Alberta Electric System Operator
System Co-ordination Plan
2026-01-29 to 2026-02-06
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		  
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 256s C1 (256s Harmattan) forced outage 365.38 Days
Continuous		  
31-Mar-25 07:00 27-Feb-26 17:00 EPCOR TE Protection & Control (Woodcroft) Woodcroft: protection blocking for merging unit and protection upgrade. 333.46 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		  
25-Aug-25 08:00 03-Apr-26 16:00 ENMAX Outage 32.1TR (SS-32) slip over CT and new power cables installation and P&C works 221.33 Days
Continuous		  
12-Sep-25 08:00 06-Mar-26 16:00 ENMAX Outage 33.1TR (SS-33) tap changer refurbishments. soak test required 175.38 Days
Continuous		  
01-Nov-25 12:00 01-Feb-26 18:00 ALTALINK Outage AML 511s ACF12 (AML 511s Crossings) forced outage 92.29 Days
Continuous		  
25-Nov-25 17:46 30-Jan-26 18:00 ATCO Outage 876s 901T (876s Brintnell) forced outage oil leaking 66.01 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		  
09-Dec-25 17:00 02-Feb-26 11:00 ALTALINK IO 714L (397s Benbow – 1117s South Kaybob), 397s 714 (397s Benbow) complete work on breaker and energize 397s 714 54.75 Days
Continuous		  
04-Jan-26 08:00 31-Mar-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 86.29 Days
Continuous		  
05-Jan-26 08:00 08-Mar-26 16:00 ENMAX Outage 1.80L (SS-1 - SS-28) 1 sub transmission line cut over 62.29 Days
Continuous		  
05-Jan-26 08:00 08-Mar-26 16:00 ENMAX Outage 1.81L (SS-1 - SS-20) 1 sub transmission line cut over 62.29 Days
Continuous		  
05-Jan-26 08:00 30-Jan-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole and cross arm replacement from T&T 25.33 Days
Continuous		  
08-Jan-26 15:00 31-Jan-26 17:00 ALTALINK Outage 42s C2 (42s Sarcee) forced outage 23.08 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 03-Apr-26 17:00 EPCOR TE Protection & Control (Rossdale) protection blocking, relay maintenance 81.38 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		  
12-Jan-26 08:00 30-Jan-26 16:00 ENMAX Outage 32.3TR (SS-32) panel cut-over 18.33 Days
Continuous		  
14-Jan-26 07:00 31-Jan-26 18:00 ALTALINK Outage 799L (235s Entwistle - 443s South Mayerthorpe), 235s 799N (235s Entwistle) 799L rebuild between str 888A-909 (section d) 17.46 Days
Continuous		  
17-Jan-26 11:00 28-Feb-26 17:00 BHE Canada Outage 120s C2 (120s Picture Butte) forced outage 42.25 Days
Continuous		  
19-Jan-26 07:00 02-Feb-26 17:00 EPCOR Outage 711L (113s Inland Cement - 747L tap), 113s T1 (113s Inland Cement), 113s T2 (113s Inland Cement), 113s 711N (113s Inland Cement), 113s 1 (113s Inland Cement), 113s 5 (113s Inland Cement) aerial line repairs and apparatus emergency bushing replacement 14.42 Days
Continuous		  
19-Jan-26 08:00 30-Jan-26 18:00 ENMAX TE Protection & Control (SS-20) autoswitching scheme protection outage for 1.81L cutover protection circuit cutover and commissioning to new 1.81L protection 11.42 Days
Daily		  
19-Jan-26 08:00 30-Jan-26 18:00 ENMAX TE Protection & Control (SS-20) SS-20 BMR-82 protection outage. 1.81L cutover- protection circuit cutover and commissioning to new 1.81L protection 11.42 Days
Daily		  
19-Jan-26 08:00 30-Jan-26 18:00 ENMAX TE Protection & Control (SS-20) 1.81L cutover- protection circuit cutover and commissioning to new 1.81L protection 11.42 Days
