What is G100 Export Limitation?

G100 Export Limitation refers to the guidelines and regulations governing the export of energy from grid-connected renewable installations. These guidelines are essential for maintaining grid stability, managing energy, and ensuring the security of supply. Without G100 export limitation, national energy infrastructure could be in danger of becoming over-loaded. Let’s delve into the details:

Understanding G100 Export Limitation

Purpose: The primary purpose of G100 Export Limitation is to prevent grid-connected generators (such as solar panels, wind turbines, or battery energy storage systems (BESS) from exceeding the agreed export capacity. By adhering to these guidelines, energy producers can avoid costly or time-bound upstream network reinforcement.

How It Works: When an energy generator’s export capacity needs to be restricted, an export limitation scheme is implemented. This scheme measures the Apparent Power (in kilowatts) at the installation’s exit point. Based on this information, it either limits the generation/energy storage output or increases customer demand to prevent exceeding the Agreed Export Capacity.

Compliance Requirements:

  • Power Quality Standards: Export Limitation Schemes must comply with relevant power quality standards.
  • ER G100: Generation and energy storage systems must adhere to ER G100 guidelines.
  • ER G98 and G99: Depending on the type of installation, compliance with ER G98 and G99 may also be necessary.

Key Features:

  • Fast Response: The export limitation scheme must reduce exported Active Power within 5 seconds to match or stay below the Maximum Export Capacity.
  • Fail-Safe: If any component or signalling system fails, the scheme must promptly limit the exported Active Power to prevent capacity breaches.

Connection Process

Application: Installers submit an Export Limitation Scheme Application form to National Grid (NG) alongside relevant generation application forms.

Approval: Once NG approves the connection, equipment installation and commissioning can proceed.

Witnessing Tests: NG may witness some commissioning tests.

G99 Fast Track: For single-phase installations with ER G98 compliant generation (e.g., solar PV) and ER G100 compliant Export Limitation Schemes, a streamlined G99 Fast Track process is available.


G100 Export Limitation strikes a balance between grid stability and renewable energy integration. By understanding and implementing these guidelines, we contribute to a sustainable energy future while ensuring reliable power supply.

For more information, you can refer to the National Grid Export Limitation page.

Remember, G100 Export Limitation is not just about compliance; it’s about shaping a greener energy landscape! 🌿🔌

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