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144186CONSTRAINTS02/06/2026 02:03:25 PM
Increase in Heywood from SA to Vic test limit from 550 to 600 MW
AEMO ELECTRICITY MARKET NOTICE
AEMO will increase the Heywood test limit from SA to Vic (from the current 550 MW) to 600 MW today to conduct internetwork testing on Heywood.
The following constraint sets will be revoked once the testing criteria met:
I-SV_HEY_550_TEST
The following constraint sets will be invoked:
I-SV_HEY_600_TEST
AEMO will revert the Heywood test limit back to 550 MW once the test has completed while the test result being analysed.
Please also refer to the published formal PEC Stage 1 and HIC capacity release testing information at the following link: https://aemo.com.au/-/media/files/stakeholder_consultation/consultations/nem-consultations/2023/project-energyconnect-stage-1-and-hic-capacity-release/pec-stage-1-and-hic---final-test-program.pdf?la=en.
Terry Liu
AEMO Operations
AEMO will increase the Heywood test limit from SA to Vic (from the current 550 MW) to 600 MW today to conduct internetwork testing on Heywood.
The following constraint sets will be revoked once the testing criteria met:
I-SV_HEY_550_TEST
The following constraint sets will be invoked:
I-SV_HEY_600_TEST
AEMO will revert the Heywood test limit back to 550 MW once the test has completed while the test result being analysed.
Please also refer to the published formal PEC Stage 1 and HIC capacity release testing information at the following link: https://aemo.com.au/-/media/files/stakeholder_consultation/consultations/nem-consultations/2023/project-energyconnect-stage-1-and-hic-capacity-release/pec-stage-1-and-hic---final-test-program.pdf?la=en.
Terry Liu
AEMO Operations
144142CONSTRAINTS25/05/2026 02:50:50 PM
Updated system normal constraints to manage Murraylink dynamic rating forecast in pre-dispatch and PASA
Refer to Market Notice 134696
AEMO has now completed the production of the Murraylink dynamic rating forecast model and the forecasting performance has been satisfactory during the test. AEMO will be enabling the pre-dispatch and PASA formulation using the Murraylink dynamic rating forecast on the following two constraint equations at 1000 hrs on Wednesday 27th May 2026.
VSML_RAT_LIM_DYN
SVML_RAT_LIM_DYN
For full details on the formulation, the updated constraint equations have now been loaded into AEMO's pre-production systems.
Terry Liu
AEMO Operations
AEMO has now completed the production of the Murraylink dynamic rating forecast model and the forecasting performance has been satisfactory during the test. AEMO will be enabling the pre-dispatch and PASA formulation using the Murraylink dynamic rating forecast on the following two constraint equations at 1000 hrs on Wednesday 27th May 2026.
VSML_RAT_LIM_DYN
SVML_RAT_LIM_DYN
For full details on the formulation, the updated constraint equations have now been loaded into AEMO's pre-production systems.
Terry Liu
AEMO Operations
144110MINIMUM SYSTEM LOAD17/05/2026 02:42:23 PM
Cancellation of [Forecast, Actual]Minimum System Load (MSL) MSL1 event in the SA Region on 17/05/2026.
AEMO ELECTRICITY MARKET NOTICE
Cancellation of [Forecast, Actual]Minimum System Load (MSL) MSL1 event in the SA Region on 17/05/2026.
Cancellation - [Forecast, Actual]MSL1- SA Region at 1430 hrs 17/05/2026.
Refer to Market Notice 144105for MSL1.
Manager NEM Real Time Operations
Cancellation of [Forecast, Actual]Minimum System Load (MSL) MSL1 event in the SA Region on 17/05/2026.
Cancellation - [Forecast, Actual]MSL1- SA Region at 1430 hrs 17/05/2026.
Refer to Market Notice 144105for MSL1.
