Alberta Electric System Operator
System Co-ordination Plan
2025-07-11 to 2025-07-18
Approved Outages

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From To Owner Type Element Scheduled Activity Date/Time Comments Interconnection
24-Oct-18 01:13 02-Aug-25 16:00 EPCOR IO C1 (Rossdale) forced outage 2,474.62 Days
Continuous		  
27-Nov-23 08:00 01-Aug-25 16:00 ENMAX Outage 32.2TR (SS-32) 32 sub 32.2TR 8 kV bus switchgear demolition 613.29 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-Jun-26 14:29 ALTALINK Outage 157s C1 (157s Lac La Biche) forced outage 676.03 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 23-Dec-25 23:00 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 316.96 Days
Continuous		 AB-SK
11-Feb-25 10:00 23-Jul-25 16:00 ATCO TE 940s Protection & Control (940s Beartrap) relay testing 162.21 Days
Continuous		  
11-Mar-25 00:00 31-Dec-25 16:00 ALTALINK Outage 377s 473C (377s AML Hardisty) forced outage 295.71 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		  
31-Mar-25 07:00 03-Oct-25 17:00 EPCOR Outage 987s T1 (987s Clover Bar), 987s CCP7213 (987s Clover Bar), 987s CCP7214 (987s Clover Bar) Cloverbar - TX1 LCR 186.42 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 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 04:01 14-Jul-25 07:30 ALTALINK Outage 799s T3 (799s Coleman) replace T3 61.15 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		  
25-May-25 07:00 01-Aug-25 17:00 EPCOR Outage 987s GT2 (987s Clover Bar) maintenance 68.42 Days
Continuous		  
29-May-25 17:31 30-Sep-25 00:00 BHE Canada Outage 120s C1 (120s Picture Butte) forced outage 123.27 Days
Continuous		 AB-MATL
08-Jun-25 15:00 25-Nov-25 15:30 ALTALINK Outage 397s 864W (397s Benbow) new 864L line construction, new 397s48 (VT6) install 170.06 Days
Continuous		  
09-Jun-25 07:00 01-Aug-25 17:00 EPCOR TE 330p Protection & Control (330p Genesee) 138/500 kV protection blocking for relay maintenance 53.42 Days
Continuous		  
09-Jun-25 07:00 15-Aug-25 17:00 EPCOR TE Protection & Control (Poundmaker) protection blocking for relay maintenance 67.42 Days
Continuous		  
09-Jun-25 13:30 18-Jul-25 18:00 ATCO Outage 716s 701C (716s Lloydminster) emergency maintenance 39.19 Days
Continuous		  
13-Jun-25 17:00 11-Feb-26 17:00 EPCOR Outage T3 (Rossdale) Rossdale - TX3 LCR 243.04 Days
Continuous		  
14-Jun-25 08:00 16-Jul-25 08:59 ALTALINK Outage 38s C2 (38s East Edmonton) forced outage 32.04 Days
Daily		  
16-Jun-25 08:00 25-Jul-25 14:00 ENMAX Outage 31.1C (SS-31) capacitor bank switcher replacement, grounding improvements 39.25 Days
Continuous		  
16-Jun-25 08:00 01-Aug-25 17:00 ATCO TE 808s Protection & Control (808s Procter & Gamble), 808s RTU/SCADA (808s Procter & Gamble) SCADA upgrade at 808S. Protection and hardwired IO on-site will need to be cut-over to new SCADA system and tested 46.38 Days
Continuous		  
