Alberta Electric System Operator
System Co-ordination Plan
2026-08-20 to 2026-08-28
Approved Outages

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From To Owner Type Element Scheduled Activity Date/Time Comments Interconnection
26-Jul-24 10:00 30-Jun-27 16:00 ATCO Outage 826s 504R (826s Marguerite Lake) emergency removal to replace failed 502R @834S 25,662 Hours
Continuous		  
20-Mar-25 08:00 30-Sep-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 13,425 Hours
Continuous		  
25-Nov-25 17:46 18-Sep-26 18:00 ATCO Outage 876s 901T (876s Brintnell) forced outage oil leaking 7,127.23 Hours
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 17,528 Hours
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), 29EDD-34 29PS-216 (29EDD-34) urgent repairs on 29PT-224 at 29EDD34 on 29PP-45 bus 5,791 Hours
Continuous		  
21-Jan-26 08:00 30-Oct-26 16:00 ENMAX Outage 5.7TR (SS-5) 25kV switchgear replacement 6,775 Hours
Continuous		  
06-Mar-26 17:00 13-Nov-26 17:00 EPCOR Outage T1 (Woodcroft) woodcroft: TX1 LCR civil 6,048 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 6,368 Hours
Continuous		  
11-Mar-26 13:45 15-Sep-26 08:59 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 4,507.23 Hours
Continuous		  
01-May-26 17:00 25-Nov-26 17:00 EPCOR Outage T1 (Meadowlark) T1 LCR civil work 4,993 Hours
Continuous		  
19-May-26 07:00 02-Oct-26 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) protection blocking - relay maintenance and bus differential upgrade project 2,434 Hours
Continuous		  
04-Jun-26 07:01 10-Feb-27 17:00 EPCOR Outage T1 (Rossdale) rossdale: TX1 lcr civil 6,034.98 Hours
Continuous		  
07-Jun-26 17:05 01-Oct-26 00:00 ACCIONA, ENBRIDGE, ICPCL Outage 139s C1 (139s Hillridge) forced outage 2,766.92 Hours
Continuous		  
08-Jun-26 07:00 04-Dec-26 17:00 EPCOR TE EP 511s Protection & Control (EP 511s Victoria) 72kV breaker fail protection blocking 2,626 Hours
Continuous		  
15-Jun-26 07:00 18-Dec-26 17:00 EPCOR TE 805s Protection & Control (805s Jasper) protection blocking, breaker replacement project 1,954 Hours
Continuous		  
19-Jun-26 17:00 03-Dec-27 17:00 EPCOR Outage EP 511s Victoria T3 (EP 511s Victoria) emergency outage due to degraded asset condition 12,769 Hours
Continuous		  
10-Jul-26 08:00 18-Nov-26 16:00 Syncrude Outage 815 (Syncrude Mildred Lake), 816 (Syncrude Mildred Lake) replace 72 kV underground feeder cables on west mine feeder 2,696 Hours
Continuous		  
14-Jul-26 00:00 31-Aug-26 00:00 ALTALINK Outage 151s C1 (151s Strathmore) forced outage 1,152 Hours
Continuous		  
14-Jul-26 08:00 01-Oct-26 17:00 ALTALINK Outage 287s 552 (287s Hazelwood) 287s552 must be open during 443L and 417L outage for the 214s AIS to work properly 1,905 Hours
Continuous		  
15-Jul-26 14:01 28-Sep-26 09:00 ALTALINK Outage 417L (55s Olds - 281s Johnson), 55s T1 (55s Olds), 55s T2 (55s Olds), 55s 417 (55S Olds), 287s 552 (287s Hazelwood), 55s 2 (55s Olds) mobile install at 55s for P_C major upgrade, repair/replace s80, s83, s84. salvage s51. 1,962.98 Hours
Continuous		  
20-Jul-26 07:00 31-Dec-26 17:00 EPCOR TE Protection & Control (Woodcroft) woodcroft: protection blocking for TX1 LCR, line protection testing, and repairs 3,947 Hours
Continuous		  
20-Jul-26 07:00 04-Sep-26 17:00 EPCOR TE 330p Protection & Control (330p Genesee) genesee: protection blocking, firmware updates 1,114 Hours
Continuous		  
27-Jul-26 07:00 20-Aug-26 17:00 EPCOR Outage EP 805s J2401 (EP 805s Jasper) Jasper: J2401 replacement LCR 946 Hours
Continuous		  
27-Jul-26 10:00 31-Aug-26 17:00 ATCO Outage 827s 701T (827s Cranberry Lake) class2 major testing
 76 Hours
Continuous		  
01-Aug-26 08:00 31-Aug-26 20:00 SUNCOR Outage 29EDD-60 29PT-702 (29EDD-60 Inglis Island) IBP pressure low 732 Hours
Continuous		  
03-Aug-26 08:00 28-Aug-26 16:00 ENMAX Outage 2.82L (SS-2 - SS-5), 5B138-2.82 (SS-5) A phase replacement, 12 hr soak test 608 Hours
