DNO Registration for DIY Solar UK: G98 and G99 Step-by-Step (2026)
- G98 (under 3.68kW): install first, notify DNO within 28 days, free, processed in 10-15 working days
- G99 (over 3.68kW): apply before installation, allow 8-12 weeks, DNO can reject if grid is constrained
- DIY installers can self-register — you do not need an MCS installer to submit the forms
- You need: MPAN number, inverter model, panel specs, single-line diagram, and ENA type test certificate







