Event Database

Market Event History

Searchable database of Australian energy market events — price spikes, negative pricing, record renewable generation, and major grid constraints. Each event is enriched with AI-generated causal analysis.

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TAS

high_renewableTASminor23 Apr 2026, 05:35 pm

High renewable penetration in TAS1: 100.0%

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Constraint EventNEMmoderate23 Apr 2026, 01:40 pm

High-value binding constraint in NEM: F_S+SETB_L1 ($990 shadow price)

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high_renewableTASminor22 Apr 2026, 05:25 pm

High renewable penetration in TAS1: 100.0%

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Constraint EventNEMmajor22 Apr 2026, 12:50 pm

High-value binding constraint in NEM: F_Q+8E_L1 ($8451 shadow price)

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Constraint EventTASmajor21 Apr 2026, 05:00 pm

High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price)

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high_renewableTASminor21 Apr 2026, 04:30 pm

High renewable penetration in TAS1: 100.0%

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Constraint EventTASmajor20 Apr 2026, 06:40 pm

High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price)

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Constraint EventNEMmajor20 Apr 2026, 05:30 pm

High-value binding constraint in NEM: F_Q+8E_L1 ($182700 shadow price)

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high_renewableTASminor20 Apr 2026, 04:30 pm

High renewable penetration in TAS1: 100.0%

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Constraint EventTASmajor20 Apr 2026, 05:45 am

High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price)

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Constraint EventTASmajor19 Apr 2026, 08:10 pm

High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price)

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high_renewableTASminor19 Apr 2026, 04:30 pm

High renewable penetration in TAS1: 100.0%

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high_renewableTASminor18 Apr 2026, 04:30 pm

High renewable penetration in TAS1: 100.0%

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high_renewableTASminor17 Apr 2026, 04:30 pm

High renewable penetration in TAS1: 100.0%

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high_renewableTASminor16 Apr 2026, 04:00 pm

High renewable penetration in TAS1: 100.0%

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Constraint EventTASmajor15 Apr 2026, 09:50 pm

High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price)

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high_renewableTASminor15 Apr 2026, 04:00 pm

High renewable penetration in TAS1: 100.0%

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Constraint EventTASmajor14 Apr 2026, 04:50 pm

High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price)

high_renewableTASminor14 Apr 2026, 03:30 pm

High renewable penetration in TAS1: 100.0%

Click to expand AI analysis

Constraint EventTASmajor14 Apr 2026, 09:00 am

High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price)

Constraint EventTASmajor14 Apr 2026, 01:20 am

High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price)

Constraint EventTASmajor13 Apr 2026, 07:05 pm

High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price)

high_renewableTASminor13 Apr 2026, 03:30 pm

High renewable penetration in TAS1: 100.0%

Click to expand AI analysis

Constraint EventTASmajor12 Apr 2026, 11:30 pm

High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price)

high_renewableTASminor12 Apr 2026, 03:30 pm

High renewable penetration in TAS1: 100.0%

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high_renewableSAminor11 Apr 2026, 05:30 pm

High renewable penetration in SA1: 96.1%

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high_renewableTASminor11 Apr 2026, 03:30 pm

High renewable penetration in TAS1: 100.0%

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Constraint EventNEMmoderate11 Apr 2026, 09:20 am

High-value binding constraint in NEM: F_T+FARE_N-2_TG_R6 ($1096 shadow price)

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high_renewableSAminor10 Apr 2026, 05:00 pm

High renewable penetration in SA1: 95.6%

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high_renewableTASminor10 Apr 2026, 03:30 pm