Continuous		  
03-Aug-26 08:00 04-Sep-26 16:00 ENMAX TE Protection & Control (SS-5) 5 sub zone 31 auto switching protection scheme outage, 25kV switchgear addition 776 Hours
Daily		  
03-Aug-26 08:00 30-Oct-26 16:00 ALTALINK TE 55s RTU/SCADA (55s Olds) adding/testing new alarms & controls associated with the 55s P&C 2,120 Hours
Daily		  
04-Aug-26 07:03 17-Sep-26 17:00 ALTALINK Outage 869L (163s Amoco Empress - 204s Sandy Point), 204s T1 (204s Sandypoint), 163s 869W (163s Amoco Empress) customer maintenance work 777.95 Hours
Continuous		  
04-Aug-26 08:00 23-Aug-26 16:00 ENMAX, ALTALINK Outage 24.83L (74s Janet - SS-24), 74s 24.83X (74s Janet) wood pole installation 416 Hours
Continuous		  
04-Aug-26 08:00 24-Aug-26 16:00 ALTALINK, ENMAX IO 74s 24.83X (74s Janet), 24.83L (74s Janet - SS-24) Enmax wood pole installation 488 Hours
Continuous		  
05-Aug-26 07:00 21-Aug-26 17:00 EPCOR Outage 72LH8 (EP 803s Lambton - EP Hardisty) aerial pole LCR (3 poles) and surge arrestor repair and HDS13 repair 394 Hours
Continuous		  
05-Aug-26 13:00 05-Sep-26 13:00 ATCO TE 2085s Protection & Control (2085s Sheridan) power quality meter install at 2085s Sheridan
 744 Hours
Continuous		  
10-Aug-26 07:30 02-Oct-26 17:00 ALTALINK Outage 434s T3 (434s East Stony Plain) T3 transformer replacement 1,281.5 Hours
Continuous		  
10-Aug-26 10:00 20-Aug-26 17:30 ATCO TE 2029s Protection & Control (2029s Heathfield) relay firmware upgrade 247.5 Hours
Continuous		  
10-Aug-26 23:52 21-Aug-26 17:00 ATCO Outage 7L171 (802s Michichi Creek - 804s Wintering Hills), 802s 706 (802s Michichi Creek), 804s 701 (804s Wintering Hills) forced outage 257.13 Hours
Continuous		  
11-Aug-26 10:00 24-Aug-26 16:00 ATCO Outage 6L96 (735s Swan River - 743s Sarah Lake), 743s 604 (743s Sarah Lake), 735s 604 (735s Swan River) 743S sarah lake rebuild, replace breaker 604 318 Hours
Continuous		  
13-Aug-26 16:31 24-Sep-26 17:00 ALTALINK Outage 71s T1 (71s Lamoureux) bushing issue 1,008.48 Hours
Continuous		  
13-Aug-26 16:31 27-Aug-26 17:00 ALTALINK Outage 71s C2 (71s Lamoureux), 71s 1052 (71s Lamoureux) issue with cap bank 336.48 Hours
Continuous		  
14-Aug-26 10:00 28-Aug-26 17:30 ATCO Outage 7L65 (709s Vegreville - 7LA65 tap), 709s 703 (709s Vegreville) 7L65 rebuild - phase 3 - protection upgrade at 709S, 708S and 710S
343.5 Hours
Continuous		  
14-Aug-26 12:00 21-Aug-26 17:30 ATCO TE 709s Protection & Control (709s Vegreville) 7L65 rebuild - phase 3

173.5 Hours
Continuous		  
17-Aug-26 07:00 23-Aug-26 17:00 EPCOR Outage 72LH8 (EP 803s Lambton - EP Hardisty), T2 (EP Hardisty), H722 (EP Hardisty), H723 (EP Hardisty) disconnect and breaker maintenance 154 Hours
Continuous		  
17-Aug-26 07:00 21-Aug-26 18:00 ALTALINK, BCH RB 1201L (520s Bennett - BCH Cranbrook) conductor inspection on STR's 21-22, 50-51, 187-188, 279-280
107 Hours
Continuous		  
17-Aug-26 07:00 23-Aug-26 17:00 EPCOR TE RTU/SCADA (University of Alberta) cutovers and commissioning 154 Hours
Continuous		  
17-Aug-26 07:00 24-Aug-26 17:00 ENMAX Outage 27.1TR (SS-27) emergency outage 178 Hours
Continuous		  
17-Aug-26 08:00 27-Aug-26 16:00 Syncrude Outage MH2 (Aurora - Aurora), 33 (Aurora), 34 (Aurora), 33B (Aurora), 34A (Aurora), 89-37 (Aurora) zone 13 6yr PM 248 Hours
Continuous		  
17-Aug-26 08:00 24-Aug-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole replacement from test and treat 176 Hours
Continuous		  
17-Aug-26 08:00 27-Aug-26 15:00 CMH TE MH-15L (MHS-7 Brier Park - MHS-9 South Saskatchewan) carry out maintenance on the LDR-15L-A 247 Hours
Continuous		  
17-Aug-26 08:00 20-Aug-26 17:00 ALTALINK TE 310p Protection & Control (310p Sundance) CT 1152 testing 81 Hours
Daily		  
17-Aug-26 08:00 20-Aug-26 16:00 ENMAX Outage 3.3TR (SS-3) tap changer inspection, oil leaks 80 Hours
Continuous		  
