Alberta Electric System Operator
System Co-ordination Plan
2025-04-17 to 2025-04-25
Approved Outages

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From To Owner Type Element Scheduled Activity Date/Time Comments Interconnection
05-Oct-18 08:00 30-Jun-26 16:00 EPCOR IO C2 (Rossdale) forced outage 2,825.33 Days
Continuous		  
24-Oct-18 01:13 30-Jun-26 16:00 EPCOR IO C1 (Rossdale) forced outage 2,806.62 Days
Continuous		  
27-Nov-23 08:00 20-Jun-25 16:00 ENMAX Outage 32.2TR (SS-32) 32 sub 32.2TR 8 kV bus switchgear demolition 571.29 Days
Continuous		  
26-Jul-24 10:00 31-Jul-26 16:00 ATCO Outage 826s 504R (826s Marguerite Lake) emergency removal to replace failed 502R @834S 735.25 Days
Continuous		  
23-Aug-24 13:45 30-Apr-25 14:29 ALTALINK Outage 157s C1 (157s Lac La Biche) forced outage 250.03 Days
Continuous		  
23-Sep-24 10:00 29-May-25 12:00 ATCO TE 741s RTU/SCADA (741s Fox Creek) RTU configuration on new and old RTU's onsite 248.08 Days
Continuous		  
05-Oct-24 00:00 30-Jun-25 17:00 BHE Canada Outage 120s C1 (120s Picture Butte) forced outage 268.71 Days
Continuous		  
21-Oct-24 12:00 29-May-25 17:30 ATCO TE 741s Protection & Control (741s Fox Creek) block 144kv and 25 kv bus protection and breaker fail protection for the duration of 741s project 220.23 Days
Continuous		  
03-Jan-25 07:00 27-Jun-25 17:00 EPCOR TE 805s Protection & Control (805s Jasper), 805s RTU/SCADA (805s Jasper) protection blocking for P&C maintenance at Jasper 175.38 Days
Continuous		  
06-Jan-25 09:30 21-Jun-25 18:00 ALTALINK Outage 150L (42s Sarcee - 150AL tap), 42s 150W (42s Sarcee) arctic arrow will require a GOI on 150L to rebuild the section of line from structure 47-198. 166.31 Days
Continuous		  
13-Jan-25 07:00 02-May-25 17:00 EPCOR TE 330p Protection & Control (330p Genesee), 330p RTU/SCADA (330p Genesee) Genessee - 138/500 kV protection blocking for relay maintenance and configuration changes 109.38 Days
Continuous		  
24-Jan-25 00:00 31-Dec-25 16:00 ALTALINK Outage 74s C3 (74s Janet) forced outage 341.67 Days
Continuous		  
10-Feb-25 00:00 30-Jun-25 23:59 ATCO, ALTALINK IO 840s McNeill Station, 830L (562s Cypress - 840s McNeill Station), 840s 701T (840s McNeill Station), 840s 901T (840s McNeill Station) available for emergency use only 140.96 Days
Continuous		 AB-SK
11-Feb-25 10:00 30-May-25 16:00 ATCO TE 940s Protection & Control (940s Beartrap) relay testing 108.21 Days
Continuous		  
24-Feb-25 07:00 02-May-25 17:00 EPCOR TE 72RV6 (EP 511s Victoria - Rossdale) RV6 - protection blocking, MPLS cutovers 67.38 Days
Continuous		  
11-Mar-25 00:00 31-Dec-25 16:00 ALTALINK Outage 377s C1 (377s AML Hardisty) forced outage 295.71 Days
Continuous		  
16-Mar-25 08:00 23-Apr-25 17:00 ALTALINK TE 746s Protection & Control (746s Sherwood Park) replace B87/138B protection 38.38 Days
Continuous		  
18-Mar-25 14:00 17-Mar-26 17:30 ALTALINK Outage 217s C1 (217s North Red Deer) cap. bank unavailable and cannot be energized due to Koncar CTs being present 364.15 Days
Daily		  
20-Mar-25 08:00 20-Mar-26 17:00 ALTALINK Outage 263s C1 (263s Strachan) forced outage 365.38 Days
Continuous		  
20-Mar-25 08:00 20-Mar-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 365.38 Days
Continuous		  