High renewable penetration in TAS1: 100.0%

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Showing 30 of 91

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Recent Market Events

High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania achieved 100% renewable energy penetration during the 07:10–07:30 AEST window on 23 April 2026, with the generation mix dominated by hydro (approximately 644–657 MW) and supplemented by wind (approximately 16–26 MW), with no gas generation online. Spot prices remained relatively modest and stable, ranging from $88.20/MWh to $96.22/MWh, consistent with a minor severity event reflecting ordinary market conditions rather than any stress or price spike.
High-value binding constraint in NEM: F_S+SETB_L1 ($990 shadow price) — NEM, constraint_event, moderate
A high-value binding network constraint, F_S+SETB_L1, was recorded in the NEM with a peak shadow price of $990/MWh, indicating significant congestion on the South Australian transmission network around the South East to Tailem Bend corridor. The constraint appeared across multiple dispatch intervals with shadow prices of $990, $208.27, and $15.20, suggesting a period of sustained but easing network pressure. A related constraint, F_S++SETB_L60, and a frequency regulation constraint (F_T+RREG_0050) were also binding concurrently, pointing to broader system stress in the region.
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's electricity grid reached 100% renewable penetration during the 07:00–07:25 AEST window on 22 April 2026, driven entirely by hydro and wind generation with no gas-fired output online. Spot prices remained stable and relatively modest, hovering around $87/MWh throughout the period, indicating the grid was comfortably managing the fully renewable supply. Rooftop PV contributed a minor but meaningful share alongside utility-scale wind and hydro assets.
High-value binding constraint in NEM: F_Q+8E_L1 ($8451 shadow price) — NEM, constraint_event, major
A high-value binding network constraint, F_Q+8E_L1, was activated in the NEM with an exceptionally high shadow price of $8,451/MW, indicating significant transmission network congestion in Queensland. This constraint is associated with Queensland's 8 Errors (8E) network grouping, suggesting a limitation on power flows across a critical Queensland transmission corridor. The constraint's severity rating of 'major' reflects the substantial impact this network limitation is having on market dispatch and pricing outcomes.
High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price) — TAS1, constraint_event, major
A major binding network constraint event occurred in Tasmania (TAS1) on 21 April 2026, with the constraint T_BLINK_TV_NGZ registering an extraordinarily high shadow price of $7,308,000/MWh — indicative of a severe transmission limitation likely associated with the Basslink interconnector or a critical Tasmanian transmission corridor. Notably, wholesale spot prices in TAS1 remained relatively modest at around $75.22/MWh during the event period, suggesting the constraint was binding on flows rather than directly setting the regional spot price. The generation mix at the time was dominated by hydro (approximately 686 MW across recorded intervals) and wind (approximately 375 MW combined), with no gas generation dispatched.
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's electricity grid achieved 100% renewable penetration during the early morning period of 21 April 2026, driven entirely by hydro and wind generation with no gas-fired output. Spot prices settled at approximately $96.22/MWh for most of the observed interval, following a slightly elevated opening price of $111.23/MWh. The event is classified as minor severity, consistent with Tasmania's status as a predominantly renewable grid anchored by its extensive hydro resources.
High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price) — TAS1, constraint_event, major
A major binding constraint event occurred in Tasmania (TAS1) on 20 April 2026, with the T_BLINK_TV_NGZ constraint registering an extraordinarily high shadow price of $7,308,000, indicating severe network congestion or a significant transmission limitation within the Tasmanian grid. Despite this constraint binding at an extreme marginal value, spot prices in TAS1 remained relatively modest in the $96–$100/MWh range during the affected period, suggesting the constraint was being managed through dispatch rather than manifesting directly as a price spike. The generation mix during this period was dominated by hydro (~630–663 MW) with minimal wind (~15–19 MW) and no gas OCGT output.
High-value binding constraint in NEM: F_Q+8E_L1 ($182700 shadow price) — NEM, constraint_event, major
A major binding network constraint identified as F_Q+8E_L1 has triggered in the NEM with an exceptionally high shadow price of $182,700/MWh, indicating a severe transmission limitation affecting Queensland's network. This constraint is operating alongside several other binding constraints in the Queensland region (F_Q++8E_L60 and F_Q++8E_L6), though at dramatically lower marginal values, suggesting a highly localised and acute network bottleneck. The extreme shadow price reflects the significant cost the market operator is incurring to maintain system security within the constrained corridor.