Daily		  
19-Jan-26 08:00 30-Jan-26 18:00 ENMAX TE Protection & Control (SS-20) 1.81L cutover- protection circuit cutover and commissioning to new 1.81L protection 11.42 Days
Daily		  
21-Jan-26 08:00 30-Oct-26 16:00 ENMAX Outage 5.7TR (SS-5) 25kV switchgear replacement 282.29 Days
Continuous		  
21-Jan-26 15:53 06-Feb-26 15:53 CMH TE MHS-3 Protection & Control (MHS-3 South Ridge) urgent replace failed protection relay 16 Days
Continuous		  
22-Jan-26 07:30 29-Jan-26 17:30 ALTALINK RB 931L (28s West Brooks - 132s Ware Junction) salvage existing concrete foundations from previously removed structures 931L25 & 1075L25 7.42 Days
Daily		  
24-Jan-26 07:00 03-Feb-26 19:00 ALTALINK RB 922L (17s Benalto - 310p Sundance) raising str 922/926L4, goes with sap: 401748 926L RB required due to proximity 10.5 Days
Daily		  
24-Jan-26 07:00 03-Feb-26 19:00 ALTALINK RB 926L (17s Benalto - 310p Sundance) raising str 922/926L4, goes with sap: 401747 922L RB required due to proximity 10.5 Days
Daily		  
25-Jan-26 07:00 31-Jan-26 18:00 ATCO RB 7L16 (766s Nevis - 948s Heatburg) HOP on 7L16 to facilitate work adjacent to line for CETO project, stringing activities over 7L16 6.46 Days
Continuous		  
25-Jan-26 08:00 30-Jan-26 18:00 ENMAX Outage 20.3TR (SS-20) 20 SUB switchgear replacement 5.42 Days
Continuous		  
26-Jan-26 07:00 30-Jan-26 17:00 ALTALINK, EPCOR Outage 920L (37s North Calder - 557s Castle Downs), 557s CD2403 (557s Castle Downs), 557s CD2401 (557s Castle Downs) 920LW/castledowns: relay maintenance and op checks 4.42 Days
Continuous		  
26-Jan-26 07:00 30-Jan-26 16:30 NWE Outage NWMT Highwood-Judith Gap Auto 230kV Line pole replacement project on the 230 kV line between Highwood AND Spion Kop
4.4 Days
Daily		 AB-MATL
26-Jan-26 07:01 19-Feb-26 17:00 EPCOR Outage T3 (Rossdale), R723 (Rossdale), R724 (Rossdale), RAB3 (Rossdale) Rossdale: TX3 Zone, P&C Commissioning and Initial Energization 24.42 Days
Continuous		  
26-Jan-26 07:15 29-Jan-26 17:45 ALTALINK Outage 314L (207s Pinedale - 228s T.M.P.L. Niton), 207s 314 (207s Pinedale), 228s 314 (228s T.M.P.L. Niton) component replacement str 8–97 3.44 Days
Continuous		  
26-Jan-26 07:30 01-Feb-26 17:30 ALTALINK RB 443L (55s Olds - 214s Innisfail) south crew will be doing structure replacements from 443L63 – 443L137 6.42 Days
Daily		  
26-Jan-26 08:00 31-Jan-26 20:00 SUNCOR TE 29EDD-1 Protection & Control (29EDD-1 Millennium) CIP relay password changes at 29EDD 5.5 Days
Continuous		  
26-Jan-26 08:00 29-Jan-26 16:00 ENMAX, ALTALINK TE 932L (74s Janet - SS-162) firmware upgrade 3.33 Days
Continuous		  
26-Jan-26 08:00 29-Jan-26 16:00 ENMAX, ALTALINK IO 932L (74s Janet - SS-162) firmware upgrade 3.33 Days
Continuous		  
26-Jan-26 08:00 30-Jan-26 16:00 ALTALINK TE 397s Protection & Control (397s Benbow) 397s714 addition requiring settings changes and testing on 4.33 Days
Daily		  
26-Jan-26 08:00 30-Jan-26 17:00 ALTALINK TE 397s RTU/SCADA (397s Benbow) supervisory outages required for alarm/control updates and testing of 397s714 breaker control 4.38 Days
Daily		  
26-Jan-26 09:00 04-Feb-26 15:00 ATCO Outage 9L57 (939s Livock - 960s Birchwood Creek) ground clearance mitigation 9.25 Days
Continuous		  
