Alberta Electric System Operator
System Co-ordination Plan
2026-03-05 to 2026-03-13
Approved Outages

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From To Owner Type Element Scheduled Activity Date/Time Comments Interconnection
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-Jun-26 14:29 ALTALINK Outage 157s C1 (157s Lac La Biche) forced outage 676.03 Days
Continuous		  
20-Mar-25 08:00 20-Mar-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 365.38 Days
Continuous		  
31-Mar-25 07:00 01-May-26 17:00 EPCOR TE Protection & Control (Woodcroft) Woodcroft: protection blocking for merging unit and protection upgrade. 396.42 Days
Continuous		  
14-May-25 08:00 13-Mar-26 16:00 ENMAX TE Protection & Control (SS-32) 32sub 138kV autoswitching protection outage 303.33 Days
Continuous		  
22-Jul-25 08:30 31-Mar-26 16:30 ALTALINK Outage 263s C1 (263s Strachan) forced outage 252.33 Days
Continuous		  
25-Jul-25 17:01 17-Apr-26 17:00 EPCOR Outage T2 (EP Riverview) bushing test failure (found during OE110184) 266 Days
Continuous		  
12-Sep-25 08:00 19-Jun-26 16:00 ENMAX Outage 33.1TR (SS-33) tap changer refurbishments. soak test required 280.33 Days
Continuous		  
27-Nov-25 08:30 27-Nov-27 16:30 ALTALINK TE 89s Protection & Control (89s Ellerslie) DSP card replacements on1057L B87/L3 and B240B1 B87/240B1 730.33 Days
Daily		  
04-Jan-26 08:00 02-Sep-26 16:00 SUNCOR Outage 29EDD-34 260kV Bus 29PP-45 (29EDD-34), 29EDD-34 29-952-113 (29EDD-34) urgent repairs on 29PT-224 at 29EDD34 on 29PP-45 bus 241.29 Days
Continuous		  
05-Jan-26 08:00 22-Mar-26 16:00 ENMAX Outage 1.80L (SS-1 - SS-28), 28B138-1.80 (SS-28) 1 sub transmission line cut over 76.29 Days
Continuous		  
05-Jan-26 08:00 22-Mar-26 16:00 ENMAX Outage 1.81L (SS-1 - SS-20), 20B138-1.81 (SS-20) 1 sub transmission line cut over 76.29 Days
Continuous		  
08-Jan-26 15:00 27-Mar-26 17:00 ALTALINK Outage 42s C2 (42s Sarcee) forced outage 78.04 Days
Daily		  
12-Jan-26 07:00 03-Apr-26 17:00 EPCOR TE 330p Protection & Control (330p Genesee) protect blocking, annual relay maintenance and password changes 81.38 Days
Continuous		  
12-Jan-26 07:00 01-May-26 17:00 EPCOR TE Protection & Control (Rossdale) protection blocking, relay maintenance 109.38 Days
Continuous		  
12-Jan-26 07:00 03-Apr-26 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) protection blocking, relay maintenance 81.38 Days
Continuous		  
17-Jan-26 11:00 27-Mar-26 17:00 BHE Canada Outage 120s C2 (120s Picture Butte) forced outage 69.21 Days
Continuous		  
21-Jan-26 08:00 30-Oct-26 16:00 ENMAX Outage 5.7TR (SS-5) 25kV switchgear replacement 282.29 Days
Continuous		  
03-Feb-26 09:00 30-Jun-26 17:00 ATCO TE 972s RTU/SCADA (972s Tinchebray) config changes needed throughout the CETO project 147.29 Days
Continuous		  
06-Feb-26 07:00 15-Mar-26 17:30 ALTALINK RB 793L (87s Gaetz - 535s Joffre) crews will be setting structures on 986L/962L STR’s 41-56 & 24-41 and will require a Reclosure Block on
793L		 37.4 Days
Daily		  
08-Feb-26 07:00 06-Apr-26 18:00 ALTALINK Outage 799L (235s Entwistle - 443s South Mayerthorpe), 235s 799N (235s Entwistle) 799L rebuild between Str 721B-758 (Section B) 57.42 Days
Continuous		  
09-Feb-26 08:00 13-Mar-26 16:00 ENMAX TE Protection & Control (SS-32) 32sub zone 31 and zone 32 bus differential protection outage 32.29 Days
Continuous		  
09-Feb-26 09:00 26-Jun-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) block all 50BF protection until cutovers and associated commissioning are complete 137.29 Days
Continuous		  
17-Feb-26 12:00 09-Apr-26 13:31 ATCO TE 882s RTU/SCADA (882s Triangle) updating RTU/station controller configuration during SCADA upgrade project 51.02 Days
Continuous		  
17-Feb-26 13:00 12-Mar-26 13:00 ATCO TE 733s Protection & Control (733s Simonette), 733s RTU/SCADA (733s Simonette) tying in RAS circuits to relays, updating RTU 22.96 Days
Continuous		  