25-Jun-25 18:40 01-Aug-25 17:00 ATCO Outage 801s 701T (801s Anderson) forced 36.93 Days
Continuous		  
30-Jun-25 02:00 25-Jul-25 17:00 ATCO Outage 802s 702T (802s Michichi Creek), 802s 702 (802s Michichi Creek) forced outage - tripped 25.63 Days
Continuous		  
30-Jun-25 07:00 01-Aug-25 17:00 EPCOR TE 665s Protection & Control (665s Dome) relay maintenance 32.42 Days
Continuous		  
30-Jun-25 08:00 15-Jul-25 16:00 ENMAX Outage 3.82L (SS-3 - SS-8), 3B138-3.82 (SS-3) sheath & oil testing 15.33 Days
Continuous		  
30-Jun-25 08:00 17-Jul-25 18:00 SUNCOR Outage 29PL7-2 (29EDD-18 Firebag - 29EDD-63), 29EDD-63 29PT-179 (29EDD-63 Firebag Co-Gen), 29EDD-63 30-252-11301 (29EDD-63) maintenance 17.42 Days
Continuous		  
05-Jul-25 08:00 05-Sep-25 16:00 ENMAX TE Protection & Control (SS-21) 21sub auto switching protection outage, 21.1TR replacement 62.33 Days
Daily		  
07-Jul-25 07:00 13-Jul-25 17:00 EPCOR Outage 908AL (52S East Industrial - 908L tap), 52s T2 (52s East Industrial), 52s E2402 (52s East Industrial) TX2 and E2402 doble and maintenance 6.42 Days
Continuous		  
07-Jul-25 07:00 12-Jul-25 18:00 ALTALINK Outage 113L (20s Ghost - 33s Spray), 33s 113 (33s Spray), 20s 113 (20s Ghost) structure changes on 113L (str 179,151, 152) 5.46 Days
Continuous		  
07-Jul-25 07:00 14-Jul-25 18:00 CNRL Outage 641s 702T (641s Primrose East) testing of 702T transformer and low side breaker 502 7.46 Days
Continuous		  
07-Jul-25 07:00 16-Jul-25 17:00 EPCOR Outage 987s T1 (987s Clover Bar), 987s T3 (987s Clover Bar), 987s CCP7213 (987s Clover Bar), 987s CCP7214 (987s Clover Bar), 987s C2401 (987s Clover Bar), 987s C2402 (987s Clover Bar), 987s C2407 (987s Clover Bar), 987s C2403 (987s Clover Bar), 987s CDS25 (987s Cloverbar) Cloverbar S/S TX1 bay and 240 kV bus outage 9.42 Days
Continuous		  
07-Jul-25 07:00 11-Jul-25 17:00 EPCOR Outage 72CH11 (987s Clover Bar - EP Hardisty), H725 (EP Hardisty), 987s CH724 (987s Clover Bar) doble, disconnect and breaker maintenance 4.42 Days
Continuous		  
07-Jul-25 08:00 05-Sep-25 16:00 ENMAX Outage 21.1TR (SS-21) 21.1TR replacement 60.33 Days
Continuous		  
07-Jul-25 08:00 12-Jul-25 17:30 ALTALINK RB 3L (245s Seebe - 3AL tap), 3L (272s Springbank - 3AL tap), 3L (42s Sarcee - 272s Springbank) working in proximity of 3L during 113L component replacement 5.4 Days
Daily		  
07-Jul-25 08:00 11-Jul-25 17:00 ALTALINK TE 799s RTU/SCADA (799s Coleman) addition and testing of alarms/controls associated with new T3 and associated protection upgrade 4.38 Days
Daily		  
07-Jul-25 08:00 11-Jul-25 17:00 ALTALINK TE 799s Protection & Control (799s Coleman) circuit cutover and testing 4.38 Days
Daily		  
07-Jul-25 09:00 18-Jul-25 17:30 ATCO IO 2029s Heathfield 2029S Heathfield MOD heater repair 11.35 Days
Continuous		  
07-Jul-25 09:30 11-Jul-25 19:00 ATCO Outage 808s 701T (808s Procter & Gamble), 808s 701 (808s Procter & Gamble), 808s 401 (808s Procter & Gamble) 7L13 relay replacement.