26-Jan-26 10:00 29-Jan-26 17:00 ALTALINK TE 17s Protection & Control (17s Benalto) upgrade protection relays 3.29 Days
Daily		  
26-Jan-26 10:00 29-Jan-26 17:00 ALTALINK TE 310p Protection & Control (310p Sundance) relay maintenance on 96/25SC/79/452 & 96/25SC/79/4052 no redundancy, relay maintenance on B87/240BC redundancy. 3.29 Days
Daily		  
26-Jan-26 13:00 30-Jan-26 13:00 ATCO TE 789s Protection & Control (789s Keg River) prc relay testing 7L64, 7L62, 7L59 and 701BF, 702BF, 703BF 4 Days
Continuous		  
26-Jan-26 13:00 29-Jan-26 13:00 ATCO TE 2091s Protection & Control (2091s Thornton) prc relay testing 7L20, 7L228, 87/700BS1, 5L703, 5L720 and 5L775 3 Days
Continuous		  
27-Jan-26 10:00 30-Jan-26 16:30 ATCO Outage 7L574 (822s Wolf Lake - 7L574 tap), 822s 702 (822s Wolf Lake) isolate breaker 702 to find leaks and repair if possible, top up insulating gas,
test gas mixture after 24hours		 3.27 Days
Continuous		  
27-Jan-26 14:00 05-Feb-26 14:00 ATCO Outage 740s 703T (740s H.R.Milner), 740s 507C (740s H.R.Milner), 740s 703 (740s H.R. Milner), 740s 503 (740s H.R. Milner) isolate to investigate fault on underground cables or metering tank on T1 feeder at 740S HR Milner 9 Days
Continuous		  
27-Jan-26 17:00 29-Jan-26 19:00 ALTALINK Outage 618s 863X (618s Riverbend), 863L (618s Riverbend - 891L tap) forced outage 2.08 Days
Daily		  
28-Jan-26 06:00 11-Feb-26 18:00 Lethbridge IO Lethbridge PCC activating Backup Control Centre to allow for renovations to the Main Control Centre 14.5 Days
Continuous		  
28-Jan-26 07:30 29-Jan-26 16:00 ENMAX Outage B138-85 (SS-1), B138-86 (SS-1) line cut over 1.35 Days
Continuous		  
28-Jan-26 08:00 29-Jan-26 16:00 ENMAX Outage 35.2TR (SS-35), 35B138-80 (SS-35), 35B138-83 (SS-35), 35MD138-80 (SS-35), 35MD138-90 (SS-35), 35MD138-92 (SS-35) HV switch maintenance 1.33 Days
Continuous		  
29-Jan-26 07:00 29-Jan-26 17:00 EPCOR Outage EP 511s V726 (EP 511s Victoria) switching school recertification 10 Hours
Continuous		  
29-Jan-26 07:30 29-Jan-26 17:00 ATCO TE ATCO Telecom Equipment, 888s RTU/SCADA (888s Dover) CIP vulnerabilities are identified and then patched 9.5 Hours
Continuous		  
29-Jan-26 07:30 29-Jan-26 17:00 ATCO TE ATCO Telecom Equipment, 849s RTU/SCADA (849s Joslyn Creek) CIP vulnerabilities are identified and then patched 9.5 Hours
Continuous		  
29-Jan-26 07:30 29-Jan-26 20:00 ATCO TE ATCO Telecom Equipment, 809s RTU/SCADA (809s Louise Creek) as part of CIP patching vulnerabilities are identified and then patched
 12.5 Hours
Continuous		  
29-Jan-26 07:30 29-Jan-26 20:00 ATCO TE ATCO Telecom Equipment, 825s Whitefish Lake RTU/SCADA CIP patching vulnerabilities are identified and then patched 12.5 Hours
Continuous		  
29-Jan-26 08:00 29-Jan-26 17:00 ALTALINK TE 74s Protection & Control (74s Janet) firmware upgrade on 932L 9 Hours
Daily		  
29-Jan-26 08:00 29-Jan-26 17:00 ALTALINK TE 131s Protection & Control (131s Moon Lake) standard relay maintenance 9 Hours
Daily		  
29-Jan-26 08:00 30-Jan-26 16:00 ENMAX Outage 22.81L (SS-22 - SS-39), 22.2TR (SS-22), 22B138-22BT8 (SS-22), SW85 (SS-22), 22B138-22.81 (SS-22), 22MD138-22.2TR (SS-22), 39B138-22.81 (SS-39) HV SW maintenance, reversing switch check 1.33 Days
Continuous		  
29-Jan-26 08:00 29-Jan-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 67s RTU/SCADA (67s Stirling) split the existing SCADA VLAN 8 Hours
