South West Interconnected System: Evening ramp
reference4.5% higher on the retained basis.
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NEM and SWIS operating conditions in one fixed release, with every metric kept on its native market, unit and measurement basis.
Edition read
53 publishable metric rows across 2 Australian grid systems, with measurement bases retained for every value.
Reading boundary
The NEM chart uses five-minute regional price spreads. SWIS is excluded because this edition does not yet carry a directly comparable WEM price series.
| Market | Metric | Edition value | Change | Evidence | Vintage |
|---|---|---|---|---|---|
| New South WalesNSW1 | Annual production carbon intensity National annual production-based electricity carbon intensity, 2025 | 525 gCO2/kWh | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| New South WalesNSW1 | Annual renewable share National annual electricity generation share, 2025 | 38.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| New South WalesNSW1 | Annual solar share National annual electricity generation share, 2025 | 19.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| New South WalesNSW1 | Annual variable renewable share National annual electricity generation share, 2025 | 33.3 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| New South WalesNSW1 | Average demand AEMO regional daily mean operational demand | 8,099 MW | -6.1% / prior 30 days | observedHigh | AEMO-NEM-2026-08-30 |
| New South WalesNSW1 | Evening ramp Midday minimum to evening maximum demand | 3,927 MW | 0.2% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| New South WalesNSW1 | Negative-price interval share Share of NEM five-minute regional price intervals below zero | 8.33 % | Not available | derivedMedium | AEMO-NEM-2026-05-31 |
| New South WalesNSW1 | Average spot price NEM five-minute regional reference price, daily mean | 76 AUD/MWh | -8.7% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| New South WalesNSW1 | Daily price spread NEM five-minute regional daily maximum less minimum | 135 AUD/MWh | -12.8% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| QueenslandQLD1 | Annual production carbon intensity National annual production-based electricity carbon intensity, 2025 | 525 gCO2/kWh | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| QueenslandQLD1 | Annual renewable share National annual electricity generation share, 2025 | 38.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| QueenslandQLD1 | Annual solar share National annual electricity generation share, 2025 | 19.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| QueenslandQLD1 | Annual variable renewable share National annual electricity generation share, 2025 | 33.3 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| QueenslandQLD1 | Average demand AEMO regional daily mean operational demand | 5,837 MW | -3.5% / prior 30 days | observedHigh | AEMO-NEM-2026-08-30 |
| QueenslandQLD1 | Evening ramp Midday minimum to evening maximum demand | 3,461 MW | 3.5% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| QueenslandQLD1 | Negative-price interval share Share of NEM five-minute regional price intervals below zero | 8.33 % | -57.1% / prior observation | derivedMedium | AEMO-NEM-2026-05-31 |
| QueenslandQLD1 | Average spot price NEM five-minute regional reference price, daily mean | 60.7 AUD/MWh | -8.0% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| QueenslandQLD1 | Daily price spread NEM five-minute regional daily maximum less minimum | 142 AUD/MWh | 5.5% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| South AustraliaSA1 | Annual production carbon intensity National annual production-based electricity carbon intensity, 2025 | 525 gCO2/kWh | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| South AustraliaSA1 | Annual renewable share National annual electricity generation share, 2025 | 38.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| South AustraliaSA1 | Annual solar share National annual electricity generation share, 2025 | 19.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| South AustraliaSA1 | Annual variable renewable share National annual electricity generation share, 2025 | 33.3 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| South AustraliaSA1 | Average demand AEMO regional daily mean operational demand | 1,422 MW | -8.5% / prior 30 days | observedHigh | AEMO-NEM-2026-08-30 |
| South AustraliaSA1 | Evening ramp Midday minimum to evening maximum demand | 1,157 MW | 3.3% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| South AustraliaSA1 | Negative-price interval share Share of NEM five-minute regional price intervals below zero | 23.3 % | 378.6% / prior observation | derivedMedium | AEMO-NEM-2026-05-31 |