Manager NEM Real Time Operations
144105MINIMUM SYSTEM LOAD17/05/2026 01:17:19 PM
Forecast Minimum System Load MSL1 condition in the SA Region on 17/05/2026
AEMO ELECTRICITY MARKET NOTICE
Forecast Minimum System Load MSL1 condition in the SA Region on 17/05/2026
AEMO has detected that there is an elevated risk of insufficient demand to maintain a secure operating state in the SA on 17/05/2026.
Minimum System Load (MSL) conditions are forecast when demand is less than the relevant MSL threshold. The advisory MSL thresholds are:
- MSL1: 603 MW
- MSL2: 328 MW
- MSL3: 113 MW
The demand is forecast to be below the MSL1 threshold for the following period[s]:
- From 1300 hrs 17/05/2026 to 1400 hrs 17/05/2026. Minimum demand is forecast to be 576 MW at 1400 hrs.
Forecast demand refers to forecast Operational Demand that excludes contribution from Significant Non-Scheduled Generation: see definitions at https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/data-nem/operational-demand-data .
AEMO is seeking a market response.
AEMO has not yet estimated the latest time it would need to intervene through an AEMO intervention event.
Manager NEM Real Time Operations
Forecast Minimum System Load MSL1 condition in the SA Region on 17/05/2026
AEMO has detected that there is an elevated risk of insufficient demand to maintain a secure operating state in the SA on 17/05/2026.
Minimum System Load (MSL) conditions are forecast when demand is less than the relevant MSL threshold. The advisory MSL thresholds are:
- MSL1: 603 MW
- MSL2: 328 MW
- MSL3: 113 MW
The demand is forecast to be below the MSL1 threshold for the following period[s]:
- From 1300 hrs 17/05/2026 to 1400 hrs 17/05/2026. Minimum demand is forecast to be 576 MW at 1400 hrs.
Forecast demand refers to forecast Operational Demand that excludes contribution from Significant Non-Scheduled Generation: see definitions at https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/data-nem/operational-demand-data .
AEMO is seeking a market response.
AEMO has not yet estimated the latest time it would need to intervene through an AEMO intervention event.
Manager NEM Real Time Operations
144083CONSTRAINTS15/05/2026 11:20:34 AM
Updated maximum generation contingency size in Victoria from 600 MW to 750 MW
VicGrid has conducted studies and determined that the maximum generation contingency size in Victoria can be increased from 600 MW to 750 MW.
This change affects the generator limitations for prior outage conditions especially in the South-west Victoria area. The new generation limitation for outages is now 750 MW. AEMO has implemented this change in production on 13th May 2026 by updating generation constraints to increase the generation upper limits for outage conditions.
Please refer to the Network Outage Schedule for any upcoming outages in south-west Victoria here.
https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/data-nem/network-data/network-outage-schedule
For further details on this change please refer to VicGrid Limits Advice or contact VicGrid.
vicgrid.com.au/transmission-planning/planning-the-energy-grid
Terry Liu
AEMO Operations
This change affects the generator limitations for prior outage conditions especially in the South-west Victoria area. The new generation limitation for outages is now 750 MW. AEMO has implemented this change in production on 13th May 2026 by updating generation constraints to increase the generation upper limits for outage conditions.
Please refer to the Network Outage Schedule for any upcoming outages in south-west Victoria here.
https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/data-nem/network-data/network-outage-schedule
For further details on this change please refer to VicGrid Limits Advice or contact VicGrid.
vicgrid.com.au/transmission-planning/planning-the-energy-grid
Terry Liu
AEMO Operations
141139MINIMUM SYSTEM LOAD18/04/2026 02:15:11 PM
Cancellation of ActualMinimum System Load (MSL) MSL1 event in the SA Region on 18/04/2026.
AEMO ELECTRICITY MARKET NOTICE
Cancellation of ActualMinimum System Load (MSL) MSL1 event in the SA Region on 18/04/2026.
Cancellation - ActualMSL1- SA Region at 1405 hrs 18/04/2026.
