Enter your inverter's output and supply type to find out instantly whether your balcony solar system needs a G98 notification or a G99 application — under UK grid connection rules (EREC G98/G99).
This tool applies the standard UK EREC G98/G99 thresholds (16A per phase for G98). It's general guidance, not a substitute for confirming with your own DNO. Find your DNO at the Energy Networks Association.
Your Distribution Network Operator (DNO) runs the local cables that connect your home to the grid. When you add generation, they need to know — the rules come from Engineering Recommendation G98 and G99.
| System | Rule | What it means |
|---|---|---|
| ≤ 3.68kW single-phase (16A) | G98 | Connect first, notify DNO (often within 28 days) |
| ≤ 11.04kW three-phase | G98 | Connect first, notify DNO |
| Above those limits | G99 | Apply and get approval before connecting |
Every standard 600W/800W balcony kit sits comfortably inside G98 — the notification is a formality, not a barrier. It only becomes a G99 application if you're stacking several systems or adding a large battery.
Thresholds per ENA Engineering Recommendation G98 Issue 2 (2025). Last verified July 2026.
Read the full DNO & G98 guide → Compare the best balcony solar kits →For a standard single-phase balcony solar system of 800W (0.8kW) or less, you file a G98 connection notification with your DNO — for most plug-in kits this can be done after installation. Systems above 3.68kW (16A) per phase, or above 11.04kW on three-phase, require a G99 application and prior approval before connection.
G98 covers micro-generators up to 16A per phase — 3.68kW on a single-phase supply, or 11.04kW total across three phases. Below this limit you can connect first and notify the DNO; above it you must apply under G99 and get approval before connecting.