17-Feb-26 17:30 12-Mar-26 17:30 ALTALINK RB 202L (178s Cynthia - 202AL tap), 202L (61s Lodgepole - 202AL tap) safety requirement; create/close 202L open point 'B' 22.96 Days
Continuous		  
23-Feb-26 07:00 23-Mar-26 07:00 EPCOR Outage 805s T3 (805s Jasper) bushing change 27.96 Days
Continuous		  
23-Feb-26 07:00 06-Mar-26 17:00 EPCOR TE Protection & Control (EPCOR Hardisty) relay maintenance 11.42 Days
Continuous		  
24-Feb-26 08:00 10-Mar-26 16:00 Syncrude Outage 11 (Aurora), 12 (Aurora), 13 (Aurora), T3 (Aurora), UT1 (Aurora), 11A (Aurora), 11B (Aurora), 12A (Aurora), 12B (Aurora), 13A (Aurora), 13B (Aurora), 89-15 (Aurora), 89-16 (Aurora), G20 (Aurora) zone 6, 6 year PM 14.29 Days
Continuous		  
25-Feb-26 14:00 12-Mar-26 14:00 ALTALINK Outage 202L (178s Cynthia - 202AL tap), 178s 202X (178s Cynthia) installing a new deadend and air break (202L336B) 14.96 Days
Continuous		  
26-Feb-26 07:00 06-Mar-26 18:00 ATCO, ALTALINK IO 807AL (402s Scotford Expansion One - 807L tap) isolate line for Altalink scope: replace 807L structures 67B-71 and reconductor 67A-72. 8.46 Days
Continuous		  
26-Feb-26 07:00 06-Mar-26 18:00 ALTALINK, ATCO Outage 807L (410s Josephburg - 807AL tap), 807L (233s Beamer - 807AL tap), 807AL (402s Scotford Expansion One - 807L tap), 233s 807X (233s Beamer) replace 807L structures 67B-71 and reconductor 67A-72 8.46 Days
Continuous		  
01-Mar-26 07:00 05-Mar-26 17:30 ALTALINK RB 942L (71s Lamoureux - 681s Bannerman) 942L RB to string underneath the existing 942L on 807L 4.44 Days
Continuous		  
01-Mar-26 07:00 05-Mar-26 17:30 ALTALINK RB 1061L (12s Heartland - 681s Bannerman) 1061L RB to string underneath the existing 1061L on 807L 4.44 Days
Continuous		  
01-Mar-26 07:30 05-Mar-26 17:00 ALTALINK RB 708AL (388s Riverside - 708L tap), 708L (233s Beamer - 708AL tap), 708L (71s Lamoureux - 708AL tap) 708L RB to modify 807L and install new conductor at structures 72-67A 4.4 Days
Continuous		  
02-Mar-26 07:00 06-Mar-26 17:00 EPCOR Outage 557s T2 (557s Castle Downs) Castle Downs: tx2 surge arrestor lcr 4.42 Days
Continuous		  
02-Mar-26 07:00 12-Mar-26 16:00 ALTALINK TE 275s RTU/SCADA (275s Jenner) update RTU to modify alarms for 944L line protection 10.33 Days
Continuous		  
02-Mar-26 07:00 12-Mar-26 16:00 ALTALINK TE 132s RTU/SCADA (132s Ware Junction) visibility outage 10.33 Days
Continuous		  
02-Mar-26 07:00 06-Mar-26 17:00 EPCOR Outage 987s GT2 (987s Clover Bar), 987s CGB2 (987s Clover Bar) outage 4.42 Days
Continuous		  
02-Mar-26 07:00 05-Mar-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) RTU config update 3.42 Days
Daily		  
02-Mar-26 07:00 06-Mar-26 17:00 EPCOR Outage T4 (Rossdale), R724 (Rossdale), RR729 (Rossdale), RAB4 (Rossdale) Rossdale: TX4 zone 4.42 Days
Continuous		  
02-Mar-26 08:00 13-Mar-26 16:00 ENMAX Outage 32B138-32BT5 (SS-32) 32BT5 p&c cut over 11.29 Days
Continuous		  
02-Mar-26 08:00 19-Mar-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole and cross arm replacement 17.29 Days
Continuous		  
02-Mar-26 08:00 05-Mar-26 07:30 ALTALINK Outage 102s 552 (102s Langdon), 102s 252 (102s Langdon), 102s T4 (102s Langdon), 102s SVC (102s Langdon), 102s 7189 (102s Langdon) SVC control upgrade finish and annual fire system maintenance 2.98 Days
Continuous		 AB-BC
02-Mar-26 08:00 07-Mar-26 17:00 ALTALINK RB 1038L (138s Windy Flats - 266s SC1), 1038L (237s Foothills - 266s SC1) south crew will be doing component replacement 5.38 Days
Continuous		  
02-Mar-26 08:00 06-Mar-26 17:00 ALTALINK RB 443L (55s Olds - 214s Innisfail) south crew will be doing structure replacements 4.38 Days
Continuous		  
02-Mar-26 08:00 06-Mar-26 16:00 ALTALINK Outage 263s C1 (263s Strachan), 263s 35 (263s Strachan) replace CTs 4.33 Days
Continuous		  
02-Mar-26 08:00 05-Mar-26 16:00 ALTALINK TE 899s RTU/SCADA (899s Edgerton) supervisory outage required during replacement of 749N protections 3.33 Days
