Alberta Electric System Operator
System Co-ordination Plan
2025-12-16 to 2026-01-09
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		  
11-Mar-25 00:00 31-Mar-26 16:00 ALTALINK Outage 377s 473C (377s AML Hardisty) forced outage 385.67 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 19-Dec-25 17:00 EPCOR TE Protection & Control (Woodcroft) Woodcroft: protection blocking for merging unit and protection upgrade. 263.46 Days
Continuous		  
14-May-25 08:00 10-Feb-26 16:00 ENMAX TE Protection & Control (SS-32) 32sub 138kV autoswitching protection outage 272.38 Days
Continuous		  
13-Jun-25 17:00 11-Feb-26 17:00 EPCOR Outage T3 (Rossdale) Rossdale - TX3 LCR 243.04 Days
Continuous		  
21-Jul-25 09:00 19-Jan-26 17:00 ATCO TE 732s Protection & Control (732s Mitsue) the breaker fail protection will be disabled during the project, as we migrate from the existing to the new protection 182.38 Days
Continuous		  
21-Jul-25 09:00 23-Jan-26 16:30 ATCO TE 732s RTU/SCADA (732s Mitsue) existing RTU system being replaced with new SMP system 186.35 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 20-Feb-26 17:00 EPCOR Outage T2 (EP Riverview) bushing test failure (found during OE110184) 210.04 Days
Continuous		  
20-Aug-25 17:00 17-Dec-25 17:00 ALTALINK Outage 1075L (28s West Brooks - 132s Ware Junction) restoration from real time storm 119.04 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		  
02-Sep-25 08:00 28-Feb-26 16:00 ENMAX Outage 38.1C (SS-38) capacitor bank switcher replacement 179.38 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		  
03-Nov-25 07:00 19-Dec-25 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) protection blocking for P&C maintenance at Cloverbar 46.42 Days
Continuous		  
12-Nov-25 08:00 16-Jan-26 16:00 ENMAX Outage 20.1TR (SS-20), 20BA8-20.1TR (SS-20), 20BB8-20.1TR (SS-20) maintenance 65.33 Days
Continuous		  
21-Nov-25 08:00 09-Jan-26 16:00 ENMAX Outage 38.3TR (SS-38) 38.3TR secondary cable replacement 49.33 Days
Continuous		  
25-Nov-25 17:46 25-Jan-26 18:00 ATCO Outage 876s 901T (876s Brintnell) forced outage oil leaking 61.01 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		  
01-Dec-25 07:00 18-Dec-25 18:00 ENMAX TE Protection & Control (SS-39) 39s auto-switching scheme protection outage, SS-39 HV SW replacement 17.46 Days
Daily		  
01-Dec-25 08:00 18-Dec-25 16:00 ENMAX Outage 31.84L (SS-31 - SS-32), 31B138-31.84 (SS-31), 32B138-31.84 (SS-32) 31.84L P&C cut over 17.33 Days
Continuous		  
01-Dec-25 08:00 19-Dec-25 12:30 ENMAX Outage 39.82L (SS-39 - SS-162), 22.81L (SS-22 - SS-39), 39.2TR (SS-39), 39.4TR (SS-39), 22B138-22.81 (SS-22), 39B138-22.81 (SS-39), 39B138-39.82 (SS-39), SW83 (SS-39), 39MD138-39.2TR (SS-39), 39MD138-39.4TR (SS-39) HV switch replacement 18.19 Days
Continuous		  
01-Dec-25 09:00 16-Dec-25 17:00 BCH Outage 1L274 (48s Pocaterra - 978s BCH Britt Creek) for LLP work 15.33 Days
Daily		 AB-BC
01-Dec-25 09:00 16-Dec-25 17:00 ALTALINK IO 887L (48s Pocaterra - 978s BCH Britt Creek) hazard tree removal along various sections of circuit near Elk Lakes provincial park 15.33 Days
Daily		  
