The new G99 Fast Track application process has transformed how larger solar PV systems can be installed in Northern Ireland. Introduced by NIE Networks in May 2026, G99 Fast Track allows homeowners, farms and businesses to install larger solar panel systems without going through the full G99 approval process. In this guide, we’ll explain what G99 Fast Track is, how it differs from G98, the costs involved, approval times, export limits and whether it’s the right option for your solar installation.
What was the previous G98 Application for Solar Panels like?
The previous G98 fit-and-inform process for solar panels limited single phase properties to 3.68kW solar inverter capacity, and three-phase to 11.04kW. This meant that any property wanting a larger solar PV system needed to apply for a full G99. The G99 comes with a sizeable application fee which begins at £702 excluding VAT, and varies on the solar PV system size, as well as a 3-month minimum decision timeline.
What is G99 Fast Track?
G99 Fast Track is a streamlined process introduced by NIE Networks, designed to make solar PV system applications quicker and simpler. Under the new G99 Fast Track rules, you can now install up to a total of 60A/phase of inverter capacity (with no one inverter larger than 32A). The export, however, remains the same as for a G98: 16A or 3.68kW for single phase, and 48A or 11.04kW for three phase.
Essentially, the new G99 Fast Track rules allow you to install a larger solar inverter capacity, but they don’t allow you to export more electricity back to the grid.
What are the benefits of G99 Fast Track in Northern Ireland?
The introduction of G99/Fast Track has opened up lots of new opportunities for homeowners and businesses looking to maximise the benefits of solar energy in Northern Ireland.
Install More Solar Panels
One of the main advantages of G99 Fast Track is the ability to install significantly more inverter capacity than was previously possible under G98 regulations. This allows for larger solar PV systems with more solar panels, helping properties in Northern Ireland generate more electricity throughout the year.
For larger properties with high energy consumption such as farms and commercial buildings, this increased solar energy generation capacity can lead to great savings and improved energy independence.
Improved Performance During Winter
Larger solar PV systems don’t just produce more energy during the summer. They can also help improve overall system performance during the darker winter months when solar generation is naturally lower. By installing more panels, you can maximise energy production whenever daylight is available, helping to offset electricity costs year-round.
Faster Solar Battery Charging
A larger inverter capacity also allows batteries to charge at a faster rate. This means you can store more of the electricity generated by your solar panels and use it when you need it most, such as during the evening when energy demand is higher.
This can be particularly beneficial for customers on Economy 7 or Day/Night tariffs, as batteries can also be charged using cheaper overnight electricity and then discharged during peak-rate periods.
Maintain Export Capability
Unlike some full G99 applications, which may only be approved on a zero-export basis, G99 Fast Track installations can still export electricity to the grid within the permitted limits. This means you can continue to benefit from export payments for excess electricity that your system generates but doesn’t use.
Who Can Benefit from G99 Fast Track?
G99 Fast Track is particularly beneficial for properties in Northern Ireland with higher than average electricity consumption or those looking to install a larger solar PV system. It can be an excellent option for:
Homeowners
Homeowners with electric vehicles, heat pumps or high household energy usage can benefit from the ability to install larger solar PV systems and battery storage solutions.
Farms and Agricultural Buildings
Many farms across Northern Ireland have significant daytime electricity demand. G99 Fast Track allows larger solar PV systems to be installed, helping to offset energy costs while making better use of available roof space.
Commercial Properties
Businesses, warehouses, manufacturing facilities and office buildings can benefit from increased solar generation capacity, reducing reliance on grid electricity and improving long-term energy savings.
Properties Installing Battery Storage
Properties looking to maximise battery storage can benefit from the higher inverter capacities available under G99 Fast Track, allowing batteries to charge quicker from solar generation and off-peak electricity tariffs.
How is solar energy export limited with G99 Fast Track?
Depending on your solar inverter, a G100 Export Limiter is either built-in to the inverter, or an additional Export Power Manager is installed alongside your PV system to ensure the NIE G99 Fast Track guidelines are adhered to.
Export is limited according to phase, so for single-phase properties your export is limited to 3.68kW, and for three-phase it will be limited to 11.04kW – the same as a G98 system!
How much does a G99 Fast Track application cost?
The application for G99 Fast Track currently costs £311 for single and three-phase. If you choose to go for a G99 Fast Track option with First Class Solar, this is included in your total system cost along with a non-refundable administration fee for the additional work and mapping that’s required for lodging the application.
How long does approval take for G99 Fast Track in Northern Ireland?
NIE Networks estimate that the timeline for approval for the G99 Fast Track will take approximately 20 working days (4 weeks). However, as the process is still in the initial rollout phase, it may take slightly longer – but overall, it’s still much quicker than a full G99!
How many inverters can I install on a G99 Fast Track?
Single phase:
Most domestic properties and quite a lot of chicken farms are single-phase power.
The G99/Fast Track rules state that the total installed capacity (TIC) is 60A/phase, with maximum inverter size of 32A.
This means a total of 13.8kW inverter capacity. Examples below of appropriate inverters installed under G99/Fast Track regulations for single phase:
- 3 x 3.6kW
- 2 x 5kW
- 2 x 6kW
Three-phase:
Most commercial or larger industrial buildings will have three-phase connections, and the G99/Fast Track follows the same rules of 60A/phase TIC, with maximum inverter size of 32A.
For a three phase connection, this means a total of 41.4kW total inverter capacity. Examples below of appropriate inverters installed under G99/Fast Track regulations:
- 3 x 10kW
- 2 x 20kW
If you’re considering installing a solar PV system in your home or business in Northern Ireland and you want to know exactly how much you’ll save with a G99 Fast Track system, get in touch with the First Class Solar team today.
Enter your details on our website form and a member of the team will be in touch, otherwise please give us a call on 02896005042 or email info@firstclasssolar.co.uk.