Appendix A Significant Rebids The rebidding tables highlight the relevant rebids submitted by generators that impacted on market outcomes during the time of high prices. It details the time the was submitted and used by the dispatch process, the amount of capacity involved and the change in the price of the capacity was being offered. The reason submitted at the time of the rebid is also included. Significant Rebids for 3 pm Trading interval Submit time Participant Station Capacity rebid (MW) from ($/MWh) Price to ($/MWh) Rebid reason 11.07 am Millmerran Millmerran 53 7 Price cap 11:06 A change in QLD PD demand sensitivities -SL 12.48 pm Origin Mt Stuart 120 Price cap <96 constraint management - N^^Q_NIL_B1 SL 12.52 pm Origin Mt Stuart -18 96 N/A 1250P change in avail - ambient conditions SL 12.56 pm Origin Mt Stuart -18 96 N/A plant conditions – ambient temp SL 1.47 pm Origin Mt Stuart 244 <96 Price cap 1344A inc QLD dem – 5PD 8275MW > 30PD 8166MW @1400 SL 1.50 pm CS Energy 90 <45 Price cap 1349A interconnector constraint- binding-SL 2.05 pm CS Energy Gladstone 80 <95 Price cap 1429A interconnector constraint-QNI binding and Oakey and Braema 2.29 pm (effective from 2.40 pm) CS Energy Gladstone, Wivenhoe 170 Price cap <299 1429A interconnector constraint-QNI binding and Oakey and Braema 2.39 pm (effective from 2.50 pm) CS Energy Gladstone, Wivenhoe 310 <300 cap 1437A constraint-QNI binding plus other units increasing-SL 2.51 pm (effective from 3 pm) CS Energy Gladstone 80 <45 Price cap 1451A constraint-QNI binding plus other units increasing-SL capacity rebid from low to high prices 647
Capacity Withdrawn 36 Significant Rebids for 3.30 pm Trading interval Submit time Participant Station Capacity rebid (MW) Price from ($/MWh) Price to ($/MWh) Rebid reason 12.48 pm Origin Mt Stuart 120 Price cap <96 1245A constraint management - N^^Q_NIL_B1 SL 12.52 pm Origin Mt Stuart -18 96 N/A 1250P change in avail - ambient conditions SL 12.53 pm CS Energy Gladstone -24 0 N/A unit rts revised-SL 12.56 pm Origin Mt Stuart -18 96 N/A 1255P plant conditions – ambient temp SL 1.04 pm ERM Oakey 20 302 13 499 fuel management::change MW distrib. 1.16 pm ERM Oakey 20 302 13 499 1316P fuel management::change MW distrib. 1.50 pm CS Energy 90 <44 Price cap 1348A interconnector constraint- binding-SL 2.05 pm CS Energy Gladstone 80 <93 Price cap 1403A interconnector constraint-QNI binding and yabulu increasin 2.53 pm Arrow Braemar 2 42 <285 cap change in 5min PD: QLD demand lower than 30 min PD SL 2.53 pm Origin Mt Stuart 154 <96 Price cap 1450A constraint management – N^^Q_NIL_B1 SL 2.56 pm (effective from 3.05 pm) ERM Power Oakey 19 13 499 0 1456F material change in market conditions::change MW distrib.