17-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 89s Protection & Control (89s Ellerslie) MPLS TPR re-arrangements project: 908L (Ellerslie 89S -Petrolia E816s) relay testing and cutover 608 Hours
Continuous		  
17-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 37s Protection & Control (37s North Calder) 930L (North Calder 37S -Poundmaker EPCOR) relay testing and cutover 608 Hours
Continuous		  
17-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 367s Protection & Control (367s Harry Smith) 1139L (Harry Smith 367S -Riverview EPCOR) MPLS TPR re-arrangements project, EPCOR relay testing and cutover 608 Hours
Continuous		  
17-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 37s Protection & Control (37s North Calder) 920LE (North Calder 37S -E557s Castle Downs EPCOR) EPCOR relay testing and cutover 608 Hours
Continuous		  
17-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 71s Protection & Control (71s Lamoureux) 920LW (Lamoreux 71S -E557s Castle Downs EPCOR) MPLS TPR re-arrangements project, EPCOR relay testing and cutover 608 Hours
Continuous		  
17-Aug-26 08:00 21-Aug-26 16:00 ATCO TE 888s Protection & Control (888s Dover) settings change on 9L43 for Telecom work 1-00524242
104 Hours
Continuous		  
17-Aug-26 09:00 20-Aug-26 17:00 ALTALINK Outage 310p 1252 (310p Sundance), 310p 1152 (310p Sundance), 310p 11A (310p Sundance), 310p 12B (310p Sundance) replace 310p1152 BKR CT's and repair switch 310p11A 81 Hours
Continuous		  
17-Aug-26 09:00 20-Aug-26 17:30 ALTALINK Outage 761L (38s East Edmonton - 71s Lamoureux), 38s 761N (38s East Edmonton) transmission line maintenance 80.5 Hours
Continuous		  
17-Aug-26 09:00 20-Aug-26 20:00 SUNCOR Outage 29PL9-24 (29EDD-94 Voyageur - 29EDD-60 Inglis Island), 29EDD-60 29PT-702 (29EDD-60 Inglis Island), 29EDD-94 29-952-9712 (29EDD-94 Voyageur), 29EDD-94 29-952-9711 (29EDD-94 Voyageur), 29EDD-60 30-252-400001 (29EDD-60 Inglis Island) 29PS-641 Requires to be realigned as it is not seated correctly while closed. This should be completed in the current outage window of GTG-12 / along with Outage 1-00530435, WO# 300769279 83 Hours
Continuous		  
17-Aug-26 09:30 22-Aug-26 17:00 ALTALINK, EPCOR IO 920L (71s Lamoureux - 557s Castle Downs) CT/CVT doble and surge arrestor LCR 127.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 908L (89s Ellerslie - 816s Petrolia) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 1139L (367s Harry Smith - EP Riverview) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 930L (37s North Calder - Poundmaker) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 1045L (EP 805s Jasper - 1045AL tap) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 920L (71s Lamoureux - 557s Castle Downs) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 920L (37s North Calder - 557s Castle Downs) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 10:00 27-Aug-26 17:30 ATCO TE 2075s Protection & Control (2075s Newell) 20DL02.06+R1-F873 (9L1087) relay firmware upgrade 271.5 Hours
Continuous		  
17-Aug-26 11:00 20-Aug-26 16:00 ALTALINK TE 320p Protection & Control (320P Keephills) protection outages required to isolate for 320p652 CT replacement 77 Hours
Continuous		  
17-Aug-26 11:00 20-Aug-26 16:00 ATCO RB 7L85 (801s Anderson - ATC 803s Bullpound), 7L85 (804s Wintering Hills - 7LA85 tap) installing interphase spacers on 7L85 live line 77 Hours
Continuous		  
17-Aug-26 11:00 20-Aug-26 16:00 ALTALINK TE 245s Protection & Control (245s Seebe) 245s777X CT replacement 77 Hours
Continuous		  
17-Aug-26 11:00 21-Aug-26 17:00 BCH Outage 5L91 (BCH Ashton Creek - BCH Selkirk) end of life insulator replacement 102 Hours
Continuous		 AB-BC
17-Aug-26 11:30 24-Aug-26 14:30 ATCO, ALTALINK RB 199L (347s AML Fox Creek - 741s ATC Fox Creek) 14 red tag pole change program 171 Hours
Continuous		  
