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Are you wondering what a DNO application is? Or what does DNO stand for? Then read on and find out everything you need to know about DNO applications for solar panels in the UK! 

What is a DNO Application?

You need to let your local DNO know if you want to install solar panels or any other energy device that will connect to the National Grid. This is important for your home or business, because your DNO needs to know how much electricity you will use and produce. You can do this by filling out a DNO application form and sending it to the right DNO for your region.

The type of DNO application you need will depend on the size of your solar PV system and whether you have to apply before or after your installation. Generally, the bigger the solar PV system, the more paperwork you need.

Don’t worry if this sounds complicated. Our in-house solar energy team at NXTGEN Energy will handle any DNO applications for you, so you wont have to worry about your DNO application form.

DNO Meaning

DNO is short for Distribution Network Operator. DNOs are companies that have the license to deliver electricity from the National Grid to your home or business. The UK has 14 different district networks or DNO regions, which are owned by 6 groups:

  1. Electricity North West Limited (ENWL)
  2. Northern Powergrid
  3. Scottish and Southern Energy (SEE)
  4. ScottishPower Energy Networks (SPEN)
  5. UK Power Networks (UKPN)
  6. Western Power Distribution (WPD)
DNO Map UK

Who is the DNO for my region?

You can easily find out your Distribution Network Operator by going to the Energy Networks Association (ENA) – The voice of the networks website and typing in your postcode. As NXTGEN Energy are a Nationwide solar panel installation company we have worked with all 14 DNOs in the UK.

DNO contact numbers

Finding your Distribution Network Operators (DNOs)

To identify your electricity distributor you’ll need the relevant first two digits shown as part of your MPAN (Meter Point Administration Number).

Your MPAN is the unique identifying number for the electricity meter at your property, often referred to as a ‘Supply Number’ or ‘S’ number. This number is made up of 13 digits highlighted in the bottom row of the illustration below.

Contacting your Electricity Distribution Network Operators (DNOs).

For example, the ‘10’ in the bottom row corresponds with the Distribution ID for UK Power Networks in the look-up table below. Alternatively, you can call us on 0845 366 3661 to find out who your electricity distributor is.

The MPAN will be shown on any bills you have, and may also appear on a recent letter or email we’ve sent you.

DNO finder

MPAN PrefixDNO RegionDNO Company & AddressEmergency NumberGeneral Enquiries

10

East England

UK Power Networks
UK Power Networks, Fore Hamlet, Ipswich, Suffolk, IP3 8AA

Free phone number 105

0800 029 4285

11

East Midlands

Western Power Distribution
Information Centre, Western Power Distribution, Avonbank, Feeder Road, Bristol, BS2 OTB

Free phone number 105

0800 096 3080

12

London

UK Power Networks
UK Power Networks, Fore Hamlet, Ipswich, Suffolk, IP3 8AA

Free phone number 105

0800 029 4285

13

North Wales, Merseyside and Cheshire

Scottish Power Energy Networks
Customer Service, SP Energy Networks, PO Box 168, Prenton, CH26 9AY

Free phone number 105

0330 101 0444

14

West Midlands

Western Power Distribution
Information Centre, Western Power Distribution, Avonbank, Feeder Road, Bristol, BS2 OTB

Free phone number 105

0800 096 3080

15

North East England

Northern Powergrid
Northern Powergrid, RSXE-RCZX-XKBL, Manor House, Station Road, Penshaw, Houghton-le-Spring, Tyne and Wear, DH4 7LA

Free phone number 105

0845 070 7172

16

North West England

Electricity North West
Customer Relations, Electricity North West, PO Box 4375, Manchester, M61 0ET

Free phone number 105

0800 048 1820

17

North Scotland

Scottish and Southern Energy
Scottish Hydro Electric Power Distribution, Inveralmond House

Free phone number 105

0800 048 3516

18

Central and Southern Scotland

SP Energy Networks
Customer Service, SP Energy Networks, PO Box 8729, Bellshill, ML4 3YD

