What Is a DNO and Why Do You Need Approval?
If you are installing solar panels, battery storage, an air source heat pump (ASHP), or an electric vehicle (EV) charger, you may need something called DNO approval. It sounds technical, but it is actually quite simple: it is about making sure your home and the local grid stay safe.
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What Is a DNO?
DNO stands for Distribution Network Operator. These are the companies that look after the electricity cables and infrastructure in your specific area. Think of the electricity network like a network of roads; the DNO makes sure the "roads" are safe, not overloaded, and that everyone has reliable power. The Energy Networks Association provides further information on network operators across the UK.
Why You Need a DNO Application (Easy Guide)
Watch our video guide where we explain the difference between G98 and G99 applications.
When Do You Need DNO Approval?
Your home normally takes electricity from the grid. However, new equipment can change how your home interacts with that grid:
- Solar Panels & Battery Storage: Systems up to 3.68kW per phase usually fall under G98 rules (notification only). Larger systems fall under G99 rules and MUST be approved before being switched on to prevent overloading local lines.
- Air Source Heat Pumps (ASHP): While they do not export power, they draw a significant amount of electricity. The DNO may need to assess your connection capacity.
- EV Chargers: Standard 7kW chargers are usually notified, but faster three-phase chargers or multiple points require formal approval.
Why You Must Wait for Approval
If a system requires G99 approval, you must wait for the DNO's "go-ahead" before switching it on. As mentioned in our video, full G99 applications can take approximately 45 working days [00:01:54]. Switching on early could lead to fines or being asked to remove the installation.
How Blue Ape Renewables Helps
We take the stress out of the paperwork. Blue Ape Renewables manages the entire process for you—we take care of all the legwork so you never have to handle the application yourself. We ensure your system is fully compliant with ENA connection standards.
| Application Management — We submit all G98, G99, and Fast-Track applications on your behalf. |
| G99 Fast-Track — Available for specific battery and solar combinations, typically taking just 10 working days. |
| Expert Compliance — We ensure every installation is safe and fully approved by the National Grid. |
Simple Summary
- A DNO looks after the electricity infrastructure in your specific area.
- G98 is a notification for small systems (under 3.68kW); G99 is for larger systems.
- G99 applications require formal permission before the system can be turned on.
- Failure to wait for approval can result in fines or decommissioning of the system.
- Blue Ape handles all grid applications, DNO approvals, and legwork for you.
- Fast-Track options are often available for specific AC-coupled battery systems.
Protect Your Installation
Ensure your renewable transition is safe and fully approved by the grid.