17-Aug-26 12:00 20-Aug-26 17:00 ALTALINK Outage 777L (48s Pocaterra - 245s Seebe), 245s 777X (245s Seebe) 245s777X 138kV CT replacement 77 Hours
Continuous		 AB-BC
17-Aug-26 12:00 24-Aug-26 14:00 ATCO, ALTALINK RB 7L199 (347s AML Fox Creek - 741s ATC Fox Creek) 14 red tag pole change program 170 Hours
Continuous		  
17-Aug-26 12:00 20-Aug-26 14:00 ATCO Outage 6L12 (774s Monitor - 6L25 tap), 774s 601 (774s Monitor) structure replacements and deficiency repair 74 Hours
Continuous		  
17-Aug-26 12:30 20-Aug-26 17:00 ALTALINK Outage 320p 652 (320p Keephills) replace 320p652 external CT's 76.5 Hours
Continuous		  
17-Aug-26 13:00 20-Aug-26 13:00 ATCO Outage 828s 702 (828s Sulphur Point) breaker SF6 LTB145D1/B complete testing
72 Hours
Continuous		  
17-Aug-26 14:00 25-Aug-26 17:00 ALTALINK, FORTIS Outage 275s T1 (275s Jenner), 275s 38 (275s Jenner), 275s 2152 (275s Jenner), 275s 39 (275s Jenner), 275s 2036N (275s Jenner), 275s 2269 (275s Jenner), 275s 81 (275s Jenner), 275s 52 (275s Jenner), 275s 52-1-BFL1 (275s Jenner), 275s 52-1-BFL2 (275s Jenner), 275s 52F1 (275s Jenner), 275s 52F2 (275s Jenner) replace LV bushings, TC Maintenance, copper cutouts 195 Hours
Continuous		  
17-Aug-26 14:00 20-Aug-26 16:30 ALTALINK Outage 574s T1 (574s Nilrem) transformer maintenance 74.5 Hours
Continuous		  
18-Aug-26 07:00 21-Aug-26 18:00 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) HOP required for installing interphase spacers on 7L760 live line and installing bird flight diverters on shield wire. 83 Hours
Daily		  
18-Aug-26 07:00 24-Aug-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 21A/6L96 154 Hours
Continuous		  
18-Aug-26 07:30 27-Aug-26 08:30 ALTALINK Outage 77s 752 (77s Sagitawah) protection upgrade 77s752 217 Hours
Continuous		  
18-Aug-26 08:00 21-Aug-26 17:00 ATCO RB 7L760 (767s Oyen - 7LC760 tap) HOP required for installing interphase spacers on 7L760 live line and installing bird flight diverters on shield wire 105 Hours
Continuous		  
18-Aug-26 08:00 20-Aug-26 16:00 ALTALINK TE 138s Protection & Control (138s Windy Flats) removing for maintenance, 603L, 608L, 1037L, 1038L A & B removed one at a time, redundant protection at all times 56 Hours
Daily		  
18-Aug-26 08:00 24-Aug-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) blocking 21B/6L96 for relay testing 153 Hours
Continuous		  
18-Aug-26 08:00 24-Aug-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 50BF/604 for relay testing 153 Hours
Continuous		  
18-Aug-26 08:00 24-Aug-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 86-50BF-1/600BS1 and 94-50BF-1/600BS1. 153 Hours
Continuous		  
18-Aug-26 09:30 22-Aug-26 17:00 ALTALINK, EPCOR Outage 920L (71s Lamoureux - 557s Castle Downs), 557s CD2405 (557s Castle Downs), 557s CD2404 (557s Castle Downs), 557s CDDS14 (557s Castle Downs), 557s CDDS8 (557s Castle Downs) CT/CVT doble and surge arrestor LCR 103.5 Hours
Continuous		  
18-Aug-26 09:30 25-Aug-26 17:00 ALTALINK Outage 92s T1 (92s Viscount) Forced outage due to a bad bushing 175.5 Hours
Continuous		  
19-Aug-26 08:00 20-Aug-26 16:00 ENMAX Outage 13.82L (SS-13 - SS-22), 22B138-13.82 (SS-22) HV breaker maintenance 32 Hours
Continuous		  
19-Aug-26 08:00 22-Aug-26 16:00 ALTALINK TE 38s RTU/SCADA (38s East Edmonton) loss of ACC visibility for up to 10 minutes to replace the failing RTU/HMI-B 80 Hours
Daily		  
19-Aug-26 08:00 20-Aug-26 17:00 ATCO RB 9L05 (809s Louise Creek - 813s Little Smoky) installing marker cones on 9L02/05 at span 345 33 Hours
Continuous		  
19-Aug-26 08:00 20-Aug-26 19:00 ATCO RB 9L02 (809s Louise Creek - 813s Little Smoky) installing marker cones on 9L02/06 span at str 345 35 Hours
Continuous		  
19-Aug-26 08:00 20-Aug-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 89s RTU/SCADA (89s Ellerslie) upgrade MPLS and firewall 32 Hours
Daily		  
