Market Notices

82305GENERAL NOTICE22/01/2021 10:34:10 AM

NEM Local Temperature Alerts for SA, TAS, VIC from 22 Jan 2021 to 26 Jan 2021

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
Adelaide West Terrace (39+ Deg C): 24th Jan
Clare High School (39+ Deg C): 23rd Jan, 24th Jan
Mt Gambier Ap (39+ Deg C): 24th Jan
Port Augusta Ap (39+ Deg C): 22nd Jan, 23rd Jan, 24th Jan

TAS
Launceston Ti Tree Bend (33+ Deg C): 25th Jan

VIC
Latrobe Valley Ap (39+ Deg C): 25th Jan
Melbourne Olympic Park (39+ Deg C): 25th Jan
Mildura Ap (39+ Deg C): 23rd Jan, 24th Jan, 25th Jan

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
     
82272GENERAL NOTICE21/01/2021 01:43:58 PM

Re-rating of lines in Snowy mountains area at times of high temperatures

AEMO ELECTRICITY MARKET NOTICE

TransGrid has advised AEMO that a number of lines in the Snowy mountains have damaged conductors. To mitigate the risk of conductor failure when the temperature is >40C temperature and wind < 4km/hr the lines will have lower ratings applied in AEMO's systems.

The following constraint sets are available for the application of the revised ratings in pre-dispatch and ST PASA timeframes. In dispatch the dynamic / hand-dressed rating will be used.
N-RED-RAT-PD-ST-2
N-RED-RAT-PD-ST-3
N-RED-RAT-PD-ST-51
N-RED-RAT-PD-ST-65
N-RED-RAT-PD-ST-7

The process for the activation of these revised ratings is TransGrid will monitor forecast conditions at the Cabramurra and Khancoban weather stations and will advise AEMO to apply the revised ratings if the temperatures are forecast to exceed 40C with wind speed lower than 4km/hr. AEMO will then issue a market notice and invoke the constraint sets above.


For full details on the factors these constraint equations and the rating values (modelled as a constant term) are already in AEMO's production systems.

For further details please contact ben.blake@aemo.com.au or Michael.Bradbery@transgrid.com.au

Ben Blake
AEMO Operations
     
82271GENERAL NOTICE21/01/2021 10:25:37 AM

NEM Local Temperature Alerts for SA, VIC from 21 Jan 2021 to 25 Jan 2021

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
Adelaide West Terrace (39+ Deg C): 24th Jan
Clare High School (39+ Deg C): 23rd Jan, 24th Jan
Mt Gambier Ap (39+ Deg C): 24th Jan
Port Augusta Ap (39+ Deg C): 21st Jan, 23rd Jan, 24th Jan

VIC
Ararat Prison (39+ Deg C): 24th Jan
Latrobe Valley Ap (39+ Deg C): 25th Jan
Melbourne Olympic Park (39+ Deg C): 25th Jan
Mildura Ap (39+ Deg C): 22nd Jan, 23rd Jan, 24th Jan, 25th Jan

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
     
82270GENERAL NOTICE21/01/2021 06:55:56 AM

Planned outage of Moorabool - Haunted Gully and Haunted Gully - Tarrone 500 kV lines in the Victoria region from the 25 February 2021 - 3 March 2021

AEMO ELECTRICITY MARKET NOTICE

The Moorabool - Haunted Gully and Haunted Gully - Tarrone 500 kV lines in the Victoria (VIC) region is planned to be out of service from 25 February 2021 0500hrs - 3 March 2021 1730hrs.

A credible contingency event during this planned outage could cause synchronous separation of the South Australia (SA) region from the rest of the NEM. If separation occurs, load may be interrupted due to the operation of the Automatic Under Frequency Load Shedding (AUFLS) scheme in SA.