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's electricity grid achieved 100% renewable penetration during the morning period of 20 April 2026, driven entirely by hydro and wind generation with no gas-fired generation online. Spot prices remained stable and moderate at approximately $96.22–$96.24/MWh across the observed intervals, reflecting a well-supplied grid with no significant price stress. Total generation was predominantly hydro-sourced, with approximately 555–650 MW of hydro output complemented by around 25–35 MW of wind generation.
High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price) — TAS1, constraint_event, major
A major binding constraint event occurred in Tasmania (TAS1) on 19 April 2026, with the constraint T_BLINK_TV_NGZ registering an extraordinarily high shadow price of $7,308,000 — indicative of a severe network limitation likely related to the Basslink interconnector or a critical intra-Tasmanian transmission element. Despite this constraint's extreme marginal value, wholesale spot prices in TAS1 remained relatively stable and modest at approximately $110.22–$110.24/MWh during the period, suggesting the constraint was managed without triggering a local price spike. Tasmania's generation mix during this period was dominated by hydro (~514–538 MW) with modest wind contribution (~28–33 MW) and no gas peaking plant dispatched.
High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price) — TAS1, constraint_event, major
A major binding network constraint (T_BLINK_TV_NGZ) emerged in Tasmania on 19 April 2026, carrying an extraordinarily high shadow price of approximately $7.3 million, indicating severe transmission network limitations within the Tasmanian grid. Spot prices in TAS1 elevated modestly across the observed intervals, peaking at $125.16/MWh at 10:05 AEST, suggesting the constraint was partially managed but remained binding. Tasmania's generation mix at the time was almost entirely hydro-dominated, contributing approximately 1,350–1,450 MW, with minimal wind output and no gas generation online.
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's electricity grid achieved 100% renewable penetration during the morning period of 19 April 2026, driven almost entirely by hydro generation averaging approximately 527 MW, supplemented by modest wind output of around 15 MW. Spot prices were moderate and gradually rising, ranging from $88.32/MWh to $117.26/MWh across the observed dispatch intervals, well within normal operating bounds. No gas generation was dispatched during this period, confirming a fully renewable dispatch outcome.
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's TAS1 region achieved 100% renewable penetration during the period from approximately 06:05–06:30 UTC on 18 April 2026, with generation supplied entirely by hydro (peaking at around 683 MW) and wind (approximately 50–57 MW). Spot prices were relatively stable and moderate, ranging from $88.16 to $96.20/MWh, indicating no significant supply-demand stress despite the all-renewable generation mix. Gas OCGT capacity remained offline throughout the observed interval.
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania (TAS1) achieved 100% renewable penetration during the morning period of 17 April 2026, with generation supplied entirely by hydro (averaging approximately 265 MW) and wind (averaging approximately 256 MW), and gas OCGT units offline. Spot prices were relatively stable and moderate, ranging between $66/MWh and $88/MWh across the observed dispatch intervals, with no extreme price outcomes despite full renewable operation.
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's grid achieved 100% renewable penetration during the early morning period of 16 April 2026, with generation supplied entirely by a combination of wind (approximately 249–276 MW) and hydro (approximately 238–245 MW). Spot prices remained stable and moderate, ranging narrowly between $74.16 and $75.00/MWh across the observed dispatch intervals, reflecting a well-balanced supply-demand position. Gas OCGT units recorded zero output throughout, confirming full displacement by renewable sources.
High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price) — TAS1, constraint_event, major
A major binding network constraint, T_BLINK_TV_NGZ, was active in the Tasmanian region (TAS1) on 15 April 2026, registering an extraordinarily high shadow price of $7,308,000 — indicative of a severe transmission limitation within the Tasmanian network. Despite the constraint's extreme marginal value, spot prices in TAS1 remained relatively modest, ranging between approximately $96 and $104/MWh across the observed interval, suggesting the constraint was binding on intra-regional or interconnector flows rather than directly setting the regional reference price. The generation mix at the time was dominated by wind (~244–248 MW) and hydro (~227–295 MW), with no gas OCGT output recorded.
