DNO Electricity Explained: UK Networks, Plug-In Solar and G98 Rules
- Understanding DNO Electricity Across the UK Distribution Network
- DNOs, Electricity Suppliers and Transmission Networks Compared
- Plug-In Solar, G98 and DNO Responsibilities for Home Generation
- Plug-In Solar and Battery Options in a Modern Home Energy Setup
- Practical DNO Checks for Plug-In Solar and Home Energy Upgrades
- Conclusion
- FAQs
While most households see their electricity supplier as the company that sets their tariff and issues the monthly electricity bill, another organisation ensures electricity is available in the area: the Distribution Network Operator, or DNO. A DNO manages the electricity network in its region, distributing electricity to homes and businesses.
If someone in the house makes changes other than changing suppliers, it helps to understand the DNO electricity role. Solar panels and other electrical equipment (such as an electric vehicle charger and plug-in solar/battery storage) can affect the power drawn from, or fed back into, the local power grid.
This is where the DNO's work becomes more visible. Depending on the equipment type and size being connected, homeowners may need to follow G98 notification requirements or another connection process.
This guide covers how a DNO functions, the difference between distribution and electricity supply and transmission and why plug-in solar and home energy upgrades can affect day-to-day home planning with a DNO.
Understanding DNO Electricity Across the UK Distribution Network
To understand the DNO electricity network, it helps to distinguish it from the supplier that sends the bill. Electricity is distributed to homes via a number of stages, and the DNO is responsible for the regional distribution stage, which is the link from the wider power system to the individual streets, properties and local businesses.
DNO Meaning in Electrical Terms for UK Homes and Energy Systems
DNO is the acronym for Distribution Network Operator. It is the business entity responsible for running and maintaining the electricity distribution network within a specific geographic territory.
For most households, the DNO works in the background. You're more likely to notice it when you're facing a power outage, need a new power connection, or are installing new equipment like solar generation, battery storage, or an EV charger.
The household does not buy electricity from the DNO. Instead, it controls the local network through which electricity flows safely from the grid to houses and buildings.
Local Network Responsibilities Across Cables and Substations
A DNO is responsible for things like local substations, underground cables and overhead lines. These assets are used to reduce and distribute electricity at appropriate voltage levels before it arrives at residential and less commercial properties.
It is also responsible for network reliability, responding to faults, and undertaking upgrade plans as local demand changes. If new generation is being connected, the DNO may also want to know how much electricity might be fed back into the local network as well.
This is especially relevant with new plug-in solar installations and rooftop PV and battery storage as electricity can now flow both ways, from the grid to the property or from the property to the grid
Distribution Network Management as Electricity Demand Changes
The local electricity network was originally designed around predictable consumption patterns, but household energy use is becoming more complex. EV charging, electric heating, solar generation, and battery systems can change when and how much electricity flows in a local area.
A DNO then faces rising electricity demand and a larger volume of small-scale generation. This can include strengthening the network at certain sites, limiting new connections or setting export caps at sites where capacity is an issue.
For homeowners, this context will help before they install new gear. The next step is to differentiate between the DNO, electricity suppliers, and transmission networks, each of which performs a specific function in the overall energy system.
DNOs, Electricity Suppliers and Transmission Networks Compared
There are several organisations that are involved in providing electricity to a UK household but they do not carry out the same role. Getting to know who is responsible for what can save time in case of a power breakdown, changing tariff or new generation connections. The easiest way to understand the system is to think of transmission as moving vast amounts of electricity across the nation, distribution as bringing electricity into local areas, and suppliers as managing the commercial relationship with customers.
Electricity Suppliers and DNOs Performing Different Network Roles
An electricity supplier is the company a household selects to provide electricity at a certain tariff and bill. It purchases electricity on behalf of its users and bills and processes customers' accounts. Households can therefore change suppliers when another tariff or supplier better suits their needs.
Households do not opt for a DNO, which is why it is different. The electricity DNO depends on the property's location. It has nothing to do with energy prices or customer tariffs; it relates to the local physical network.
This separation also applies to solar installations. A supplier may face an export tariff, and the DNO must decide whether the generating equipment can be safely connected to the local network.
Transmission Networks Moving Power Before Local Distribution Begins
Electric power passes through the high-voltage transmission system before it enters the distribution system. This section of the grid transmits large amounts of electricity over long distances from large generators to various regions.