CT testing, breaker testing		 4.4 Days
Continuous		  
07-Jul-25 10:00 18-Jul-25 17:30 ATCO Outage 741s 701T (741s Fox Creek) 2025 tap changer refurbishment program and testing 11.31 Days
Continuous		  
07-Jul-25 13:00 11-Jul-25 17:00 ATCO TE 939s RTU/SCADA (939s Livock) BMS point update
 4.17 Days
Continuous		  
07-Jul-25 13:30 11-Jul-25 17:00 ALTALINK TE 72s Protection & Control (72s Leismer) relay maintenance 4.15 Days
Daily		  
08-Jul-25 09:00 11-Jul-25 17:00 BCH RB 5L96 (BCH Selkirk - BCH Vaseux Lake) heli access to towers for climbing inspections, no work on conductors, just working in proximity 3.33 Days
Continuous		 AB-BC
09-Jul-25 08:00 16-Jul-25 16:00 ATCO Outage 7L32 (813s Little Smoky - 862s South Bezanson) pole changes 7.33 Days
Continuous		  
09-Jul-25 09:00 22-Jul-25 16:00 BCH Outage 1D23 (978s BCH Britt Creek) bower tower bypass, BC maintenance does not affect the Alberta ATC 13.29 Days
Continuous		 AB-BC
11-Jul-25 07:00 17-Jul-25 18:00 ALTALINK Outage 199L (347s AML Fox Creek - 199AL tap), 347s 199E (347s AML Fox Creek) replace several 199L structures 6.46 Days
Continuous		  
11-Jul-25 07:00 17-Jul-25 18:00 ALTALINK TE 347s Protection & Control (347s Fox Creek) disable trips on 77/85/L2 6.46 Days
Daily		  
11-Jul-25 07:00 12-Jul-25 16:00 ALTALINK Outage 767L (320p Keephills - 767CL tap), 320p 767N (320p Keephills) replace keeper keys, add anchor extensions, install insulated links to guys wires 1.38 Days
Continuous		  
11-Jul-25 07:00 11-Jul-25 08:00 ALTALINK RB 199L (347s AML Fox Creek - 199AL tap), 199L (268s Whitecourt - 199AL tap) test charging current on 199L187A 60 Mins
Daily		  
12-Jul-25 07:00 13-Jul-25 18:00 ALTALINK Outage 712L (99s North St. Albert - 595s Spruce Grove), 99s 712X (99s North St. Albert), 595s 712 (595s Spruce Grove) replace arms and insulators on structures 211, 213, 222 and 223 1.46 Days
Continuous		  
12-Jul-25 08:00 29-Aug-25 16:00 ENMAX Outage 14.1C (SS-14), 14.2C (SS-14) capacitor bank switcher replacement 48.33 Days
Continuous		  
13-Jul-25 09:00 15-Jul-25 16:00 ENMAX Outage 2.1TR (SS-2) grounding improvements, surge arrestor grounding upgrade 2.29 Days
Continuous		  
14-Jul-25 07:00 25-Jul-25 17:00 EPCOR Outage 72VN21 (EP 511s Victoria - Namao), EP 511s V728 (EP 511s Victoria), EP 511s V729 (EP 511s Victoria), N725 (Namao) Victoria: VN21 Zone Doble and NDS5/VDS16/VDS22/VDS23 Disconnect Maintenance and UGT Pressure Sensor Install (Victoria) 11.42 Days
Continuous		  
14-Jul-25 07:00 25-Jul-25 17:00 EPCOR, ALTALINK RB 1059AL (52s East Industrial - 1059L tap), 1059L (38s East Edmonton - 1059AL tap), 1059L (EP 803s Lambton - 1059AL tap) pole refurbishment 11.42 Days
Continuous		  
14-Jul-25 07:00 15-Jul-25 17:00 ALTALINK RB 170L (632s Russell - 799s Coleman) build bypass around 799s 1.42 Days
Daily		  
14-Jul-25 07:00 15-Jul-25 17:00 ALTALINK RB 786L (799s Coleman - BCH Natal) build bypass around 799s 1.42 Days
Continuous		  
14-Jul-25 07:00 25-Jul-25 17:00 ALTALINK, EPCOR RB 1059L (38s East Edmonton - 1059AL tap) pole refurbishment 11.42 Days
Continuous		  