04-Dec-25 07:00 19-Dec-25 18:00 ALTALINK RB 1053L (132s Ware Junction - 324s Cassils) due to proximity to 931L 15.46 Days
Daily		  
04-Dec-25 11:00 19-Dec-25 18:00 ALTALINK Outage 931L (28s West Brooks - 132s Ware Junction) install new structures as part of the 1075L storm restoration. 15.29 Days
Continuous		  
08-Dec-25 07:00 23-Dec-25 17:00 EPCOR Outage 557s T1 (557s Castle Downs) surge arrestor LCR 15.42 Days
Continuous		  
09-Dec-25 09:00 19-Dec-25 17:00 BCH Outage 5L52 (BPA Custer - BCH Ingledow) make emergent glass replacement on the circuit 10.33 Days
Continuous		 AB-BC
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		  
11-Dec-25 00:00 17-Dec-25 18:00 ATCO Outage 6L73 (729s Otauwau - 745s Slave Lake) forced outage 6.75 Days
Continuous		  
12-Dec-25 01:30 17-Dec-25 18:00 ALTALINK Outage 310p T30 (310p Sundance) forced outage 5.69 Days
Continuous		  
13-Dec-25 08:00 16-Dec-25 16:00 SUNCOR Outage 29EDD-34 260kV Bus 29PP-45 (29EDD-34), 29PL9-13 (29EDD-34 - 29EDD-65), 29EDD-34 29-952-112 (29EDD-34), 29EDD-34 29-952-113 (29EDD-34), 29EDD-34 29-952-123 (29EDD-34), 29EDD-34 29-952-133 (29EDD-34), 29EDD-34 29-952-143 (29EDD-34), 29EDD-65 29PS-0266 (29EDD-65 Edd65Sub) inspection to bring 29PL9-13 back online and keep 29PP-45 offline for repairs 3.33 Days
Continuous		  
14-Dec-25 03:00 21-Dec-25 17:00 ALTALINK Outage AML 511s SVC Plus (AML 511s Crossings) forced 7.58 Days
Continuous		  
14-Dec-25 07:30 20-Dec-25 17:30 ALTALINK RB 793L (87s Gaetz - 535s Joffre) setting structures on 986L/962L str’s 25-55, working near str’s 31-65 on 793L 6.42 Days
Daily		  
15-Dec-25 07:00 18-Dec-25 17:00 EPCOR Outage 72 kV Bus 2 (Rossdale), 72RW3 (Rossdale - Woodcroft), 72RV4 (EP 511s Victoria - Rossdale), 72RG7 (Garneau - Rossdale), RW727 (Rossdale), VHBB1 (Rossdale), VHBB2 (Rossdale), RG725 (Rossdale), RV726 (Rossdale), EP 511s VDS15 (EP 511s Victoria), GDS4 (Garneau), G725 (Garneau), G722 (Garneau), M723 (Meadowlark) bus surge arrestor replacement 3.42 Days
Continuous		  
15-Dec-25 07:00 21-Dec-25 19:00 ATCO RB 7L143 (766s Nevis - 769s Stettler) facilitate work adjacent to line for CETO project 6.5 Days
Continuous		  
15-Dec-25 07:00 19-Dec-25 17:00 ALTALINK, EPCOR TE 1139L (367s Harry Smith - EP Riverview) protection blocking, relay maintenance 4.42 Days
Continuous		  
15-Dec-25 07:00 19-Dec-25 17:00 EPCOR TE 72NW15 (Namao - Woodcroft) protection blocking for 72NW15 line, CVT cutover 4.42 Days
Continuous		  
15-Dec-25 07:00 19-Dec-25 17:00 EPCOR TE 72KN23 (Kennedale - Namao) protection blocking for 72KN23 line, CVT cutover 4.42 Days
Continuous		  
15-Dec-25 07:00 19-Dec-25 17:00 EPCOR TE 72VN21 (EP 511s Victoria - Namao) protection blocking for 72VN21 line, CVT cutover 4.42 Days
Continuous		  
15-Dec-25 08:00 16-Dec-25 17:00 ALTALINK TE 67s RTU/SCADA (67s Stirling) implement supervisory controls and indication to RAS-43 1.38 Days
Daily		  
15-Dec-25 08:00 16-Dec-25 17:00 ALTALINK TE 67s Protection & Control (67s Stirling) implement supervisory controls and indication to RAS 43 and investigate or configure remote access issues 1.38 Days
Daily		  
