G100 export limitation schemes

The DNO's connection offer caps your export below what your generation could produce — a constrained network, a shared transformer, a cautious planner. Without an export limitation scheme, your choices are to shrink the system or pay for reinforcement. With one, you install the system the site deserves and guarantee the grid never sees more than the agreed figure.

That guarantee is what EREC G100 — currently Issue 2 Amendment 2, G100/2 for short — regulates: how export is measured, how fast the scheme reacts, what happens when something fails. The DNO's confidence in your scheme decides how smoothly your application runs.

A compliant scheme is more than a relay in a box. It's measurement at the right point of supply, control that actually reaches your inverters and generators, fail-safe behaviour that defaults the site to a safe state, and documentation the DNO can accept without a meeting.

ENICO designs the whole scheme and builds it into real switchgear — a standalone panel, or integrated into the PV distribution board or main switchboard where it belongs. One assembly, one set of documentation, one point of responsibility.

Compact sites need one measurement point and one controller. Large sites — multiple inverter groups, long cable runs, solar farms — need a distributed architecture that manages many control points as one scheme, over fail-safe communication links. We build both; the distributed case has its own page.

From reading the connection offer to the day the settings are sealed: we confirm what the offer actually requires, engineer the scheme to match, supply the Appendix C paperwork carrying our register reference, and support any on-site testing the DNO chooses to carry out.

An export limit changes how the whole site should behave: it strengthens the case for using generation on site rather than spilling it, and it has to coexist with peak-shaving schemes and battery control without the two fighting. The pages below cover both.