14-Jul-25 07:00 17-Jul-25 17:00 ALTALINK TE 135s RTU/SCADA (135s Conrad) change of subnet and IP address of All affected IED’s of this substation and update the RTU configuration accordingly 3.42 Days
Daily		  
14-Jul-25 07:00 17-Jul-25 14:00 ALTALINK Outage 681s T1 (681s Bannerman) T1 Outage to service 17-NGR6101A (NGR1-2) & 17-NGR6101B (NGR1-1) for customer 3.29 Days
Daily		  
14-Jul-25 07:00 14-Jul-25 15:00 ALTALINK Outage 754L (437s Baymag - 742L tap) general maintenance & inspection on 754L78 8 Hours
Daily		  
14-Jul-25 07:00 08-Aug-25 17:00 EPCOR TE Protection & Control (EPCOR Riverview) relay maintenance 25.42 Days
Continuous		  
14-Jul-25 08:00 27-Sep-25 17:00 ALTALINK TE 294s RTU/SCADA (294s Brazeau Outletworks) RTU database updates 75.38 Days
Daily		  
14-Jul-25 08:00 14-Jul-25 09:00 ALTALINK Outage 799s 138kV Bus (799s Coleman), 170L (632s Russell - 799s Coleman), 799s T3 (799s Coleman) outage required for t3 test energization 60 Mins
Daily		 AB-BC
14-Jul-25 08:00 14-Jul-25 12:00 ALTALINK TE 799s Protection & Control (799s Coleman) disable certain protections to protect 799s load during T3 test energization 4 Hours
Daily		  
14-Jul-25 08:00 01-Aug-25 16:00 ENMAX Outage 14.83L (SS-14 - SS-36), 14B138-14.83 (SS-14), 36B138-14.83 (SS-36) capacitor bank switcher replacement and replace 14B138-14.83 18.33 Days
Continuous		  
14-Jul-25 08:00 17-Jul-25 16:00 ENMAX Outage 8.1TR (SS-8) transformer testing and maintenance 3.33 Days
Continuous		  
14-Jul-25 08:00 15-Jul-25 16:00 ENMAX TE Protection & Control (SS-32) 32sub 138kV bus differential protection outage 1.33 Days
Continuous		  
14-Jul-25 09:00 16-Jul-25 12:00 ATCO Outage 826s 907 (826s Marguerite Lake) breaker maintenance 2.13 Days
Continuous		  
14-Jul-25 09:00 18-Jul-25 17:00 BCH Outage 5L96 (BCH Selkirk - BCH Vaseux Lake) replace markerballs and insulators BC maintenance does not affect the Alberta ATC 4.33 Days
Continuous		 AB-BC
14-Jul-25 09:00 15-Jul-25 09:00 ALTALINK IO 799s T3 (799s Coleman) T3 Soak 24 Hours
Continuous		  
14-Jul-25 09:00 17-Jul-25 18:00 ALTALINK Outage 799L (235s Entwistle - 443s South Mayerthorpe) 799L rebuild (Str 731-830) 3.38 Days
Continuous		  
14-Jul-25 09:00 15-Jul-25 16:00 ATCO Outage 7L133 (786s High Level - 828s Sulphur Point), 828s 703 (828s Sulphur Point), 786s 704 (786s High Level) breaker maintenance and testing 31 Hours
Continuous		  
14-Jul-25 09:30 25-Jul-25 17:00 ALTALINK, EPCOR Outage 1058L (657s Summerside - EP 803s Lambton), EP 803s L2403 (EP 803s Lambton), EP 803s L2404 (EP 803s Lambton), 657s SU2403 (657s Summerside), 657s SU2404 (657s Summerside) pole refurbishment, zone doble, disconnect maintenance, l2403 sf6 leak repair 11.31 Days
Continuous		  
14-Jul-25 10:00 17-Jul-25 17:00 ALTALINK TE 95s RTU/SCADA (95s Imperial Oil Edmonton) SCADA upgrade of site RTU from D20 to SMP 3.29 Days
Daily		  
14-Jul-25 10:30 17-Jul-25 15:30 ATCO Outage 7L89 (700s Bonnyville - 721s La Corey), 700s 703 (700s Bonnyville) climbing inspection and deficiency repair 3.21 Days
Continuous		  
14-Jul-25 11:00 17-Jul-25 17:00 ALTALINK TE 155s RTU/SCADA (155s Blackmud) RTU database update 3.25 Days
Daily		  