Continuous		  
02-Mar-26 08:00 05-Mar-26 16:00 ALTALINK TE 272s RTU/SCADA (272s Springbank), AltaLink Telecom Equipment 1 firewall (scada) 1 mpls node 1 mpls raw socket 3.33 Days
Continuous		  
02-Mar-26 08:00 13-Mar-26 16:00 ENMAX Outage 8.5TR (SS-8) 8.5TR - repair leak, tap changer inspection & reversing switch check 11.29 Days
Continuous		  
02-Mar-26 08:00 06-Mar-26 16:00 ALTALINK TE 102s RTU/SCADA (102s Langdon) updating RTU configuration for T4 GMD metering and alarms. 4.33 Days
Continuous		  
02-Mar-26 09:00 16-Mar-26 12:00 ATCO Outage 882s 701T (882s Triangle), 882s 701 (882s Triangle) cutover and commission new transformer protection and SCADA station controller
 14.08 Days
Continuous		  
02-Mar-26 09:00 12-Mar-26 17:00 Lethbridge Outage 813L (146s MacDonald - 241s Uplands), 146s 813L (146s Macdonald), 146s 1 (146s Macdonald), 241s 813L (241s Uplands) replacing 146s1 disconnect switch and 146s PTL1-CVT 10.29 Days
Continuous		  
02-Mar-26 09:00 16-Mar-26 12:00 ATCO TE 882s Protection & Control (882s Triangle) demo existing protection and install/commission new protection on 701T 14.08 Days
Continuous		  
02-Mar-26 10:00 11-Mar-26 18:00 ATCO RB 7L08 (830s Carmon - 834s Wesley Creek) maintenance program 9.29 Days
Continuous		  
02-Mar-26 12:00 05-Mar-26 16:00 ATCO TE 898s Protection & Control (898s Heart Lake) PRC-005 relay testing, relay software vulnerability upgrades 3.17 Days
Continuous		  
02-Mar-26 13:00 05-Mar-26 16:00 ALTALINK, ATCO Outage 899s 749N (899s Edgerton), 749L (899s Edgerton - 7LB749 tap) replace "A" protections - A21/L8 LZ921 3.13 Days
Continuous		  
02-Mar-26 13:00 06-Mar-26 17:00 ATCO, ALTALINK Outage 749L (899s Edgerton - 7LB749 tap), 899s 749N (899s Edgerton) 749L line maintenance 4.17 Days
Continuous		  
03-Mar-26 07:00 09-Mar-26 17:00 ALTALINK RB 951L (132s Ware Junction - 275s Jenner) connection of 944L with 944AL1 for new 1080s substation 6.38 Days
Continuous		  
03-Mar-26 08:00 09-Mar-26 17:00 ALTALINK Outage 944L (132s Ware Junction - 275s Jenner), 132s 51 (132s Ware Junction), 132s 47 (132s Ware Junction), 275s 5 (275s Jenner), 275s 2 (275s Jenner), 132s 944 (132s Ware Junction), 275s 944W (275s Jenner) replace line relays, comm cards and update settings on protections at 275s Jenner
6.33 Days
Continuous		  
03-Mar-26 08:00 05-Mar-26 17:00 ALTALINK Outage 1037L (138s Windy Flats - 266s SC1), 1037L (237s Foothills - 266s SC1), 266s 189 (266s SC1), 266s 289 (266s SC1), 266s 1037L FSC1 (266s SC1) component replacement
2.38 Days
Continuous		  
03-Mar-26 08:00 05-Mar-26 16:00 ENMAX Outage 31.1TR (SS-31) relay protection test 2.33 Days
Continuous		  
03-Mar-26 09:00 05-Mar-26 13:00 BCH Outage T7 (BCH Natal) ETM install 2.17 Days
Continuous		 AB-BC
04-Mar-26 07:00 06-Mar-26 17:00 EPCOR Outage 816s T1 (816s Petrolia), 816s P2402 (816s Petrolia), 816s P2401 (816s Petrolia), 816s PAB1 (816s Petrolia) petrolia: TX1 relay maintenance 2.42 Days
Continuous		  
04-Mar-26 08:00 05-Mar-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 185s RTU/SCADA (185s Bretville), 286s RTU/SCADA (286s Yasa) firewall and MPLS upgrade, various TPR will be reroute 1.33 Days
Continuous		  
04-Mar-26 08:00 05-Mar-26 16:00 ENMAX TE Protection & Control (SS-41) 41 sub BMR BT3 protection outage 1.33 Days
Continuous		  
04-Mar-26 08:00 06-Mar-26 17:00 ALTALINK RB 514BL (322s Cowley Ridge Windplant - 514L tap), 514L (396s Pincher Creek - 514BL tap), 514L (513s Lundbreck - 514BL tap) prep for line maintenance on 514L from STR 48-453, proximity 2.38 Days
Continuous		  
04-Mar-26 08:30 05-Mar-26 16:00 ALTALINK TE 320p RTU/SCADA (320P Keephills) supervisory outage required - camlin rep to assist with SCADA deficiencies at RTU and camlin unit 31.5 Hours
Continuous		  
04-Mar-26 23:30 05-Mar-26 02:30 ALTALINK Outage 62s T1 (62s Brazeau Plant), 62s 1 (62s Brazeau Plant) maintenance 3 Hours
Continuous		  