28-Mar-25 09:00 30-Apr-25 14:00 ENMAX, ALTALINK IO 240kV West Bus (SS-25), 1109L (SS-25 - SS-65), 25B240-D136 (SS-25), 25B240-D133 (SS-25), 25B240-D141 (SS-25), 25B240-D142 (SS-25), 25B240-D139 (SS-25), 25MD240-1109 (SS-25) scaffold and begin to terminate new Cables at SS-25 33.21 Days
Continuous		  
28-Mar-25 09:00 30-Apr-25 14:00 ENMAX, ALTALINK Outage 240kV West Bus (SS-25), 1109L (SS-25 - SS-65), 25B240-D136 (SS-25), 25B240-D133 (SS-25), 25B240-D141 (SS-25), 25B240-D142 (SS-25), 25B240-D139 (SS-25), 25MD240-1109 (SS-25) scaffold and begin to terminate new Cables at SS-25 33.21 Days
Continuous		  
28-Mar-25 17:31 02-Jun-25 16:00 ATCO TE APS# 203 7L128-963S Overload Mitigation DLR integration checks 65.94 Days
Continuous		  
30-Mar-25 13:00 17-Apr-25 17:00 EPCOR Outage 72RG1 (Garneau - Rossdale), T3 (Garneau), G723 (Garneau), G724 (Garneau), G725 (Garneau), GT3 (Garneau), RG7210 (Rossdale), GDS18 (Garneau), GAB3 (Garneau) Garneau - TX3/RG1 zone - 72 kV switchgear SF6 overhaul with GE 18.17 Days
Continuous		  
31-Mar-25 07:00 07-Aug-25 17:00 EPCOR Outage 987s T1 (987s Clover Bar), 987s CCP7213 (987s Clover Bar), 987s CCP7214 (987s Clover Bar) Cloverbar - TX1 LCR 129.42 Days
Continuous		  
31-Mar-25 07:00 29-Aug-25 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) Cloverbar: protection blocking, 240 kV bus 3 differential for TX1 LCR duration 151.42 Days
Continuous		  
31-Mar-25 07:00 04-Jul-25 17:00 EPCOR TE Protection & Control (Woodcroft) Woodcroft: protection blocking for merging unit and protection upgrade. 95.42 Days
Continuous		  
31-Mar-25 12:01 28-Apr-25 17:00 ATCO Outage 741s 702T (741s Fox Creek), 741s 704 (741s ATC Fox Creek) substation rebuild project 28.21 Days
Continuous		  
01-Apr-25 08:00 31-Mar-27 17:00 ALTALINK Outage 310p T6b (310p Sundance) customer maintenance 729.38 Days
Continuous		  
06-Apr-25 06:30 25-Apr-25 07:30 EPCOR Outage 113s T1 (113s Inland Cement) TX1 maintenance testing 19.04 Days
Continuous		  
07-Apr-25 07:00 25-Apr-25 17:00 EPCOR Outage 72JW19 (EP 805s Jasper - Woodcroft), T1 (Woodcroft), W721 (Woodcroft), W722 (Woodcroft), EP 805s J724 (EP 805s Jasper), EP 805s JDS28 (EP 805s Jasper), WDS3 (Woodcroft), WAB1 (Woodcroft) TX1 zone, protection upgrade cutovers 18.42 Days
Continuous		  
07-Apr-25 08:00 19-Apr-25 16:00 ENMAX Outage 7.84L (SS-7 - SS-36), 36B138-7.84 (SS-36), 7B138-7.84 (SS-7) 36B138-7.84 H145A2752 breaker major overhaul 12.33 Days
Continuous		  
07-Apr-25 08:00 17-Apr-25 15:00 CMH Outage MHS-3 MH69-T32 (MHS-3 Southridge), MHS-3 MH69-306 (MHS-3 Southridge) replacement of bushings on transformer MH69-T32 and perform breaker maintenance on MH69-306 10.29 Days
Continuous		  
09-Apr-25 08:00 17-Apr-25 18:00 SUNCOR Outage 29PL7-10 (29EDD-18 Firebag - 29EDD-85), 29EDD-85 752-10010 (29EDD-85), 29EDD-85 752-10030 (29EDD-85), 29EDD-18 29-752-101 (29EDD-18 Firebag), 29EDD-18 29-752-102 (29EDD-18 Firebag), 29EDD-18 29PS-0043 (29EDD-18 Firebag), 29EDD-85 29PS-319 (29EDD-85) relay testing 8.42 Days
Continuous		  
13-Apr-25 08:00 23-Apr-25 16:00 ATCO, ALBIAN Outage 920s 901T (920s Jackpine) repair 72kV cables 10.33 Days
Continuous		  
13-Apr-25 08:00 23-Apr-25 16:00 ATCO, ALBIAN Outage 9LJH1 (919s Hartley - 920s Jackpine), 920s 901T (920s Jackpine), 919s 905 (919s Hartley), 920s 9LJH-1D2 (920s Jackpine) breaker maintenance and transformer major testing 10.33 Days
Continuous		  
14-Apr-25 07:00 28-Apr-25 17:00 EPCOR TE 805s Protection & Control (805s Jasper), Protection & Control (Poundmaker) 1098L - protection blocking for fiber move 14.42 Days