14-Jul-25 11:00 17-Jul-25 17:00 ALTALINK TE 95s Protection & Control (95s Imperial Oil Edmonton) updating DNP MAP on protection relays for SCADA upgrade project 3.25 Days
Daily		  
14-Jul-25 11:30 14-Jul-25 17:30 ALTALINK Outage 338s 452 (338s Cherhill) 138kV breaker maintenance, test CTs 6 Hours
Daily		  
14-Jul-25 12:30 17-Jul-25 18:00 ALTALINK Outage 151s C1 (151s Strathmore) protection upgrade project on A5050/51/27/59/60/C1 protection at 151s Strathmore 3.23 Days
Continuous		  
14-Jul-25 12:30 16-Jul-25 17:00 ALTALINK Outage 17s T3 (17s Benalto), 17s 2852 (17s Benalto) PRC005 doble and maintenance 2.19 Days
Continuous		  
14-Jul-25 12:30 16-Jul-25 16:30 ALTALINK Outage 725AL (618s Riverbend - 725L tap), 618s 725 (618s Riverbend) urgent 618s725 gauge replacement, several trouble calls over the last few weeks, major maintenance on the breaker 2.17 Days
Continuous		  
14-Jul-25 13:00 17-Jul-25 17:30 ALTALINK TE 151s Protection & Control (151s Strathmore) protection upgrade project on A50/51/27/59/60/C1 3.19 Days
Continuous		  
14-Jul-25 13:00 17-Jul-25 17:30 ALTALINK TE 151s RTU/SCADA (151s Strathmore) RTU outages required during protection upgrade project 3.19 Days
Daily		  
14-Jul-25 13:30 15-Jul-25 17:30 ALTALINK Outage 38s 7652 (38s East Edmonton) PRC005 brk maint. + first trip + Rebuild dashpots 28 Hours
Continuous		  
14-Jul-25 14:00 17-Jul-25 15:00 ALTALINK Outage 140s T1 (140s Thompson), 140s 152 (140s Thompson) 138kV breaker maintenance (140s152), transformer maintenance (TX18839) 3.04 Days
Continuous		  
15-Jul-25 07:00 17-Jul-25 18:00 ALTALINK TE AltaLink Telecom Equipment MPLS node addition upgrade 2.46 Days
Daily		  
15-Jul-25 07:00 16-Jul-25 17:00 ALTALINK TE 194s RTU/SCADA (194s South Red Deer) 194s BMI project - complete I/O board removal and push new RTU configuration for the point change 1.42 Days
Daily		  
15-Jul-25 07:30 15-Jul-25 17:30 ALTALINK Outage 37s T6 (37s North Calder), 37s 4 (37s North Calder) extend T6 CT wiring to DDR 10 Hours
Daily		  
15-Jul-25 08:00 17-Jul-25 19:00 ATCO Outage 2081s 701T (2081s Meadow Creek), 7LA183 (2081s Meadow Creek - 7L183 tap) 701T transformer major 2.46 Days
Continuous		  
15-Jul-25 08:00 16-Jul-25 17:00 ALTALINK Outage 510s 1952 (510s Sunnybrook) replace grading caps 1.38 Days
Continuous		  
15-Jul-25 08:00 15-Jul-25 17:00 ALTALINK, TRANSALTA TE AltaLink Telecom Equipment, 502s RTU/SCADA (502s Shell Waterton (#2)), 229s RTU/SCADA (229s Glenwood) complete MPLS upgrade, raw socket conversion and LAN switch at 112S Windy Points 9 Hours
Daily		  
15-Jul-25 08:30 15-Jul-25 17:30 ALTALINK Outage 338s 152 (338s Cherhill) 138kV breaker maintenance, test CTs 9 Hours
Daily		  
15-Jul-25 08:30 17-Jul-25 12:00 ATCO TE 845s Protection & Control (845s Big Mountain) block 21B/7L13 relay in order to move it to it's permanent location in panel 1G 2.15 Days
Continuous		  
15-Jul-25 08:30 15-Jul-25 13:30 ALTALINK Outage 706L (54s Fort Saskatchewan - 706AL tap), 54s 706N (54s Fort Saskatchewan) general maintenance and inspections 5 Hours
Daily		  
15-Jul-25 09:00 15-Jul-25 17:00 ATCO TE ATCO Telecom Equipment, 707s RTU/SCADA (707s St. Paul) PM on radio at Hairy Hill tower facing 707s 8 Hours
Continuous		  
