Market Notices

AEMO ELECTRICITY MARKET NOTICE

AEMO's weather service provider has issued forecast temperatures equal to or greater than the NEM Local Temperature Alert Levels for listed weather stations below.

NSW
Deniliquin Ap (39+ Deg C): 18th Dec, 19th Dec
Lake Macquarie (39+ Deg C): 21st Dec
Mudgee Ap (39+ Deg C): 21st Dec

QLD
Dalby Ap (37+ Deg C): 20th Dec, 21st Dec

SA
Adelaide West Terrace (39+ Deg C): 18th Dec
Clare High School (39+ Deg C): 18th Dec
Port Augusta Ap (39+ Deg C): 17th Dec, 18th Dec, 19th Dec

VIC
Ararat Prison (39+ Deg C): 18th Dec
Mildura Ap (39+ Deg C): 18th Dec, 19th Dec

The NEM Local Temperature Alert Levels are:

Launceston Ti Tree Bend: 33 Deg C, Dalby Airport: 37 Deg C, for all other selected weather stations: 39 Deg C.

AEMO requests Market Participants to:

1. review the weather forecast in the local area where their generating units / MNSP converter stations are located and,

2. if required, update the available capacity in their dispatch offers or availability submissions consistent with the forecast temperatures.

Further information is available at:

https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/nem-forecasting-and-planning/forecasting-and-reliability/projected-assessment-of-system-adequacy/nem-local-temperature-alerts

AEMO Operations Planning

AEMO ELECTRICITY MARKET NOTICE

AEMO's weather service provider has issued forecast temperatures equal to or greater than the NEM Local Temperature Alert Levels for listed weather stations below.

NSW
Deniliquin Ap (39+ Deg C): 18th Dec, 19th Dec

QLD
Dalby Ap (37+ Deg C): 20th Dec

SA
Adelaide West Terrace (39+ Deg C): 18th Dec
Clare High School (39+ Deg C): 18th Dec
Port Augusta Ap (39+ Deg C): 17th Dec, 18th Dec, 19th Dec

VIC
Ararat Prison (39+ Deg C): 18th Dec
Mildura Ap (39+ Deg C): 18th Dec, 19th Dec

The NEM Local Temperature Alert Levels are:

Launceston Ti Tree Bend: 33 Deg C, Dalby Airport: 37 Deg C, for all other selected weather stations: 39 Deg C.

AEMO requests Market Participants to:

1. review the weather forecast in the local area where their generating units / MNSP converter stations are located and,

2. if required, update the available capacity in their dispatch offers or availability submissions consistent with the forecast temperatures.

Further information is available at:

https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/nem-forecasting-and-planning/forecasting-and-reliability/projected-assessment-of-system-adequacy/nem-local-temperature-alerts

AEMO Operations Planning

AEMO ELECTRICITY MARKET NOTICE

AEMO has conducted technical assessments to evaluate the adequacy of existing over-frequency generator shedding (OFGS) scheme in South Australia. The OFGS scheme helps to maintain frequency operating standards by tripping generators in a pre-determined manner during over-frequency conditions, to minimise the risk of cascade tripping.

AEMO?s review found that system security risks can arise when high levels of power transfer out of SA coincide with periods when the available OFGS capacity is insufficient to manage potential over-frequency conditions for a non-credible trip of the Heywood interconnector. As such a system normal constraint is required to manage the combined SA export capacity under such conditions, so as to maintain SA power system operations within the limits advised by ElectraNet.

The following constraint equation was implemented at 1425hrs 15 December 2025:
S_V_HEYWOOD_OFGS


Ben Blake
AEMO Operations

AEMO ELECTRICITY MARKET NOTICE

AEMO's weather service provider has issued forecast temperatures equal to or greater than the NEM Local Temperature Alert Levels for listed weather stations below.

NSW
Deniliquin Ap (39+ Deg C): 18th Dec, 19th Dec

SA
Adelaide West Terrace (39+ Deg C): 18th Dec
Clare High School (39+ Deg C): 18th Dec
Port Augusta Ap (39+ Deg C): 17th Dec, 18th Dec, 19th Dec

VIC
Ararat Prison (39+ Deg C): 18th Dec
Mildura Ap (39+ Deg C): 18th Dec, 19th Dec

The NEM Local Temperature Alert Levels are:

Launceston Ti Tree Bend: 33 Deg C, Dalby Airport: 37 Deg C, for all other selected weather stations: 39 Deg C.

AEMO requests Market Participants to:

1. review the weather forecast in the local area where their generating units / MNSP converter stations are located and,

2. if required, update the available capacity in their dispatch offers or availability submissions consistent with the forecast temperatures.