Continuous		  
14-Apr-25 07:00 23-May-25 17:00 EPCOR Outage 52s E2402 (52s East Industrial), 52s T2 (52s East Industrial) east industrial: emergency investigation and possible replacement of secondary cable and followed by TX2 protection upgrade cutovers 39.42 Days
Continuous		  
14-Apr-25 08:00 23-Apr-25 17:00 ALTALINK TE 746s RTU/SCADA (746s Sherwood Park) configuration updates for implementation of s700N control module, A-B/L5 protections, cutover controls for 746s700N 9.38 Days
Daily		  
14-Apr-25 08:00 23-Apr-25 17:00 ALTALINK TE 422s RTU/SCADA (422s Westwood) configuration updates for implementation of A-B/700L protections 9.38 Days
Daily		  
14-Apr-25 08:00 18-Apr-25 17:00 ALTALINK TE 409s Protection & Control (409s Shell Scotford) salvage 409s807N requiring setting changes 4.38 Days
Daily		  
14-Apr-25 08:00 18-Apr-25 17:00 ALTALINK TE 409s RTU/SCADA (409s Shell Scotford) configuration update for salvage of 409s807N 4.38 Days
Daily		  
14-Apr-25 08:00 17-Apr-25 17:00 CMH Outage MHS-1 69kV North Bus (MHS-1 Power P Switchyard), 4L (MHS-1 CMH Power Plant - MHS-6 CMH Riverview), MHS-1 MH69-2 (MHS-1 CMH Power Plant), MHS-1 MH69-13 (MHS-1 CMH Power Plant), MHS-1 MH69-24 (MHS-1 CMH Power Plant), MHS-1 MH69-34 (MHS-1 CMH Power Plant), MHS-6 MH69-607 (MHS-6 CMH Riverview) replacing north bus differential protection relay 3.38 Days
Continuous		  
14-Apr-25 08:00 17-Apr-25 17:00 ALTALINK TE 419s Protection & Control (419s Chestermere) RAS 194 functional testing 3.38 Days
Daily		  
14-Apr-25 09:00 23-Apr-25 18:00 ALTALINK Outage 700L (422s Westwood - 746L tap), 700L (746s Sherwood Park - 746L tap), 746L (700L tap - 746AL tap), 746s 700N (746s Sherwood Park), 422s 700 (422s Westwood) replacing 746s700N breaker control module, 700L line protections, 700L VSR, and cutting-over CT connection to new A87/138B 9.38 Days
Continuous		  
14-Apr-25 09:30 17-Apr-25 17:00 ALTALINK, EPCOR Outage 930L (37s North Calder - Poundmaker), PM2403 (Poundmaker), PM2404 (Poundmaker), PMDS10 (Poundmaker) 930L zone relay maintenance 3.31 Days
Continuous		  
14-Apr-25 09:30 17-Apr-25 17:00 ALTALINK, EPCOR IO 930L (37s North Calder - Poundmaker) epcor relay maintenance 3.31 Days
Continuous		  
14-Apr-25 09:30 18-Apr-25 17:30 ATCO Outage 730s STATCOM (730s Rycroft), 730s 702T (730s Rycroft), 730s 705 (730s Rycroft) annual inspection 4.33 Days
Continuous		  
14-Apr-25 10:00 17-Apr-25 16:00 ATCO Outage 700s 707C (700s Bonnyville), 700s 707 (700s Bonnyville) PRC-005 relay testing 3.25 Days
Continuous		  
15-Apr-25 07:00 18-Apr-25 15:00 ATCO IO 7L101 (790s Poplar Hill - 944s Lowe Lake) customer request 3.33 Days
Continuous		  
15-Apr-25 07:00 18-Apr-25 15:00 ATCO Outage 7L101 (790s Poplar Hill - 944s Lowe Lake), 790s 705 (790s Poplar Hill) trip coil testing PRC-005 3.33 Days
Continuous		  
15-Apr-25 07:00 18-Apr-25 15:00 ATCO TE 790s Protection & Control (790s Poplar Hill) RTXP test switch mitigation and replacement 3.33 Days
Continuous		  
15-Apr-25 07:00 17-Apr-25 18:00 ALTALINK Outage 430s 152 (430s Ursus) urgent replacement of leaking Koncar 430s152 (CT1) B-phase CT 2.46 Days
Continuous		  
15-Apr-25 08:00 18-Apr-25 16:00 Syncrude Outage Mildred T16 (Syncrude Mildred Lake), 1635 (Syncrude Mildred Lake) SCL - isolate T16 to complete come required maintenance 3.33 Days
