Less than an hour ago, we noted how ‘AEMO issues directions to units at Jeeralang Power Station, for System Strength in Victoria (Wednesday 15th October 2025)’ … with respect to yesterday’s ‘AEMO flags possible intervention tomorrow (Wed 15th Oct 2025) for System Strength in Victoria’.
However, at 08:41 the AEMO issued three follow-on instructions to cancel those notices, because it decided to direct Murray to operate in synchronous condenser mode at two units, as follows (though note that this, also, seems to have been short-lived?!) ….
MURR2-3 MURRAY2 | MURR2-2 MURRAY2 |
---|---|
Firstly there was via MN129616 at 08:49: ‘——————————————————————- From : AEMO ——————————————————————- Notice ID : 129616 ——————————————————————- Reason : AEMO ELECTRICITY MARKET NOTICE Direction – VIC region to Snowy Hydro Limited – MURR2-3 MURRAY2 Refer to Market Notice 129599 In accordance with section 116 of the National Electricity Law, AEMO is issuing a direction to Snowy Hydro Limited. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a1)(1). Direction issued to: Snowy Hydro Limited – MURR2-3 MURRAY2 at 0845 hrs 15/10/2025 Snowy Hydro Limited does not incur any civil monetary liability for a relevant action taken in accordance with this direction unless the action is taken in bad faith. Manager NEM Real Time Operations ——————————————————————- |
… and then there was MN129617 at 08:49:
‘——————————————————————- From : AEMO ——————————————————————- Notice ID : 129617 ——————————————————————- Reason : AEMO ELECTRICITY MARKET NOTICE Direction – VIC region to Snowy Hydro Limited – MURR2-2 MURRAY2 Refer to Market Notice 129599 In accordance with section 116 of the National Electricity Law, AEMO is issuing a direction to Snowy Hydro Limited. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a1)(1). Direction issued to: Snowy Hydro Limited – MURR2-2 MURRAY2 at 0845 hrs 15/10/2025 Snowy Hydro Limited does not incur any civil monetary liability for a relevant action taken in accordance with this direction unless the action is taken in bad faith. Manager NEM Real Time Operations ——————————————————————- |
But these directions were also cancelled … though not sure what replaced them?
However, about an hour later, there were a series of Market Notices that suggested the above directions were cancelled. There were 3 x Market Notices issued in quick succession:
MURR2-3 MURRAY2 | MURR2-2 MURRAY2 |
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Firstly there was via MN129616 at 08:49: ‘——————————————————————- From : AEMO ——————————————————————- Notice ID : 129621 ——————————————————————- Reason : AEMO ELECTRICITY MARKET NOTICE Cancellation: Direction issued to: Snowy Hydro Limited – MURR2-3 MURRAY2 Refer to Market Notice 129616 Direction is cancelled from: 0933 hrs 15/10/2025 Manager NEM Real Time Operations ——————————————————————- |
At 09:42 there was MN129620 as follows:
‘——————————————————————- From : AEMO ——————————————————————- Notice ID : 129620 ——————————————————————- Reason : AEMO ELECTRICITY MARKET NOTICE Cancellation: Direction issued to: Snowy Hydro Limited – MURR2-2 MURRAY2 Refer to Market Notice 129617 Direction is cancelled from: 0933 hrs 15/10/2025 Manager NEM Real Time Operations ——————————————————————- |
… which was then followed with MN129623:
‘——————————————————————-
MARKET NOTICE
——————————————————————-
From : AEMO
To : NEMITWEB1
Creation Date : 15/10/2025 09:46:39
——————————————————————-
Notice ID : 129623
Notice Type ID : MARKET INTERVENTION
Notice Type Description : Reserve Contract / Direction / Instruction
Issue Date : 15/10/2025
External Reference : Cancellation – AEMO Intervention Event – VIC region 15/10/2025
——————————————————————-
Reason :
AEMO ELECTRICITY MARKET NOTICE
Cancellation – AEMO Intervention Event – VIC region 15/10/2025
Refer to Market Notice 129599
The AEMO Intervention Event and all associated directions are cancelled from 0933 hrs on 15/10/2025.
Manager NEM Real Time Operations
——————————————————————-
END OF REPORT
——————————————————————-‘
In this case, however, I am not sure what provisions were put in place to provide for System Strength:
1) Given the earlier directions to Jeeralang had already cancelled at ~08:41; and
2) Given that LYA4 was now offline.
… or did the AEMO re-calculate and determine a boost was no longer required?
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