Free phone number 105

0330 101 0444

19

South East England

UK Power Networks
UK Power Networks, Fore Hamlet, Ipswich, Suffolk, IP3 8AA

Free phone number 105

0800 029 4285

20

Southern England

Scottish and Southern Energy Power Distribution
Southern Electric Power Distribution, Walton Park, Walton Road, Cosham, Portsmouth, PO16 1UJ

Free phone number 105

0800 048 3516

21

South Wales

Western Power Distribution
Information Centre, Western Power Distribution, Avonbank, Feeder Road, Bristol, BS2 OTB

Free phone number 105

0800 096 3080

22

South West England

Western Power Distribution
Information Centre, Western Power Distribution, Avonbank, Feeder Road, Bristol, BS2 OTB

Free phone number 105

0845 601 2989

23

Yorkshire

Northern Powergrid
Northern Powergrid, RSXE-RCZX-XKBL, Manor House, Station Road, Penshaw, Houghton-le-Spring, Tyne and Wear, DH4 7LA

Free phone number 105

0800 011 3332

24

Independent

Independent Power Networks Ltd
Energy House, Woolpit Business Park, Bury St Edmunds, Suffolk IP30 9UP

Free phone number 105

01359 243311

25

Independent

ESP Utilities Group
Bluebird House, Mole Business Park, Leatherhead, Surrey, KT22 7BA

Free phone number 105

01372 587 500

26

Independent

Energetics Electricity Ltd
International House, Stanley Boulevard, Hamilton International Technology Park, Glasgow, G72 0BN

Free phone number 105

01698 404949

27

Independent

The Electricity Network Company Ltd (GTC)
GTC, Energy House, Woolpit Business Park, Bury St Edmunds, Suffolk, IP30 9UP

Free phone number 105

01359 243311

28

Independent

UK Power Networks (IDNO) Limited
Fore Hamlet, Ipswich, Suffolk, IP3 8AA

Free phone number 105

0800 029 4285

DNO Contact Numbers

When do you need to apply for a DNO application?

You need to tell your local DNO provider if you are making any big changes to your electricity connection. A big change means installing any of these green energy devices:

* Islanding is the condition in which Distributed Generation (DG) equipment like solar battery storage continues to power a location even though external electrical National Grid power is no longer present. Islanding can be dangerous to utility workers, who may not realize that a circuit is still powered, and it may prevent automatic re-connection of devices.

Can you avoid DNO permission?

You need DNO permission for any solar PV system or EV Charger that connects to the National Grid, unless it is an off-grid system. This is because you have to follow the National Grid rules in your region when you connect to it. The National Grid rules will help the UK reach Net Zero in 2050 by managing the growing use of electric devices or energy assets like electric cars and heat pumps. You have to let your local DNO know so they can handle the extra demand and pressure on the National Grid. This is important for avoiding local power cuts and making sure the supply in your region is efficient.

Why do you need a DNO certificate for solar panels?

You need a DNO certificate to install a solar panel system that connects to the National Grid. Otherwise, you will miss out on the Smart Export Guarantee (SEG) scheme payments from the National Grid, which is a reward for being connected to the National Grid.

Different types of DNO applications for solar panels

The type of DNO application you need depends on the size of your solar PV system. The size is measured by the AC inverter rating, not the peak DC rating of the solar panels. There are two main types of DNO applications: “connect and notify” or “apply to connect”.

DNO G98 Applications

For small-scale Distributed Generation (DG) equipment at your home or business, you need to contact an MCS certified solar PV installer, like NXTGEN Energy. Your system must be under 16A per phase to be small-scale. That means 3.68kWp for a single-phase supply or 11.04kWp for a three-phase supply. If you are not sure about your system size, you should ask your solar panel installer.

Your installer will do an Adequacy of Supply (AoS) check to see if your current electricity supply can handle the extra load. If it can, your installer can put up your solar panels without asking for the DNO first. But you will have to tell the DNO within 28 days after the solar PV system is set up. This is because a small-scale system usually does not cause any problems for your local grid. If your current supply is not good enough, your installer may have to upgrade it before installing the solar panels.

DNO G99 Applications

For large-scale solar systems, greater than 16A per phase, you will have to get DNO approval before installation. This is because the National Grid has to check if your local distributor can deal with the extra load. The DNO may take 8 to 12 weeks to review your DNO application. If your Distributed Generation (DG) equipment is rated at 50kW or more, you will have to fill out a Standard Application Form (SAF) as well.

