We’ve already noted that curtailment of rooftop PV in South Australia occurred on Sunday 13th, on Tuesday 15th, on Wednesday 14th, and on Thursday 15th November (i.e. yesterday):
1) I thought it was worth clarifying that this also happened on Monday 14th November (i.e. every day since the islanding on Saturday 12th November), we just did not have time to publish about it on the day;
2) But also note that there’s been no such DPV warnings in Market Notices at least thus far today – Friday 18th November 2022.
(A) About Monday 14th November
For our future reference, here’s the relevant Market Notices – working backwards from MN103126 at 13:05 on Monday 14th November:
________________________________________________________________________________________________
Notice ID 103126
Notice Type ID Subjects not covered in specific notices
Notice Type Description MARKET
Issue Date Monday, 14 November 2022
External Reference Distributed PV Contingency 3 (DPVC3) in the SA Region on 14/11/2022.
________________________________________________________________________________________________
AEMO ELECTRICITY MARKET NOTICE
Distributed PV curtailment is occurring in the SA region to maintain system security due to a Distributed PV Contingency condition.
The instruction to maintain demand above the required threshold is expected to end at 1630 hrs 14/11/2022.
Manager NEM Real Time Operations
… which followed the earlier DPV2 notice (MN103125) at 11:34 as follows:
________________________________________________________________________________________________
Notice ID 103125
Notice Type ID Subjects not covered in specific notices
Notice Type Description MARKET
Issue Date Monday, 14 November 2022
External Reference Distributed PV Contingency 2 (DPVC2) in the SA Region on 14/11/2022.
________________________________________________________________________________________________
AEMO ELECTRICITY MARKET NOTICE
AEMO has taken action(s) to maintain power system security in South Australia at 1130 hrs 14/11/2022 due to a forecast Distributed PV Contingency (DPVC) condition.
AEMO actions may include the recall of planned outages, a direction and/or instruction to scheduled and non-scheduled generation, and/or an instruction to maintain DPV generation below a secure DPV generation threshold.
Manager NEM Real Time Operations
… which in turn followed the earlier DPV1 notice (MN) at 22:10 on Sunday evening:
________________________________________________________________________________________________
Notice ID 103113
Notice Type ID Reserve Contract / Direction / Instruction
Notice Type Description MARKET
Issue Date Sunday, 13 November 2022
External Reference DPV Contingency 1 (DPVC1) in the SA Region on 14/11/2022
________________________________________________________________________________________________
AEMO ELECTRICITY MARKET NOTICE
AEMO has detected there is an elevated risk of the contingent disconnection of Distributed PV (DPV) with the loss of scheduled generation exceeding secure thresholds in the South Australia region from 1200 hrs to 1630 hrs 14/11/2022. The maximum forecast DPV contingency is 84 MW at 1330 hrs and the secure DPV contingency threshold is 80 MW.
AEMO is seeking a market response.
An insufficient market response may require AEMO to take action or intervene to maintain power system security in South Australia. This may result in action such as the direction of scheduled generation, curtailment of non-scheduled wind generation, and/or an instruction to maintain DPV generation below a secure DPV generation threshold.
AEMO estimates the latest time at which it may need to intervene through an AEMO intervention event is 1030 hrs on 14/11/2022.
Manager NEM Real Time Operations
(B) About (today) Friday 18th November
As we hit publish here this morning (at ~10:30 NEM time) there are not yet any of the similar notices … even at the DPV1 level.
This satellite image from the BOM published at 09:30 today NEM time might help to explain why:
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