Non-Reliable RIsk Notices

Non-Reliable Notices are issued based on generation shortfall in meeting the forecasted demand and also the inability to maintain sufficient responsive supply reserves to meet credible contingency events.

In reference to clauses 3.7.1 and 3.7.2 of the System Control Technical Code, System Control issues Non-Reliable Notices to meet its obligation to notify participants of the estimated period of the Lack of Stand-by generation, the estimated generation shortfall value, and its estimated time of occurrence, at the time the declaration is made.

Table 1 below summarises active Non-Reliable Notices, which affect system participants in the Darwin-Katherine, Tennant Creek, and Alice Springs Power Systems.

Table 2 below summarises historical Non-Reliable Notices that have either expired or been cancelled based on the forecasted demand and the available generation.

The following terminology has been used:

ASPS: Alice Springs Power System.
DKIS: Darwin-Katherine Interconnected System.
LOS: lack of Stand-by Generation.
LOS1: Lack of Standby Generation 1 “refers to Loss of Largest Node”.
LOS2: Lack of Standby Generation 2 “refers to Loss of Largest Generating Unit”.
LOS3: Lack of Standby Generation 3 “refers to Loss of any Generating Unit”.
NRN: Non-Reliable Notice.
SCTC: System Control Technical Code.
SR: Spinning Reserve.
TCPS: Tennant Creek Power System.

Note: A declaration of LOS2 automatically indicates an LOS1 situation, while a declaration of LOS3 automatically indicates both LOS1 and LOS2 situations.

For more information on the information presented below please Contact SCOperationsPlanning.PWC@powerwater.com.au.

Table 1: Active Non-Reliable Notices

Region	NRN ID	Commencement Date and Time	Anticipated End Date and Time	LOS Condition	NRN Description

Table 2: Historical Non-Reliable Notices

Region	NRN ID	Commencement Date and Time	Anticipated End Date and Time	LOS Condition	NRN Description
Darwin-Katherine	2412030	11/12/2024	11/12/2024	LOS2	As a result of forced outages, planned generation maintenance, and restricted generation output, a Non-Reliable Notice was in effect on 11/12/2024, approximately between the hours of 16:00 to 21:00 in the DKIS.
Darwin-Katherine	2409079 - V2	01/10/2024	02/10/2024	LOS2	As a result of forced outages, planned generation maintenance, and restricted generation output, a Non-Reliable Notice was in effect from 01/10/2024 to 02/10/2024, approximately between the hours of 15:30 to 21:00 in the DKIS.
Darwin-Katherine	2409079 - V1	30/09/2024	01/10/2024	LOS1	As a result of forced outages, planned generation maintenance, and restricted generation output, a Non-Reliable Notice was in effect from 30/09/2024 to 01/10/2024, approximately between the hours of 17:00 to 20:00 in the DKIS.
Darwin-Katherine	2408119	29/08/2024	30/08/2024	LOS1	As a result of forced outages, planned generation maintenance, and restricted generation output, a Non-Reliable Notice was in effect from 29/08/2024 to 30/08/2024, approximately between the hours of 16:30 to 21:00 in the DKIS.