What Is a DNO Application for Solar Panels?
If you’re considering installing solar panels, battery storage or an EV charger at your home, you may have heard your installer mention a DNO application. Many homeowners are unaware that approval from the local electricity network operator can sometimes be required before renewable energy systems can be connected to the grid.
Understanding the DNO application process is important because it can affect installation timescales, system design and the amount of electricity your solar panels can export.
In this guide, we’ll explain exactly what a DNO application is, when it’s required and how experienced installers such as SolarTherm UK manage the process on behalf of homeowners throughout the South East and East Anglia.
What Does DNO Stand For?
DNO stands for Distribution Network Operator. A DNO is responsible for maintaining and operating the electricity distribution network in your local area. While your energy supplier bills you for electricity, the DNO manages the infrastructure that delivers power to your home.
Their responsibilities include:
- Maintaining local electricity cables and substations
- Managing grid capacity
- Approving new generation connections
- Ensuring the network remains safe and stable
- Processing solar panel and battery storage applications
Why Is a DNO Application Needed?
When solar panels generate electricity, any surplus energy can be exported back to the national grid. The DNO needs to ensure the local network can safely accommodate this additional electricity generation without causing voltage issues or network instability.
A DNO application allows the network operator to assess:
- Existing grid capacity
- Local network constraints
- Proposed system size
- Battery storage configuration
- Potential export levels
Without approval where required, your installation may not comply with UK grid connection regulations.
When Is a DNO Application Required?
Whether a DNO application is needed depends on the size and type of renewable energy system being installed.
G98 Applications
Smaller domestic solar installations often fall under the G98 process. Under G98, installations below 3.68kWp can usually be installed first and then notified to the DNO after commissioning. This process is simpler and commonly applies to standard residential solar systems.
G99 Applications
Larger solar installations over 3.68kWp typically require a G99 DNO application. Under G99, approval must usually be obtained before installation begins. The DNO will review:
- Solar panel capacity
- Inverter specifications
- Battery storage systems
- Maximum export capability
This assessment ensures the local electricity network can support the proposed system.
Does Battery Storage Require a DNO Application?
In many cases, yes. Modern battery systems can export energy to the grid, meaning they may impact network capacity similarly to solar panels. The requirements depends on battery size, inverter capacity, export settings and existing solar installation. An experienced installer will determine the correct application route and ensure compliance with current regulations.
How Long Does a DNO Application Take?
Timescales vary depending on application type, local network capacity, system size and complexity of the installation. Simple residential applications can often be processed withing a few weeks, while more complex G99 applications may take longer. This is one reason homeowners should choose an installer who understands the DNO process and submits accurate documentation from the outset.
What Happens If the DNO Rejects an Application?
A rejection doesn’t necessarily mean your solar project cannot proceed. The DNO may:
- Request system modifications
- Require export limitations
- Recommend alternative inverter settings
- Suggest network reinforcement options
Many applications can be revised and resubmitted successfully. An experienced solar installer will work directly with the DNO to find a compliant solution that maximises system performance.
Can Solar Panels Be Installed Without DNO Approval?
Where prior approval is required, installation should not proceed until permission has been granted. Failing to follow the correct process can result in:
- Delays to commissioning
- Compliance issues
- Export restrictions
- Potential enforcement action
Professional installers handle these requirements to ensure homeowners remain fully compliant.
How SolarTherm UK Manages DNO Applications
At SolarTherm UK, we manage the DNO application process as part of our solar installation service for homeowners throughout the South East and East Anglia. Our team regularly works with local network operators and understand the technical requirements involved in domestic solar and battery storage projects.
Our service includes:
- System design and assessment
- G98 and G99 application preparation
- Technical documentation submission
- Liaison with the DNO
- Export limitation solutions where required
- Compliance with current grid connection standards
This allows homeowners to enjoy a straightforward installation process while ensuring all regulatory requirements are met.
Why Choosing an Experienced Installer Matters
DNO applications can be one of the most overlooked aspects of a solar installation. Mistakes in applications can lead to delayed installations, additional costs, reduced export capacity and network compliance issues.
Working with an experienced installer helps ensure accurate system design and faster approvals. An MCS certified installation will ensure regulatory compliance and optimised long term performance.
For homeowners investing in solar panels and battery storage, professional management of the DNO process can save significant time and frustration.
Looking for Solar Panels in the South East or East Anglia?
If you’re considering solar panels, battery storage or a complete renewable energy solution, SolarTherm UK can guide you through every stage of the process, including DNO applications and grid connection approvals.
Our experienced team of solar specialists design bespoke systems for your property’s energy needs while ensuring full compliance with UK regulations and network requirements.
Contact SolarTherm UK today for a free, no obligation quote and design, tailored to your property, usage and future energy needs. No hard sell, just honest, expert advice – and the time you need to make an informed decision.
Your home. Your energy. Your future.
Frequently Asked Questions
What is a DNO application?
A DNO application is a request submitted to the local Distribution Network Operator to assess whether a solar, battery storage, or renewable energy system can safely connect to the electricity network.
How long does a DNO application take?
Most domestic applications are processed within a few weeks, although larger or more complex installations may take longer.
Do all solar panel installations require DNO approval?
Not always. Some smaller installations can be installed under G98 regulations and notified afterwards, while larger systems generally require prior approval under G99.
Does battery storage need a DNO application?
Many battery systems require notification or approval, particularly if they are capable of exporting electricity back to the grid.
Will my installer handle the DNO application?
Most reputable solar installers, including SolarTherm UK, manage the DNO application process on behalf of homeowners.