19-Aug-26 08:00 20-Aug-26 16:00 ALTALINK TE 320p RTU/SCADA (320P Keephills) correct CTRL IED trouble found at site, potentially need to push a configuration to correct 32 Hours
Daily		  
19-Aug-26 09:00 20-Aug-26 16:00 ALTALINK TE 12s Protection & Control (12s Heartland) Atco requested 12L85 line protection testing 31 Hours
Continuous		  
19-Aug-26 10:00 20-Aug-26 16:00 ATCO Outage 7L71 (848s Ruth Lake - 2082s Dog Rib), 848s 701 (848s Ruth Lake) breaker maintenance 30 Hours
Continuous		  
19-Aug-26 10:00 21-Aug-26 17:30 ATCO, ENEL TE 7LA65 (708s Grizzly Bear - 7L65 tap) 7L65 rebuild, 21A/7LA65 and 21B/7LA65 relay settings updates + end-to-end testing
 55.5 Hours
Continuous		  
19-Aug-26 10:00 21-Aug-26 17:30 ATCO TE 710s Protection & Control (710s Vermilion) 7L65 rebuild, 21A/7L65 and 21B/7L65 relay settings updates + end-to-end testing between 708s Grizzly Bear, 709s Vegreville, and 710s Vermillion 55.5 Hours
Continuous		  
19-Aug-26 11:00 20-Aug-26 16:00 ALTALINK TE 650s RTU/SCADA (650s Hansman Lake) RTU database update 29 Hours
Daily		  
20-Aug-26 07:00 26-Aug-26 20:00 ATCO, ALTALINK RB 939L (77s Sagitawah - 809s Louise Creek) line inspection on 9L939/38 157 Hours
Daily		  
20-Aug-26 07:00 26-Aug-26 17:00 ATCO, ALTALINK RB 938L (77s Sagitawah - 809s Louise Creek) line inspection 9L939/38 154 Hours
Daily		  
20-Aug-26 08:00 24-Aug-26 20:00 SUNCOR TE 29EDD-1 29EDD1s1152 (29EDD-1 Millennium), 29EDD-1 29EDD1s1552 (29EDD-1 Millennium) 29EDD-1 / N72B1 north bus PRC-005 / relay test 108 Hours
Continuous		  
20-Aug-26 08:00 21-Aug-26 16:00 ALTALINK TE 510s RTU/SCADA (510s Sunnybrook) split the existing SCADA VLAN from 1 to 1 and 2 32 Hours
Daily		  
20-Aug-26 08:00 26-Aug-26 19:00 ATCO, ALTALINK RB 9L939 (77s Sagitawah - 809s Louise Creek) line inspection on 9L939/38 131 Hours
Continuous		  
20-Aug-26 08:00 20-Aug-26 16:00 ENMAX Outage 33.2TR (SS-33) relays, lockout testing 8 Hours
Continuous		  
20-Aug-26 08:00 26-Aug-26 17:00 ATCO, ALTALINK RB 9L938 (77s Sagitawah - 809s Louise Creek) line inspection 9L939/38 129 Hours
Continuous		  
20-Aug-26 08:00 20-Aug-26 12:00 ENMAX TE 54.81L (SS-54 - SS-65) SS54 54.81L 'A' protection outage, L90 internal battery fail 4 Hours
Continuous		  
20-Aug-26 08:00 20-Aug-26 16:00 ENMAX RB 21.61L (SS-21 - SS-34) tree trimming 8 Hours
Continuous		  
20-Aug-26 08:00 20-Aug-26 16:00 ENMAX RB 15.62L (SS-15 - SS-16) tree trimming 8 Hours
Continuous		  
20-Aug-26 08:00 21-Aug-26 16:00 ALTALINK TE 305s RTU/SCADA (305s Acheson), AltaLink Telecom Equipment investigate power supply issue on radio which has caused the hop to fully lose it's redundancy 32 Hours
Continuous		  
20-Aug-26 09:00 20-Aug-26 16:00 ATCO TE ATCO Telecom Equipment Dover_T-Telecom/Mackay River_S-Telecom outage
 7 Hours
Continuous		  
20-Aug-26 09:00 09-Oct-26 10:00 ALTALINK Outage 58s T1 (58s Edson) 58s T1 transformer replacement and containment install 1,201 Hours
Continuous		  
21-Aug-26 08:00 21-Aug-26 16:00 ENMAX Outage 16.61L (SS-16 - SS-27), 16B69-16.61 (SS-16) breaker power factor test 8 Hours
Continuous		  
21-Aug-26 08:00 23-Aug-26 16:00 ALTALINK TE 72s RTU/SCADA (72s Leismer) split the existing SCADA VLAN from 1 to 1 and 2 56 Hours
Daily		  
21-Aug-26 08:00 21-Aug-26 16:00 ENMAX Outage 41.1C (SS-41), 41B138-41.1CAP (SS-41) internal battery fail alarm 8 Hours
Continuous		  
21-Aug-26 08:00 21-Aug-26 17:00 ATCO, ALTALINK, SHELL TE 402s Protection & Control (402s Scotford Expansion 1) urgent protection outage to troubleshoot air break status into protection and test B87/21/807L L90 relay to prevent mis-operation 9 Hours
Continuous		  
21-Aug-26 08:00 21-Aug-26 17:00 ALTALINK TE 233s Protection & Control (233s Beamer) urgent work to block protection on 807L B87/21/L1 URL90 for testing of protection logic to prevent mis-operation 9 Hours
Continuous		  
21-Aug-26 08:00 21-Aug-26 17:00 ALTALINK TE 410s Protection & Control (410s Josephburg) urgent work to block protection 807L B87/21/L7 URL90 for testing of protection logic to prevent mis-operation 9 Hours