05-Mar-26 07:00 08-Mar-26 16:00 ATCO, ALTALINK Outage 9L913 (69s North Barrhead - 732s Mitsue), 69s 913N (69s North Barrhead) emergency changing white tag poles from test and treat ( Str 16,69 and 503 ) 3.33 Days
Continuous		  
05-Mar-26 07:00 08-Mar-26 16:00 ALTALINK, ATCO IO 69s 913N (69s North Barrhead), 913L (69s North Barrhead - 732s Mitsue) emergency changing white tag poles from test and treat ( Str 16,69 and 503 ) 3.33 Days
Continuous		  
05-Mar-26 08:00 05-Mar-26 16:00 ALTALINK Outage 87s 952 (87s Gaetz) 87s952 outage to trip test from new c60 relays, trip new breakers from 952 BF protection 8 Hours
Daily		  
05-Mar-26 08:00 06-Mar-26 16:00 ALTALINK Trans Test 102s T4 (102s Langdon), 102s SVC (102s Langdon) After maintenance live commissioning testing 1.33 Days
Continuous		  
05-Mar-26 08:30 05-Mar-26 16:00 ALTALINK TE 180s RTU/SCADA (180s Cope Creek) upgrade firmware on RTU and trouble shoot alarms 7.5 Hours
Continuous		  
05-Mar-26 09:00 05-Mar-26 16:00 ALTALINK Outage 523s C1 (523s Bullshead), 523s 33 (523s Bullshead) PRC maintenance on C1 cap bank protections 7 Hours
Continuous		  
05-Mar-26 10:00 05-Mar-26 12:00 ALTALINK TE AltaLink Telecom Equipment, 250p RTU/SCADA (250P Bighorn Plant), 304s RTU/SCADA (304s Shell Limestone), 21s RTU/SCADA (21s Marion), 68s RTU/SCADA (68s Willesden Green), 115s RTU/SCADA (115s Mount Allan), 165s RTU/SCADA (165s Gainford), 180s RTU/SCADA (180s Cope Creek), 271s RTU/SCADA (271s Shell Jumping Pound), 406s RTU/SCADA (406s Fickle Lake), 411s RTU/SCADA (411s Obed), 512s RTU/SCADA (512s Hartell), 515s RTU/SCADA (515s Fedpipe Judy Creek), 527s RTU/SCADA (527s Coal Valley), 638s RTU/SCADA (638s Esso Judy Creek), 887s RTU/SCADA (887s Carson Creek), 975s RTU/SCADA (975s Dalehurst), 996s RTU/SCADA (996s Imperial Oil Carson Lake) update configuration
2 Hours
Continuous		  
05-Mar-26 12:00 05-Mar-26 17:00 ALTALINK TE 120s RTU/SCADA (120s Picture Butte) RTU outage 5 Hours
Continuous		  
06-Mar-26 07:00 06-Mar-26 17:00 EPCOR Outage 1098L (EP 805s Jasper - Poundmaker), EP 805s J2407 (EP 805s Jasper), EP 805s J2401 (EP 805s Jasper) emergency outage for large equipment access for TX3 bushing replacement 10 Hours
Continuous		  
06-Mar-26 07:30 07-Mar-26 17:30 ALTALINK RB 1072L (103s Goose Lake - 205s Castle Rock Ridge) south crew will be doing component replacement on 1072L15 1.42 Days
Daily		  
06-Mar-26 07:30 08-Mar-26 17:30 ALTALINK RB 994L (103s Goose Lake - 312s Fidler) south crew will be doing component replacement on 1072L15 2.38 Days
Daily		  
06-Mar-26 07:30 08-Mar-26 17:30 ALTALINK RB 1071L (205s Castle Rock Ridge - 312s Fidler) south crew will be doing component replacement on 1072L15 2.38 Days
Daily		  
06-Mar-26 08:00 07-Mar-26 17:00 ALTALINK RB 1037L (138s Windy Flats - 266s SC1), 1037L (237s Foothills - 266s SC1) south crew will be doing component replacement on 1037L (STR 280-342) live line 1.38 Days
Continuous		  
06-Mar-26 08:00 06-Mar-26 16:00 ALTALINK Outage 87s 252 (87s Gaetz) 87s252 outage to trip test from new c60 relays, trip new breakers from 252 BF protection 8 Hours
Daily		  
06-Mar-26 08:00 06-Mar-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D81 protection outage. relays, lockout testing 8 Hours
Continuous		  
06-Mar-26 16:00 10-Mar-26 13:00 BCH Outage T8 (BCH Natal) ETM install 3.83 Days
Continuous		 AB-BC
06-Mar-26 17:00 13-Nov-26 17:00 EPCOR Outage T1 (Woodcroft) woodcroft: TX1 LCR civil 252 Days
Continuous		  
07-Mar-26 07:00 07-Mar-26 17:00 EPCOR TE EP 511s RTU/SCADA (EP 511s Victoria) RTU outage for substation firewall replacement 10 Hours
Continuous		  
07-Mar-26 08:00 07-Mar-26 16:00 ALTALINK Outage 87s 852 (87s Gaetz) 87s852 outage to trip test from new c60 relays. Trip new breakers from 852 BF protection. 8 Hours
Daily		  