At lower voltages, DNO networks step in, using substations and local cables to deliver electricity closer to individual properties. In reality, this means transmission and distribution are integral components of one electricity system, but at different scales.
Electricity is no longer flowing only towards homes—the difference becomes more significant. Excess solar power can be pumped back through local systems
Finding Your Electricity DNO Through Local Network Area Information
DNOs have defined areas of operation, and you can identify the right company from the property's location or your electricity supplier's details. The network operator lookup service, or data based on an MPAN's address details, can be used to identify the DNO serving a homeowner's address.
Knowing your electricity DNO is important before you install generation or undertake significant electricity upgrades. Provides a clear point of contact for the homeowner and installer for connection requirements
Plug-In Solar, G98 and DNO Responsibilities for Home Generation
The DNO's role becomes much more apparent when most households are not just consumers of electricity but also producers. Plug-in solar is a great example since even a modest solar setup can provide generation that is connected to the local power grid. With a better grasp of how plug-in solar operates, it's easier to see why network rules remain important even when the system is small.
Plug-In Solar Adding Distributed Generation to the Local Network
Plug-in solar generates electricity where it is needed. This is called distributed generation because power is produced on individual household premises and not at a limited number of large central power stations.
If the solar power is less than the household's energy needs, electricity can be taken from the electrical grid. If generation exceeds immediate demand, however, some electricity may be able to flow back to the local network, depending on the system design.
DNOs require visibility of relevant generation connected in their area for that two-way flow. The network operator doesn't decide whether a homeowner should install solar power; they ensure connected solar power operates safely alongside other properties and infrastructure in the area. Homeowners considering a smaller setup may also find it useful to understand the wider UK position on plug-in solar before installation.
G98 Connect-and-Notify for Eligible Small Generation Systems
G98 offers a simplified route for connection to small scale generation. Generally, it can follow a connect-and-notify procedure if the installation does match the applicable limits and technical requirements, as it would for a larger installation.
Homeowners should know that “small” does not mean “unregulated.” The installer still needs to consider inverter capacity, existing generation, and whether the equipment complies with the required standards.
If solar panels or battery storage are already installed on the property, the installation should be considered a full system as the presence of existing equipment can impact the type of connection routing.
G99 Requirements for Larger or More Complex Grid Connections
If the proposed generation is not within the G98 conditions, then G99 may be used. This process typically requires a pre-connection assessment by the DNO before the connection is made, allowing the network operator to consider the proposed installation.
The assessment can take into account total generation capacity, inverter configuration, and local network conditions. The DNO may impose connection conditions or export limits before the system can be put into use in certain instances.
This distinction demonstrates the importance of understanding the role of the DNO in practice. It links the broad electricity-network narrative with domestic electricity-making choices. After understanding the path of the connection, the homeowner can determine whether plug-in power from solar and battery storage can be incorporated into a larger home energy system.
Plug-In Solar and Battery Options in a Modern Home Energy Setup
Knowing only the DNO side of home generation is half the story. Once a household learns how to interface with the grid using solar panels, the next question is where the electricity will be used. Some houses might need a straightforward solution to offset daytime use, while others may need storage to shift solar power into the evening. This is where the system's size and goals matter more than adding more equipment.
EcoFlow STREAM 5000 for New Solar and Storage Home Installations
Households considering solar panels and storage in tandem can adopt a more integrated approach. With a 5.24 kWh battery and a PV input of up to 4,000W, EcoFlow STREAM 5000 can store solar power when it is generated but not needed, for later use.
This can improve solar self-consumption by shifting solar electricity production later in the day and reducing reliance on grid electricity after sunset. Those who want to explore this setup more broadly can also learn about solar battery storage for a home energy system.
EcoFlow STREAM AC 5000 for Existing Solar Homes Adding Storage
Existing solar homes start from a different point. While their panels can already now produce electricity that can be used during the day, any excess electricity can be exported, and electricity can be imported later at night.
This is the use case EcoFlow STREAM AC 5000 is built for, where the device provides 5.24kWh of storage power to an existing solar system. It is not a replacement for the existing generation system, but it provides an alternative way for households to store energy for later use.
