What Are G99 & G100 Applications?

What is the G99 & G100 application process, and why it is important for solar projects.

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What is a G99 application?

A G99 application is a crucial process in the UK for connecting commercial solar power systems to the electricity grid. This application is governed by the Engineering Recommendation (EREC) G99, which outlines the technical requirements for connecting generation equipment that operates in parallel with the grid. Here’s a detailed overview of what a G99 application entails and why it’s important.

What is the purpose of a G99 application?

The Purpose of G99

The G99 regulation is designed to ensure that any generation installation exceeding 16A (3.68kW) per phase meets specific safety and operational standards. This is particularly relevant for larger solar installations, as they can impact the stability and reliability of the local electricity network. The G99 framework helps to mitigate risks associated with grid disturbances, ensuring that both the generator and the grid can operate harmoniously.

Who Needs to Apply for a G99?

Any commercial entity planning to install solar panels with a capacity greater than 3.68kW must submit a G99 application. This includes businesses, schools, and other organisations looking to harness solar energy for their business operations. The application process is essential for ensuring compliance with national grid standards and for securing the necessary permissions to connect to the grid.

Importance of G99 Compliance

Compliance with G99 is not just a regulatory requirement; it also plays a vital role in promoting the safe integration of renewable energy sources into the grid. By adhering to these standards, businesses can contribute to a more sustainable energy future while ensuring that their installations do not compromise the reliability of the electricity supply.

G100 Applications & Compliance

A G100 application refers to a specific type of application related to the connection of distributed energy resources (DERs) to the electricity grid in the UK. It is part of the regulatory framework that ensures safe and efficient integration of technologies like solar panels, battery storage, and electric vehicle chargers into the grid.

Key Points about G100 Applications:

Purpose: G100 applications are designed to manage the export of electricity from renewable sources to the grid, particularly when the capacity of the local network is limited.
When Needed: If a G99 application (for larger systems) indicates that export limitations are necessary, a G100 application must be submitted. This typically occurs when the system’s output exceeds what the local grid can handle safely.
Costs and Process: Applying for a G100 can incur additional costs and may extend the installation timeline due to the need for extra equipment to manage the export limits.

This framework is crucial as it also helps maintain grid stability while accommodating the growing number of renewable energy installations.

The application process

Preparation

Before submitting a G99 application, applicants must gather essential documentation, including:

Site layout plans
Manufacturer specifications for the solar equipment
A detailed description of the proposed installation
MPAN (Meter Details)

Submission

The completed G99 application form, along with the supporting documents, must be submitted to the relevant Distribution Network Operator (DNO). The DNO is responsible for managing the local electricity distribution network and will review the application to assess its impact on the grid.

Assessment

Once submitted, the DNO will conduct a thorough assessment. This process has a 3 month SLA set by the DNOs during which the DNO evaluates the technical specifications and potential effects on the network. They may request additional information or modifications to the proposed installation. Dependent on the size of the project, the application may be referred to National Grid and incur extra delays.

Connection Offer

If the application is approved, the DNO will issue a connection offer, detailing the terms and conditions for connecting the solar installation to the grid. This offer may include requirements for additional equipment or modifications to ensure compliance with safety standards, restrictions on export capability or investment in required infrastructure upgrades..

Installation and Commissioning

After accepting the connection offer, the installation can proceed. Once the solar system is installed, it must undergo commissioning/witness tests to verify that it meets all operational and safety standards before it can be officially connected to the grid.

Summary

In summary, the G99 application process is a fundamental step for any commercial entity looking to connect a solar power system to the UK electricity grid. It ensures that installations are safe, reliable, and compliant with national standards, ultimately supporting the transition to renewable energy sources. By understanding and navigating this process, businesses can effectively harness solar energy while contributing to a greener future.

Shawton Energy fully manage the process when any business uses us to design, build and install and solar project and through our extensive daily contact with all the DNO’s, we feel we are best positioned to deliver a good result on this important part of the process.

If you have further questions around the G99 application process then get in touch with us and we’ll be happy to take you through the process.

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