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DNO Approval: What It Means for You

DNO approval is your official permission to connect solar and batteries to the grid. It sets your export limit, ensures safe connection, and is essential for registering export tariffs

What is DNO Approval?

Your DNO approval is permission from your local Distribution Network Operator (DNO) to connect your solar (and battery) system to the electricity grid.

  • The DNO manages the local cables, substations, and infrastructure in your area.

  • Approval ensures your system won’t overload the network when it exports electricity.

Think of it as your “permission slip” to connect safely.

Why is DNO Approval Needed?

  1. Safety First – It prevents too much electricity flowing back into the local grid at once.

  2. Legal Requirement – All grid-connected solar systems in the UK must be registered with the DNO.

  3. Export Control – It defines how much electricity you’re allowed to export at any one time.

  4. Smooth Connection – Without it, your system could be limited or even refused export.

Types of DNO Applications

  • G98 (Smaller Systems)

    • Covers most domestic solar installs up to 3.68kW per phase.

    • Usually just a notification after installation (no prior approval needed).

  • G99 (Larger Systems / Batteries)

    • Required if your system is bigger than 3.68kW per phase or includes a large battery.

    • Needs pre-approval from the DNO before installation.

What Does DNO Approval Tell You?

Your approval letter/email will confirm:

  • Your system has been accepted for connection.

  • Your export limit (the maximum you can send to the grid).

  • Any conditions (e.g., a smart meter required, or system limited at 6kW export).

How Does It Affect You?

  • Usable System Size vs. Export Limit

    • You can still use the full size of your system at home.

    • The export limit only controls what flows out to the grid.

    • Example: You install an 8kW solar system, but DNO approval sets a 6kW export limit. You can still generate and use all 8kW — only 6kW can be exported.

  • Tariff Eligibility

    • Energy suppliers may ask for proof of DNO approval when registering for export tariffs.

FAQs

❓ Who applies for DNO approval — me or Apex Doma?
We handle the DNO application process for you as part of your installation.

❓ Can export limits be increased later?
Sometimes. You can request an upgrade from your DNO, but it may depend on local network capacity.

❓ Does DNO approval affect battery storage too?
Yes. Batteries that export to the grid are included in the approval.