The battery size should still be determined by actual household use rather than the battery's generating power alone. Homeowners should understand the capacity of the batteries they're considering so they can compare it with their household's evening energy consumption.
Practical DNO Checks for Plug-In Solar and Home Energy Upgrades
The most valuable DNO tests are often basic checks done before ordering equipment or DNC. An early view of the entire system can help avoid misunderstandings about capacity, connection routing, and future expansion.
1. Identify the Local DNO Before Major Home Energy Changes
Firstly, ensure that the Distribution Network Operator (DNO) that supplies the property is identified. This is based on geography, not the electricity supplier. Having the correct DNO gives the installer a clear point of contact if a notification, application, and/or technical enquiry is required.
2. Check Combined Generation and Inverter Configuration at Home
Never evaluate a newly installed solar device without taking the whole solar installation into account. Total capacity at property is dependent on existing rooftop PV, battery inverters and other generation.
A small plug-in solar addition can therefore alter the overall configuration, even if it has a small solar output. Taking inventory of the existing inverter rating makes the next inverter connection decision more accurate.
3. Confirm Whether G98 or Another Connection Route Applies
After understanding the entire system, determine if the installation is still eligible for G98 or needs to go through a different connection process, like G99.
This should be based upon actual equipment or total connected capacity and not on assumptions about equipment size or product description.
4. Keep DNO and Installation Records After Adding New Equipment
Keep a record of DNO notifications, approvals, commissioning information and equipment specifications. These records can be valuable later when an inverter change, battery storage or export-related services are required.
Good documentation also helps future installers understand what has been installed without recreating the home history.
5. Review Connection Requirements When Expanding the System Later
Being compliant today doesn't necessarily mean you can connect all future additions under the same circumstances. Changes to the property's generation profile may occur with the addition of more solar panels, another inverter or additional storage.
Review the new system total capacity and connection arrangement prior to system expansion. It's better to consider the DNO record as a dynamic one that grows with the home energy system, rather than a one-off process.
Conclusion
By learning about DNO electricity, homeowners will better understand how local networks support their daily electricity use and why connection rules matter when adding generation. The DNO operates the distribution system in the area, is not the electricity supplier or the electricity transmission network, and its primary function is to ensure safe and reliable operation of the distribution network in the region.
With regard to plug-in solar, the most important thing is understanding how it works, whether it is G98 or another connection method, and how it will interact with current generation or storage.
More flexible home energy systems can let households use more of the electricity they generate at home through solar power and battery storage, while reducing electricity imports from the grid. Maintaining up to date DNO records assists with future upgrades and helps ensure that the system is sited in accordance with local DNO connection requirements.
FAQs
Can Homeowners Change Their DNO Without Moving to Another Area?
No, unlike changing electricity supplier, homeowners cannot change their DNO as it depends on the geographic location of their property. A change of network area can change the DNO but not necessarily the tariff or supplier, and it does not change the local distribution company responsible for the property.
Does Changing Supplier Affect the Property DNO Registration?
Switching electricity suppliers will not usually change DNO registration, as the electricity supplier and network operator are separate. Any solar generation or battery equipment registered with the DNO so far stays with that property and DNO connection point. But export-tariff agreements may have to be renegotiated with the supplier of choice.
Can Plug-In Solar Be Installed Before Identifying the Local DNO?
Before installing plug-in solar on the household electrical system it is preferable to determine who is the local DNO. If the network operator is known, the installer can ensure that the connection path is correct in advance, and know what kind of notification is required. This is especially critical if the property is already equipped with solar panels, storage or other inverter systems.
Does the DNO Decide Which Electricity Tariff a Home Can Use?
No, the DNO operates the local electricity grid, not electricity tariffs. Electricity suppliers set tariff rates, and they handle billing. Although the DNO can influence the type of generation that can connect to the local network, it is not responsible for deciding whether a household opts for a fixed, variable, time-of-use, or export tariff.
Can a DNO Limit Solar Export From an Existing Home Installation?
Yes, in some circumstances. The DNO can impose an export limit as part of the connection arrangement if the local network cannot accept more generation. In some cases, an export-limitation system can let a household install more generation and then manage exports to the grid.
This doesn't necessarily mean the house can produce and use less solar electric power. Instead, it caps exports outside the property, making self-consumption and battery storage even more important when generation exceeds demand.