Continuous		  
16-Apr-25 08:00 17-Apr-25 17:00 ALTALINK, TRANSALTA Outage 33s T2 (33s Spray) maintenance 1.38 Days
Continuous		  
16-Apr-25 08:00 17-Apr-25 17:00 ALTALINK TE 242s RTU/SCADA (242s Flat Lake) 2025 MPLS upgrade project - remote configuration change 1.38 Days
Daily		  
16-Apr-25 09:00 05-May-25 20:00 BCH Outage T4 (BCH Natal) disconnect T4 19.46 Days
Continuous		 AB-BC
17-Apr-25 08:00 17-Apr-25 17:30 ATCO Outage 741s 504C (741s Fox Creek) demo old cabling, remove old breaker, install new breaker and terminate new cabling from new protection/control building and commission new breaker Fox Creek Substation Upgrade Project 9.5 Hours
Continuous		  
17-Apr-25 08:00 17-Apr-25 16:00 ENMAX Outage 12.2TR (SS-12) take cell measurements in 12BB8-12.2TR cell for replacement breaker 8 Hours
Continuous		  
17-Apr-25 10:00 17-Apr-25 17:00 ATCO TE ATCO Telecom Equipment, 936s RTU/SCADA (936s Norberg), 936s Protection & Control (936s Norberg) Norberg_S-Telecom- PM on radio at Norberg Sub facing WhitefishTwr. 7 Hours
Continuous		  
17-Apr-25 13:00 20-Apr-25 18:00 ENMAX Outage 2GSU-XF-001 (SS-25), 25B240-D134 (SS-25), 25B240-D135 (SS-25) power factor test 3.21 Days
Continuous		  
17-Apr-25 13:00 20-Apr-25 18:00 ENMAX, ALTALINK Outage 1003L (74s Janet - SS-25) outage required to allow 2GSU 240kV bus isolation 3.21 Days
Continuous		  
17-Apr-25 13:00 20-Apr-25 18:00 ENMAX, ALTALINK IO 1003L (74s Janet - SS-25) outage required to allow 2GSU 240kV bus isolation 3.21 Days
Continuous		  
20-Apr-25 08:00 20-Apr-25 16:00 ENMAX Outage 47B138-BT3 (SS-47) HV breaker maintenance 8 Hours
Continuous		  
21-Apr-25 08:00 27-Apr-25 20:00 SUNCOR Outage 29EDD-1 Millennium 260kV West Bus 1, 29EDD-1 29EDD1s1052 (29EDD-1 Millennium) densimeter replacement 6.5 Days
Continuous		  
21-Apr-25 08:00 25-Apr-25 15:00 CMH Outage MH69s2 T21 (MH69s2 North Industrial), MHS-2 MH69-206 (MHS-2 North Industrial) replacement of bushings on transformer and perform breaker maintenance 4.29 Days
Continuous		  
21-Apr-25 08:00 21-Apr-25 18:00 ENMAX Outage 32.83L (SS-32 - SS-40), 32.2TR (SS-32), 32.1TR (SS-32), 26.81L (SS-26 - SS-32), 32B138-32BT5 (SS-32), 32B138-26.81 (SS-32), 32B138-32.83 (SS-32), 32MD138-32.1TR (SS-32) spring substation washing, check reversing switch 32.1TR 10 Hours
Continuous		  
21-Apr-25 08:00 27-Apr-25 16:00 Syncrude Outage 18215 (Syncrude Mildred Lake), Protection & Control (Syncrude Mildred Lake) repairs and maintenance required on 30-0PCB15-1 cap bank 6.33 Days
Continuous		  
21-Apr-25 08:00 25-Apr-25 17:00 ALTALINK TE 63s RTU/SCADA (63s Red Deer) implement and test new T3 ‘B’ protection alarms 4.38 Days
Daily		  
21-Apr-25 08:00 21-Apr-25 16:00 ENMAX TE RTU/SCADA (SS-13) SDN Upgrade 8 Hours
Continuous		  
21-Apr-25 08:30 05-May-25 12:00 ATCO Outage 879s 701T (879s Scottford Upgrader) 701T maintenance, 501FCL maintenance 14.15 Days
Continuous		  
21-Apr-25 08:30 25-Apr-25 12:30 ALTALINK Outage 63s T3 (63s Red Deer), 63s 26 (63s Red Deer) VR1 doble, maintenance, temp gauge replace, replace failed T3 protection 4.17 Days
Continuous		  
21-Apr-25 10:00 21-Apr-25 12:00 CMH TE Medicine Hat ICCP Outage, Medicine Hat IED/SCADA, Medicine Hat RAS/SCADA, Medicine Hat RTU/SCADA complete a transfer to the backup control center 2 Hours
Continuous		  
