In this article, we will explore the importance of DNOs and their role in the energy distribution process.
A Distribution Network Operator (DNO) is a licensed company responsible for distributing electricity in the UK. These operators own and manage the network of cables and towers that transport electricity from the national transmission grid to homes and businesses.
While many are familiar with electricity suppliers like OVO, the role of distribution companies in delivering energy to UK properties is often overlooked.
What is a Distribution Network Operator (DNO)?
There are four distinct types of businesses working together to ensure our lights stay on and our homes remain warm.
Here's a brief overview of the sectors that operate our power network:
- Generation: responsible for power plants.
- Transmission: responsible for transmission networks via the pylons running across the country.
- Distribution: responsible for local distribution.
- Suppliers: electricity sellers like Octopus, E.ON, NPower, British Gas, EDF, Scottish Power, OVO, etc.
Distribution Network Operators are in charge of delivering electricity from the national grid to your residence or business. They oversee the network of towers, transformers, poles, cables, and meters that ensure power reaches your property. In the event of a power outage, they are the ones you should contact for assistance.
DNO regions and operators
In the UK there are 14 different district networks or DNO regions. The map below from the Energy Networks Association will let you know who your DNO is. If you are unsure, you can follow the link to the ENA and enter your postcode and it will let you know.
Connecting solar
When connecting any type of electricity generation to the grid, it is important to notify your local Distribution Network Operator (DNO). While this process is usually straightforward, if you are connecting a home solar system, your responsibilities may vary depending on the system's size. Installers registered with the Microgeneration Certification Scheme should be knowledgeable about these requirements. Wondrwall takes care of this for you and will have applied to the DNO on your behalf.
Small systems of 3.6 kW or lower can be connected by Wondrwall and only require Wondrwall to let the DNO know as small solar arrays are unlikely to result in load issues for the local grid – so the regulation is relatively simple. This is called a G98 application.
Bigger systems that exceed 3.6 kW, will have gotten permission from the DNO to connect to the grid known as a G99 application. In many cases, this will require a network study to check that the local grid network is adequate for the power your system will produce.