DNO Notification for Plug-In Solar UK: G98 and Registration Guide
- DNO Notification Rules for Plug-In Solar Systems Across the UK
- G98 and G99 Routes for Plug-In Solar Grid Connections in the UK
- Preparing and Completing a Plug-In Solar DNO Notification
- Plug-In Solar and Battery Options for Wider Home Energy Management
- Plug-In Solar DNO Checklist Before and After Grid Connection
- Conclusion
- FAQs
Plug-in solar has been gaining attention as an easier way for UK households to generate some of their own electricity without a large upfront investment in a rooftop project. But it is not as easy as installing generation equipment and turning it on to start creating power when connected to a home electrical system. If the electricity generating equipment is connected in parallel with the public network, then DNO notification for plug-in solar may be part of the connection process.
The local electricity network that supplies homes and businesses in a specific area is controlled by a Distribution Network Operator (DNO). Depending on the type of solar system and the size of the system, the connection can be either under G98 rules of connecting eligible smaller generators or requires a G99 application and approval prior to connection.
Having an understanding of these requirements in an early stage prevents the homeowner from getting confused regarding registration, inverter capacity and supporting documents. It covers when a solar DNO notification might be required, the difference between G98 and G99, the information that is usually required and how plug-in solar can work as part of a broader home energy system.
DNO Notification Rules for Plug-In Solar Systems Across the UK
While in many ways, smaller plug-in solar is a bit simpler than a conventional rooftop installation, when a generation device is connected to the public power grid, the connections requirements are significant. The emphasis should be on whether the system can interface with the grid, not necessarily on how easy it is to install.
Plug-In Solar Connections That Can Trigger Local DNO Notification
With a plug-in solar system, a solar inverter converts solar electricity from DC to AC for home use. Where that equipment is being used in parallel with the grid, there may be surplus generation that can flow beyond the property and so this makes DNO notification for plug-in solar relevant.
The route to use depends on several factors, such as inverter output, the generation already in place, and the nature of the system. A small system should not then be automatically presumed not to be subject to DNO requirements. This is especially crucial if the property already has rooftop solar or a battery or another grid connected generator.
Local DNO Responsibilities for Small Grid-Connected Generators
A Distribution Network Operator manages the local electricity network that supplies electricity to homes and businesses in the area. Its functions include providing safe, reliable network connections, which matter for small generators as more households start generating power.
A solar DNO notification may require technical details such as inverter size, the equipment to be installed, and how much generation is already installed at the property. Depending on the type and size of the installation, a smaller installation can take a relatively straightforward G98 route while larger or more complex installations may need to take the G99 route.
Plug-In Solar Notification Compared With Energy Supplier Tasks
The DNO and the electricity supplier have different roles. Your supplier takes care of issues like the tariff, the billing, and if applicable, the export-payment system. The DNO handles the local network and generation connections.
So informing an energy supplier about solar equipment does not automatically secure an export tariff, nor does a completed DNO registration automatically create one.
Separate responsibilities prevent homeowners from taking duplicate or missing steps. Once you understand the DNO's responsibilities, the next question is whether the proposed plug-in solar installation falls under the G98 connect-and-notify process or the G99 application process.
G98 and G99 Routes for Plug-In Solar Grid Connections in the UK
If the plug-in solar system is inter-connected with the electricity network, the next step is to determine the appropriate inter-connection route. Smaller installations in Great Britain may still be subject to G98 and installations over the limits to G98 will typically shift to G99. Northern Ireland has different variants of these engineering recommendations, and you should always check local requirements before installation.
G98 Connect-and-Notify Rules for Eligible Plug-In Solar Systems
G98 offers a simplified pathway for small, compliant generating equipment at low voltage. The general application is for the aggregate registered capacity of up to 16A per phase. This is typically about 3.68kW at 230V for a single phase supply.
The main benefit is that qualifying equipment can be connected through a simpler process than larger generation systems. But, that does not imply that homeowners will be able to neglect network requirements. The inverter and other generating equipment must comply with appropriate standards, and information must be provided to the DNO post-connection.
The bottom line for plug-in solar system is to check that the system qualifies before assuming G98 will apply just because the system is “small.”
Combined Inverter Capacity When Checking G98 Eligibility Limits
If you have solar generation installed, or another inverter-based system, combined generation capacity is important. Each new device isn't separate; G98 eligibility is based on the aggregate capacity connected at the premises.
For example, a small plug-in solar power installation and an existing rooftop PV installation would change the overall connection point. This is why homeowners must provide accurate details about the equipment already in place before installation.