Further information is available at:

https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/nem-forecasting-and-planning/forecasting-and-reliability/projected-assessment-of-system-adequacy/nem-local-temperature-alerts

AEMO Operations Planning

AEMO ELECTRICITY MARKET NOTICE

AEMO's weather service provider has issued forecast temperatures equal to or greater than the NEM Local Temperature Alert Levels for listed weather stations below.

SA
Port Augusta Ap (39+ Deg C): 12th Dec

The NEM Local Temperature Alert Levels are:

Launceston Ti Tree Bend: 33 Deg C, Dalby Airport: 37 Deg C, for all other selected weather stations: 39 Deg C.

AEMO requests Market Participants to:

1. review the weather forecast in the local area where their generating units / MNSP converter stations are located and,

2. if required, update the available capacity in their dispatch offers or availability submissions consistent with the forecast temperatures.

Further information is available at:

https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/nem-forecasting-and-planning/forecasting-and-reliability/projected-assessment-of-system-adequacy/nem-local-temperature-alerts

AEMO Operations Planning

AEMO ELECTRICITY MARKET NOTICE

Transgrid has advised AEMO of an new voltage stability limit in south-west NSW for loss of Lower Tumut to Wagga (051) 330 kV line. AEMO has now completed the review and testing of this new constraint equation and will implement the following constraint equation in AEMOS Production systems at 0900hrs Monday 8th December 2025.
N::N_NIL_WGLT

This constraint equations includes the generators in southern NSW on the left-hand side as well as Murraylink and VNI.

For full details on the formulation, the new constraint equation has now been loaded into AEMO's pre-production systems.

Ben Blake
AEMO Operations

AEMO ELECTRICITY MARKET NOTICE

AEMO's weather service provider has issued forecast temperatures equal to or greater than the NEM Local Temperature Alert Levels for listed weather stations below.

NSW
Deniliquin Ap (39+ Deg C): 5th Dec
Mudgee Ap (39+ Deg C): 6th Dec

QLD
Dalby Ap (37+ Deg C): 7th Dec

SA
Port Augusta Ap (39+ Deg C): 4th Dec, 5th Dec

The NEM Local Temperature Alert Levels are:

Launceston Ti Tree Bend: 33 Deg C, Dalby Airport: 37 Deg C, for all other selected weather stations: 39 Deg C.

AEMO requests Market Participants to:

1. review the weather forecast in the local area where their generating units / MNSP converter stations are located and,

2. if required, update the available capacity in their dispatch offers or availability submissions consistent with the fore-cast temperatures.

Further information is available at:

https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/nem-forecasting-and-planning/forecasting-and-reliability/projected-assessment-of-system-adequacy/nem-local-temperature-alerts

AEMO Operations Planning

AEMO ELECTRICITY MARKET NOTICE

AEMO's weather service provider has issued forecast temperatures equal to or greater than the NEM Local Temperature Alert Levels for listed weather stations below.

NSW
Lake Macquarie (39+ Deg C): 6th Dec
Mudgee Ap (39+ Deg C): 6th Dec

QLD
Dalby Ap (37+ Deg C): 7th Dec

SA
Port Augusta Ap (39+ Deg C): 4th Dec

The NEM Local Temperature Alert Levels are:

Launceston Ti Tree Bend: 33 Deg C, Dalby Airport: 37 Deg C, for all other selected weather stations: 39 Deg C.

AEMO requests Market Participants to:

1. review the weather forecast in the local area where their generating units / MNSP converter stations are located and,

2. if required, update the available capacity in their dispatch offers or availability submissions consistent with the fore-cast temperatures.

Further information is available at:

https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/nem-forecasting-and-planning/forecasting-and-reliability/projected-assessment-of-system-adequacy/nem-local-temperature-alerts

AEMO Operations Planning

AEMO ELECTRICITY MARKET NOTICE

AEMO's weather service provider has issued forecast temperatures equal to or greater than the NEM Local Tem-perature Alert Levels for listed weather stations below.

NSW
Lake Macquarie (39+ Deg C): 6th Dec
Mudgee Ap (39+ Deg C): 6th Dec

SA
Port Augusta Ap (39+ Deg C): 4th Dec

The NEM Local Temperature Alert Levels are:

Launceston Ti Tree Bend: 33 Deg C, Dalby Airport: 37 Deg C, for all other selected weather stations: 39 Deg C.

AEMO requests Market Participants to:

1. review the weather forecast in the local area where their generating units / MNSP converter stations are lo-cated and,

2. if required, update the available capacity in their dispatch offers or availability submissions consistent with the forecast temperatures.

Further information is available at:

https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/nem-forecasting-and-planning/forecasting-and-reliability/projected-assessment-of-system-adequacy/nem-local-temperature-alerts

AEMO Operations Planning