Daily		  
29-Jan-26 08:00 29-Jan-26 17:00 ALTALINK TE 74s RTU/SCADA (74s Janet) techs to resolve pass-through issues involved with RIO D10 9 Hours
Daily		  
29-Jan-26 08:30 29-Jan-26 17:30 ALTALINK TE 89s Protection & Control (89s Ellerslie) DSP card replacements for 1057L 9 Hours
Daily		  
29-Jan-26 09:00 29-Jan-26 11:00 ATCO, CNRL TE ATCO Telecom Equipment, 838s RTU/SCADA (838s Horizon Mining), 838s Protection & Control (838s Horizon Mining), 849s RTU/SCADA (849s Joslyn Creek) CNRL Horizon Expansion_S-Telecom- Horizon sub A SAR and NET 11 SAR os upgrades 2 Hours
Continuous		  
29-Jan-26 09:00 29-Jan-26 16:00 ATCO TE 917s Protection & Control (917s Horse River) PRC-005 relay testing on 51-46/706C, 51-27-59/706C 7 Hours
Continuous		  
29-Jan-26 09:00 30-Jan-26 17:00 ATCO, ALBIAN TE 919s RTU/SCADA (919s Hartley), 920s RTU/SCADA (920s Jackpine) investigate CNRL communication signals, troubleshoot invalid data values, cycle power on 920S and 919S RTU 1.33 Days
Continuous		  
29-Jan-26 10:00 30-Jan-26 17:30 ATCO TE 959s Protection & Control (959s Lanfine), 959s RTU/SCADA (959s Lanfine) 87BA-B 700BS2 Siemens 7UT635 31.5 Hours
Continuous		  
29-Jan-26 10:00 29-Jan-26 11:00 ALTALINK, ATCO Outage 199L (347s AML Fox Creek - 741s ATC Fox Creek), 347s 199W (347s AML Fox Creek), 741s 702 (741s ATC Fox Creek) gas top up on 347s199W 60 Mins
Daily		  
29-Jan-26 11:00 30-Jan-26 18:00 ALTALINK Outage 854L (39s Bickerdike - 854AL tap) urgent structure repair 854L str. 284, 285 31 Hours
Continuous		  
30-Jan-26 07:30 30-Jan-26 20:00 ATCO TE 898s Heart Lake RTU/SCADA, ATCO Telecom Equipment Heart Lake_S-Telecom- CIP patching 12.5 Hours
Continuous		  
30-Jan-26 08:00 30-Jan-26 16:00 ALTALINK TE 254s RTU/SCADA (254s Coaldale), AltaLink Telecom Equipment split the existing SCADA VLAN 8 Hours
Daily		  
30-Jan-26 09:00 30-Jan-26 11:00 ATCO TE 861s RTU/SCADA (861s Eureka River), ATCO Telecom Equipment silver valley and clear hills SAR OS upgrades 2 Hours
Continuous		  
31-Jan-26 07:00 31-Jan-26 17:00 EPCOR TE RTU/SCADA (Namao) substation firewall replacement 10 Hours
Continuous		  
31-Jan-26 07:00 07-Feb-26 17:30 ALTALINK RB 784L (535s Joffre - 784AL tap), 784L (332s Ellis - 784AL tap), 784AL (482s Haynes - 784L tap) stringing (CETO) 962L/986L 7.44 Days
Daily		  
01-Feb-26 07:00 09-Feb-26 18:00 ATCO RB 7L16 (766s Nevis - 948s Heatburg) to facilitate work adjacent to line for CETO project 8.46 Days
Continuous		  
02-Feb-26 07:00 14-Feb-26 18:00 ALTALINK Outage 719L (719AL tap - 719BL tap) component replacement/maintenance structure 219-258 12.46 Days
Continuous		  
02-Feb-26 07:00 06-Feb-26 17:00 ALTALINK, EPCOR Outage 920L (71s Lamoureux - 557s Castle Downs), 557s CD2405 (557s Castle Downs), 557s CD2404 (557s Castle Downs) relay maintenance and op checks on 920LE/Castledowns 4.42 Days
Continuous		  
02-Feb-26 07:00 06-Feb-26 17:00 EPCOR Outage 72CH11 (987s Clover Bar - EP Hardisty), T1 (EP Hardisty), H725 (EP Hardisty), H722 (EP Hardisty), HAB1 (EP Hardisty) relay maintenance on Hardisty TX1 4.42 Days
Continuous		  
02-Feb-26 07:30 06-Feb-26 17:30 ALTALINK RB 443L (55s Olds - 214s Innisfail) South Crew will be doing structure replacements from 443L63 – 443L137 4.42 Days
Daily		  