15-Dec-25 08:00 19-Dec-25 17:00 ALTALINK TE 267s RTU/SCADA (267s Killarney Lake) RTU database update 4.38 Days
Daily		  
15-Dec-25 08:00 19-Dec-25 17:00 ATCO RB 7L86 (822s Wolf Lake - 1200s Foster Creek) structure changes for line to ground clearance mitigation, live line work 4.38 Days
Continuous		  
15-Dec-25 09:00 19-Dec-25 16:00 ATCO RB 7L171 (802s Michichi Creek - 804s Wintering Hills) installing marker cones at critical crossing span 7L171-622 to 7L171-623 4.29 Days
Continuous		  
15-Dec-25 09:00 16-Dec-25 18:00 ALTALINK Outage 744L (235s Entwistle - 744AL tap), 235s 744W (235s Entwistle) install dampers at structures 97A, 96A, 94A, 7 1.38 Days
Continuous		  
15-Dec-25 09:00 16-Dec-25 18:00 Saskpower Outage SASK POWER P2C maintenance 1.38 Days
Continuous		 AB-SK
15-Dec-25 10:00 16-Dec-25 17:30 ATCO Outage 959s SVC (959s Lanfine), 959s 921 (959s Lanfine) troubleshoot cause of recent SVC tripping event 31.5 Hours
Continuous		  
15-Dec-25 10:00 19-Dec-25 16:00 ATCO TE 716s RTU/SCADA (716s Lloydminster) transfer station DC to temporary battery bank, replace battery bank, install battery monitoring system, update station controller configuration for BMS connection, test new alarms 4.25 Days
Continuous		  
15-Dec-25 10:00 16-Dec-25 17:00 ALTALINK TE 108s RTU/SCADA (108s Amelia) RTU database update 31 Hours
Daily		  
15-Dec-25 10:00 18-Dec-25 17:30 ATCO TE 749s Flyingshot Lake Protection & Control PPRC-005 auxiliary trip relay testing 3.31 Days
Continuous		  
15-Dec-25 10:00 16-Dec-25 17:00 ATCO TE ATCO Telecom Equipment, 784s RTU/SCADA (784s Donnelly) cutover of the site to new switch will take place Dec 16 31 Hours
Continuous		  
15-Dec-25 11:00 19-Dec-25 17:30 ALTALINK TE 272s RTU/SCADA (272s Springbank) implement supervisory controls and indication for sectionalizer 4.27 Days
Daily		  
15-Dec-25 11:30 16-Dec-25 17:00 ALTALINK TE 140s Protection & Control (140s Thompson) replace DSP cards and maintenance 29.5 Hours
Continuous		  
15-Dec-25 12:00 16-Dec-25 16:00 ATCO TE 2005s Protection & Control (2005s Secord) complete relay testing 28 Hours
Continuous		  
15-Dec-25 13:00 16-Dec-25 17:00 ALTALINK TE 17s Protection & Control (17s Benalto) card replacement affecting 240B2 - B87 relays 28 Hours
Continuous		  
15-Dec-25 15:00 31-Jan-26 23:00 ALTALINK Outage 58s C1 (58s Edson) forced outage 47.33 Days
Continuous		  
16-Dec-25 08:00 16-Dec-25 16:00 ALTALINK Outage 225L (67s Stirling - 225AL tap), 67s 225 (67s Stirling) breaker 352 (225s) alarm splitting 8 Hours
Daily		  
16-Dec-25 08:00 16-Dec-25 17:00 ALTALINK TE 358s RTU/SCADA (358s Amoco Brazeau) investigate IED trouble on L3 MET 9 Hours
Daily		  
16-Dec-25 08:00 16-Dec-25 17:00 ALTALINK TE 358s Protection & Control (358s Amoco Brazeau) protection outage on U/F relay 2-1/81 to investigate VR1 voltage imbalance 9 Hours
Daily		  
16-Dec-25 08:00 16-Dec-25 12:00 ENMAX Outage 33.83L (SS-33 - SS-41), 41B138-33.83 (SS-41), 33B138-33.83 (SS-33) breaker trip circuit test - 41B138-33.83 4 Hours
Continuous		  
16-Dec-25 08:00 16-Dec-25 12:00 ENMAX TE Protection & Control (SS-24) 24 sub auto-switching protection scheme outage, I&R 24 Sub GE C30 internal battery fail 4 Hours