2.59 pm (effective from 3.10 pm) CS Energy Gladstone 140 <290 Price cap 1459A interconnector constraint-QNI-SL 3.02 pm (effective from 3.10 pm) ERM Power Oakey 19 0 13 499 1502F change in PD: fcast price dec::change MW distrib. 3.10 pm (effective from 3.20 pm) Millmerran Millmerran 30 7 Price cap 15:04 A RRP PD 3.11 pm (effective from 3.20 pm) Callide Callide C 26 Price floor Price cap 1505A RRP above PD 3.18 pm (effective from 3.25 pm) Origin Mt Stuart 90 53 12 950 1515A constraint management – N^^Q_NIL_B1 SL 3.19 pm (effective from 3.30 pm) CS Energy Gladstone 80 <44 Price cap 1519A interconnector constraint-QNI-SL Total capacity rebid from low to high prices 690 Capacity Withdrawn 60 Significant Rebids for 4 pm Trading interval Submit time Participant Station Capacity (MW) Price from ($/MWh) Price to ($/MWh) Rebid reason 12.48 pm Origin Mt Stuart 120 Price cap <96 1245A constraint management - N^^Q_NIL_B1 SL 12.52 pm Origin Mt Stuart -18 96 N/A 1250P change in avail - ambient conditions SL 12.53 pm CS Energy Gladstone -40 0 N/A 1253P unit rts revised-SL
12.56 pm Origin Mt Stuart -18 96 N/A 1255P plant conditions – ambient temp SL 1.04 pm ERM Oakey 20 300 13 499 1304P fuel management::change MW distrib. 1.16 pm ERM Oakey 20 286 13 499 1316P fuel management ::change MW distrib. 1.50 pm CS Energy 90 <44 cap 1348A interconnector constraint- binding-SL 1.59 pm ERM Power Oakey 40 13 499 <0 1358P fuel management ::change MW distrib 2.05 pm CS Energy Gladstone 80 <93 Price cap 1403A interconnector constraint-QNI binding and Yabulu increasin 2.53 pm Arrow Braemar 2 42 <285 Price cap 1450A change in 5min PD: QLD demand lower than 30 min PD SL 2.53 pm Origin Mt Stuart 154 <96 Price cap constraint management – N^^Q_NIL_B1 SL 3.10 pm Millmerran Millmerran 30 7 cap 15:04 A RRP above PD 3.11 pm Callide Callide C 26 Price floor Price cap 1505A RRP above PD 3.21 pm CS Energy Gladstone 140 <290 cap interconnector 3.28 pm (effective from 3.35 pm) ERM Power 40 13 499 <0 1526F change in pd: fcast price inc::change MW distrib. 3.38 pm (effective from 3.45 pm) Origin Mt Stuart 154 Price cap <53 1535A unforecast mpc spike SL 3.50 pm (effective from 4 pm) CS Energy Gladstone 80 22 Price cap 1549A interconnector constraint-QNI binding – other units increa 3.51 pm (effective from 4 pm) Callide Callide C 40 Price floor Price cap 1548A RRP below PD – SL Gladstone,
Total capacity rebid from low to high prices 756 Capacity Withdrawn 76 Significant Rebids for 4.30 pm Trading interval Submit time Participant Station Capacity (MW) Price from ($/MWh) Price to ($/MWh) reason 12.48 pm Origin Mt Stuart 120 cap <96 1245A constraint management - N^^Q_NIL_B1 SL 12.52 pm Origin Mt Stuart -18 96 N/A 1250P change in avail - ambient conditions SL 12.53 pm CS Energy Gladstone -40 0 N/A unit rts revised-SL 12.56 pm Origin Mt Stuart -18 96 N/A 1255P plant conditions – ambient temp SL 1.04 pm ERM Oakey 20 300 13 499 fuel management::change MW distrib. 1.16 pm ERM Oakey 20 300 13 499 fuel management ::change MW distrib. 1.50 pm CS Energy Gladstone 160 cap <44 1349A interconnector constraint- binding-SL 1.59 pm ERM Power 40 13 499 <0 1358P fuel management ::change MW distrib 2.05 pm CS Energy Gladstone 80 <93 Price cap 1403A interconnector constraint-QNI binding and yabulu increasin 2.53 pm Arrow Braemar 2 42 <285 cap change in 5min PD: QLD demand lower than 30 min PD SL 3.10 pm Millmerran Millmerran 30 7 Price cap 15:04 A RRP above PD 3.11 pm Callide Callide C 26 Price floor Price cap RRP above PD 3.17 pm ERM Power 23 <302 13 499 1516P ambient conditions ::change MW distrib.