Continuous		  
21-Aug-26 10:00 21-Aug-26 16:00 ATCO TE ATCO Telecom Equipment, 720s RTU/SCADA (720s Wabasca) swapping site networking to VPLS 11 6 Hours
Continuous		  
22-Aug-26 07:00 27-Aug-26 17:00 ALTALINK TE 77s RTU/SCADA (77s Sagitawah) RTU database update 130 Hours
Daily		  
22-Aug-26 08:00 22-Aug-26 12:00 ENMAX, ALTALINK Outage 21.80L (42s Sarcee - SS-21), 21B138-21.80 (SS-21), 42s 21 (42s Sarcee) HV breaker SF6 gas sample - 21B138-21.80 4 Hours
Continuous		  
22-Aug-26 08:00 22-Aug-26 12:00 ENMAX, ALTALINK IO 21.80L (42s Sarcee - SS-21) ENMAX Work - HV Breaker SF6 Gas Sample - 21B138-21.80 4 Hours
Continuous		  
22-Aug-26 08:00 28-Aug-26 16:00 ATCO IO ATCO RTU/SCADA EMSI upgrade on the SCADA system application at both the SOC and SOC2 locations 152 Hours
Continuous		  
22-Aug-26 08:00 22-Aug-26 12:00 ENMAX, ALTALINK IO 21.80L (42s Sarcee - SS-21) HV Breaker SF6 Gas Sample - 21B138-21.80 Y 4 Hours
Continuous		  
22-Aug-26 12:00 22-Aug-26 16:00 ENMAX, ALTALINK Outage 832L (SS-10 - SS-12), 10B138-832 (SS-10), 12B138-832L (SS-12) HV breaker 10B138-832L resample SF6 gas 4 Hours
Continuous		  
22-Aug-26 12:00 22-Aug-26 16:00 ENMAX, ALTALINK IO 832L (SS-10 - SS-12) HV Breaker 10B138-832L Resample SF6 Gas 4 Hours
Continuous		  
23-Aug-26 07:00 26-Aug-26 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) protection outage for trip testing 82 Hours
Daily		  
23-Aug-26 08:00 23-Aug-26 16:00 ENMAX Outage 13.60L (SS-13 - SS-27), 13.4TR (SS-13), 27B69-13.60 (SS-27), 13B69-13.60 (SS-13) Breaker Power Factor Test - 27B69-13.60 8 Hours
Continuous		  
24-Aug-26 06:30 24-Aug-26 12:30 ALTALINK Outage 77s 40 (77s Sagitawah) trip test 77s40 6 Hours
Daily		  
24-Aug-26 06:30 24-Aug-26 12:30 ATCO, ALTALINK RB 9L938 (77s Sagitawah - 809s Louise Creek) reclosing blocked for AltaLink's work on 77s40 6 Hours
Continuous		  
24-Aug-26 07:00 30-Aug-26 17:00 EPCOR Outage 557s T2 (557s Castle Downs), 557s CD2403 (557s Castle Downs), 557s CD2404 (557s Castle Downs), 557s CDAB2 (557s Castle Downs) Castledowns: TX2 tap changer and disconnect switch maintenance 154 Hours
Continuous		  
24-Aug-26 07:00 27-Aug-26 17:00 EPCOR Outage 72JM18 (EP 805s Jasper - Meadowlark), M721 (Meadowlark), EP 805s J722 (EP 805s Jasper) JM18/Meadowlark: SA Doble and MDS1 Disconnect Maintenance 82 Hours
Continuous		  
24-Aug-26 07:00 01-Sep-26 18:00 ALTALINK, BCH Outage Path 1 (AIES Islanding), 1201L (520s Bennett - BCH Cranbrook), 520s 552 (520s Bennett), 5L94 (BCH Cranbrook - 520s Bennett), 520s 12 (520s Bennett), 5D25 (BCH Cranbrook) South Crew will be doing Insulator and guy wire replacements 201 Hours
Continuous		 AB-BC
24-Aug-26 07:00 01-Sep-26 18:00 ALTALINK, BCH Outage 786L (799s Coleman - BCH Natal), 799s 786W (799s Coleman) opened because 1201L is out of service. 201 Hours
Continuous		 AB-BC
24-Aug-26 07:30 27-Aug-26 13:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) hop required for installing interphase spacers on 7L760 live line 78 Hours
Continuous		  
24-Aug-26 08:00 01-Sep-26 17:00 ALTALINK, BCH Outage 1L274 (BCH Natal - BCH Line Creek tap), 887L (48s Pocaterra - 978s BCH Britt Creek) opened because 1201L is out of service and BC needs this end open. 201 Hours
Continuous		 AB-BC
24-Aug-26 08:00 01-Sep-26 17:00 ALTALINK, BHE Outage MATL (120s Picture Butte - Montana) align with 1201L outage 201 Hours
Continuous		 AB-MATL
24-Aug-26 08:00 27-Aug-26 13:00 ATCO RB 7L760 (767s Oyen - 7LC760 tap) hop required for installing interphase spacers on 7L760 live line 77 Hours
Continuous		  
24-Aug-26 08:00 27-Aug-26 16:00 ALTALINK TE 227s RTU/SCADA (227s Cutting Lake) RTU outage for minor config changes to prep for HMI replacement. No loss of controls. Temporary alarms when minor changes are completed. Restored at the end of each day. 80 Hours