Continuous		  
16-Dec-25 08:00 18-Dec-25 18:00 ALTALINK TE 520s RTU/SCADA (520s Bennett) update RTU to add supervisory control and indication for RAS-11 2.42 Days
Daily		  
16-Dec-25 08:00 16-Dec-25 12:00 ENMAX Outage 14.2TR (SS-14) LV breaker maintenance 4 Hours
Continuous		  
16-Dec-25 08:00 18-Dec-25 16:00 ALTALINK TE 520s Protection & Control (520s Bennett) add E/D control to RAS 11 and RAS 12 2.33 Days
Daily		  
16-Dec-25 08:30 16-Dec-25 12:30 ATCO TE ATCO Telecom Equipment, 845s Protection & Control (845s Big Mountain), 749s Flyingshot Lake Protection & Control replace RF cables on the IRU and troubleshoot alarms 4 Hours
Continuous		  
16-Dec-25 09:00 16-Dec-25 12:00 ENMAX Outage 1.82L (SS-1 - SS-5) transfer from JMUX to JPAX circuits 3 Hours
Continuous		  
16-Dec-25 09:00 16-Dec-25 17:00 ALTALINK TE 108s Protection & Control (108s Amelia) card replacement 8 Hours
Daily		  
16-Dec-25 09:00 19-Dec-25 20:00 SUNCOR IO 29EDD-1 Protection & Control (29EDD-1 Millennium), 29EDD-94 Protection & Control (29EDD-94 Voyageur), 29EDD-34 Protection & Control (29EDD-34) DFR firmware upgrade 3.46 Days
Continuous		  
16-Dec-25 10:00 16-Dec-25 17:30 ATCO TE 809s Protection & Control (809s Louise Creek), 809s RTU/SCADA (809s Louise Creek) configuration update 7.5 Hours
Continuous		  
16-Dec-25 11:00 18-Dec-25 13:30 ALTALINK Outage 267s T1 (267s Killarney Lake), 267s 3 (267s Killarney Lake), 267s 2054X (267s Killarney Lake), 267s 2120W (267s Killarney Lake), 267s 14 (267s Killarney Lake) install wildlife cover on 267s3 and VT3 2.1 Days
Continuous		  
16-Dec-25 12:01 16-Dec-25 16:00 ENMAX Outage 1.84L (SS-1 - SS-5) transfer from JMUX to JPAX circuits 3.98 Hours
Continuous		  
16-Dec-25 12:01 16-Dec-25 16:00 ENMAX Outage 54.81L (SS-54 - SS-65), 54B138-54.81 (SS-54) breaker trip circuit test 3.98 Hours
Continuous		  
16-Dec-25 16:01 19-Dec-25 16:00 SUNCOR Outage 29EDD-34 260kV Bus 29PP-45 (29EDD-34), 29EDD-34 29-952-113 (29EDD-34), 29EDD-34 29-952-123 (29EDD-34), 29EDD-34 29-952-133 (29EDD-34), 29EDD-34 29-952-143 (29EDD-34) repairs at 29EDD34 on 29PP-45 bus after bringing 29PL9-13 back online 3 Days
Continuous		  
17-Dec-25 07:00 17-Dec-25 17:00 ALTALINK, DOW TE 166s Protection & Control (166s Dow Chemical Fort Saskatchewan) card replacement 10 Hours
Daily		  
17-Dec-25 07:00 18-Dec-25 17:30 ALTALINK RB 759L (87s Gaetz - 276s Prentiss) install bird diverters on span 28-29 1.44 Days
Daily		  
17-Dec-25 08:00 17-Dec-25 17:00 ALTALINK TE 272s Protection & Control (272s Springbank) ACC visibility project wire and commission 272s 3L auto sectionalizer indication, alarms and remote controls 9 Hours
Daily		  
17-Dec-25 08:00 17-Dec-25 17:00 ALTALINK TE 63s Protection & Control (63s Red Deer) card replacement 9 Hours
Daily		  
17-Dec-25 08:00 17-Dec-25 11:00 ENMAX Outage 2B138-D91 (SS-2) breaker trip coil test - 2B138-D91 3 Hours
Continuous		  
17-Dec-25 08:00 17-Dec-25 17:30 ATCO TE 2075s Protection & Control (2075s Newell) download settings files and event reports from all POW relays 9.5 Hours
Continuous		  
