As noted in this ‘(Initial) Replay of Thursday evening 17th October 2024 in SA’, the Snowtown 1 Wind Farm came sharply offline in the 18:45 dispatch interval (NEM time) on Thursday 17th October 2024.
Curiosity drove me to open the ‘Unit Dashboard’ widget for that unit this morning at the 09:05 dispatch interval and we see that the unit’s just come back online this morning .. so after >12 hours offline:
We can see that the unit had commenced the process for coming back online at the end of the 08:25 dispatch interval this morning (i.e. FinalMW for that dispatch interval at 2MW before a larger increase to 08:30).
Drilling into the three dispatch intervals surrounding the unit trip last night at 18:45 we see the following:
Briefly:
1) At 18:40 the unit achieves a small ‘Dispatch Error’ by landing close to the (non-SDC) Target, which was produced from the Self-Forecast
2) At 18:45:
(a) For reasons not explored here, the autobidder shifts volume from –$1,000/MWh at the RRN to a ‘negative LGC’ price band
… but that’s inconsequential in terms of the dispatch outcome
(b) The unit trips offline unexpectedly, hence the ‘Dispatch Error’ of +85MW
… positive numbers for ‘Dispatch Error’ (and ‘Raw Off-Target’, if calculating further) are underperformance
3) At 18:50:
(a) The self-forecast deployed on this unit reacts quickly and resets the unit’s Availability to 0MW.
(b) We’ve also noted that there’s no rebid of MaxAvail to 0MW at this time.
Not shown here, but I’ve quickly looked at the rebid reasons for the past 24 hours for this unit to see if they would shed some light on why the unit was offline … but nothing visible there.
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