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's grid achieved 100% renewable penetration during the early morning period of 15 April 2026, with generation supplied entirely by hydro (approximately 420–438 MW) and wind (approximately 142–160 MW), while gas OCGT units remained offline. Spot prices were relatively stable around $88/MWh before rising to a short-term peak of $110.79/MWh at 06:00 AEST, suggesting modest demand-side or dispatch pressures despite the clean generation mix.
High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price) — TAS1, constraint_event, major
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's electricity grid achieved 100% renewable penetration during the early morning period on 14 April 2026, with generation supplied entirely by hydro (averaging approximately 427 MW) and wind (averaging approximately 226 MW). Gas OCGT units remained offline throughout the observed intervals, and wholesale prices held steady at $88.16/MWh across all seven dispatch intervals. This represents a routine but notable operational milestone for Tasmania, which routinely leads the NEM in renewable generation share.
High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price) — TAS1, constraint_event, major
High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price) — TAS1, constraint_event, major
High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price) — TAS1, constraint_event, major
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's grid achieved 100% renewable penetration during the early morning period of 13 April 2026, with generation supplied entirely by hydro (approximately 383–444 MW) and wind (approximately 175–197 MW) resources, and gas OCGT units offline. Spot prices remained moderate, ranging between roughly $68 and $86 per MWh, suggesting balanced supply and demand conditions without significant price stress. This is a relatively routine occurrence for Tasmania given its predominantly hydro-based generation fleet.
High-value binding constraint in TAS1: T_BLINK_TV_NGZ ($7308000 shadow price) — TAS1, constraint_event, major
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's electricity grid achieved 100% renewable penetration during the early morning period of 12 April 2026, with generation supplied entirely by hydro (approximately 300–318 MW) and wind (approximately 265–268 MW) resources, and no gas-fired generation dispatched. Spot prices were broadly moderate, ranging from around $19 to $61/MWh, with two notable dips at 05:15 and 05:35 AEST suggesting brief periods of surplus generation or dispatch variation.
High renewable penetration in SA1: 96.1% — SA1, high_renewable, minor
South Australia recorded exceptionally high renewable penetration of 96.1% during the early morning period on 11 April 2026, driven almost entirely by wind generation totalling approximately 1,749 MW across multiple wind farms. Spot prices were persistently negative throughout the observed window, ranging from -$3.00/MWh to -$0.09/MWh, consistent with a supply surplus condition. Only a small amount of gas-fired CCGT generation (approximately 84 MW combined) remained online, likely for system security purposes.
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's grid reached 100% renewable penetration during the early morning period of 11 April 2026, driven entirely by hydro and wind generation with no gas-fired output. Prices were volatile across the observed window, including several negative price intervals between approximately 05:25 and 05:45 AEST, before recovering to around $50/MWh. The event is classified as minor severity, consistent with Tasmania's well-established capability to operate on fully renewable generation.
High-value binding constraint in NEM: F_T+FARE_N-2_TG_R6 ($1096 shadow price) — NEM, constraint_event, moderate
A binding network constraint identified as F_T+FARE_N-2_TG_R6 activated in the NEM, reaching a peak shadow price of $1,096.22/MWh before declining through subsequent dispatch intervals to $74.15/MWh. This constraint relates to a Tasmanian N-2 contingency scenario on the Farrell network element, likely limiting transfer capability across a critical transmission corridor. The elevated shadow price indicates AEMO's dispatch engine was significantly constrained in its ability to optimise generation dispatch across the affected region.
High renewable penetration in SA1: 95.6% — SA1, high_renewable, minor
South Australia recorded very high renewable penetration of 95.6% during the early morning period on 10 April 2026, driven almost entirely by wind generation totalling approximately 1,573 MW across the region. Spot prices remained negative throughout the observed interval, ranging from approximately -$3.48/MWh to near zero, consistent with a classic oversupply scenario. Only a small amount of gas-fired combined cycle generation (around 41–43 MW) remained online, likely for system security purposes.
High renewable penetration in TAS1: 100.0% — TAS1, high_renewable, minor
Tasmania's TAS1 region achieved 100% renewable penetration during the early morning period of 10 April 2026, with generation supplied entirely by a combination of wind (approximately 278–281 MW) and hydro (approximately 235–273 MW). Wholesale prices remained stable and modest at $20.10/MWh across all observed dispatch intervals, reflecting the low marginal cost of the renewable generation mix. No gas-fired OCGT generation was dispatched during this period.