DNO G100 Applications

If your G99 application says that your system’s export has to be limited, you’ll need a G100 application form. At NXTGEN Energy, about 5% of our DNOs for solar panels get limited. A G100 DNO will cost you an extra £300-£750 for the application, and it will also take longer to install your solar PV system, because you’ll need an extra device with it.

The outcomes of a DNO application

You will usually get a connect offer letter after your DNO application is checked. This tells you the maximum specification of the connection and if you have to pay any connection charges. There are usually three results of a DNO application.

  • Your application is approved: your DNO is fine with the size of the solar PV system you want to install. This means you can go ahead with your installation, with no extra costs or changes.
  • The system size is limited to a certain kWp AC rating: you need an export limitation. Sometimes you’ll have to pay a small fee for a DNO witness test, where your provider makes sure a limitation is in place.
  • You need to upgrade your supply size from a single-phase to a three-phase system to install your solar panels: this extra charge can be expensive depending on the site, and is normally related to the size of your property.

If the DNO rejects your application to connect, you may have to install an export power management system to control the electricity generated from the solar PV system that goes to the National Grid.

How much does a DNO application cost?

You don’t have to pay for the G98 DNO application for “connect and notify”, but your solar panel installers may charge you some fees to handle the application. The G99 and G100 applications can cost you anywhere between £300 – £750 each, with Scottish Power often being the most expensive as your DNO sets the price.

How long does a DNO application take?

The DNOs are taking longer to process because of the high demand for homegrown energy in the last year. A G98 application for solar panels usually takes about 3 months, but a G99 can take up to 4-6 months lately, even though it is supposed to only take around 8-12 weeks.

MCS Certified Solar Panel Installers

You don’t have to worry about DNO applications, if you choose NXTGEN Energy, the experts in DNOs for solar panels. If you want to install solar panels, solar batteries or EV chargers for your home or business in the UK, call our solar energy team today at 01268 928 690, email info@nxtgen.ltd or click on the ‘Enquire Now’ button below and get our 5-Star service. We include all DNO applications in our solar packages, and we serve the whole country, so don’t hesitate to contact us.

Frequently Asked Questions about DNO Applications

What is a DNO application?

DNO stands for a Distribution Network Operator. They are the energy companies that control all the towers, cables, and electricity distribution within their designated area. When you are looking to install any solar panel system, such as EV charging infrastructure, you must complete a DNO application.

How do I get a DNO certificate?

This is done by simply filling out a DNO application and sending it to your relevant Distribution Network Operator for your region. The size of your solar PV system will determine the type of DNO application you will have to complete and if you will have to apply before or after installation.

How much does DNO approval cost?

A G98 DNO application is free. This is because it is known as a “connect and notify” and covers small solar PV systems, which are under 16amp per phase. For larger systems, covered by G99 and G100 applications, there is a fee, usually between £300 and £750. Most home solar systems will be covered by a G98 DNO application.

How long does it take to get DNO approval?

The DNO will normally be in touch with you within 45 days for low voltage energy devices and 65 days for high voltage energy devices to approve installation or make further contact about appropriate amendments needed.

Do I need DNO approval for battery storage?

DNO permission is also required for any solar battery storage system that has backup functionality and that ‘islands’ the property from the National Grid in the event of a power cut.

Do I need to notify DNO of solar panels?

What is the process for notifying a DNO of a Solar PV System installation? You must notify the relevant DNO in your region of your electricity generating installations in all instances, including Solar PV technologies.

What is the difference between the National Grid and a DNO?

Their main task is to run the distribution of electricity from the National Grid to your house or your business’s premises. DNOs are responsible for the network of overhead lines, cables, pipes, transformers, meters, and towers that deliver energy to your home.

Do I need a DNO G98 or DNO G99?

If you are connecting single or multiple phase generators at multiple premises of up to 16A (3.68kW) per phase, you need to complete a G98 DNO application form before you can connect. If you are connecting large scale generation, above 16A (3.68kW) per phase or energy storage, then you will need to complete a G99 DNO application form.

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