G98 notification: what it is and when installers submit one
A G98 notification is the form an installer sends to the DNO within 28 days of commissioning small generation of up to 16A per phase, connecting first and notifying afterwards.
In short
A G98 notification is sent to the DNO within 28 days of commissioning for generation up to 16A per phase. Check system size at quote stage so you know whether the job needs a G99 application before connection.
A G98 notification is the notify-after-connection route to the distribution network operator (DNO) in Great Britain for small, fully type-tested generation of up to 16A per phase, which is 3.68kW on a single-phase supply. Installs that qualify can connect first and tell the DNO afterwards. The installer must submit the notification within 28 days of commissioning. It is a notification, not a permission, so the DNO does not approve the job before work starts.
Which installs qualify
G98 is the Energy Networks Association's Engineering Recommendation for fully type-tested micro-generators connecting to the public low voltage network. The 16A limit applies to the aggregate rating at the premises: the sum of each generating unit, with no allowance for whether they run at full output together. For solar PV, the rating is the inverter's continuous AC rating, not the panel kWp. A single-phase 3kW inverter works out at 3,000 ÷ 230 = 13.04A, which sits inside the limit. A three-phase 9kW unit is 9,000 ÷ (230 x 3) = 13.04A per phase, which also qualifies.
Heat pumps, wind and battery storage are also covered by the notification rules, though each has its own criteria. Batteries count as generation when they export to the network.
When G98 becomes G99
Once the aggregate rating goes above 16A per phase, the job needs a G99 application and the DNO's permission before connection. Adding a battery to a solar system is a common trigger, because the combined connected generation is likely to exceed the limit. Installers on the wrong route risk a connected system that has to be disconnected or reworked while the DNO assesses it.
The same 28-day window applies to multiple installs. If you connect G98 systems at more than one premises within roughly 500m of each other inside 28 days, the multiple-premises process applies instead of the single-premises form.
> Tip: check size at quote stage. Record the inverter AC rating, number of phases and any planned battery on the survey. Work out the amps per phase before you price, so the quote reflects the right route and any DNO lead time.
Managing the notification in practice
Treat the notification as a job step with an owner and a date. Set the 28-day deadline from the commissioning date, attach the commissioning record, and confirm the DNO contact for the postcode. Teams working in Renewables & Solar can capture inverter details and commissioning evidence on site with eForms, then track the notification as a task on the job so it is not forgotten once the crew moves on.
Rules, forms and DNO processes described here apply to Great Britain. Check the current requirements of the relevant DNO before submitting.