15-Jul-25 09:00 17-Jul-25 08:00 ALTALINK Outage 799s T3 (799s Coleman) install temporary cables from T3 to 799s175W to support T1 and 25kV Bus outage 1.96 Days
Continuous		  
15-Jul-25 09:00 15-Jul-25 09:30 BCH Outage 5L72 (BCH Mica G.S. - BCH Nicola) MCA 500 kV switching to open 5D4 for switching training
30 Mins
Continuous		 AB-BC
15-Jul-25 09:00 15-Jul-25 18:00 BCH TE Protection & Control (BCH Natal) 786L zone 2 settings changes due to the 799s bypass work 9 Hours
Continuous		  
15-Jul-25 13:31 15-Jul-25 17:30 ALTALINK Outage 708L (71s Lamoureux - 708AL tap) general maintenance and inspections 3.98 Hours
Daily		  
15-Jul-25 16:30 15-Jul-25 17:00 BCH Outage 5L72 (BCH Mica G.S. - BCH Nicola) MCA 500 kV switching to close 5D4 for switching training


30 Mins
Continuous		 AB-BC
16-Jul-25 07:00 19-Jul-25 19:00 ATCO Outage 7L16 (766s Nevis - 948s Heatburg), 766s 702 (766s Nevis), 948s 703 (948s Heatburg) string 926L/986L over 7L16 3.5 Days
Continuous		  
16-Jul-25 07:00 22-Jul-25 17:00 ALTALINK, AESO-SC Outage 454s Buck Lake, 454s 138kV Bus (454s Buck Lake), 835L (283s Violet Grove - 835AL tap), 835L (384s Keystone - 835AL tap), 835AL (454s Buck Lake - 835L tap), 454s T1 (454s Buck Lake), 454s T2 (454s Buck Lake), 283s 835E (283s Violet Grove), 384s 835X (384s Keystone), 454s 835A (454s Buck Lake), 454s 1152 (454s Buck Lake), 454s 2134 (454s Buck Lake), 454s LOAD (454s Buck Lake), 454s 4009 (454s Buck Lake), 454s 3400 (454s Buck Lake) LCM - install structure extension arms and retrofit structures with post insulators 6.42 Days
Continuous		  
16-Jul-25 07:00 17-Jul-25 17:00 ALTALINK TE 135s Protection & Control (135s Conrad) outage to update relay IP address in line with scada work 1.42 Days
Daily		  
16-Jul-25 07:00 16-Jul-25 18:00 ALTALINK TE AltaLink Telecom Equipment, AltaLink RTU/SCADA (AltaLink) MPLS node addition upgrade 11 Hours
Daily		  
16-Jul-25 07:00 16-Jul-25 13:00 NWE, BHE Canada, BHE Outage Hay Lake (NorthWestern Energy) - Marias (MATL), North Series Capacitor (BHE Hay Lake) remove wire bus 6 Hours
Continuous		 AB-MATL
16-Jul-25 07:00 19-Sep-25 17:00 NWE Outage 2366 (NWE Marias) install new equipment at Marias 65.42 Days
Continuous		 AB-MATL
16-Jul-25 08:00 17-Jul-25 08:00 ALTALINK Outage 786L (799s Coleman - BCH Natal), 799s 1 (799s Coleman), 799s 786W (799s Coleman) line crew will drop span into sub 24 Hours
Continuous		 AB-BC
16-Jul-25 08:00 16-Jul-25 17:00 ALTALINK TE AltaLink Telecom Equipment node upgrade 9 Hours
Daily		  
16-Jul-25 08:00 29-Jul-25 20:00 SUNCOR Outage 29PL6-1 (30EDD-1 - 29EDD-55), 30EDD-1 29PL6-1CS (30EDD-1) PM 5y,10y, repair / replace 29PL6-1 terms
 13.5 Days
Continuous		  
16-Jul-25 08:30 17-Jul-25 17:30 ALTALINK Outage 338s T2 (338s Cherhill) doble and maintenance 1.38 Days
Continuous		  
16-Jul-25 08:30 16-Jul-25 13:30 ALTALINK Outage 726L (37s North Calder - 71s Lamoureux), 37s 726E (37s North Calder) general maintenance and inspections 5 Hours
Daily		  
16-Jul-25 09:00 16-Jul-25 17:00 ALTALINK Outage 38s C2 (38s East Edmonton) breaker maintenance and investigate breaker trouble alarm 8 Hours
Continuous		  
16-Jul-25 09:00 16-Jul-25 09:30 BCH Outage 5L72 (BCH Mica G.S. - BCH Nicola) MCA 500kV switching to OPEN 5D4 for switching training