Battery storage also requires careful consideration, as grid-connection use of electricity storage is considered generation. Reviewing the entire system will determine whether the installation can be made under G98 or whether another route is needed.
G99 Applications for Larger or More Complex Solar Connections
G99 typically applies where generation is in excess of the G98 threshold. G99 is not the same as the connect and notify method, which is simpler but normally requires an application to the DNO before installing and connecting generation equipment. The DNO can then evaluate the proposed system and its impact on the local network.
You can include site information, including existing generation, proposed inverter capacity, and equipment details. For larger or more complex systems, a technical assessment may be required before it's approved for connection.
The best way to approach this, therefore, is to establish the overall proposed capacity at the outset. This decision not only affects the paperwork involved, but also determines what information will be needed for the plug-in solar DNO notification and/or application.
Preparing and Completing a Plug-In Solar DNO Notification
However, once the correct G98 or G99 route is identified, the next practical step is collecting the information needed for the plug-in solar DNO notification. Having these details ready before installation can avoid delays, and it makes it easier for the installer or homeowner to keep a complete record of the connection.
MPAN, Property and Installer Details Needed for DNO Registration
The DNO notification must accurately identify the property and electricity supply. The most helpful reference is the Meter Point Administration Number (MPAN), which is the electricity supply point. ENA Connect Direct also requests the installation address, customer information, installer/company information, and installation details.
Normally, installers handle the technical submission, but homeowners should have a copy or copies of the information provided. If other generation (e.g. solar storage) exists on the property, it should be stated upfront so that the DNO can appreciate the full connection.
Inverter Ratings and ENA Type-Test Details Used in Notification
Information on technical equipment is also relevant. DNO must be informed of the type of inverter/generating equipment that is to be connected and the rated output.
Micro-generators must be connected with equipment that is type tested for G98 connections. Manufacturers provide supporting verification information via the ENA Type Test Register, enabling installers and DNOs to verify that equipment has been tested to the relevant G98 or G99 requirements.
This is where the make and model of the item is important. Improper or incomplete inverter information may make registration more difficult, especially when multiple generating devices are located at the same property.
Commissioning Dates, Submission Timing and DNO Confirmation Records
The commissioning date is the date a compliant G98 installation is considered to be running. G98 states that the installer must provide the DNO with the commissioning date within 28 days of commissioning (including the commissioning day), along with the relevant installation documentation.
Submit the forms, and the homeowner should keep the forms and any confirmation from the DNO. These records may be beneficial down the road when organizing an export tariff, equipment replacement or system expansion. Some suppliers will also ask for proof that the DNO recorded the installation before progressing an export tariff application.
Once the grid-connection paperwork is sorted, the next question is whether plug-in solar can coexist with battery storage and broader household energy management.
Plug-In Solar and Battery Options for Wider Home Energy Management
While the required DNO application will address the network component of a solar installation, the homeowner still needs to decide how to use the electricity generated. A smaller solar PV installation could help offset daytime energy usage directly, and battery storage could increase the benefit of solar generation during times when the PV system is not generating much power, if at all. This depends on the household's situation—whether they are building a new solar system or adding on to an existing installation.
EcoFlow Plug-In Solar Kit for Simple Home Solar Generation Needs
The EcoFlow Plug-In Solar Kit is designed to make solar power generation easier for the home, intended for households seeking a lower barrier to entry. It may suit customers who want to start with a smaller solar installation rather than opting for a larger rooftop installation.
The final product card will be based on the confirmed UK product specification and connection guidance at product launch, as the product is being introduced separately. Householders should also verify any electrical and DNO notification requirements before connecting any generation equipment to the household supply.
EcoFlow STREAM 5000 for New Solar and Storage Home Installations
Households who are developing solar generation and battery storage in tandem might opt for the EcoFlow STREAM 5000 as a more integrated home-energy solution. It boasts a 5.24kWh battery capacity and can charge from up to 4,000W of PV input, allowing it to store energy generated during the day, even if the house doesn't need it immediately or it isn't exported to the grid.
This makes it more relevant in places where energy is used outside of daylight hours. Solar energy stored for use in the evening can help homeowners raise their share of solar power they use and control the portion of electricity they take from the grid to power their appliances and other home uses.
When planning a new solar installation, solar capacity, inverter output and battery equipment should be taken into account for the applicable DNO connection route.
EcoFlow STREAM AC 5000 for Existing Solar Homes Adding Storage
For homes that already have solar panels, a different problem arises: the electricity generation system is fine, but the household generates more than it consumes during the day and must buy electricity from the grid in the evening.
