Monday 28 September 2026
Trading day 2026-09-28
SA records 12.7 hours of negative prices as NEM averages $51.70
NSW recorded the highest average price at $72.80/MWh, followed by QLD at $67.90/MWh. SA averaged $34.50/MWh and reached a maximum of $358.60/MWh at 08:40. VIC averaged $33.70/MWh with 6.5 hours of negative prices, while TAS averaged $38.30/MWh with 5.2 negative hours.
NSW demand peaked at 9232 MW at 18:35, and QLD reached 7717 MW at 18:30. Coal contributed 46.6 per cent of the generation mix, wind provided 18.5 per cent, and rooftop solar added 15.2 per cent. Batteries discharged 16,004 MWh with a net output of 1055 MWh.
FCAS costs were highest for regulation services, with raise regulation costing $36,940 and lower regulation costing $21,847. Total emissions were 284,936 tonnes of carbon dioxide, up 7.5 per cent from the same weekday last week.
AEMO's notice at 14:23 stated a foreseeable intervention under clause 4.8.5A (a) of the NER in the SA region.
Today · Pre-dispatch forecasts show QLD reaching $319.04/MWh at 19:30 and SA reaching $145.00/MWh at 18:30.
In context · The NEM average of $51.70/MWh was below the seven-day average of $61.80/MWh, ranking fifth for the week. The SA average of $34.50/MWh was below its seven-day average of $53.60/MWh and lower than the $41.94/MWh recorded last Monday.
Prices
Trading day · 04:00 → 04:00 AEST · 30-min average
| Region | Avg | VWAP | Min | Max | Neg | Cap |
|---|---|---|---|---|---|---|
| NSW | $73 | $74 | $15 | $100 | 0 | 0 |
| QLD | $68 | $69 | $15 | $103 | 0 | 0 |
| SA | $34 | $47 | -$58 | $359 | 152 | 0 |
| VIC | $34 | $39 | -$21 | $97 | 78 | 0 |
| TAS | $38 | $41 | -$22 | $92 | 62 | 0 |
Min · Max are 5-minute dispatch extremes; the price chart plots 30-minute averages, so its peak reads lower.
Demand
FCAS
| Service | Cost | Spikes | Peak | When |
|---|---|---|---|---|
| RAISEREG | $5,120 | 0 | $11 | 28 Sept, 23:40 |
| LOWERREG | $1,800 | 0 | $4 | 28 Sept, 04:15 |
| RAISE6SEC | $145 | 0 | $0 | 28 Sept, 05:35 |
| RAISE60SEC | $129 | 0 | $0 | 28 Sept, 05:35 |
| LOWER60SEC | $96 | 0 | $0 | 28 Sept, 15:30 |
| LOWER5MIN | $41 | 0 | $0 | 28 Sept, 11:30 |
| RAISE5MIN | $40 | 0 | $0 | 28 Sept, 09:00 |
| LOWER6SEC | $38 | 0 | $0 | 28 Sept, 15:30 |
| Total | $7,409 | |||
Cost = NSW RRP × cleared MW per 5-min interval.
| Service | Cost | Spikes | Peak | When |
|---|---|---|---|---|
| RAISEREG | $6,948 | 0 | $11 | 28 Sept, 23:40 |
| LOWERREG | $2,731 | 0 | $4 | 28 Sept, 04:15 |
| RAISE6SEC | $313 | 0 | $0 | 28 Sept, 05:35 |
| LOWER60SEC | $292 | 0 | $0 | 28 Sept, 15:30 |
| RAISE60SEC | $234 | 0 | $0 | 28 Sept, 05:35 |
| LOWER5MIN | $66 | 0 | $0 | 28 Sept, 11:30 |
| LOWER6SEC | $49 | 0 | $0 | 28 Sept, 15:30 |
| RAISE5MIN | $47 | 0 | $0 | 28 Sept, 09:00 |
| Total | $10,679 | |||
Cost = QLD RRP × cleared MW per 5-min interval.
| Service | Cost | Spikes | Peak | When |
|---|---|---|---|---|
| RAISEREG | $10,695 | 0 | $11 | 28 Sept, 23:40 |
| LOWERREG | $1,929 | 0 | $4 | 28 Sept, 04:15 |
| RAISE60SEC | $366 | 0 | $0 | 28 Sept, 05:35 |
| RAISE6SEC | $357 | 0 | $0 | 28 Sept, 05:35 |
| LOWER60SEC | $111 | 0 | $0 | 28 Sept, 15:30 |
| RAISE5MIN | $108 | 0 | $0 | 28 Sept, 09:00 |
| LOWER6SEC | $35 | 0 | $0 | 28 Sept, 15:30 |
| LOWER5MIN | $30 | 0 | $0 | 28 Sept, 11:30 |
| Total | $13,632 | |||
Cost = VIC RRP × cleared MW per 5-min interval.