07-Mar-26 08:00 08-Mar-26 17:00 ALTALINK Outage 289s 1152 (289s Saunders Lake), 289s 1252 (289s Saunders Lake), 40s 858N (40s Wetaskiwin), 858L (40s Wetaskiwin - 289s Saunders Lake) Replacing cross arms and insulators on structure 196. Replacing structures 197, 199, 200 1.33 Days
Continuous		  
07-Mar-26 08:00 07-Mar-26 16:00 ALTALINK Outage 33s 2 (33s Spray) maintenance 8 Hours
Continuous		  
08-Mar-26 08:00 08-Mar-26 16:00 ALTALINK Outage 87s 1052 (87s Gaetz) 87s1052 outage to trip test from new c60 relays. Trip new breakers from 1052 BF protection. 8 Hours
Daily		  
08-Mar-26 08:00 08-Mar-26 17:00 ALTALINK Outage 1072L (103s Goose Lake - 205s Castle Rock Ridge) South Crew will be doing component replacement on 1072L15 9 Hours
Daily		  
08-Mar-26 08:00 11-Mar-26 17:00 EPCOR Outage T3 (Rossdale), R723 (Rossdale), R724 (Rossdale) Rossdale: TX3 Zone, Duct Bank Removal and Leak Repair 3.38 Days
Continuous		  
08-Mar-26 08:30 24-Mar-26 16:00 ENMAX Outage 38.83L (SS-38 - SS-39), 39.3TR (SS-39), 39.1TR (SS-39) HV SW Replacement. 39SW86, 39SW89, MD-39.1TR, 39.3TR surge arrestor replacement, 38.83L surge arrestor 16.31 Days
Continuous		  
09-Mar-26 07:00 10-Mar-26 17:00 ALTALINK, EPCOR Outage 908L (89s Ellerslie - 816s Petrolia), 816s P2401 (816s Petrolia), 816s P2406 (816s Petrolia) relay maintenance 1.42 Days
Continuous		  
09-Mar-26 07:00 13-Mar-26 17:00 EPCOR Outage 987s GT3 (987s Clover Bar), 987s CGB3 (987s Clover Bar) repair GDS3 4.42 Days
Continuous		  
09-Mar-26 07:00 12-Mar-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) change SCADA for CETO project 3.42 Days
Continuous		  
09-Mar-26 07:00 09-Mar-26 17:00 EPCOR TE APS# 172 Garneau - Meadowlark Reconfiguration Scheme communication outage for #520 fiber circuit move 10 Hours
Continuous		  
09-Mar-26 07:00 27-Mar-26 17:00 EPCOR TE 816s Protection & Control (816s Petrolia) relay maintenance 18.42 Days
Continuous		  
09-Mar-26 07:30 09-Mar-26 17:30 ALTALINK RB 1053L (132s Ware Junction - 324s Cassils) doing a OPGW repair at 1053L24 10 Hours
Daily		  
09-Mar-26 08:00 13-Mar-26 17:00 ALTALINK RB 514BL (322s Cowley Ridge Windplant - 514L tap), 514L (396s Pincher Creek - 514BL tap), 514L (513s Lundbreck - 514BL tap) south crew will be doing line maintenance on 514L from STR 48-453 4.38 Days
Continuous		  
09-Mar-26 08:00 12-Mar-26 16:00 ALTALINK TE 108s RTU/SCADA (108s Amelia) update RTU configuration for BMI project 3.33 Days
Continuous		  
09-Mar-26 08:00 13-Mar-26 17:00 ALTALINK Outage 749L (899s Edgerton - 749AL tap) 749L Line maintenance 4.38 Days
Continuous		  
09-Mar-26 08:00 12-Mar-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 233s RTU/SCADA (233s Beamer) upgrade MPLS and firewall 3.33 Days
Continuous		  
09-Mar-26 08:00 12-Mar-26 16:00 ALTALINK TE 324s RTU/SCADA (324s Cassils) 2026 firewall program - 1 firewall 3.33 Days
Continuous		  
09-Mar-26 08:00 16-Mar-26 16:00 ATCO, USPCE RB 7L15 (841s Long Lake - 856s Kinosis) pole changes 7.33 Days
Continuous		  
09-Mar-26 08:00 13-Mar-26 17:00 ALTALINK Outage 712L (99s North St. Albert - 595s Spruce Grove), 595s 712 (595s Spruce Grove), 99s 712X (99s North St. Albert) component replacement on 712L (STR 81 - 166) 4.38 Days
Continuous		  
09-Mar-26 08:00 09-Mar-26 16:00 ENMAX TE Protection & Control (SS-37) 37sub BMR 81 protection outage for settings changes 8 Hours
Continuous		  
09-Mar-26 08:00 09-Mar-26 17:00 ALTALINK RB 103s 552 (103s Goose Lake), 103s 652 (103s Goose Lake), 312s 552 (312s Fidler), 312s 952 (312s Fidler), 994L (103s Goose Lake - 312s Fidler) proximity to the 1072L damper replacement STR 15 - 39 9 Hours
Continuous		  
09-Mar-26 08:00 09-Mar-26 17:00 ALTALINK RB 103s 252 (103s Goose Lake), 103s 352 (103s Goose Lake), 205s 152 (205s Castle Rock Ridge), 205s 252 (205s Castle Rock Ridge), 1072L (103s Goose Lake - 205s Castle Rock Ridge) replacing O/H dampers from on 1072L from STR 15 9 Hours
Continuous		  
