guide

DNOs: Who is my distribution network operator?

04 December 2020 | Matt Mostyn

dno distribution network operator

A short guide to DNOs and what they do

A Distribution Network Operator (Or DNO) is a company licensed to distribute electricity in the UK. These companies own and operate the system of cables and towers that bring electricity from the national transmission network to our homes and businesses.

Most of us know about the companies that supply electricity to consumers  (such as OVO). But there’s another aspect to the delivery of energy to UK homes and businesses – distribution. And many of the leading distribution companies are largely unknown to the public. In this guide we’ll look at who they are, and what they do.

What is a Distribution Network Operator (DNO)?

You might be surprised to learn there are actually 4 different types of businesses involved in keeping our lights blazing and our homes warm. Here’s a quick summary of the sectors that run our power network:

  1. Generation: responsible for power plant ownership and operation
  2. Transmission: responsible for high voltage transmission networks
  3. Distribution: responsible for local distribution via towers, cables and meters
  4. Suppliers: electricity sellers like OVO

Distribution Network Operators run the distribution of electricity from the national grid to your home or business. Being responsible for the network of towers, transformers, poles, cables and meters that deliver power to your home, they’re also the people to call if there’s a power cut

By the way, if you’re experiencing a power cut, call 105 (free from most landline and mobile numbers) to be put straight through to your local District Network Operator.

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DNO regions and operators

In Great Britain there are 14 different district networks or DNO regions. However, because these 14 regions are managed by just six operators, it’s relatively simple to work out yours.

DNO map: find your local DNO supplier

The map below (from the Energy Networks Association) gives a good visual idea of where each DNO operates. If you’re looking to work out who your DNO is, check below to find the right contact details.

dno

Who is my District Network Operator? 

First, check the map to find out who your Distribution Network Operator is. Then, if you need to contact them, you can find the right number in the details below (from the ENA):

Area (code)CompanyEmergency No.WebsiteTwitter account
North Scotland (17)SSE Power Distribution0800 300 999www.ssen.co.uk@southernelecPD
Central and Southern Scotland (18)SP Energy Networks0800 092 9290www.spenergynetworks.co.uk@SPEnergyNetwork
North East England (15)Northern Powergrid0800 668 877www.northernpowergrid.com@Northpowergrid
North West England (16)Electricity North West0800 195 4141www.enwl.co.uk@ElectricityNW
Yorkshire (23)Northern Powergrid0800 375 675www.northernpowergrid.com@Northpowergrid
Merseyside, Cheshire, North Wales and North Shropshire (13)SP Energy Networks0800 001 5400www.spenergynetworks.co.uk@SPEnergyNetwork
East Midlands, West Midlands, South Wales & South West England (11, 14, 21, 22)Western Power Distribution0800 6783 105www.westernpower.co.uk@wpduk
Eastern England (10)UK Power Networks0800 316 3105www.ukpowernetworks.co.uk@UKPowerNetworks
Southern England (20)SSE Power Distribution0800 072 7282www.ssen.co.uk@southernelecPD
London (12)UK Power Networks0800 316 3105www.ukpowernetworks.co.uk@UKPowerNetworks
South East England (19)UK Power Networks0800 316 3105www.ukpowernetworks.co.uk@UKPowerNetworks
Northern IrelandNorthern Ireland Electricity0345 764 3643www.nie.co.uk@NIElectricity

DNO by postcode

If for some reason you can’t work out who you should call from the map and tables above, simply enter your postcode here to find out.

District Network Operator solar connection

Whenever you connect any type of electricity generation to the grid, you need to inform your local Distribution Network Operator (DNO). In general this isn’t a big issue – but if you’re connecting a home solar system, be aware that your responsibilities will change, depending on the size of the system you’re installing. Any installer registered with the Microgeneration Certification Scheme should be well aware of these details, but it's worth knowing the following: 

Smaller systems

If you’re connecting a small system (up to 16A per phase or 3.7 kW), your installer just needs to inform the DNO within 28 days of the system’s commissioning. Small systems are unlikely to result in load issues for the local grid – so the regulation is relatively simple. For more details, check out this guide on the G83/2 engineering recommendation.

Larger systems

For bigger systems, your installer will need permission from the DNO in order to connect to the grid. In many cases this will require a network study (which you may be charged for), to check that the local grid network is adequate for the power your system will produce. If the grid needs additional work to cope with the energy from your system, the DNO is required to provide you with a quote for the work within 45 days.

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