| Service | Cost | Spikes | Peak | When |
|---|---|---|---|---|
| RAISEREG | $4,833 | 0 | $11 | 28 Sept, 23:40 |
| LOWERREG | $3,454 | 0 | $4 | 28 Sept, 04:15 |
| RAISE6SEC | $286 | 0 | $0 | 28 Sept, 05:35 |
| RAISE60SEC | $248 | 0 | $0 | 28 Sept, 05:35 |
| LOWER60SEC | $151 | 0 | $0 | 28 Sept, 15:30 |
| LOWER6SEC | $68 | 0 | $0 | 28 Sept, 15:30 |
| LOWER5MIN | $53 | 0 | $0 | 28 Sept, 11:30 |
| RAISE5MIN | $52 | 0 | $0 | 28 Sept, 09:00 |
| Total | $9,144 | |||
Cost = SA RRP × cleared MW per 5-min interval.
| Service | Cost | Spikes | Peak | When |
|---|---|---|---|---|
| LOWERREG | $11,933 | 0 | $75 | 28 Sept, 09:30 |
| RAISEREG | $9,344 | 0 | $36 | 28 Sept, 15:50 |
| RAISE6SEC | $836 | 0 | $1 | 28 Sept, 17:25 |
| RAISE60SEC | $827 | 0 | $0 | 28 Sept, 04:05 |
| LOWER6SEC | $226 | 0 | $3 | 28 Sept, 23:05 |
| LOWER60SEC | $207 | 0 | $1 | 28 Sept, 17:10 |
| RAISE5MIN | $10 | 0 | $0 | 28 Sept, 18:15 |
| LOWER5MIN | $0 | 0 | $0 | 28 Sept, 11:30 |
| Total | $23,383 | |||
Cost = TAS RRP × cleared MW per 5-min interval.
Battery dispatch
Peak moment
Fleet discharged 1,378 MW at 18:30 as NSW spot hit $88/MWh.
Peak moment
Fleet discharged 994 MW at 18:30 as QLD spot hit $85/MWh.
Peak moment
Fleet discharged 977 MW at 19:00 as VIC spot hit $86/MWh.
Peak moment
Fleet discharged 452 MW at 19:00 as SA spot hit $81/MWh.
Peak moment
Fleet discharged 3,744 MW at 18:30 as TAS spot hit $83/MWh.
Fleet net dispatch · spot-price overlay · 30-min average
Regional dispatch ranking
| Region | Discharged | Net |
|---|---|---|
#1VIC | 5,198MWh | +649 |
#2NSW | 4,853MWh | +743 |
#3QLD | 4,070MWh | -391 |
#4SA | 1,885MWh | +53 |
Generation Mix
- Coal50.7% · 100.8 GWh
- Gas0.9% · 1.8 GWh
- Hydro3.8% · 7.5 GWh
- Wind15.0% · 29.7 GWh
- Solar (utility)13.8% · 27.4 GWh
- Solar (rooftop)12.4% · 24.7 GWh
- Battery2.4% · 4.9 GWh
- Other0.9% · 1.8 GWh
- Coal55.8% · 105.6 GWh
- Gas2.3% · 4.4 GWh
- Hydro1.1% · 2.0 GWh
- Wind13.1% · 24.8 GWh
- Solar (utility)11.1% · 21.0 GWh
- Solar (rooftop)14.1% · 26.7 GWh
- Battery2.2% · 4.1 GWh
- Other0.3% · 0.6 GWh
- Coal50.7% · 82.6 GWh
- Hydro0.5% · 0.8 GWh
- Wind19.4% · 31.6 GWh
- Solar (utility)8.4% · 13.7 GWh
- Solar (rooftop)17.5% · 28.4 GWh
- Battery3.2% · 5.2 GWh
- Other0.4% · 0.7 GWh
- Gas6.0% · 2.8 GWh
- Wind59.1% · 27.3 GWh
- Solar (utility)3.3% · 1.5 GWh
- Solar (rooftop)27.5% · 12.7 GWh
- Battery4.1% · 1.9 GWh
- Other0.1% · 0.1 GWh
- Gas13.1% · 3.1 GWh
- Hydro72.8% · 17.0 GWh
- Wind5.4% · 1.3 GWh
- Solar (rooftop)8.7% · 2.0 GWh
Renewables
- NSW 43.8%
- VIC 51.4%
- QLD 44.7%
- SA 104.4%
- TAS 68.1%
Interconnectors
| Region (proxy) | Net flow | Direction changes | Hours at limit |
|---|---|---|---|
| N-Q-MNSP1 | +23.2 GWh | 2 | — |
| NSW1-QLD1 | −32.0 GWh | 16 | — |
| VIC1-NSW1 | +12.8 GWh | 26 | — |
| V-SA | +11.7 GWh | 10 | — |
| T-V-MNSP1 | −12.3 GWh | 2 | — |
Per-region net of NETINTERCHANGE proxied to a representative interconnector. Full per-interconnector decomposition + hours-at-limit needs DINTERCONNECTOR parsing (follow-up).
Emissions
| NSW | 88.9k tCO₂ | 0.446 tCO₂/MWh |
| QLD | 94.9k tCO₂ | 0.499 tCO₂/MWh |
| SA | 1.4k tCO₂ | 0.030 tCO₂/MWh |
| VIC | 97.9k tCO₂ | 0.596 tCO₂/MWh |
| TAS | 1.8k tCO₂ | 0.080 tCO₂/MWh |