02-Feb-26 07:30 02-Feb-26 17:30 ALTALINK Outage 202L (61s Lodgepole - 202AL tap) create 202L open point 'A' 10 Hours
Daily		  
02-Feb-26 07:30 02-Feb-26 17:30 ALTALINK RB 202L (61s Lodgepole - 202AL tap), 202L (178s Cynthia - 202AL tap) Safety requirement; Create 202L Open Point 'A' 10 Hours
Daily		  
02-Feb-26 08:00 07-Feb-26 20:00 SUNCOR TE 29EDD-34 Protection & Control (29EDD-34) CIP relay password change 5.5 Days
Continuous		  
02-Feb-26 08:00 09-Feb-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole and cross arm replacement 7.33 Days
Continuous		  
02-Feb-26 08:00 04-Feb-26 16:00 ENMAX Outage 15.60L (SS-15 - SS-21), 21.61L (SS-21 - SS-34), 21.4TR (SS-21), 15B69-15.60 (SS-15), 21B69-15.60 (SS-21), 34B69-21.61 (SS-34), 21B69-21.61 (SS-21), 21B69-21.4TR (SS-21) maintenance on 21SW61, 21SW62, 21SW63, 21SW64, 21SW65, 21SW66, 21SW67 and fix SW64 at 21 sub hot spot 2.33 Days
Continuous		  
02-Feb-26 08:00 05-Feb-26 17:00 ALTALINK TE 17s RTU/SCADA (17s Benalto) firewall upgrade 3.38 Days
Daily		  
02-Feb-26 08:00 03-Feb-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 13s RTU/SCADA (13s Deerland) split the existing SCADA VLAN from 1 to 1 and 2 1.38 Days
Daily		  
02-Feb-26 08:00 03-Feb-26 16:00 ENMAX Outage 6.80L (SS-6 - SS-35), 35B138-82 (SS-35), 35B138-83 (SS-35), 6B138-6.80 (SS-6), 35MD138-6.80 (SS-35), 35MD138-86 (SS-35), 35MD138-87 (SS-35), 35MD138-89 (SS-35), 35MD138-90 (SS-35) HV switch maintenance - 35MD138-6.80, 35MD138-87, 35MD138-89, SW83 1.33 Days
Continuous		  
02-Feb-26 08:00 03-Feb-26 16:00 ENMAX TE Protection & Control (SS-14) 14sub Auto Switching Protection Scheme outage. Relay Protection Test - 14RLY138-14.ASW 1.33 Days
Continuous		  
02-Feb-26 08:00 03-Feb-26 16:00 ENMAX TE Protection & Control (SS-41) 41 sub BMR-81 outage. Relay Protection Test - 41RLY138-41.BMR81 1.33 Days
Continuous		  
02-Feb-26 08:00 02-Feb-26 12:00 ENMAX Outage 3.3TR (SS-3) breaker maintenance. 4 Hours
Continuous		  
02-Feb-26 09:00 03-Feb-26 17:00 ATCO TE ATCO Telecom Equipment Cordel telecom equipment replacement 1.33 Days
Continuous		  
02-Feb-26 09:00 02-Feb-26 10:00 ATCO TE ATCO Telecom Equipment Sheerness_S-Telecom- SHEERNESS A AND NET 11 SAR OS UPGRADES.2 SEPARATE OUTAGES IMPACTING THE FOLLOWING TRAFFIC:
OUTAGE 1 : 9L99 A,THERMAL PROTECTION RAS A, 9L100 A
OUTAGE 2 : 9L99 B,THERMAL PROTECTION RAS B, 9L100 B
60 Mins
Continuous		  
02-Feb-26 09:00 02-Feb-26 16:00 ATCO TE 849s Protection & Control (849s Joslyn Creek) PRC-005 relay testing on 50BF/901& 50BF/902. 7 Hours
Continuous		  
02-Feb-26 09:00 02-Feb-26 18:00 ALTALINK Outage 804L (40s Wetaskiwin - 40s 803L tap), 804L (40s 803L tap - 86s 803L tap), 804L (86s Bigstone - 86s 803L tap), 40s 804W (40s Wetaskiwin), 86s 852 (86s Bigstone), 804L-Pseudo (86s Bigstone) Install grounds at 804L28 for county bridge construction 9 Hours
Daily		  
02-Feb-26 10:00 11-Feb-26 18:00 ATCO RB 7L08 (830s Carmon - 834s Wesley Creek) Maintenance Program, 32 Pole Changes, 21 Crossarm Changes, other structure deficiencies. 9.33 Days
Continuous		  
02-Feb-26 10:00 02-Feb-26 11:00 ALTALINK Outage 397s 138kV Bus 1 (397s Benbow), 720L (347s AML Fox Creek - 397s Benbow), 714L (397s Benbow – 1117s South Kaybob), 397s T1 (397s Benbow), 347s 720X (347s AML Fox Creek) de-energize 397s 138 kV bus B1 to facilitate the first energization of 397s714 60 Mins