09-Mar-26 08:00 09-Mar-26 17:00 ALTALINK RB 205s 352 (205s Castle Rock Ridge), 205s 452 (205s Castle Rock Ridge), 312s 852 (312s Fidler), 312s 952 (312s Fidler), 1071L (205s Castle Rock Ridge - 312s Fidler) proximity to the 1072L damper replacements STR 15-39 9 Hours
Continuous		  
09-Mar-26 08:00 09-Mar-26 18:00 ENMAX Outage 24.2TR (SS-24) 24BA25-24.2TR breaker stuck in cell - install racking mech 10 Hours
Continuous		  
09-Mar-26 09:00 09-Mar-26 15:00 ALTALINK, ENBRIDGE RB 1042L (485s Blackspring Ridge - 554s Travers) replace Line damper on Str 47 6 Hours
Continuous		  
09-Mar-26 09:00 13-Mar-26 17:00 ALTALINK Outage 776L (308s Albchem Beaverhill Creek - 410s Josephburg), 308s 776W (308s Albchem Beaverhill Creek) replace CT associated with 308s776W breaker 4.33 Days
Continuous		  
09-Mar-26 11:00 09-Mar-26 17:00 ALTALINK TE 38s Protection & Control (38s East Edmonton) relay maintenance on Non-Redundant protections: S7552 11(96/25SC) ,S3152 96/3152, S3052 96/3052, S1152 96/79/1152 6 Hours
Continuous		  
09-Mar-26 11:30 09-Mar-26 16:00 ALTALINK Outage 305s C1 (305s Acheson) breaker maintenance 4.5 Hours
Continuous		  
09-Mar-26 12:00 09-Mar-26 17:00 ALTALINK TE 150s Protection & Control (150s Clyde) standard relay maintenance 5 Hours
Continuous		  
09-Mar-26 13:00 10-Mar-26 16:00 ALTALINK TE 61s Protection & Control (61s Lodgepole) standard relay maintenance 27 Hours
Continuous		  
09-Mar-26 13:15 09-Mar-26 16:00 ALTALINK Outage 149s C1 (149s Nisku) 138kV breaker maintenance 2.75 Hours
Continuous		  
09-Mar-26 13:30 09-Mar-26 16:00 ALTALINK Outage 63s 26 (63s Red Deer), 63s T3 (63s Red Deer) 63s26 PRC5 breaker maintenance and first trip test 2.5 Hours
Daily		  
09-Mar-26 14:00 15-Mar-26 18:00 ATCO Outage 7L36 (820s Hangingstone - 2009s Willow Lake), 820s 701 (820s Hangingstone), 2009s 707 (2009s Willow Lake), 2009s 708 (2009s Willow Lake) 7L36 pole change 6.17 Days
Continuous		  
09-Mar-26 14:00 10-Mar-26 16:00 ALTALINK Outage 191s T1 (191s N.W. Cardiff) install bird cover on 25kV Bus 1, 191s338N & 191s335W 26 Hours
Continuous		  
10-Mar-26 08:00 11-Mar-26 17:00 ENMAX, ALTALINK RB 932L (74s Janet - SS-162) south crew will be doing heli work on 932L STR 41-43 , see also 929L RB required due to proximity 26-10119 (common tower) 1.38 Days
Continuous		  
10-Mar-26 08:00 11-Mar-26 16:00 ALTALINK RB 929L (74S Janet - 287s Hazelwood) south crew will be doing heli work on 932L STR 41-43 1.33 Days
Continuous		  
10-Mar-26 08:00 10-Mar-26 17:00 ATCO Outage 7L63 (788s Hotchkiss - 7LA63 tap), 788s 703 (788s Hotchkiss) emergency changing rotten cross arm str 86 and str 1115 9 Hours
Continuous		  
10-Mar-26 08:00 12-Mar-26 16:00 ALTALINK TE 504s RTU/SCADA (504s Queenstown), AltaLink Telecom Equipment 202 firewall program - 1 firewall, 1 LAN switch, 2 mpls node 2.33 Days
Continuous		  
10-Mar-26 08:00 11-Mar-26 17:00 ALTALINK RB 738L (38s East Edmonton - 738AL tap) RB for imperial oil work 1.38 Days
Continuous		  
10-Mar-26 08:00 12-Mar-26 16:00 ALTALINK TE 419s Protection & Control (419s Chestermere) PRC maintenance on redundant protection: 765L A21/L2 SEL311C, 765L B21/L2 URD60, non- redundant recloser S252 96/79/252 URC60 no more than 6 hrs. 2.33 Days
Continuous		  
10-Mar-26 08:00 10-Mar-26 17:00 ALTALINK RB 799L (77s Sagitawah - 443s South Mayerthorpe) reclosure block on 799L to complete geo-technical investigation at structures 603 & 638 9 Hours
Continuous		  
10-Mar-26 08:00 11-Mar-26 16:00 ENMAX TE Protection & Control (SS-10) SS-10 auto switching protection outage, relay 10RLY138-10.ASW, install ITBs 1.33 Days
Continuous		  
10-Mar-26 08:00 11-Mar-26 16:00 ENMAX TE Protection & Control (SS-41) SS-41 autoswitching protection scheme outage. relay protection test - 41RLY138-41.ASW 1.33 Days
Continuous		  
10-Mar-26 08:00 10-Mar-26 14:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) settings change 6 Hours
Continuous		  
10-Mar-26 08:00 15-Mar-26 15:00 ATCO RB 9L23 (848s Ruth Lake - 977s Salt Creek) work underneath on 7L36 (L-G Mitigation Spans 7L36-38) 5.29 Days
