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All you need to know about G98, G99 and a DNO applications

If you’re new to the world of solar energy, it can be quite easy to be lost and confused with terminology, applications and so much more! But fear not, as we’ve put together this simple guide that tells you all you need to know about the elements of solar energy including a G98 application,G99 application and a DNO application so let’s dive right in.

Who’s the District Network Operator (DNO)?

The District Network Operator is a company that owns and distributes electricity and gas from the National Grid to both commercial and domestic properties. Depending on the geographical area your property is in, the DNO will vary. There are 14 different District Networks, or DNO regions, that operate within the UK, however, 14 of these regions are managed by six operators. They are responsible for the network of towers, transformers, cables, and meters that distribute energy to the properties.

What is a DNO application for solar?

A DNO solar application refers to the process of submitting an application to a Distribution Network Operator (DNO) for the connection or modification of electrical infrastructure to the local distribution network. The DNO solar application is typically made by individuals, businesses, or organisations seeking to connect renewable energy sources, such as solar panels or wind turbines, to the grid or to make alterations to the existing electrical connections.

Whenever you want to connect a solar power system, you must complete a DNO application with the relevant distribution network operator. This allows them to accurately calculate the necessary electricity. The documentation required depends on the size of the solar generator. Generally, the larger the system, the more forms you’ll need to fill out before installation. For solar power systems, the threshold is typically 16 amps per phase. The inverter’s AC output helps determine your rated amp output. If you’re unsure of the amp rating, ask the installation company, as their electricians can provide guidance. Small systems, with an AC output of under 16 amps per phase, can usually be registered by submitting a G83 form to the DNO, allowing immediate installation. For systems with an AC output of over 16 amps per phase, classified as large, you must contact your DNO before installation and complete the necessary forms. The DNO’s review process can take up to eight weeks.

How Do I Get a DNO Letter?

To acquire a DNO (Deed of Non-Objection) letter for installing solar panels, start by researching local regulations and utility company requirements. Then, submit a formal application detailing your proposed solar panel installation plans, including system specifications and any relevant technical information. Coordinate with your utility provider to ensure compliance with grid connection standards and safety protocols. Upon approval, the utility company will issue the DNO letter, confirming their non-objection to the solar panel installation and grid connection, facilitating a smooth and lawful process.

What is a G98 application?

A G98 form is used in the UK to register small-scale embedded generation systems, like solar PV systems, with the local distribution network operator (DNO). It applies to microgeneration systems up to 16 amps per phase (3.68 kW per phase). The G98 orm ensures compliance with Engineering Recommendation G98 standards. Installations can proceed, but the DNO must be notified within 28 days of commissioning. Approval can take up to 8 weeks. The G98 application includes details on the system type, capacity, inverter specifications, and installer information. This notification process ensures that the local network can safely accommodate the additional power generation without compromising safety or reliability. The G98 application process is simpler and quicker for systems below this threshold compared to larger installations, promoting the adoption of renewable energy. This ensures that microgeneration systems are integrated safely and efficiently into the local electricity grid, supporting sustainable energy practices.

What is a G99 application?

The G99 application is a process for any integrated microgeneration and storage units that are a generation over 16A (3.68kW). G99 is the regulation surrounding the connection of any form of generation device that runs in parallel or synchronised with the main electrical utility grid. When submitting the highly complex application to the DNO, additional information is required from you such as a signed letter of authority and site plans, as well as a connection design created by us that must be accurate. Depending on the specifics of the G99 application, it can take anywhere from 10 up to 45 working days to come back as approved (may be subject to cost for connection depending on the size of the system).

Why has the DNO limited my exports?

The DNO application for solar requires that no more than the predetermined amount of electricity can be exported back to the grid. The DNO can request that the system must have an export limitation device in place and this is so large amounts of surplus energy can’t be sent back to the National Grid and affect the surrounding cabling. This is because it can only handle a predetermined amount set by the DNO. 

What is an export MPAN? 

An export MPAN is a Meter Point Administration Number which is a unique 13-digit reference relating to the export of electricity from a premises. To be eligible for exporting renewable energy from the property to the National Grid, a Smart Export Guarantee (SEG) export tariff must be in place with the energy provider and your property must have an export MPAN.

Where can I retrieve my export MPAN?

 Once your solar PV system has been installed at the property and commissioned, the DNO is notified. Once you decide you want to start exporting renewable energy back to the grid, you will have to apply for the SEG. The energy provider should then contact the DNO to request an export MPAN.

 What is a Smart Export Guarantee?

A Smart Export Guarantee (SEG) is a scheme that was put in place by the government that pays property owners for the renewable electricity that they export back to the grid. This was introduced back in 2019 to replace the feed-in tariff (FIT) scheme, which also paid for renewable energy that property owners generated and then exported back to the grid.

How to sign up for an SEG tariff

 Signing up for a SEG tariff should be done through the chosen energy provider for the property. They will request a copy of two different documents and these are the MCS certificate and the DNO acceptance letter. The MCS certificate will be issued to you in your handover pack and this will be sent once all relevant documentation is signed and any outstanding balances have been settled, after the installation of your solar PV system. The DNO acceptance letter is usually sent via email and this will be forwarded to you following the installation.

Get in touch for further information

We hope we’ve given you a better understanding of the key elements of solar energy. Suppose you’re still unsure about anything explained above. In that case, if you have any questions relating to your existing solar panel system, or you’re ready to take the step and invest in solar energy, don’t hesitate to contact our expert team today who are always on hand to answer any questions and queries you may have.

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