30 Mins
Continuous		 AB-BC
16-Jul-25 09:00 18-Jul-25 12:00 ENMAX Outage 2.2TR (SS-2) grounding improvements, surge arrestor grounding upgrade 2.13 Days
Continuous		  
16-Jul-25 10:00 16-Jul-25 14:00 ALTALINK, TRANSALTA Outage 250p T1 (250p Bighorn Plant), 250p 1 (250p Bighorn Plant) maintenance 4 Hours
Daily		  
16-Jul-25 12:01 18-Jul-25 16:00 ATCO Outage 826s 908 (826s Marguerite Lake) breaker maintenance 2.17 Days
Continuous		  
16-Jul-25 13:31 16-Jul-25 15:13 ALTALINK Outage 761L (38s East Edmonton - 71s Lamoureux), 38s 761N (38s East Edmonton) general maintenance and inspections 102 Mins
Daily		  
16-Jul-25 16:30 16-Jul-25 17:00 BCH Outage 5L72 (BCH Mica G.S. - BCH Nicola) MCA 500kV switching to close 5D4 for switching training
30 Mins
Continuous		 AB-BC
17-Jul-25 07:00 17-Jul-25 18:00 ALTALINK TE AltaLink Telecom Equipment MPLS node addition upgrade. 11 Hours
Daily		  
17-Jul-25 08:00 30-Jul-25 15:00 ALTALINK Outage 799s 138kV Bus (799s Coleman), 786L (799s Coleman - BCH Natal), 799s T1 (799s Coleman), 799s 786W (799s Coleman) install bird cover in 25kV 13.29 Days
Continuous		 AB-BC
17-Jul-25 08:00 17-Jul-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 247s RTU/SCADA (247s Piper Creek) project is to complete MPLS upgrade, 9 Hours
Daily		  
17-Jul-25 08:00 18-Jul-25 20:00 SUNCOR TE 29EDD-60 RTU/SCADA (29EDD-60 Inglis Island), 29EDD-61 RTU/SCADA (29EDD-61 Stony Island) configure SEL3555 DFR at both locations. 1.5 Days
Continuous		  
17-Jul-25 08:30 17-Jul-25 16:30 ALTALINK Outage 74s C3 (74s Janet), 74s 102 (74s Janet) urgent maintenance 8 Hours
Daily		  
17-Jul-25 09:00 17-Jul-25 17:00 ALTALINK Outage 38s 3052 (38s East Edmonton), 38s C1 (38s East Edmonton) breaker maintenance 8 Hours
Continuous		  
17-Jul-25 09:00 17-Jul-25 14:00 ALTALINK TE AltaLink Telecom Equipment flash card replacement. 5 Hours
Daily		  
17-Jul-25 09:00 17-Jul-25 17:00 RESC Outage 516s T2 (516s Forty Mile), 516s 240CB2 (516s Forty Mile), 516s 5CAPCB2 (516s Forty Mile), 516s 35CB4 (516s Forty Mile), 516s 35CB5 (516s Forty Mile), 516s 35CB6 (516s Forty Mile) troubleshooting on 240CB2 spring load mechanism 8 Hours
Continuous		  
17-Jul-25 09:00 17-Jul-25 12:00 ENMAX TE 15.60L (SS-15 - SS-21) 15.60L A and B Line Protection Outage. Transfer from JMUX to JPAX circuits 3 Hours
Continuous		  
17-Jul-25 10:00 17-Jul-25 14:00 ALTALINK, TRANSALTA Outage 250p T2 (250p Bighorn Plant), 250p 2 (250p Bighorn Plant) maintenance 4 Hours
Daily		  
18-Jul-25 08:00 18-Jul-25 12:00 ENMAX Outage 22B138-22BT8 (SS-22) HV breaker SF6 gas sample - 22B138-22BT8 4 Hours
Continuous		  
18-Jul-25 08:00 18-Jul-25 17:00 ALTALINK TE 74s RTU/SCADA (74s Janet) techs require a supervisory outage to complete RTU config changes for AC Fail Alarms 9 Hours
Daily		  
18-Jul-25 12:00 18-Jul-25 16:00 ENMAX Outage 22.81L (SS-22 - SS-39), 39B138-22.81 (SS-39), 22B138-22.81 (SS-22) HV breaker SF6 gas sample - 39B138-22.81 4 Hours
Continuous		  

Prepared On:   2025-07-11   16:40:35

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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