To ensure the safe operation of the network it is divided into zones which represent constraint points in the network on account of the additional generation. The ANM system will intervene when real time information relayed back to it exceeds any of the limits at these points.

The table distinguishes between normal expected ANM operation, SHEPD equipment failures and indications where there may be a fault with generator communications. Changes in ANM operation reflect the ANM system operating as expected.

The table distinguishes between normal expected ANM operation, SEPD equipment failures and indications where there may be a fault with generator communications. Changes in SEPD equipment reflect potential issues with the ANM system that are the responsibility of SEPD and the ANM system is not operating as expected. SEPD will endeavour to resolve these as soon as they can.

The table distinguishes between normal expected ANM operation, SEPD equipment failures and indications where there may be a fault with generator communications. Changes in Generator Site Issues reflect potential issues with the communications to one or more generator sites (which is the responsibility of SEPD), power loss failures to the generator or the ANM panel software failure. As a result, the ANM responds by issuing full curtailment to the affected generator as a failsafe response. It is the responsibility of the generator to resolve these issues.