Continuous		  
10-Mar-26 08:30 10-Mar-26 11:30 ALTALINK Outage 432s 790 (432s Carvel) first trip & PRC5 maint, switch order to include first trip 3 Hours
Continuous		  
10-Mar-26 09:00 14-Apr-26 17:00 ATCO Outage 972s 240kV Bus 900BS2 (972s Tinchebray) install breakers 905/906, 905CT/906CT, switches 905A/906B
On release leave Bkrs 905/906, 905A/905B, and 906A/906B closed as feed through (disable bkr trips), breaker 903 still protecting 9L93		 35.33 Days
Continuous		  
10-Mar-26 09:00 10-Mar-26 17:00 ALTALINK Outage 310p 1752 (310p Sundance) 240kV breaker maintenance 8 Hours
Continuous		  
10-Mar-26 09:00 10-Mar-26 11:30 ALTALINK Outage 38s 738W (38s East Edmonton) 38s738W breaker maintenance 2.5 Hours
Continuous		  
10-Mar-26 09:00 10-Mar-26 14:00 ATCO TE 778s RTU/SCADA (778s Big Valley) replacing old micro hard on site with new check point fire wall 5 Hours
Continuous		  
10-Mar-26 09:00 11-Mar-26 16:00 ALTALINK TE 103s Protection & Control (103s Goose Lake) PRC relay maintenance on: 893L, and 103s T1 relays, one at a time 893L RAS relays which are currently out of service 31 Hours
Continuous		  
10-Mar-26 09:00 10-Mar-26 16:00 ALTALINK TE 55s Protection & Control (55s Olds) PRC maint on the listed non redundant protection: B138B1, and U/F 81-1 B, redundant 443L B21/L1 LFZP111. 7 Hours
Continuous		  
10-Mar-26 09:00 11-Mar-26 20:00 SUNCOR TE 29EDD-2 Protection & Control (29EDD-2 Tar Island) fiber optic testing to troubleshoot 29PL6-6 'A" protection comm fail alarm, A protection will be isolated during this period 1.46 Days
Continuous		  
10-Mar-26 10:00 10-Mar-26 12:00 ENMAX, ALTALINK IO 28.80L (42s Sarcee - SS-28) 1 sub-Transmission line cut over 2 Hours
Continuous		  
10-Mar-26 10:00 30-Nov-26 17:00 ATCO TE 743s RTU/SCADA (743s Sarah Lake) throughout the course of the project, different apparatus are being replaced, RTU will be blocked prior to download 265.33 Days
Continuous		  
10-Mar-26 10:00 10-Mar-26 12:00 ALTALINK Outage 428s 19 (428s Namaka), 428s T1 (428s Namaka) 428s19 PRC5 maint. 2 Hours
Continuous		  
10-Mar-26 12:00 10-Mar-26 16:00 ALTALINK TE 338s RTU/SCADA (338s Cherhill) RTU database update 4 Hours
Continuous		  
10-Mar-26 13:30 10-Mar-26 16:30 ALTALINK Outage 896L (19s Wabamun - 432s Carvel), 432s 896 (432s Carvel) first trip & PRC5 maint,
include first trip in switch order		 3 Hours
Continuous		  
10-Mar-26 13:30 10-Mar-26 16:00 ALTALINK Outage 780L (38s East Edmonton - 522s Cooking Lake), 38s 780X (38s East Edmonton) breaker maintenance on 38s780X 138kV CB 2.5 Hours
Continuous		  
11-Mar-26 06:00 11-Mar-26 17:00 ATCO IO ATCO RTU/SCADA SOC2 Backup Control centre activation
11 Hours
Continuous		  
11-Mar-26 07:00 13-Mar-26 17:00 EPCOR Outage 816s T2 (816s Petrolia), 816s P2404 (816s Petrolia), 816s P2405 (816s Petrolia), 816s PAB2 (816s Petrolia) Petrolia: TX2 Relay Maintenance 2.42 Days
Continuous		  
11-Mar-26 07:00 11-Mar-26 17:00 EPCOR Outage 557s CD2401 (557s Castle Downs) Castledowns CD2401 switching demonstration (NAIT) 10 Hours
Continuous		  
11-Mar-26 08:00 16-Mar-26 17:00 ALTALINK Outage 728L (353s Plamondon - 405s Waupisoo), 405s 728 (405s Waupisoo), 353s 452 (353s Plamondon) 728L line maintenance. 5.38 Days
Continuous		  
11-Mar-26 08:00 11-Mar-26 16:00 ALTALINK TE 178s Protection & Control (178s Cynthia) Standard relay maintenance, redundant protections in place at all times. Exceptions; 138kV bus diff, no redundancy, protection to be OOS <4hr. Qualified switchman on site for the duration 8 Hours
Continuous		  
11-Mar-26 08:00 11-Mar-26 16:00 ALTALINK TE 320p Protection & Control (320P Keephills) standard relay maintenance 8 Hours
Continuous		  
11-Mar-26 08:30 11-Mar-26 16:00 ALTALINK, BCH TE 1201L (520s Bennett - BCH Cranbrook) test communication channels between 520s Bennett and Cranbrook Stations for PRC-012 compliance 7.5 Hours
Continuous		  
