5Minimum network performance requirements

5 Minimum network performance requirements

(1)  Power system planning in respect of a relevant transmission system must be such that the system is likely to meet the following network performance requirements:

(a) in respect of an intact transmission system –

(i) no more than 25 MW of load is to be capable of being interrupted by a credible contingency event; and

(ii) no more than 850 MW of load is to be capable of being interrupted by a single asset failure; and

(iii) load that is interrupted by a single asset failure is not to be capable of resulting in a black system; and

(iv) the unserved energy to load that is interrupted consequent on damage to a network element resulting from a credible contingency event is not to be capable of exceeding 300 MW.h at any time; and

(v) the unserved energy to load that is interrupted by a single asset failure is not to be capable of exceeding 3 000 MW.h at any time;

(b) in respect of a transmission system that is not an intact transmission system, the active energy exposed to interruption by a credible contingency event is not to be capable of exceeding 18 000 MW.h at any time.

(2)  The network performance requirements under subregulation (1) constitute the service standards that a Provider must take into account, for the purposes of the regulatory investment test for transmission, in carrying out power system planning in respect of a relevant transmission system.

(3)  For the purpose of meeting the requirements under subregulation (1) , a Provider may use load shedding –

(a) to control network load after a non-credible contingency event; or

(b) as specified in a contract, agreement or arrangement entered into by the Provider and a Transmission Customer.

(4)  For the purpose of calculating unserved energy under subregulation (1) , any replacements or repairs undertaken must be taken to not exceed –

(a) 48 hours to repair a transmission line; or