Your solar system partner from start to finish
A DNO application for a solar project can delay even the most committed installations, unless you’ve got the right partner supporting you throughout. When businesses consider installing a rooftop solar system, the focus tends to be on finance, meeting sustainability targets, and operational issues. But there’s a crucial, lesser-known step in the process that can cause serious delays, and in some cases, halt your entire project. That step? Getting approval from your DNO.THE DNO PROCESS for ROOFTOP solar: Your Complete Guide

What is a DNO?
A DNO, or Distribution Network Operator, is the organisation responsible for managing the electrical infrastructure in a given region. There are six main DNOs in the UK, and each one governs a specific area. Their job is to maintain the stability of the grid, which means any new solar system that could export energy needs to be assessed and approved before it connects. To find out who your DNO is, just Google: “Who is my DNO?”Why DNOs Matter
If your system is under 3.6kW (most residential setups), you can inform the DNO after installation. But once you go above that, especially for commercial-scale systems over 50kW, the rules change. You’ll need to submit a G99 application beforehand, detailing your proposed system.The DNO Application Process
In theory, the process should be straightforward. In practice, it requires technical knowledge and experience to navigate effectively. You’ll need to submit:- The G99 application form, filled out with technical specifications
- A single line diagram showing the system’s connection points
- A boundary plan of the site
- Data sheets for every piece of equipment
- Export limits, or even a zero-export requirement
- Requests to amend your proposed system
- Infrastructure upgrade requirements, such as replacing a transformer
How AlphaGen Helps You Navigate a DNO Application for your Solar System

Our Approach Includes:
- Early discovery and scoping: we assess your local grid conditions before submitting a formal application.
- Direct engagement: we set up DNO “surgery calls” to identify and resolve red flags early.
- Expert application support: you give us your MPAN, and we handle the rest, including gathering and reporting technical data.
- Strong DNO relationships: we’ve built rapport with DNO teams across the country, helping smooth the process and avoid delays.
Challenging the System and Removing Barriers
While we navigate the current system, we’re also working to change it. AlphaGen is actively advocating for smarter, more transparent DNO processes. We’ve met with Toby Perkins MP and written to Ed Miliband, Shadow Secretary for Climate Change and Net Zero, with reform proposals. Many of these are now being echoed in government priorities.Our Recommendations Include:
- Removing planning permission requirements for commercial and agricultural solar installations
- Introducing postcode-based DNO capacity maps using a traffic light system
- Imposing a three-month validity limit on unused grid applications
- Implementing independent oversight of DNO capacity assessments
DNO Application for Solar – Act Now!
As more businesses go solar, grid space is becoming limited. The DNO process still takes up to 12 weeks, and delays can have a ripple effect across your entire project timeline. Partnering with AlphaGen gives you the confidence that everything is handled efficiently, accurately, and with your long-term energy autonomy in mind.From early planning to policy engagement, we don’t just manage the system — we’re working to change it.
Get in touch today to start your solar journey.
Call us now on 0800 8620160 or click here to fill out our contact form.