| South AustraliaSA1 | Average spot price NEM five-minute regional reference price, daily mean | 72 AUD/MWh | -29.9% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| South AustraliaSA1 | Daily price spread NEM five-minute regional daily maximum less minimum | 200 AUD/MWh | -80.9% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| TasmaniaTAS1 | Annual production carbon intensity National annual production-based electricity carbon intensity, 2025 | 525 gCO2/kWh | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| TasmaniaTAS1 | Annual renewable share National annual electricity generation share, 2025 | 38.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| TasmaniaTAS1 | Annual solar share National annual electricity generation share, 2025 | 19.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| TasmaniaTAS1 | Annual variable renewable share National annual electricity generation share, 2025 | 33.3 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| TasmaniaTAS1 | Average demand AEMO regional daily mean operational demand | 1,107 MW | -6.8% / prior 30 days | observedHigh | AEMO-NEM-2026-08-30 |
| TasmaniaTAS1 | Evening ramp Midday minimum to evening maximum demand | 365 MW | 17.9% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| TasmaniaTAS1 | Negative-price interval share Share of NEM five-minute regional price intervals below zero | 0 % | Not available | derivedMedium | AEMO-NEM-2026-05-31 |
| TasmaniaTAS1 | Average spot price NEM five-minute regional reference price, daily mean | 58.1 AUD/MWh | -23.6% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| TasmaniaTAS1 | Daily price spread NEM five-minute regional daily maximum less minimum | 151 AUD/MWh | -91.1% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| VictoriaVIC1 | Annual production carbon intensity National annual production-based electricity carbon intensity, 2025 | 525 gCO2/kWh | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| VictoriaVIC1 | Annual renewable share National annual electricity generation share, 2025 | 38.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| VictoriaVIC1 | Annual solar share National annual electricity generation share, 2025 | 19.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| VictoriaVIC1 | Annual variable renewable share National annual electricity generation share, 2025 | 33.3 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| VictoriaVIC1 | Average demand AEMO regional daily mean operational demand | 5,902 MW | -8.3% / prior 30 days | observedHigh | AEMO-NEM-2026-08-30 |
| VictoriaVIC1 | Evening ramp Midday minimum to evening maximum demand | 2,637 MW | 1.1% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| VictoriaVIC1 | Negative-price interval share Share of NEM five-minute regional price intervals below zero | 26.4 % | 660.0% / prior observation | derivedMedium | AEMO-NEM-2026-05-31 |
| VictoriaVIC1 | Average spot price NEM five-minute regional reference price, daily mean | 60.4 AUD/MWh | -22.0% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| VictoriaVIC1 | Daily price spread NEM five-minute regional daily maximum less minimum | 150 AUD/MWh | -84.4% / prior 30 days | derivedMedium | AEMO-NEM-2026-08-30 |
| Market | Metric | Edition value | Change | Evidence | Vintage |
|---|---|---|---|---|---|
| South West Interconnected SystemSWIS | Annual production carbon intensity National annual production-based electricity carbon intensity, 2025 | 525 gCO2/kWh | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| South West Interconnected SystemSWIS | Annual renewable share National annual electricity generation share, 2025 | 38.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| South West Interconnected SystemSWIS | Annual solar share National annual electricity generation share, 2025 | 19.6 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| South West Interconnected SystemSWIS | Annual variable renewable share National annual electricity generation share, 2025 | 33.3 % | Not available | contextHigh | OWID Energy Dataset 2025 annual series |
| South West Interconnected SystemSWIS | Minimum operational demand AEMO SWIS daily minimum operational demand | 1,624 MW | -9.9% / prior 30 days | observedHigh | AEMO-WEM-2026-08-29 |
| South West Interconnected SystemSWIS | Evening ramp Daily minimum to evening operational-demand maximum | 1,367 MW | 4.5% / prior 30 days | derivedMedium | AEMO-WEM-2026-08-29 |
| South West Interconnected SystemSWIS | Estimated rooftop solar peak AEMO estimated distributed PV daily maximum | 1,582 MW | 9.4% / prior 30 days | observedHigh | AEMO-WEM-2026-08-29 |
| South West Interconnected SystemSWIS | Rooftop solar share at peak Estimated DPV divided by underlying-demand proxy at DPV peak | 46.1 % | 10.8% / prior 30 days | derivedMedium | AEMO-WEM-2026-08-29 |
Change ledger
4.5% higher on the retained basis.
3.5% higher on the retained basis.
A prior comparable value is not available.
A prior comparable value is not available.
1.1% higher on the retained basis.
3.3% higher on the retained basis.
0.2% higher on the retained basis.
3.5% lower on the retained basis.
9.9% lower on the retained basis.
8.5% lower on the retained basis.
9.4% higher on the retained basis.
6.8% lower on the retained basis.
Machine-readable edition
Metric key, unit and comparison basis must all match. National annual context remains labelled as context and is not relabelled as regional real-time data. A missing value remains null and is never converted to zero.