied

EV Charging Infrastructure for iDNOs

EV charging infrastructure is expanding rapidly, and iDNOs and ICPs play a vital role in integrating new connections into the grid. Our Wilson d2 (iDNO) Unit Type® Distribution Transformers provide high efficiency and reliability, ensuring seamless power delivery for public charging networks, fleet depots, and commercial hubs. Designed to meet DNO specifications, these transformers support scalable and low-loss energy distribution, essential for the growing demand for EV charging.

With extensive experience in large-scale EV projects, we supply tailored packaged substations that align with iDNO and DNO standards. We partner with key suppliers and hold stock of transformers, and MV and LV equipment to ensure competitive lead times and availability. By combining high-performance transformers with reliable switchgear and LV cabinets, we help iDNOs build a resilient and future-ready charging infrastructure.

high power charging northern ireland - ionity

Our clients

Projects

We worked on a range of DNO, iDNO, & ICP projects

wilson distribution transformer supporting ev charging

Welcome Break

EV charging at motorway service station

UKPN-approved 800kVA Wilson d1 (iDNO) Unit Type ® packaged substation

Electric Vehicles

iDNO & ICP

Ironbridge Power Station

Regeneration of the former coal-fired power station

18/24MVA 33kV/11kV ONAN/CER Wilson Power Transformers

iDNO & ICP

supermarket ev expansion wilson d2 unit type transformer

Sainsbury's EV Charging

Unit type transformers for EV expansions

UNPN-approved 2MVA Wilson d2 (iDNO) Unit Type® Transformers

Retail & Supermarkets

Electric Vehicles

iDNO & ICP

View all projects

Related Products

Wilson d2 Unit Type Distribution Transformer for DNO, iDNO & ICP providers

Wilson d2 (iDNO) Unit Type®

315kV to 2.5MVA DNO & iDNO Approved

Stock availability of UKPN, SSE & SPEN approved designs

Overview

Power Transformers

5MVA to 300MVA with voltages from 33kV up to 400kV

Project managers and site engineers for turnkey solutions

Overview

Packaged Substations

MV Switchgear, LV Cabinets and Feeder Pillars

RMUs up to 36kV and ACBs & MCCBs up to 3200A

Overview

Wilson d2 (iDNO) Unit Type® Transformer

Distribution Network Operators (DNOs) are licensed and Ofgem-regulated companies that own and operate the network of towers, pylons, transformers, cables and meters that carry electricity from the national transmission system and distribute it to homes and businesses throughout Britain. DNOs across England, Scotland and Wales are each responsible for rectifying faults or power cuts in a specific geographical area up to 132kV.

Independent Distribution Network Operators (iDNOs) share similarities with Distribution Network Operators (DNOs) as they also own, operate, and maintain local electricity networks and infrastructure. iDNOs typically manage newly installed assets, such as connections for new developments, which are linked to the existing DNO network.

Unlike DNOs, iDNOs are not confined to a specific geographical region. They are regulated by Ofgem like DNOs, though with slightly modified license conditions.

Both DNOs and iDNOs service the existing and replace the old infrastructure including the distribution transformers.

Independent Connection Providers (ICP) are companies accredited by the National Electricity Registration Scheme (NERS) allowing them to build electricity networks to agreed standards and quality required for them to be owned by either a Distribution Network Operator (DNO) or an Independent Distribution Network Operator (iDNO).