SWIS evening ramp reached a new record

Operational demand rose 2385 MW from the daily minimum to the evening peak, exceeding the previous 2362 MW record.

Market

SWIS

Observed

22 December 2024

Triggered value

2,385 MW

Severity

extreme

Executive read

What changed

Measurement. Evening operational ramp reached 2,385 MW against a 2,362 MW reference.

Decision implication. A steeper ramp raises the quantity and speed of dispatchable response required as rooftop solar output falls away.

Evidence boundary. The event is a deterministic threshold or record comparison. It identifies a measurement that warrants investigation; it does not assign causality or quantify commercial exposure.

Operating context

Prior-window average

1,550 MW

Event observation

2,385 MW

Post-event average

1,608 MW

Event-day energy mix

Coal36.6% · 24,975 MWh

Gas34.9% · 23,796 MWh

Wind21.4% · 14,583 MWh

Other scheduled generation3.9% · 2,657 MWh

Utility solar3.2% · 2,152 MWh

Questions for the decision

What operating or market conditions coincided with this observation?
Was the value repeated, reversed or exceeded in the following days?
Which flexible resources, constraints or settlement exposures matter for the decision at hand?

Source trail

The measurement and context series are retained from the named primary operator or source release. Calculated shares and comparisons preserve the source boundary stated in the underlying Solar Analytica record.

https://data.wa.aemo.com.au/public/market-data/wemde/operationalDemandWithdrawal/dailyFiles/OperationalDemandAndWithdrawal_2024-12-22.json

Related precedents

2025-01-28SWIS evening ramp reached a new record2,412 MW

2023-11-21SWIS evening ramp reached a new record2,362 MW