Daily		  
24-Aug-26 08:00 24-Aug-26 12:00 ENMAX Outage 162B138-RB83 (SS-162) HV breaker SF6 gas sample - 162B138-RB83. breaker dashpot checks 4 Hours
Continuous		  
24-Aug-26 08:00 25-Aug-26 16:00 ENMAX Outage 2.84L (SS-2 - SS-8) Cathodic protection installation 32 Hours
Continuous		  
24-Aug-26 08:00 27-Aug-26 16:00 ENMAX Outage 38.2TR (SS-38) 38.2TR 8kV bus Breaker Alignment 38B8-38.14, 38B8-38.15, 38B8-38.16, 38B8-38.2TR, 38B8-38TT2 80 Hours
Continuous		  
24-Aug-26 08:00 25-Aug-26 16:00 ENMAX TE Protection & Control (SS-36) 36 sub Autoswitching protection outage. Relay Protection Test - 36RLY138-36.ASW 32 Hours
Daily		  
24-Aug-26 08:00 25-Aug-26 16:00 ENMAX Outage 21.61L (SS-21 - SS-34), 34B69-21.61 (SS-34) 34B69-21.61 CT Terminal Block Replacement 32 Hours
Continuous		  
24-Aug-26 08:00 25-Aug-26 16:00 ENMAX TE Protection & Control (SS-34) 34sub Z21 69kV Bus differential protection outage. 34B69-21.61 CT Terminal Block Replacement. Fault clearing time 27.4 cycles. 32 Hours
Daily		  
24-Aug-26 08:00 24-Aug-26 17:00 ALTALINK, EPCOR Outage 700L (422s Westwood - 746L tap), 700L (746s Sherwood Park - 746L tap), 746L (700L tap - 746AL tap) Urgent, Isolate and ground 746L for High Load move. 9 Hours
Continuous		  
24-Aug-26 08:00 01-Sep-26 17:30 ALTALINK Outage 120s 240kV Bus 1 (120s Picture Butte) 120s MATL: Full Substation Outage, Equipment Maintenance 201.5 Hours
Continuous		  
24-Aug-26 08:00 27-Aug-26 16:00 ENMAX Outage 5.9TR (SS-5) Transformer Power Factor Test. Secondary Cable Test. Transformer Maintenance. Relay Fault Pressure Test. 80 Hours
Continuous		  
24-Aug-26 09:00 24-Aug-26 10:00 ATCO TE ATCO Telecom Equipment, 722s RTU/SCADA (722s Crystal Lake) Crystal Lake_S-Telecom - upgrading Crystal Lake 'A' SAR OS TO V21, then V22 1 Hour
Continuous		  
24-Aug-26 09:00 03-Sep-26 17:30 ALTALINK RB 1045AL (320p Keephills - 1045L tap), 1045L (310p Sundance - 1045AL tap) 1044L/1045L/1098L: Reclose Block for aerial washing program 248.5 Hours
Continuous		  
24-Aug-26 09:00 25-Aug-26 17:00 ALTALINK, EPCOR Outage 908AL (52S East Industrial - 908L tap), 908L (38s East Edmonton - 908AL tap), 908L (89s Ellerslie - 908AL tap), 52s T2 (52s East Industrial), 52s E2402 (52s East Industrial), 52s EDS2 (52s East Industrial) east industrial/908LW: CVT JB rewiring 32 Hours
Continuous		  
24-Aug-26 09:00 25-Aug-26 18:00 ALTALINK, EPCOR IO 908L (38s East Edmonton - 908AL tap), 908L (89s Ellerslie - 908AL tap), 908AL (52S East Industrial - 908L tap) east industrial/908LW: CVT JB Rewiring 33 Hours
Continuous		  
24-Aug-26 09:00 01-Sep-26 17:00 BCH Outage 5L92 (BCH Cranbrook - BCH Selkirk) replace spacers, markerballs and insulators 200 Hours
Continuous		 AB-BC
24-Aug-26 09:00 24-Aug-26 14:00 Saskpower Outage Sask Power AS905 maintenance 5 Hours
Continuous		 AB-SK
24-Aug-26 09:30 03-Sep-26 17:00 EPCOR, ALTALINK RB 1098L (EP 805s Jasper - Poundmaker), 1044L (EP 805s Jasper - 816s Petrolia), 1045L (EP 805s Jasper - 1045AL tap) 1044L/1045L/1098L: reclose block for aerial washing program 247.5 Hours
Continuous		  
24-Aug-26 09:30 24-Aug-26 10:59 ATCO Outage 2009s 703 (2009s Willow Lake) PRC-005 trip coil testing 1.48 Hours
Continuous		  
24-Aug-26 09:30 28-Aug-26 17:00 ALTALINK RB 792L (92s Viscount - 191s N.W. Cardiff) transmission line maintenance
103.5 Hours
Daily		  
24-Aug-26 09:30 25-Aug-26 17:30 ATCO TE 917s RTU/SCADA (917s Horse River), 917s Protection & Control (917s Horse River) alternate settings group installation (for closing 875s 700D1) on 7L38 protection both A and B

32 Hours
Continuous		  
24-Aug-26 09:30 24-Aug-26 16:00 ALTALINK TE 504s Protection & Control (504s Queenstown) Techs to complete PRC maintenance on the following redundant protections A & B 138B, 853L A & B L3, and 161L A & B L1 and the following non-redundant protections 876L 96/152, and 853L 96/352, One at a time.