21-Apr-25 12:30 01-May-25 11:30 ALTALINK TE 20s RTU/SCADA (20s Ghost) RTU outages required during protection upgrade project @ 20s 9.96 Days
Daily		  
21-Apr-25 12:30 01-May-25 11:30 ALTALINK TE 20s Protection & Control (20s Ghost) removing the A & B protections one at a time during the protection upgrade project 9.96 Days
Daily		  
21-Apr-25 12:30 01-May-25 11:30 ALTALINK, TRANSALTA Outage 20s T1 (20s Ghost) replace the low side bushings on T1 9.96 Days
Continuous		  
22-Apr-25 07:00 22-Apr-25 17:00 EPCOR Outage M725 (Meadowlark) M725 relay maintenance and condensation heater repair 10 Hours
Continuous		  
22-Apr-25 07:00 27-Apr-25 17:00 EPCOR Outage 814s T2 (814s Bellamy), T1 (Rossdale), BR722 (Rossdale), RR723 (Rossdale), R721 (Rossdale) TX1 zone doble and RDS1/BDS18/RDS23 disconnect maintenance 5.42 Days
Continuous		  
22-Apr-25 07:00 27-Apr-25 17:00 EPCOR Outage 805s T3 (805s Jasper), EP 805s J2404 (EP 805s Jasper), EP 805s J2405 (EP 805s Jasper) TX3 zone relay maintenance, J2404 bay doble and tap changer maintenanc, PRD repair 5.42 Days
Continuous		  
22-Apr-25 08:00 30-Apr-25 16:00 ENMAX Outage 65.1TR (SS-65) tap changer inspection 8.33 Days
Continuous		  
22-Apr-25 08:00 24-Apr-25 16:00 ATCO TE 825s Protection & Control (825s Whitefish Lake) CIP firmware, software updates 2.33 Days
Continuous		  
22-Apr-25 08:00 23-Apr-25 16:00 ENMAX TE Protection & Control (SS-5) auto switching scheme Z32 outage, relay protection test 1.33 Days
Continuous		  
22-Apr-25 08:00 22-Apr-25 16:00 ENMAX Outage 15.62L (SS-15 - SS-16), 15.2TR (SS-15), 15B69-15.62 (SS-15) power factor test - 15PT69-1 8 Hours
Continuous		  
22-Apr-25 09:00 23-Apr-25 17:30 ATCO Outage 2075s ACF22 (2075s Newell) filter bank maintenance 1.35 Days
Continuous		  
22-Apr-25 09:00 22-Apr-25 11:00 ATCO TE ATCO Telecom Equipment Vegreville_T(SCC)-Telecom- Re-configure PMU VPLS 508 for added redundancy. 2 Hours
Continuous		  
22-Apr-25 09:30 22-Apr-25 12:00 ATCO Outage 7L22 (790s Poplar Hill - 7L88 tap), 790s 702 (790s Poplar Hill) PRC-005 - trip coil testing 2.5 Hours
Continuous		  
22-Apr-25 09:30 25-Apr-25 17:30 ATCO Outage 2029s 500kV Bus 1200BS1 (2029s Heathfield), 2029s 1201 (2029s Heathfield), 2029s 1204 (2029s Heathfield), 2029s 1207 (2029s Heathfield), 2029s 1214 (2029s Heathfield) PRC-005 - trip coil testing 3.33 Days
Continuous		  
22-Apr-25 09:30 23-Apr-25 17:30 ATCO TE 801s Protection & Control (801s Anderson) PRC-005 - microprocessor relay testing 1.33 Days
Continuous		  
22-Apr-25 09:30 24-Apr-25 17:30 ATCO TE 754s Protection & Control (754s Ksituan River), 754s RTU/SCADA (754s Ksituan River) relay settings update, SCADA update 2.33 Days
Continuous		  
22-Apr-25 10:00 22-Apr-25 16:00 ATCO TE ATCO Telecom Equipment, 882s RTU/SCADA (882s Triangle), 787s RTU/SCADA (787s High Prairie) replacing a CSM card on the SAR, and completing an OS upgrade 6 Hours
Continuous		  
22-Apr-25 12:01 24-Apr-25 17:30 ATCO Outage 790s 701C (790s Poplar Hill), 790s 701 (790s Poplar Hill) PRC-005 trip coil testing, breaker 701 SF6 HPL complete testing 2.23 Days
Continuous		  
22-Apr-25 13:00 02-May-25 17:00 ALTALINK Outage 163s T1 (163s Amoco Empress) oil reclaim and maintenance 10.17 Days
Continuous		  
22-Apr-25 13:30 22-Apr-25 16:00 ATCO Outage 939s 912 (939s Livock) PRC-005 - trip coil testing 2.5 Hours
Continuous		  
23-Apr-25 06:00 07-May-25 08:00 ALTALINK Outage 185s T2 (185s Bretville) maintenance on customer owned NGR, T2 meter replacement 14.08 Days