Daily		  
02-Feb-26 10:00 05-Feb-26 17:00 ALTALINK TE 320p Protection & Control (320P Keephills) relay maintenance 3.29 Days
Daily		  
02-Feb-26 10:00 06-Feb-26 17:30 ATCO Outage 770s 705C (770s Three Hills) trip coil testing PRC-005 4.31 Days
Continuous		  
02-Feb-26 11:00 02-Feb-26 17:00 ALTALINK TE 395s Protection & Control (395s North Holden) Standard relay maintenance 6 Hours
Daily		  
02-Feb-26 11:00 05-Feb-26 17:00 ALTALINK TE 320p RTU/SCADA (320P Keephills) RTU "A" reboot 3.25 Days
Daily		  
02-Feb-26 11:00 05-Feb-26 17:00 ALTALINK TE 320p RTU/SCADA (320P Keephills) investigate IED trouble alarm. 3.25 Days
Daily		  
02-Feb-26 11:30 03-Feb-26 17:00 ALTALINK TE 293s Protection & Control (293s Bernese) Card replacements 29.5 Hours
Daily		  
02-Feb-26 11:30 06-Feb-26 16:30 ALTALINK Outage 217s C1 (217s North Red Deer) replacement of CT#5’s with RHM dry type, CTs are located between 217s652 and C1 4.21 Days
Continuous		  
02-Feb-26 12:30 02-Feb-26 15:00 ENMAX TE Protection & Control (SS-28) 28PT138-Z31 -X core sec. voltage. 1 sub Transmission line cut over. Demo and reconnect. Fault clearing time 5.5 cycles 2.5 Hours
Continuous		  
02-Feb-26 13:00 06-Feb-26 13:00 ATCO TE 739s Protection & Control (739s Edith Lake) PRC Relay Testing 7L172, 7L43, 702BF, and 700BS1, including AUX tripping relays. One relay at a time. Loss of reclosing and channel teleprotection while line relay is out of service. Redundant A/B protection except for 700BS1. 4 Days
Continuous		  
02-Feb-26 13:00 06-Feb-26 13:00 ATCO TE 789s Protection & Control (789s Keg River) PRC relay testing 4 Days
Continuous		  
02-Feb-26 13:00 02-Feb-26 14:00 ATCO TE ATCO Telecom Equipment, 931s RTU/SCADA (931s Bohn) Telecom upgrading 60 Mins
Continuous		  
02-Feb-26 16:15 18-Feb-26 10:00 ALTALINK Outage 202L (61s Lodgepole - 202AL tap), 61s 202X (61s Lodgepole) replacing air break 202L335 15.74 Days
Continuous		  
03-Feb-26 07:00 17-Feb-26 14:00 ALTALINK Outage 685L (397s Benbow - 1012s Deer Hill), 714L1 (714L tap) 685L OPGW tie into 328s and 397s, replace conductor inside 397s, Line crew to replace structure 685L1 and cut free 714L1, 685L temporary phase swap at 1012s flying tap location 14.29 Days
Continuous		  
03-Feb-26 07:00 03-Feb-26 17:00 EPCOR Outage EP 511s V721 (EP 511s Victoria) Victoria: V721, switching school recertification 10 Hours
Continuous		  
03-Feb-26 08:00 03-Feb-26 16:00 SUNCOR TE 29EDD-2 29PT-3 (29EDD-2 Tar Island) 300495274, 29PT-2 /3/84 AVR settings, implement settings 8 Hours
Continuous		  
03-Feb-26 08:00 04-Feb-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 108s RTU/SCADA (108s Amelia) split the existing SCADA VLAN from 1 to 1 and 2 1.38 Days
Daily		  
03-Feb-26 08:00 04-Feb-26 17:00 ALTALINK TE 275s RTU/SCADA (275s Jenner) settings changes/update to RTU and RSG2100 #3 to enable remote access to TESLA 4000 DDR2 1.38 Days
Daily		  
03-Feb-26 08:00 03-Feb-26 16:00 SUNCOR TE 29EDD-2 RTU/SCADA (29EDD-2 Tar Island) 29EDD2 9PS-5/6 L/R switch DC fail alarms investigate and troubleshoot, DC fail simulate status change from the RTU
 8 Hours
Continuous		  