17-Dec-25 08:00 17-Dec-25 20:00 SUNCOR TE Suncor RTU/SCADA (Suncor) replace main network routers for MCC and BCC 12 Hours
Continuous		  
17-Dec-25 08:30 18-Dec-25 17:00 ALTALINK TE 993s Protection & Control (993s Abee) replace DSP cards and maintenance 1.35 Days
Daily		  
17-Dec-25 08:30 18-Dec-25 17:00 ALTALINK TE 385s RTU/SCADA (385s Spring Coulee) configuration update to RTU, replace failing voltage resistor in station service AC cabinet 1.35 Days
Daily		  
17-Dec-25 08:30 17-Dec-25 12:00 ENMAX TE RTU/SCADA (SS-9) transfer of SCADA from JMUX to JPAX at substations in ring 2 3.5 Hours
Continuous		  
17-Dec-25 09:00 17-Dec-25 17:00 ATCO TE ATCO Telecom Equipment, 2029s RTU/SCADA (2029s Heathfield) Heathfield_S-Telecom- MED BES firewall install - outage to local network and SCADA communications 8 Hours
Continuous		  
17-Dec-25 09:00 17-Dec-25 16:00 ALTALINK Outage 744L (228s T.M.P.L. Niton - 744AL tap), 228s 744 (228s T.M.P.L. Niton) replace the gear box on 744L89B 7 Hours
Daily		  
17-Dec-25 09:30 18-Dec-25 16:00 ATCO TE 848s Protection & Control (848s Ruth Lake) complete relay testing 30.5 Hours
Continuous		  
17-Dec-25 09:30 18-Dec-25 17:30 ATCO Outage 813s SVC (813s Little Smoky), 813s 719 (813s Little Smoky) replace failed valve cooling pump 1.33 Days
Continuous		  
17-Dec-25 10:00 17-Dec-25 14:00 ALTALINK, TRANSALTA Outage 250p T1 (250p Bighorn Plant) maintenance 4 Hours
Daily		  
17-Dec-25 10:00 17-Dec-25 17:00 ALTALINK TE 89s RTU/SCADA (89s Ellerslie) firmware update 7 Hours
Daily		  
17-Dec-25 11:01 17-Dec-25 13:00 ENMAX Outage 2B138-D93 (SS-2) breaker trip coil test - 2B138-D93 119 Mins
Continuous		  
17-Dec-25 13:01 17-Dec-25 16:00 ENMAX Outage 2B138-D94 (SS-2) breaker trip coil test - 2B138-D94 2.98 Hours
Continuous		  
17-Dec-25 21:00 17-Dec-25 22:00 BCH IO 1L274 (BCH Elkford - BCH Elkford tap) PON submitted (PON #48393) to connect MO6, open EFT
1D23
 60 Mins
Continuous		  
17-Dec-25 21:00 17-Dec-25 22:00 BCH Outage 1L274 (BCH Elkford - BCH Elkford tap) PON submitted (PON #48393) to connect MO6, open EFT
1D23
 60 Mins
Continuous		 AB-BC
18-Dec-25 04:00 18-Dec-25 05:00 BCH IO 1L274 (BCH Elkford - BCH Elkford tap)
PON submitted (PON #48393) to connect MO6, open EFT
1D23		 60 Mins
Continuous		  
18-Dec-25 04:00 18-Dec-25 05:00 BCH Outage 1L274 (BCH Elkford - BCH Elkford tap) PON submitted (PON #48393) to connect MO6
 60 Mins
Continuous		 AB-BC
18-Dec-25 07:00 18-Dec-25 17:00 ALTALINK TE 120s RTU/SCADA (120s Picture Butte) RTU outage 10 Hours
Continuous		  
18-Dec-25 08:00 18-Dec-25 17:00 ALTALINK TE 484s RTU/SCADA (484s Millar Western) update configuration 9 Hours
Daily		  
18-Dec-25 08:00 18-Dec-25 13:00 ALTALINK TE 332s Protection & Control (332s Ellis) card replacements 5 Hours
Daily		  
18-Dec-25 08:00 18-Dec-25 11:00 ENMAX Outage 2B138-D95 (SS-2) breaker trip coil test - 2B138-D95 3 Hours
Continuous		  
18-Dec-25 08:00 18-Dec-25 17:00 ALTALINK TE 74s RTU/SCADA (74s Janet) techs need to trouble shoot the issue and possibly replace RIO-D10 9 Hours
Daily		  
18-Dec-25 10:00 18-Dec-25 14:00 ALTALINK, TRANSALTA Outage 250p T2 (250p Bighorn Plant) maintenance 4 Hours
Daily		  