3.38 pm CS Energy Wivenhoe 250 15 Price cap interconnector binding with prices above $1 3.44 pm and 3.46 pm CS Energy Gladstone 140 <290 Price cap maintain dispatch 3.57 pm (effective from 4.05 pm) ERM 42 12850 436 1556F change in pd: fcast price inc::change mw distrib. 4.09 pm (effective from 4.20 pm) ERM Power Oakey 22 436 12850 1608F change in pd: fcast price inc::change mw distrib. 4.11 pm (effective from 4.20 pm) Origin Mt Stuart 84 <96 12 950 1608A constraint management – N^^Q_NIL_B1 SL 4.14 pm (effective from 4.25 pm) ERM Power Oakey 22 12850 Price floor 1614F change in pd: fcast price inc::change mw distrib. 4.17 pm (effective from 4.25 pm) Braemar 2 33 13 500 29 1615A QLD price higher than forecast SL 4.20 pm (effective from 4 pm) CS Energy Gladstone 120 22 cap interconnector binding – other units increa Total capacity rebid from low to high prices 634 Capacity Withdrawn 76 Significant Rebids for 5 pm Trading interval Submit time Participant Station Capacity rebid (MW) Price from ($/MWh) Price to ($/MWh) Rebid reason QNI QNI
4.25 pm (effective from 4.35 pm) Millmerran Millmerran 10 7 cap 16:25 A RRP above PD 4.26 pm (effective from 4.35 pm) CS Energy Gladstone 60 <296 Price cap 1626A interconnector constraint-QNI binding other units increa 4.28 pm (effective from 4.35 pm) ERM Power Oakey 22 458 13 499 1627P ambient conditions ::change MW distrib. Total capacity rebid from low to high prices 362 Capacity Withdrawn 96 Significant Rebids for 5.30 pm Trading interval Submit time Participant Station Capacity rebid (MW) Price from ($/MWh) to ($/MWh) Rebid reason 12.48 pm Origin Mt Stuart 120 Price cap <96 1245A constraint management - N^^Q_NIL_B1 SL 12.52 pm Origin Mt Stuart -18 96 N/A 1250P change in avail - ambient conditions SL 12.53 pm CS Energy Gladstone -40 0 N/A unit rts revised-SL 12.56 pm Origin Mt Stuart -18 96 N/A plant conditions – ambient temp SL 1.04 pm ERM Power Oakey 20 300 13 499 1304P fuel management:: change MW distrib. 1.16 pm ERM Power Oakey 20 300 13 499 1316P fuel management ::change MW distrib. 1.59 pm ERM Oakey 40 13 499 <0 1358P fuel management ::change MW distrib 2.53 pm Arrow Braemar 2 42 <301 Price cap 1450A change in 5min PD: QLD demand lower than 30 min PD SL
3.10 pm Millmerran Millmerran 30 7 Price cap 15:04 A RRP above PD 3.11 pm Callide Callide C 36 Price floor cap 1505A RRP above PD 3.17 pm ERM Power Oakey 23 <302 13 499 ambient conditions ::change MW distrib. 3.38 pm CS Energy Wivenhoe 250 15 Price cap 1528A interconnector constraint-QNI binding with prices above $1 4.01 pm CS Energy Gladstone -20 0 N/A 1601P plant not following target rebid it match load-SL 4.17 pm ERM Power Oakey 42 13 499 <458 1617F change in PD: fcast price inc::change MW distrib. 4.25 pm Millmerran Millmerran 10 7 Price cap 16:25 A RRP above PD 4.28 pm ERM Oakey 22 458 13 499 1627P ambient conditions ::change MW distrib. 4.48 pm Origin Mt Stuart 54 <96 12 950 1641A inc QLD dem – 5PD 8512MW > 30PD 8398MW @ 1730 SL 4.54 pm (effective from 5.05 pm) CS Energy Gladstone 60 <296 Price cap interconnector binding-SL 5.02 pm (effective from 5.10 pm) Arrow Braemar 2 36 Price Cap 31 1700A QLD price higher than forecast SL 5.07 pm (effective from 5.15 pm) CS Energy Gladstone 40 22 Price cap 1706A interconnector constraint-QNI almost binding-SL 5.15 pm (effective from 5.25 pm) Millmerran Millmerran 20 7 cap 17:14 A change in 5min PD QNI flow – SL 5.19 pm (effective from 5.30 pm) Callide Callide C 10 floor Price cap 1717A change PD demand sensitivities – SL
6.06 pm (effective from 6.15 pm) CS Energy Gladstone 100 <296 Price cap 1806A interconnector constraint-QNI binding-SL 6.09 pm (effective from 6.15 pm) ERM Power Oakey 24 13 499 Price floor 1808F material change in market conditions ::change MW distrib. 6.13 pm (effective from 6.20 pm) CS Energy Gladstone -30 0 N/A 1813P unit ramping rebid to match-scada-SL 6.20 pm (effective from 6.30 pm) CS Energy Gladstone 80 22 Price cap 1820A interconnector constraint-close to binding-SL 6.22 pm (effective from 6.30 pm) Millmerran Millmerran 30 7 cap 18:20 A change in 5min PD flow – SL capacity rebid from low to high prices 549 Capacity Withdrawn 56 Significant Rebids for 7 pm Trading interval Submit time Participant Station Capacity rebid (MW) Price from ($/MWh) Price to ($/MWh) Rebid reason 12.48 pm Origin Mt Stuart 120 cap <96 1245A constraint management - N^^Q_NIL_B1 SL 12.52 pm Origin Mt Stuart -18 96 N/A 1250P change in avail - ambient conditions SL 12.53 pm CS Energy Gladstone -170 <13 500 N/A 1253P unit rts revised-SL 12.56 pm Origin Mt Stuart -18 96 N/A 1255P plant conditions – ambient temp SL 1.04 pm ERM Oakey 20 300 13 499 1304P fuel management:: change MW distrib.