03-Feb-26 09:00 03-Feb-26 11:00 ATCO, ENEL, ALTALINK TE ATCO Telecom Equipment, 918s RTU/SCADA (918s Bauer), 708s RTU/SCADA (708s Grizzly Bear), 7L65 (709s Vegreville - 7LA65 tap), 7L65 (710s Vermilion - 7LA65 tap), APS# 134 Central East Transfer Out Overload Mitigation Scheme Bauer_S-Telecom/Buffalo Creek_S_Telecom/Grizzly_S-Telecom- 'A' SAR OS upgrade 2 Hours
Continuous		  
03-Feb-26 09:00 03-Feb-26 17:00 ATCO TE ATCO Telecom Equipment, 9L43 (874s McKay River - 888s Dover) removal of DJF and install new Nokia RS232, new SAR A, SDI cards 8 Hours
Continuous		  
03-Feb-26 09:00 03-Feb-26 12:00 ENMAX TE Protection & Control (SS-28) 28PT138-Z31 -Y core sec. voltage, 1 sub transmission line cut over, demo and reconnect 3 Hours
Continuous		  
03-Feb-26 09:00 03-Feb-26 16:00 ATCO TE 849s Protection & Control (849s Joslyn Creek) PRC-005 relay testing on 50BF/903& 50BF/904 7 Hours
Continuous		  
03-Feb-26 09:00 03-Feb-26 17:00 ALTALINK TE 223s Protection & Control (223s Strome) card replacements 8 Hours
Daily		  
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		  
04-Feb-26 07:00 04-Feb-26 17:00 EPCOR Outage EP 511s V722 (EP 511s Victoria) Victoria: V722, switching school recertification 10 Hours
Continuous		  
04-Feb-26 07:00 04-Feb-26 18:30 ALTALINK Outage 922L (17s Benalto - 310p Sundance) Clipping in 922L OHSW between strs 922L1 and 922L7, after raising 922/926L4. See also SAP: 401749 926L RB required due to proximity 11.5 Hours
Daily		  
04-Feb-26 07:00 04-Feb-26 18:30 ALTALINK RB 926L (17s Benalto - 310p Sundance) required for SAP: 401742 922L GOI required due to proximity 11.5 Hours
Daily		  
04-Feb-26 08:00 04-Feb-26 18:00 Syncrude TE Syncrude ICCP Outage SCADA - server update whole Syncrude visibility loss 10 Hours
Daily		  
04-Feb-26 08:00 04-Feb-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 534s RTU/SCADA (534s Eckville) radio maintenance. 534s Eckville supervisory will be lost for 2hrs 9 Hours
Daily		  
04-Feb-26 08:00 04-Feb-26 17:00 ALTALINK TE 12s Protection & Control (12s Heartland) standard relay maintenance, T1 A87/50/51/51N/T1, B240B1 B87/240B1, B500B2 B87/500B2, redundant protections in place at all times 9 Hours
Daily		  
04-Feb-26 08:00 05-Feb-26 17:00 ALTALINK TE 127s RTU/SCADA (127s Bruderheim), AltaLink Telecom Equipment split the existing SCADA VLAN from 1 to 1 and 2. loss of visibility of 127s for 15 minutes in the timeframe indicated. 1.38 Days
Daily		  
04-Feb-26 08:00 05-Feb-26 16:00 ENMAX Outage 47B138-771/1 (SS-47) Investigate the leak and possible repair 1.33 Days
Continuous		  
04-Feb-26 08:00 06-Feb-26 16:00 ENMAX Outage 14.1TR (SS-14) relay protection test 2.33 Days
Continuous		  
04-Feb-26 08:00 05-Feb-26 17:00 SUNCOR TE 635EDD-1000 RTU/SCADA (635EDD-1000), 635EDD-1001 RTU/SCADA (635EDD-1001) update the SCADA configurations at 635EDD-1000 and 635EDD-1001 to add in building temp and battery voltage metering points 1.38 Days
Daily		  
04-Feb-26 08:00 05-Feb-26 16:00 ENMAX TE Protection & Control (SS-41) 41 sub BMR BT3 protection outage. Relay Protection Test - 41RLY138-41BT3 (BMR) 1.33 Days
Continuous		  
04-Feb-26 08:30 04-Feb-26 17:00 ALTALINK TE 221s Protection & Control (221s Sunken Lake) relay card replacements 8.5 Hours
Daily		  
04-Feb-26 09:00 04-Feb-26 10:00 ATCO TE ATCO Telecom Equipment, 804s RTU/SCADA (804s Wintering Hills) Wintering Hills_S_Telecom- Upgrading the NET 2 SAR to V22.