Daily		  
23-Apr-25 07:00 23-Apr-25 17:00 EPCOR Outage M726 (Meadowlark), 72PM25 (Poundmaker - Meadowlark), PM721 (Poundmaker) relay maintenance 10 Hours
Continuous		  
23-Apr-25 07:00 08-May-25 18:00 ALTALINK TE 185s Protection & Control (185s Bretville) customer protection upgrade 15.46 Days
Continuous		  
23-Apr-25 07:00 23-Apr-25 17:00 ALTALINK TE 67s RTU/SCADA (67s Stirling) techs to investigate RTU to T1 SR760 failure and loss of MW and MVAR indication to ACC 10 Hours
Daily		  
23-Apr-25 07:00 23-Apr-25 17:00 ALTALINK TE 67s Protection & Control (67s Stirling) techs to investigate RTU to T1 SR760 failure and loss of MW and MVAR indication to ACC 10 Hours
Daily		  
23-Apr-25 07:30 23-Apr-25 17:30 ALTALINK RB 706AL (452s B.F. Goodrich Fort Saskatchewan - 706L tap), 706L (410s Josephburg - 706AL tap), 706L (54s Fort Saskatchewan - 706AL tap) proximity RB for repairing the sensors on 706L (STR 26, 47, 71) 10 Hours
Daily		  
23-Apr-25 08:00 23-Apr-25 16:00 ALTALINK TE 268s RTU/SCADA (268s Whitecourt), AltaLink Telecom Equipment repair alarm condition on radio and possibly replace cards 8 Hours
Daily		  
23-Apr-25 08:00 24-Apr-25 16:00 ENMAX, ALTALINK Outage 24.83L (74s Janet - SS-24) replace structure 70 on line and breaker SF6 gas sample 1.33 Days
Continuous		  
23-Apr-25 08:00 23-Apr-25 17:00 ALTALINK Outage 729L (285s East Camrose - 542s Ervick), 542s 729W (542s Ervick), 285s 729W (285s East Camrose) replace arms and insulation at 729L264 9 Hours
Daily		  
23-Apr-25 08:00 24-Apr-25 16:00 ENMAX, ALTALINK Outage 24.83L (74s Janet - SS-24), 24B138-24.83 (SS-24), 74s 24.83X (74s Janet) replace structure 70 on line and breaker SF6 gas sample 1.33 Days
Continuous		  
23-Apr-25 08:00 23-Apr-25 16:00 ENMAX Outage 21.61L (SS-21 - SS-34), 34B69-21.61 (SS-34), 21B69-21.61 (SS-21) breaker power factor test 8 Hours
Continuous		  
23-Apr-25 09:00 23-Apr-25 16:00 ALTALINK Outage 12s 952 (12s Heartland) implement flashover protection setting or wiring on breaker and implement cross block function on T1 7 Hours
Daily		  
23-Apr-25 09:00 23-Apr-25 16:00 ALTALINK TE 12s Protection & Control (12s Heartland) relay protection changes to implement flashover protection setting or wiring on breaker and implement cross block function on T1 7 Hours
Daily		  
23-Apr-25 09:00 23-Apr-25 12:00 ATCO, ALTALINK, SHELL TE 879s Scotford Upgrader RTU/SCADA, 402s RTU/SCADA (402s Scotford Expansion 1) remove old V2 cards from SAR and place new V3 cards 3 Hours
Continuous		  
23-Apr-25 09:00 23-Apr-25 14:00 ALTALINK Outage 421s T1 (421s Hays) repair or replace 421sT1 H3 bushing as needed 5 Hours
Continuous		  
23-Apr-25 09:00 24-Apr-25 17:00 BCH Outage 5CB2 (BCH Selkirk) maintenance 1.33 Days
Continuous		 AB-BC
23-Apr-25 09:30 23-Apr-25 11:30 ATCO Outage 939s 901 (939s Livock) PRC-005 - TRIP COIL TESTING - BREAKER 901-NORTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 901-SOUTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 901-CENTER @ 939S		 2 Hours
Continuous		  
23-Apr-25 11:00 23-Apr-25 17:00 ALTALINK TE 48s RTU/SCADA (48s Pocaterra) reconfigure RTU to correct IED trouble alarm 6 Hours
Daily		  
23-Apr-25 11:31 23-Apr-25 14:00 ATCO Outage 939s 903 (939s Livock) PRC-005 - TRIP COIL TESTING - BREAKER 903-NORTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 903-SOUTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 903-CENTER @ 939S		 2.48 Hours