6.41 pm (effective from 6.50 pm) Callide Callide C 20 Price floor Price cap 1839A change in 5min PD QNI flow - SL 6.53 pm (effective from 7 pm) CS Energy Gladstone 40 N/A 0 1852P unit ramping rebid to match-rts-SL Total capacity rebid from low to high prices 508 Capacity Withdrawn 56 Significant Rebids for 7.30 pm Trading interval Submit time Participant Station Capacity (MW) Price from ($/MWh) to ($/MWh) Rebid reason 12.48 pm Origin Mt Stuart 120 Price cap <96 1245A constraint management - N^^Q_NIL_B1 SL 12.52 pm Origin Mt Stuart -18 96 N/A 1250P change in avail - ambient conditions SL 12.56 pm Origin Mt Stuart -18 96 N/A plant conditions – ambient temp SL 2.53 pm Braemar 2 36 <301 Price cap change in 5min PD: QLD demand lower than 30 min PD SL 3.10 pm Millmerran Millmerran 30 7 Price cap 15:04 A RRP PD 3.11 pm Callide Callide C 36 Price floor Price cap 1505A RRP above PD 3.17 pm ERM Power Oakey 23 <302 13 499 ambient conditions ::change MW distrib. 4.01 pm CS Energy Gladstone 170 <=Price cap N/A 1601P plant not following target rebid it match load-SL 4.12 pm Arrow Braemar 2 15 <142 Price cap 1611P ambient conditions: adjust bid for prevailing conditions 4.25 pm Millmerran Millmerran 10 7 Price cap 16:25 A RRP above PD
4.27 pm Callide Callide C 20 Price cap Price floor RRP above PD - SL 5.15 pm Millmerran Millmerran 20 7 Price cap 17:14 A change in 5min PD QNI flow – SL 5.19 pm Callide Callide C 10 Price cap cap 1717A change PD demand sensitivities – SL 5.40 pm CS Energy Gladstone 20 N/A 0 unit offline revised-SL 5.49 pm Callide Callide C -20 <15 N/A 1749P PA fan max 6.02 pm Origin Mt Stuart 84 <96 12 950 inc QLD dem – 5PD 8376MW > 30PD 8187MW @ 1830 SL 6.22 pm Millmerran Millmerran 30 7 Price cap 18:20 A change in 5min PD flow – SL 6.41 pm Callide Callide C 20 Price floor cap 1839A change in 5min PD QNI flow – SL 6.53 pm CS Energy Wivenhoe 325 <296 Price cap 1849F interconnector constraint-QNI binding-SL Total capacity rebid from low to high prices 479 Capacity Withdrawn 206 Significant Rebids for 8 pm Trading interval Submit time Participant Station Capacity rebid (MW) Price from ($/MWh) Price to ($/MWh) reason 12.48 pm Origin Mt Stuart 120 Price cap <96 1245A constraint management - N^^Q_NIL_B1 SL 12.52 pm Origin Mt Stuart -18 96 N/A 1250P change in avail - ambient conditions SL 12.56 pm Origin Mt Stuart -18 96 N/A 1255P plant conditions – ambient temp SL 2.53 pm Arrow Braemar 2 33 <301 Price cap 1450A change in 5min PD: QLD demand lower than 30 min PD SL