Impact to the following traffic:
#202 RAS A & B
7L85 A&B
804s Winteirng Hills RTU		 60 Mins
Continuous		  
04-Feb-26 09:00 04-Feb-26 16:00 ATCO TE 849s Protection & Control (849s Joslyn Creek) PRC-005 RELAY TESTING on 50BF/905& 50BF/906. Redundant protection in-service at all times. 7 Hours
Continuous		  
04-Feb-26 09:30 04-Feb-26 20:00 SUNCOR IO Suncor RTU/SCADA (Suncor), 29EDD-34 Edd34Sub, 29EDD-1 Millennium, 29EDD-94 Voyageur Rotating BLAN outages lasting 60 minutes or less each affecting security & cameras at the Top T&D Communication Room, SDC Server building / BCC1, SDC ( Control Room), 29EDD-34 P&C building, 29EDD-1X P&C Building, 29EDD-94 P&C Building. Guards will be posted during these outages

 10.5 Hours
Continuous		  
04-Feb-26 13:00 04-Feb-26 14:00 ATCO TE ATCO Telecom Equipment, 933s RTU/SCADA (933s Tower Road) TowerRoad_S-Telecom- Upgrading the NET 2 SAR to V22.
Impact to the following traffic:
7L165 A&B
7L98 A&B
933s Tower Road RTU		 60 Mins
Continuous		  
04-Feb-26 19:00 05-Feb-26 18:30 ALTALINK Outage 926L (17s Benalto - 310p Sundance) Clipping in 926L OHSW between strs 926L1 and 926L7, after raising str 922/926L4 See also SAP: 401745 922L RB required due to proximity 23.5 Hours
Continuous		  
05-Feb-26 07:00 05-Feb-26 17:00 EPCOR Outage EP 511s V723 (EP 511s Victoria) Victoria: V723, Switching School Recertification 10 Hours
Continuous		  
05-Feb-26 07:00 05-Feb-26 19:00 ALTALINK RB 922L (17s Benalto - 310p Sundance) required due to proximity of 926L GOI 12 Hours
Daily		  
05-Feb-26 07:00 08-Feb-26 16:00 ATCO Outage 9L913 (69s North Barrhead - 732s Mitsue) Changing white tag poles from Test & Treat ( Str 16,69 and 503 ) 3.38 Days
Continuous		  
05-Feb-26 07:00 08-Feb-26 16:30 ALTALINK Outage 913L (69s North Barrhead - 732s Mitsue) changing white tag poles from test & treat 3.4 Days
Continuous		  
05-Feb-26 08:00 05-Feb-26 17:00 ALTALINK TE 650s Protection & Control (650s Hansman Lake) protection outages on the following to troubleshoot protection alarm cycling issues: 7L224, A21/L12, B21/79/L12 9 Hours
Daily		  
05-Feb-26 08:00 05-Feb-26 16:00 ENMAX Outage 65B138-D81 (SS-65), 24.82L (SS-24 - SS-65), 65B138-D82 (SS-65) I&R red light very dim (LD) 8 Hours
Continuous		  
05-Feb-26 08:00 06-Feb-26 16:00 ALTALINK TE 140s RTU/SCADA (140s Thompson) split the existing SCADA VLAN from 1 to 1 and 2 1.33 Days
Daily		  
05-Feb-26 09:00 05-Feb-26 12:00 ATCO TE ATCO Telecom Equipment upgrading the A SAR and NET 11 SAR to v21 then v22 3 Hours
Continuous		  
05-Feb-26 09:00 05-Feb-26 11:00 ATCO TE ATCO Telecom Equipment, 837s Mahihkan RTU/SCADA upgrading the A SAR to v21 then v22 2 Hours
Continuous		  
05-Feb-26 09:00 05-Feb-26 16:00 ATCO TE 849s Protection & Control (849s Joslyn Creek) PRC-005 relay testing on 21A/9L08, 21B/9L08. 7 Hours
Continuous		  
05-Feb-26 09:00 05-Feb-26 17:00 ALTALINK TE 454s Protection & Control (454s Buck Lake) card replacement 8 Hours
Daily		  
06-Feb-26 07:00 08-Feb-26 18:30 ALTALINK RB 922L (17s Benalto - 310p Sundance) removing tooling after raising str 922L4 Goes with SAP: 401756 926L RB required due to proximity 2.48 Days
Daily		  
06-Feb-26 07:00 08-Feb-26 18:30 ALTALINK RB 926L (17s Benalto - 310p Sundance) removing tooling after raising str 926L4 Goes with SAP: 401755 922L RB required due to proximity 2.48 Days
Daily		  
06-Feb-26 07:00 27-Feb-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		 21.44 Days
Daily		  
06-Feb-26 09:00 06-Feb-26 16:00 ATCO TE 849s Protection & Control (849s Joslyn Creek) PRC-005 relay testing 7 Hours
Continuous		  

Prepared On:   2026-01-28   14:37:30

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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