18-Dec-25 11:00 18-Dec-25 16:00 ENMAX Outage 2B138-D96 (SS-2) breaker trip coil test - 2B138-D96 5 Hours
Continuous		  
18-Dec-25 11:00 22-Dec-25 13:00 ALTALINK Outage 199L (347s AML Fox Creek - 741s ATC Fox Creek), 347s 199W (347s AML Fox Creek) gas top up on 347s199W 4.08 Days
Daily		  
19-Dec-25 08:00 21-Dec-25 16:00 ATCO RB 7L45 (798s Bridge Creek - 813s Little Smoky) high load move 7L45 str 158 2.33 Days
Continuous		  
19-Dec-25 08:00 21-Dec-25 16:00 ATCO RB 7L46 (813s Little Smoky - 845s Big Mountain) high load move 7L46 str 158 2.33 Days
Continuous		  
19-Dec-25 08:00 20-Dec-25 16:00 ENMAX Outage 2.82L (SS-2 - SS-5), 5B138-2.82 (SS-5) investigate sagging cables in MH2299, xray and jacket test 1.33 Days
Continuous		  
22-Dec-25 08:00 22-Dec-25 12:00 ENMAX Outage 7.84L (SS-7 - SS-36), 36B138-7.84 (SS-36), 7B138-7.84 (SS-7) low SF6 gas in breaker, need to top up 4 Hours
Continuous		  
22-Dec-25 09:00 24-Dec-25 17:00 ALTALINK IO 1201L (520s Bennett - BCH Cranbrook) CBK 2L294, 5L94, 5L92, AutoVAR PLC, Overvoltage PLC OOS OAT for maintenance 2.33 Days
Daily		  
22-Dec-25 09:00 24-Dec-25 17:00 BCH TE 5L94 (BCH Cranbrook - 102s Langdon), 2L294 (BCH A. A. Lambert - BCH Cranbrook), 5L92 (BCH Cranbrook - BCH Selkirk) CBK 2L294, 5L94, 5L92, AutoVAR PLC, overvoltage PLC OOS OAT for NERC RAS PM 2.33 Days
Daily		  
29-Dec-25 09:00 31-Dec-25 17:00 ALTALINK IO 1201L (520s Bennett - BCH Cranbrook) CBK 2L294, 5L94, 5L92, AutoVAR PLC, Overvoltage PLC OOS OAT for maintenance 2.33 Days
Daily		  
29-Dec-25 09:00 31-Dec-25 17:00 BCH TE 5L94 (BCH Cranbrook - 102s Langdon), 5L92 (BCH Cranbrook - BCH Selkirk), 2L294 (BCH A. A. Lambert - BCH Cranbrook) maintenance 2.33 Days
Daily		  
05-Jan-26 07:00 08-Jan-26 17:00 ATCO TE 710s Protection & Control (710s Vermilion) change and test relay settings 3.42 Days
Continuous		  
05-Jan-26 08:00 08-Mar-26 16:00 ENMAX Outage 1.80L (SS-1 - SS-28), 28B138-1.80 (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), 20B138-1.81 (SS-20) 1 sub transmission line cut over 62.29 Days
Continuous		  
05-Jan-26 08:00 08-Jan-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole and cross arm replacement from T&T 3.33 Days
Continuous		  
05-Jan-26 08:00 06-Jan-26 16:00 ALTALINK TE AML 793s RTU/SCADA (AML 793s Horse Creek) split the existing SCADA VLAN from 1 to 1 and 2 1.33 Days
Daily		  
05-Jan-26 08:00 09-Jan-26 17:00 ALTALINK TE 356s Protection & Control (356s Milo) DLR project - protection outages required to make metering configuration changes 4.38 Days
Daily		  
05-Jan-26 08:00 09-Jan-26 17:00 ALTALINK TE 356s RTU/SCADA (356s Milo) DLR project - update RTU for RAS175 protection changes 4.38 Days
Daily		  
05-Jan-26 10:00 12-Jan-26 12:00 ATCO Outage 9L40 (732s Mitsue - 809s Louise Creek) replace 4 damaged poles 7.08 Days
Continuous		  
05-Jan-26 11:00 09-Jan-26 17:30 ATCO TE 735s Protection & Control (735s Swan River) relay testing on 50BF/601, 87TA/601T, 87B/600BS3, 21B/6L97, 21B/6L96, 50BF/602, 50BF/604, 50BF/603 4.27 Days
Continuous		  
05-Jan-26 12:30 05-Jan-26 15:00 ENMAX TE Protection & Control (SS-20) 1 sub transmission line cut over, relocate and reconnect 2.5 Hours
