NEM wind and solar curtailment by region
NEM wind and solar curtailment by region
Curtailment is wind and solar energy that was available but not dispatched. Every 5 minutes AEMO forecasts what each semi-scheduled wind and solar farm could generate, its unconstrained intermittent generation forecast (UIGF). When the farm is dispatched below that forecast, the difference is curtailed. This page sums that difference by month and region from October 2020, the first full month for which the warehouse holds the wind and solar split.
The dispatch data does not record why a farm was curtailed. It can be a network or system security limit, or the farm's own offer sitting above the market price (economic curtailment). The second chart splits curtailed energy by whether the regional price was below zero at the time, a first cut between the two that is not exact in either direction.
Use Region to switch between one region and the whole NEM.
Curtailment, last 12 complete months
Follows the Region control.
- curtailed, last 12 months
- the 12 months before
- of available wind and solar energy
- of it while the price was below $0
Curtailed energy each month, wind and solar
Curtailed energy each month, by regional price
Share of available wind and solar energy curtailed
Curtailed energy by region and year
Shows every region whatever the Region control says. The current year runs to the end of last month.
Build a dashboard like this
An AI agent built this page from a plain-English request using NEM Explorer, which holds AEMO market data from 2009 onward. The page re-runs its queries against the latest data each time it is opened. Ask for your own at chat.scadaminer.com, or connect Claude Code or another MCP client to NEM Explorer and have it save one for you. The request behind this page was close to:
Build me a dashboard of curtailed wind and solar energy per month in each NEM region, split by whether the price was negative, with a region filter.
Method, sources and caveats
Data is AEMO's DISPATCHREGIONSUM, joined to DISPATCHPRICE for the regional price, with INTERVENTION = 0, in NEM time (UTC+10). For each region and 5-minute interval, curtailed wind is SS_WIND_UIGF minus SS_WIND_CLEAREDMW, floored at zero, and likewise for solar; energy is MW × 5/60. The share curtailed divides by the summed UIGF.
Only semi-scheduled wind and solar is counted. Non-scheduled farms and rooftop solar are not dispatched and do not appear. A farm dispatched below its UIGF because it offered less availability than the forecast, or because of a ramp limit, also counts as curtailed here.
The current, part-finished month is left out.
Contains material sourced from AEMO. SCADA Miner transforms and analyses the source material; results are not endorsed by AEMO.