The EcoFlow STREAM AC 5000 is designed for this retrofit situation. With its 5.24kWh storage capacity, it lets households with existing solar panels add solar storage without redesigning the solar system. It can therefore help shift daytime generation to periods of higher demand, such as the evening.
Plug-In Solar DNO Checklist Before and After Grid Connection
Working through a short checklist on the following parameters before adding or extending a plug-in solar system can be helpful: capacity, equipment details and registration records. These checks minimize risk of selecting an incorrect connection path or missing information for later use.
Confirm Total Inverter Output Across All Connected Generation
First verify the rated output of each inverter installed on the site. It encompasses existing rooftop solar, battery inverters and any new plug-in solar equipment. DNO requirements may be dependent on the overall system and not just the latest device used.
Check Whether G98 Notification or G99 Approval Applies
Once the total capacity is confirmed, check whether it fits within the appropriate G98 limits or requires a G99 application. Depending on the system size, a smaller compliant system may only need to be connected after notification, while a larger or more complex system may need approval before connection.
Prepare MPAN, ENA Type-Test and Equipment Information
Have the property MPAN, inverter make, model, rated output, and relevant ENA Type Test Register information at hand. Detailed equipment information helps the DNO and ensures the information submitted matches the actual installation.
Submit Required DNO Information Within the Correct Timeframe
This will vary depending on the route. Eligible G98 systems are generally connected first and informed of the connection later, within the required time, while G99 systems are normally assessed by the DNO before connection. Don't assume what the process is, ask the installer or local network operator.
Keep Registration Records for Future Energy System Changes
Keep copies of forms, commissioning information, and DNO acknowledgement after installation. These documents can prove useful if any additional solar panels are added to the household's installation, if battery storage is added to the system, if the inverter is changed or if the household applies for an export tariff.
Good installation documentation makes it easy to maintain a system over time. The purpose of DNO registration is not to register the network once only, it is to keep the network record current with the equipment actually connected to the property.
Conclusion
Understanding DNO notification for plug-in solar helps homeowners plan a compliant plug-in with minimal hassle. The key steps are confirming the inverter's total capacity; determining whether G98 or G99 applies; preparing the required property and equipment information; and maintaining clear records after commissioning.
Plug-in solar can offer a more accessible pathway to solar generation for households beginning to invest in solar. Those planning on expanding their energy management can later add solar to their battery storage, for example, like the EcoFlow STREAM 5000 for new solar-home energy storage systems or the EcoFlow STREAM AC 5000 for existing solar homes that are adding storage.
Regardless of the option chosen, verify DNO requirements before making changes to the system to ensure the installation is properly documented and prepared for future additions, such as export arrangements or other energy equipment.
FAQs
Can Renters Submit DNO Notification for a Plug-In Solar System?
Renters may be included in a plug-in solar DNO notification, but should first review the tenancy agreement and request any necessary landlord consent for electrical or structural modifications. The installer will also require the appropriate property and supply information. Where the system interfaces with the household electrical installation, it is advised to take into account the landlords opinion and the requirements of the DNO prior to installation.
Does Moving Home Require a New Plug-In Solar DNO Notification?
A DNO notification is associated with the generating equipment connected at a particular electricity supply point. If a plug-in solar system is removed and then re-installed at another property, any connection checks and notification may be required at the new property. The homeowner must not expect the registration to automatically transfer with the equipment when moving from the previous address.
Can SEG Registration Be Completed With Only a G98 Notification?
The G98 Notification can be used as evidence that the DNO has registered a small generator as an eligible small generator, although suppliers usually have additional requirements for SEG applications. These can consist of appropriate export metering, proof of installation and other documents of eligibility. Therefore, individuals should check with their specific Smart Export Guarantee provider, as DNO registration is not a full SEG application.
Does Adding Battery Storage Change an Existing DNO Registration?
The battery storage could change the total inverter capacity and electrical configuration reported for the property. If a house already has registered solar generation, the new storage system should be evaluated against the existing DNO-registered criteria. The installer will be able to indicate if a new G98 notification is needed, if another connection is required or if further supporting information is needed.
Can Plug-In Solar Be Disconnected Without Telling the Local DNO?
Temporary switching off is not necessarily considered the same as permanent removal. If you permanently remove, replace, or significantly alter plug-in solar equipment, it's wise to consider whether the local DNO record should be updated. Keeping registration information aligned with the equipment actually connected at the property can make future solar, battery, or export arrangements easier to manage.