Continuous		  
06-Jan-26 07:15 11-Jan-26 18:30 ALTALINK Outage 890L (58s Edson - 207s Pinedale), 207s 890 (207s Pinedale), 58s 890 (58s Edson) replace structures 5.47 Days
Continuous		  
06-Jan-26 08:00 09-Jan-26 17:00 ATCO Outage 732s 902T (732s Mitsue), 732s 503R (732s Mitsue) protection upgrade 3.38 Days
Continuous		  
06-Jan-26 08:00 08-Jan-26 17:00 ALTALINK TE 38s Protection & Control (38s East Edmonton) standard relay maintenance 2.38 Days
Daily		  
06-Jan-26 08:00 08-Jan-26 17:00 ALTALINK TE 89s Protection & Control (89s Ellerslie) standard relay maintenance 2.38 Days
Daily		  
06-Jan-26 08:00 06-Jan-26 17:00 ALTALINK TE 316s Protection & Control (316s West Crossfield) standard relay maintenance 9 Hours
Daily		  
06-Jan-26 08:00 07-Jan-26 16:00 ALTALINK TE 5s RTU/SCADA (5s East Calgary) split the existing SCADA VLAN from 1 to 1 and 2 1.33 Days
Daily		  
06-Jan-26 08:00 06-Jan-26 17:00 ALTALINK TE 99s RTU/SCADA (99s North St. Albert), AltaLink Telecom Equipment replace firewall, split VLAN 9 Hours
Daily		  
06-Jan-26 08:30 07-Jan-26 17:00 ALTALINK TE 378s Protection & Control (378s Shell Caroline) removing 138 kV relays for maintenance 1.35 Days
Daily		  
06-Jan-26 08:30 08-Jan-26 17:00 ALTALINK TE 15s Protection & Control (15s Fort Macleod) relay maintenance 2.35 Days
Daily		  
06-Jan-26 09:00 06-Jan-26 11:00 ATCO TE ATCO Telecom Equipment, 801s RTU/SCADA (801s Anderson), 807s RTU/SCADA (807s Sheerness) upgrading SAR 2 Hours
Continuous		  
06-Jan-26 09:00 06-Jan-26 12:00 ENMAX TE Protection & Control (SS-20) 1 sub transmission line cut over, relocate and reconnect 3 Hours
Continuous		  
07-Jan-26 07:00 13-Jan-26 17:30 ALTALINK RB 799L (235s Entwistle - 443s South Mayerthorpe), 799L (77s Sagitawah - 443s South Mayerthorpe) proximity for 799L rebuild str 888A–909 (section D) 6.44 Days
Daily		  
07-Jan-26 07:30 07-Jan-26 15:00 ALTALINK TE 17s Protection & Control (17s Benalto) commission fail alarms from new 297s3302L, possible setting changes required 7.5 Hours
Daily		  
07-Jan-26 08:00 07-Jan-26 17:00 ATCO Outage 7L92 (709s Vegreville - 7LA92 tap), 709s 705 (709s Vegreville) replace structure 7L92-37 9 Hours
Continuous		  
07-Jan-26 08:00 07-Jan-26 18:00 Syncrude TE Syncrude ICCP Outage server update
 10 Hours
Daily		  
07-Jan-26 08:00 20-Jan-26 18:00 ALTALINK Outage 931L (28s West Brooks - 132s Ware Junction) install steel self-supporting structure as part of the 1075L storm restoration 13.42 Days
Continuous		  
07-Jan-26 08:00 08-Jan-26 16:00 ENMAX, ALTALINK Outage 35.81L (42s Sarcee - SS-35), 35B138-81 (SS-35), 42s 35 (42s Sarcee), 35MD138-81 (SS-35), 35MD138-83 (SS-35), 35MD138-35.81 (SS-35) maintenance - 35MD138-35.81, 35MD138-83, 35MD138-81, SW81 1.33 Days
Continuous		  
07-Jan-26 08:00 08-Jan-26 16:00 ALTALINK TE 65s RTU/SCADA (65s High River) split the existing SCADA VLAN from 1 to 1 and 2 1.33 Days
Daily		  
07-Jan-26 08:00 08-Jan-26 16:00 ALTALINK IO 42s 35 (42s Sarcee) maintenance - 35MD138-35.81, 35MD138-83, 35MD138-81, SW81 1.33 Days
Daily		  