Continuous		  
23-Apr-25 12:00 23-Apr-25 16:00 ENMAX Outage 32.83L (SS-32 - SS-40), 40B138-32.83 (SS-40), 32B138-32.83 (SS-32) HV breaker SF6 gas sample 40B138-32.83 4 Hours
Continuous		  
23-Apr-25 14:01 23-Apr-25 16:30 ATCO Outage 939s 904 (939s Livock) PRC-005 - TRIP COIL TESTING - BREAKER 904-NORTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 904-SOUTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 904-CENTER @ 939S		 2.48 Hours
Continuous		  
24-Apr-25 07:00 28-Apr-25 18:00 ALTALINK Outage 113L (20s Ghost - 33s Spray), 20s 113 (20s Ghost), 33s 113 (33s Spray) Install new structures 228, 229 and 230 Salvage existing structure 228 4.46 Days
Continuous		  
24-Apr-25 07:00 24-Apr-25 17:00 ALTALINK TE 431s Protection & Control (431s Hussar) fault settings change 10 Hours
Daily		  
24-Apr-25 07:00 24-Apr-25 17:00 ALTALINK TE 396s Protection & Control (396s Pincher Creek) remote through fault settings change 10 Hours
Daily		  
24-Apr-25 07:00 24-Apr-25 17:00 ALTALINK TE 419s Protection & Control (419s Chestermere) remote through fault settings change 10 Hours
Daily		  
24-Apr-25 07:00 24-Apr-25 17:00 ALTALINK TE 394s Protection & Control (394s Empress) remote through fault settings change 10 Hours
Daily		  
24-Apr-25 07:00 24-Apr-25 17:00 ALTALINK TE 415s Protection & Control (415s Drywood) remote through fault settings change 10 Hours
Daily		  
24-Apr-25 07:00 24-Apr-25 17:00 ALTALINK TE 405s Protection & Control (405s Waupisoo) remote through fault settings change 10 Hours
Daily		  
24-Apr-25 07:00 24-Apr-25 17:00 ALTALINK TE 409s Protection & Control (409s Shell Scotford) remote through fault settings change 10 Hours
Daily		  
24-Apr-25 07:00 24-Apr-25 17:00 ALTALINK TE 420s Protection & Control (420s Broadmoor) remote through fault settings change 10 Hours
Daily		  
24-Apr-25 07:30 24-Apr-25 17:00 ALTALINK TE 33s Protection & Control (33s Spray) update relay settings 9.5 Hours
Daily		  
24-Apr-25 07:30 24-Apr-25 12:30 ALTALINK Outage 755L (247s Piper Creek - 535s Joffre), 247s 755 (247s Piper Creek) high load move str 77-78 5 Hours
Daily		  
24-Apr-25 08:00 24-Apr-25 17:00 ALTALINK Outage 661s Laura Lake, 996s Imperial Oil Carson Lake, 526L (519L tap - 526AL tap), 519L (519AL tap - 526L tap), 526L (519L tap - 526BL tap), 519AL (661s Laura Lake - 519L tap), 519L (996s Imperial Oil Carson Lake - 519AL tap), 661s T1 (661s Laura Lake), 996s T1 (996s Imperial Oil Carson Lake), 661s 5 (661s Laura Lake), 526L365 (526AL tap), 996s 519 (996s Imperial Oil Carson Lake), 996s 5 (996s Imperial Oil Carson Lake), 661s 1 (661s Laura Lake) change insulation on 526L214 9 Hours
Daily		  
24-Apr-25 08:00 24-Apr-25 17:00 ATCO RB 6L126 (743s Sarah Lake - 515L tap) AltaLink to perform work 9 Hours
Continuous		  
24-Apr-25 08:00 24-Apr-25 16:00 ENMAX Outage 16.63L (SS-16 - SS-36), 36B69-16.63/36.5TR (SS-36), 36.5TR (SS-36) HV Breaker Maintenance - 36B69-16.63/36.5TR. Breaker SF6 Gas Sample - 36B69-36.5TR 8 Hours
Continuous		  
24-Apr-25 08:00 24-Apr-25 16:00 ENMAX Outage 6.82L (SS-6 - SS-41), 6B138-6.82 (SS-6) power factor test 8 Hours
Continuous		  
24-Apr-25 08:30 30-Apr-25 17:30 ATCO TE 822s Protection & Control (822s Wolf Lake) Block relays associated with line 7L86. 6.38 Days
Continuous		  