The credible separation contingency is managed as follows:

- When power transfer is from SA to Victoria, contingency lower FCAS will be sourced from SA.
- When power transfer is from Victoria to SA, due to the 47-52Hz island separation frequency band advised by the SA jurisdiction, contingency raise FCAS is not sourced in SA and the AUFLS scheme may respond to low frequency events.
- Power transfer will be restricted on Victoria - South Australia interconnector (Heywood interconnector) to manage system security following the loss of the next contingency.

Forecast capacity reserves in the SA region are currently sufficient to meet electricity demand during the planned outage.

The following constraint sets have been invoked for this outage:

I-VS_050
S-X_BC_CP
V-X_HG_ML_TR

Refer to AEMO Network Outage Schedule (NOS) for further details.

Diyoni Hoole
AEMO Operations
     
82258GENERAL NOTICE20/01/2021 10:49:07 AM

NEM Local Temperature Alerts for SA, VIC from 20 Jan 2021 to 24 Jan 2021

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
Adelaide West Terrace (39+ Deg C): 24th Jan
Clare High School (39+ Deg C): 23rd Jan, 24th Jan
Mt Gambier Ap (39+ Deg C): 24th Jan
Port Augusta Ap (39+ Deg C): 21st Jan, 23rd Jan, 24th Jan

VIC
Ararat Prison (39+ Deg C): 24th Jan
Mildura Ap (39+ Deg C): 23rd Jan, 24th Jan

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
     
82238GENERAL NOTICE19/01/2021 10:50:33 AM

NEM Local Temperature Alerts for SA, VIC from 19 Jan 2021 to 23 Jan 2021

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
Clare High School (39+ Deg C): 23rd Jan
Port Augusta Ap (39+ Deg C): 21st Jan, 23rd Jan

VIC
Mildura Ap (39+ Deg C): 23rd Jan

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
     
82217GENERAL NOTICE18/01/2021 11:15:13 AM

Reduction in load relief in Tasmanian region - 20th January 2021

AEMO ELECTRICITY MARKET NOTICE

Further to MN 80127 and 81890, on 20th January at 1000hrs AEMO will reduce the load relief used to determine FCAS requirements from 0.7% to 0.6% for the Tasmanian region. This will increase the amount of contingency FCAS enabled by AEMO in the Tasmanian region.

This change is a part of AEMO's review of frequency in the NEM. The Tasmanian load relief will be slowly reduced by 0.1% on a fortnightly basis from the current 1.0%. Details were provided to market participants in an industry teleconference on 4th December 2020. For more information refer to: https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/system-operations/ancillary-services/load-relief

There will be no change at this stage to the Mainland load relief.

The next change is planned for 3rd Februry 2021.

Ben Blake
AEMO Operations
     
82216GENERAL NOTICE18/01/2021 10:50:58 AM

NEM Local Temperature Alerts for SA from 18 Jan 2021 to 22 Jan 2021

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): 21st Jan, 22nd Jan

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
     
82179GENERAL NOTICE15/01/2021 05:17:49 PM

Optimisations to Automatic Generation Control (AGC) operation

AEMO ELECTRICITY MARKET NOTICE

As detailed in Market Notice 80959, from 9-17 December AEMO undertook adjustments to AGC area tuning in the mainland regions to better cater for changes to frequency conditions that have occurred over the last few months. These changes involved altering AGC's behaviour to better utilise available Regulation FCAS resources. Changes to AGC parameters covered AGC deadbands, minor adjustments to gains, changes to make integral ACE more persistent and enablement of basepoint adjustment.

On Monday 18 January AEMO will revert the changes to the AGC basepoint adjustment. This reversion may also involve minor adjustments to other AGC paraments as necessary for stable operation, but all other major parameters are intended to remain unchanged.

This work will not change Regulation FCAS constraint equations or individual generator AGC tuning.

Details of this AGC tuning will be reported as usual in AEMO's weekly frequency reports:
https://aemo.com.au/en/energy-systems/electricity/national-electricity-market-nem/system-operations/ancillary-services/frequency-and-time-deviation-monitoring

For further queries on AGC changes contact Matthew.Holmes@aemo.com.au

AEMO Operations
     
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