11-Mar-26 09:00 11-Mar-26 17:00 ATCO TE ATCO Telecom Equipment Jean Cote telecom equipment replacement 8 Hours
Continuous		  
11-Mar-26 09:00 11-Mar-26 11:30 ALTALINK Outage 535s 6052 (535s Joffre) maintenance & first trip 2.5 Hours
Continuous		  
11-Mar-26 09:00 11-Mar-26 11:30 ALTALINK Outage 410s 752 (410s Josephburg) 138 kV breaker maintenance 2.5 Hours
Continuous		  
11-Mar-26 09:00 11-Mar-26 17:00 ALTALINK, BCH TE 5L94 (BCH Cranbrook - 102s Langdon) BCH end to end RAS testing with AltaLink 8 Hours
Continuous		 AB-BC
11-Mar-26 09:30 11-Mar-26 16:00 ALTALINK Outage 310p 2052 (310p Sundance) 240 kV breaker maintenance 6.5 Hours
Continuous		  
11-Mar-26 10:00 11-Mar-26 16:00 ALTALINK TE 250p RTU/SCADA (250P Bighorn Plant) update SCADA configuration 6 Hours
Continuous		  
11-Mar-26 11:00 11-Mar-26 12:30 ALTALINK, ATCO Outage 347s 199W (347s AML Fox Creek), 741s 702 (741s ATC Fox Creek) urgent repair - 347s199W 138 kV CB low gas top up 90 Mins
Continuous		  
11-Mar-26 13:30 11-Mar-26 16:00 ALTALINK Outage 410s 852 (410s Josephburg) 138 kV breaker maintenance 2.5 Hours
Continuous		  
11-Mar-26 13:45 11-Mar-26 16:00 ALTALINK Outage 535s 6552 (535s Joffre), 535s C1 (535s Joffre) breaker maintenance 2.25 Hours
Continuous		  
12-Mar-26 07:00 12-Mar-26 17:00 EPCOR Outage R723 (Rossdale), R721 (Rossdale), T2 (Rossdale) Rossdale: RDS5 Repair 10 Hours
Continuous		  
12-Mar-26 08:00 13-Mar-26 18:00 ENMAX, ALTALINK Outage 7.82L (42s Sarcee - SS-7) Replace connection point on shield wire weld tabs on structure 1.42 Days
Continuous		  
12-Mar-26 08:00 13-Mar-26 17:00 ALTALINK RB 174L (197s Bardo - 289s Saunders Lake) line maintenance on 858L (adjacent to 174L)
1.38 Days
Continuous		  
12-Mar-26 08:00 12-Mar-26 16:00 ALTALINK TE 237s Protection & Control (237s Foothills) PRC maintenance on 237s 240kV bus 1 8 Hours
Continuous		  
12-Mar-26 08:00 12-Mar-26 16:00 ALTALINK TE 138s RTU/SCADA (138s Windy Flats) updating RTU config to meet standards 8 Hours
Daily		  
12-Mar-26 08:00 12-Mar-26 16:00 ALTALINK TE 62s Protection & Control (62s Brazeau Plant) standard relay maintenance
8 Hours
Continuous		  
12-Mar-26 08:00 12-Mar-26 20:00 SUNCOR TE 29PL9-15 (29EDD-34 - 29EDD-56) 29PL9-15 (PML7550) momm failure require meter replacement 12 Hours
Continuous		  
12-Mar-26 08:00 12-Mar-26 16:00 ENMAX TE Protection & Control (SS-2) SS-2 86 BF-D82 protection outage - relay lockout testing. 8 Hours
Continuous		  
12-Mar-26 08:00 12-Mar-26 16:00 ENMAX, ALTALINK TE 36.81L (44s Bearspaw Plant - SS-36) 36.81L A protection outage - I&R SS-36 36.81L GE L90 internal battery fail 8 Hours
Continuous		  
12-Mar-26 08:30 12-Mar-26 16:30 ALTALINK TE 993s Protection & Control (993s Abee) DSP card rplacement and FW updates - CRU 8 Hours
Continuous		  
12-Mar-26 08:30 13-Mar-26 18:00 ALTALINK, ENMAX Outage 42s 7 (42s Sarcee), 7.82L (42s Sarcee - SS-7) Replace connection point on shield wire weld tabs on structure 1.4 Days
Continuous		  
12-Mar-26 09:30 12-Mar-26 16:00 ALTALINK Outage 310p 552 (310p Sundance) 240kV breaker maintenance 6.5 Hours
Continuous		  
12-Mar-26 10:00 12-Mar-26 16:00 ATCO TE 825s Whitefish Lake RTU/SCADA 825S CIP password changes 6 Hours
Continuous		  
12-Mar-26 12:00 12-Mar-26 17:00 ALTALINK TE 120s RTU/SCADA (120s Picture Butte) RTU outage 5 Hours
Continuous		  
12-Mar-26 14:00 12-Mar-26 17:00 ALTALINK Outage 202L (178s Cynthia - 202AL tap), 178s 202X (178s Cynthia) close 202L open point 'B' 3 Hours
Daily		  
13-Mar-26 07:00 13-Mar-26 17:00 EPCOR Outage RG7210 (Rossdale), 72RG1 (Garneau - Rossdale) (SF6) breaker maintenance 10 Hours
Continuous		  
13-Mar-26 07:15 13-Mar-26 17:45 ALTALINK Outage 199L (268s Whitecourt - 199AL tap) replace keeper keys at structure 375 10.5 Hours
Daily		  

Prepared On:   2026-03-04   15:06:42

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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