Engineering Recommendation for the technical requirements of customer export limiting schemes, enabling generators to connect while managing grid export capacity.
G100 (Engineering Recommendation G100) defines the technical requirements for customer export limiting schemes in the UK. It allows renewable energy installations to connect to the grid with automatic export limitation, managing the amount of power that flows back to the network.
G100 enables connections that might otherwise be refused or delayed due to grid capacity constraints.
Export limitation under G100 is typically required when:
The system continuously monitors and controls export:
Export limiting systems must meet specific standards:
| Requirement | Specification |
|---|---|
| Response Time | Within 15 seconds, maximum 60 seconds |
| Control | Reduce export to agreed Maximum Export Capacity |
| Fail-Safe | Must limit export if control system fails |
| Monitoring | Continuous measurement and logging |
For solar PV installations, G100 offers several benefits:
Our solar installation services include G100-compliant export limiting solutions where required by the DNO.
G98 is the DNO notification process for small-scale generation systems up to 16A per phase (3.68kW single-phase), allowing 'fit and inform' installation without pre-approval.
G99 is the engineering recommendation governing the connection of generation equipment to distribution networks, requiring DNO approval for systems over 16A per phase.
Distribution Network Operators own and operate the local electricity distribution networks that deliver power from the national grid to homes and businesses.
Export limitation restricts how much electricity a solar or battery system can send to the grid, required when local network capacity is constrained.
Solar photovoltaic systems convert sunlight directly into electricity using semiconductor cells, enabling homes and businesses to generate their own renewable power.