07-Jan-26 08:00 07-Jan-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 305s RTU/SCADA (305s Acheson) update MPLS nodes, split VLAN and update configuration 9 Hours
Daily		  
07-Jan-26 09:00 07-Jan-26 11:00 ATCO TE ATCO Telecom Equipment, 9L59 (801s Anderson - 9LA59 tap) upgrading the Anderson NET 11 sar from v9 to v21, then v22 2 Hours
Continuous		  
07-Jan-26 09:00 07-Jan-26 11:00 ATCO Outage 9L59 (801s Anderson - 9LA59 tap) open 9L59 at 801S during telecom outage 1-00506750 2 Hours
Continuous		  
08-Jan-26 08:00 08-Jan-26 17:00 ALTALINK TE 504s RTU/SCADA (504s Queenstown) RTU outrage to replace Ronan annunciator 9 Hours
Daily		  
08-Jan-26 08:00 19-Jan-26 16:00 Syncrude Outage 815 (Syncrude Mildred Lake), 816 (Syncrude Mildred Lake) repair 72 kV pothead in plant 31 switchyard 11.33 Days
Continuous		  
08-Jan-26 08:00 08-Jan-26 17:00 ALTALINK TE 42s Protection & Control (42s Sarcee) PRC maintenance on T1 S59-T1/TERT, C3 B50/51N/27/59/60/60N/C3 , C2 B50/51N/27/59/60/60N/C2 9 Hours
Daily		  
08-Jan-26 08:00 09-Jan-26 16:00 ALTALINK TE 245s RTU/SCADA (245s Seebe) split the existing SCADA VLAN from 1 to 1 and 2 1.33 Days
Daily		  
08-Jan-26 08:00 08-Jan-26 16:00 ENMAX Outage 5.1TR (SS-5) relay protection test, lockouts, tap changer reversing switch check 8 Hours
Continuous		  
08-Jan-26 08:00 08-Jan-26 16:00 ALTALINK TE 434s RTU/SCADA (434s Stony Plain) split VLAN, replace firewall 8 Hours
Daily		  
08-Jan-26 08:30 08-Jan-26 12:00 ALTALINK TE 412s Protection & Control (412s Shell Eagle Creek) remove under frequency relays for maintenance 3.5 Hours
Daily		  
08-Jan-26 09:00 08-Jan-26 11:00 ATCO TE ATCO Telecom Equipment, 930s RTU/SCADA (930s Arcenciel) upgrading SAR OS TO V21 2 Hours
Continuous		  
08-Jan-26 09:00 09-Jan-26 17:00 ATCO TE ATCO Telecom Equipment, 718s Protection & Control (718s Parsons Creek) telecom upgrade 1.33 Days
Continuous		  
08-Jan-26 09:00 08-Jan-26 09:30 ALTALINK Outage 719L (263s Strachan - 719AL tap), 719L (719AL tap - 719BL tap), 764L (304s Shell Limestone - 581s Amoco Ricinus), 719AL (581s Amoco Ricinus - 719L tap), 304s T1 (304s Shell Limestone), 304s T2 (304s Shell Limestone), 581s T1 (581s Amoco Ricinus) switching to open 719L259C 30 Mins
Continuous		  
08-Jan-26 09:00 08-Jan-26 11:00 ATCO Outage 7L93 (828s Sulphur Point - 930s Arcenciel) 7L93 needs to be open ended during telecom outage 2 Hours
Continuous		  
08-Jan-26 09:30 25-Jan-26 18:00 ALTALINK Outage 719L (263s Strachan - 719AL tap), 263s 719 (263s Strachan) component replacement/maintenance str 260-287 17.35 Days
Continuous		  
08-Jan-26 10:00 08-Jan-26 15:00 ATCO Outage 7L53 (700s Bonnyville - 7LA53 tap), 700s 702 (700s Bonnyville) complete work on 7L53-620 5 Hours
Continuous		  
08-Jan-26 12:30 08-Jan-26 17:00 ALTALINK TE 531s Protection & Control (531s Shell Schrader Creek) remove under frequency relays for maintenance 4.5 Hours
Daily		  
09-Jan-26 08:00 09-Jan-26 16:00 ENMAX Outage 5.6TR (SS-5) relay protection test lockouts, tap changer reversing switch check 8 Hours
Continuous		  

Prepared On:   2025-12-15   20:58:18

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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