Refer to Market Notice 141138 for MSL1.
Manager NEM Real Time Operations
Cancellation of ActualMinimum System Load (MSL) MSL1 event in the SA Region on 18/04/2026.
Cancellation - ActualMSL1- SA Region at 1405 hrs 18/04/2026.
Refer to Market Notice 141138 for MSL1.
Manager NEM Real Time Operations
141138MINIMUM SYSTEM LOAD18/04/2026 12:35:23 PM
Actual Minimum System Load MSL1 condition in the SA Region on 18/04/2026
AEMO ELECTRICITY MARKET NOTICE
Actual Minimum System Load MSL1 condition in the SA Region on 18/04/2026
AEMO has detected that there is an elevated risk of insufficient demand to maintain a secure operating state in the SA on 18/04/2026.
The advisory MSL thresholds are:
- MSL1: 54 MW
- MSL2: -97 MW
- MSL3: -448 MW
The demand is below the MSL1 threshold.
Demand refers to Operational Demand that excludes contribution from Significant Non-Scheduled Generation: see definitions at https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/data-nem/operational-demand-data .
Manager NEM Real Time Operations
Actual Minimum System Load MSL1 condition in the SA Region on 18/04/2026
AEMO has detected that there is an elevated risk of insufficient demand to maintain a secure operating state in the SA on 18/04/2026.
The advisory MSL thresholds are:
- MSL1: 54 MW
- MSL2: -97 MW
- MSL3: -448 MW
The demand is below the MSL1 threshold.
Demand refers to Operational Demand that excludes contribution from Significant Non-Scheduled Generation: see definitions at https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/data-nem/operational-demand-data .
Manager NEM Real Time Operations
140916MINIMUM SYSTEM LOAD04/04/2026 01:52:03 PM
Cancellation of Actual Minimum System Load (MSL) MSL1 event in the SA Region on 04/04/2026.
AEMO ELECTRICITY MARKET NOTICE
Cancellation of Actual Minimum System Load (MSL) MSL1 event in the SA Region on 04/04/2026.
Cancellation - Actual MSL1- SA Region at 1350 hrs 04/04/2026.
Refer to Market Notice 140894 for MSL1.
Manager NEM Real Time Operations
Cancellation of Actual Minimum System Load (MSL) MSL1 event in the SA Region on 04/04/2026.
Cancellation - Actual MSL1- SA Region at 1350 hrs 04/04/2026.
Refer to Market Notice 140894 for MSL1.
Manager NEM Real Time Operations
140894MINIMUM SYSTEM LOAD04/04/2026 12:43:13 PM
Actual Minimum System Load MSL1 condition in the SA Region on 04/04/2026
AEMO ELECTRICITY MARKET NOTICE
Actual Minimum System Load MSL1 condition in the SA Region on 04/04/2026
AEMO has detected that there is an elevated risk of insufficient demand to maintain a secure operating state in the SA on 04/04/2026.
The advisory MSL thresholds are:
- MSL1: 68 MW
- MSL2: -83 MW
- MSL3: -344 MW
The demand is below the MSL1 threshold.
Demand refers to Operational Demand that excludes contribution from Significant Non-Scheduled Generation: see definitions at https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/data-nem/operational-demand-data .
Manager NEM Real Time Operations
Actual Minimum System Load MSL1 condition in the SA Region on 04/04/2026
AEMO has detected that there is an elevated risk of insufficient demand to maintain a secure operating state in the SA on 04/04/2026.
The advisory MSL thresholds are:
- MSL1: 68 MW
- MSL2: -83 MW
- MSL3: -344 MW
The demand is below the MSL1 threshold.
Demand refers to Operational Demand that excludes contribution from Significant Non-Scheduled Generation: see definitions at https://aemo.com.au/energy-systems/electricity/national-electricity-market-nem/data-nem/operational-demand-data .
Manager NEM Real Time Operations