24-Apr-25 08:30 30-Apr-25 17:30 ATCO TE 822s Protection & Control (822s Wolf Lake), 822s Wolf Lake RTU/SCADA relay settings changes 6.38 Days
Continuous		  
24-Apr-25 09:00 24-Apr-25 15:00 ALTALINK Outage 746s T1 (746s Sherwood Park) cutover CT connection to new A87/138B, investigate tap changer control issue 6 Hours
Daily		  
24-Apr-25 09:00 24-Apr-25 17:30 ATCO Outage 2075s ACF23 (2075s Newell) filter bank maintenance 8.5 Hours
Continuous		  
24-Apr-25 09:00 24-Apr-25 15:30 ATCO RB 9L79 (755s Cordel - 757s Battle River) annual climbing inspection 6.5 Hours
Continuous		  
24-Apr-25 09:00 24-Apr-25 15:30 ATCO RB 9L80 (755s Cordel - 757s Battle River) annual climbing inspection 6.5 Hours
Continuous		  
24-Apr-25 09:00 25-Apr-25 16:00 ATCO TE 826s Protection & Control (826s Marguerite Lake) repairing DGA Device on 901T at 826s 31 Hours
Continuous		  
24-Apr-25 09:30 24-Apr-25 15:30 ATCO Outage 939s 910 (939s Livock), 939s 911 (939s Livock), 939s 903T (939s Livock), 7L125 (939s Livock - 950s Germain) trip coil testing 6 Hours
Continuous		  
24-Apr-25 10:00 24-Apr-25 14:00 ALTALINK Outage 54s 706N (54s Fort Saskatchewan) Replace failing SF6 gauges and top up low gas. 4 Hours
Daily		  
24-Apr-25 10:00 02-May-25 12:00 ATCO, ALBIAN Outage 920s 902T (920s Jackpine), 919s 907 (919s Hartley), 920s 902 (920s Jackpine) Work to be done in coordination with CNRL upon completion of their 920s outage on 901T
919s - 907 Breaker Complete
920s - 902 Breaker Complete
920s - 902T Major Testing		 8.08 Days
Continuous		  
24-Apr-25 11:01 24-Apr-25 13:00 ATCO Outage 749s 704 (749s Flyingshot Lake) PRC-005 - TRIP COIL TESTING - BREAKER 704 @ 749S 119 Mins
Continuous		  
24-Apr-25 13:01 24-Apr-25 15:00 ATCO Outage 749s 705 (749s Flyingshot Lake) PRC-005 - TRIP COIL TESTING - BREAKER 705 @ 749S 119 Mins
Continuous		  
25-Apr-25 08:00 25-Apr-25 16:00 ENMAX Outage 3.82L (SS-3 - SS-8), 3B138-3.82 (SS-3) hv breaker maintenance - 3B138-3.82 8 Hours
Continuous		  
25-Apr-25 09:00 25-Apr-25 17:30 ATCO Outage 2075s ACF24 (2075s Newell) filter bank ac maintenance 8.5 Hours
Continuous		  

Prepared On:   2025-04-16   15:04:11

This document and the information contained herein are based upon information and data which by their nature contain a degree of uncertainty and are subject to change. In addition, this document may contain information and data from public sources and/or third parties, which have been assumed to be accurate and complete and have not been verified. Accordingly, the Independent System Operator, operating as the Alberta Electric System Operator (the "AESO") makes no warranty, representation or guarantee, express or implied, with respect to this document or the information contained herein, including, but not limited to, any warranty, representation or guarantee of accuracy, completeness, timeliness, reliability, availability, absence of computer virus, non- infringement, merchantability or suitability for any purpose. Under no circumstances will the AESO, its members, officers, employees, contractors or agents, or any of their respective affiliates, be liable for any errors or omissions in, or any losses, damages or claims whatsoever, whether in contract, tort or otherwise, arising from use of or reliance upon, this document or any information contained herein.

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