6.5 Hours
Continuous		  
24-Aug-26 10:00 25-Aug-26 17:30 ATCO Outage 959s 703 (959s Lanfine) PRC-005 - trip coil testing 31.5 Hours
Continuous		  
24-Aug-26 10:00 24-Aug-26 12:59 SUNCOR Outage 29EDD-1 29EDD1s1152 (29EDD-1 Millennium) 29EDD-1 / N72B1 NORTH BUS PRC-005 / Relay Test - Trip Open 29EDD1s1152 (29EDD-1 Millennium) 450338060
In conjunction with outage 1-00529413		 2.98 Hours
Continuous		  
24-Aug-26 10:00 25-Aug-26 16:00 ATCO Outage 815s 705C (815s Goodfare) breaker SF6 HPL complete testing - 705 at 815s 30 Hours
Continuous		  
24-Aug-26 10:00 24-Aug-26 16:00 ATCO TE ATCO Telecom Equipment, 735s RTU/SCADA (735s Swan River) Swan River_T-Telecom. 7750-2 integration, swapping site networking to VPLS 11 6 Hours
Continuous		  
24-Aug-26 11:00 27-Aug-26 15:00 ATCO RB 7L85 (801s Anderson - ATC 803s Bullpound), 7L85 (803s ATC Bullpound - 7LA85 tap), 7L85 (804s Wintering Hills - 7LA85 tap) hop required for installing interphase spacers on 7L85 live line 76 Hours
Continuous		  
24-Aug-26 11:00 24-Aug-26 12:29 ATCO Outage 2009s 704 (2009s Willow Lake) PRC-005 trip coil testing 1.48 Hours
Continuous		  
24-Aug-26 11:00 27-Aug-26 17:00 ALTALINK Outage 883L (288s Wolf Creek - 429s Nelson Lake), 429s T1 (429s Nelson Lake), 429s 883W (429s Nelson Lake) transformer, regulator maint. doble, leak repairs, 429s8/13 cable cold shrink repair, 883L insulator replacement 78 Hours
Continuous		  
24-Aug-26 11:00 26-Aug-26 16:00 ATCO TE 738s RTU/SCADA (738s Virginia Hills) cut over the radio into the new building on Aug 25 from 10am-2pm 53 Hours
Continuous		  
24-Aug-26 11:00 24-Aug-26 16:00 ALTALINK TE 178s Protection & Control (178s Cynthia) standard relay maintenance, redundant protections in place at all times 5 Hours
Daily		  
24-Aug-26 12:00 25-Aug-26 16:00 ATCO TE ATCO Telecom Equipment capacity and reliability upgrades
28 Hours
Continuous		  
24-Aug-26 12:00 26-Aug-26 17:00 ALTALINK Outage 677L (305s Acheson - 595s Spruce Grove), 305s 677 (305s Acheson), 595s 677 (595s Spruce Grove) PRC5 major breaker maintenance 53 Hours
Continuous		  
24-Aug-26 12:00 24-Aug-26 16:00 ENMAX Outage 47B138-BT3 (SS-47) HV Breaker SF6 Gas Sample - 47B138-BT3 4 Hours
Continuous		  
24-Aug-26 12:30 24-Aug-26 13:59 ATCO Outage 2009s 707 (2009s Willow Lake) PRC-005 trip coil testing 1.48 Hours
Continuous		  
24-Aug-26 12:31 24-Aug-26 18:00 ALTALINK Outage 77s 57 (77s Sagitawah) trip test 77s57 5.48 Hours
Daily		  
24-Aug-26 12:31 24-Aug-26 18:00 ATCO, ALTALINK RB 9L939 (77s Sagitawah - 809s Louise Creek) reclosing blocked for AltaLink's work on 77s57 5.48 Hours
Continuous		  
24-Aug-26 13:00 28-Aug-26 17:00 ALTALINK Outage 28s R1 (28s West Brooks) 28sR1 leak category 5, doble R1, 28s44 PRC5 (no first trip) 100 Hours
Continuous		  
24-Aug-26 13:00 04-Sep-26 13:00 ATCO Outage 7L228 (845s Big Mountain - 7L20 tap), 7L20 (740s H.R. Milner - 810s Dome Cutbank), 740s 704 (740s H.R. Milner), 7L20D3 (810s Dome Cutbank) 7L228D2 line switch failure replacement, install BKR 703 264 Hours
Continuous		  
24-Aug-26 13:00 24-Aug-26 16:00 SUNCOR Outage 29EDD-1 29EDD1s1552 (29EDD-1 Millennium) 29EDD-1 / N72B1 NORTH BUS PRC-005 / Relay Test - Trip Open 29EDD1s1552 (29EDD-1 Millennium) 450338060
In conjunction with outage 1-00529413 and following outage 1-00529415		 3 Hours
Continuous		  
24-Aug-26 13:00 24-Aug-26 14:00 ATCO TE ATCO Telecom Equipment upgrading ELK point 'A' SAR OS TO V21, then V22
1 Hour
Continuous		  
24-Aug-26 13:00 04-Sep-26 13:00 ATCO TE 2091s Protection & Control (2091s Thornton), 2091s RTU/SCADA (2091s Thornton) wiring and updating 21A & 21B 7L228 relays and settings, station controller and settings 264 Hours
Continuous		  
24-Aug-26 14:00 24-Aug-26 15:29 ATCO Outage 2009s 708 (2009s Willow Lake) PRC-005 trip coil testing 1.48 Hours
Continuous		  
25-Aug-26 07:00 27-Aug-26 17:00 ALTALINK IO 77s 37 (77s Sagitawah) test the functionality of clearing the 240kV East Bus by simulating opening 77s37 as part of clearing the bus
58 Hours
Daily		  
25-Aug-26 07:00 21-Sep-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 21A/7L55 for relay testing and wiring, element will be out of service under GOI 2-81723 658 Hours
Continuous		  
25-Aug-26 08:00 25-Aug-26 18:00 ATCO Outage 743s 144kV Bus 700BS1 (743s Sarah Lake), 7L55 (743s Sarah Lake - 809s Louise Creek), 7L172 (739s Edith Lake - 743s Sarah Lake), 743s 701T (743s Sarah Lake), 743s 701 (743s Sarah Lake), 743s 704 (743s Sarah Lake), 743s 705 (743s Sarah Lake), 743s 605 (743s Sarah Lake), 743s 501 (743s Sarah Lake) create jumper J1 - upper bus to lower bus connection, remove OHSW 10 Hours
Continuous		  
25-Aug-26 08:00 06-Sep-26 16:00 Syncrude Outage T3 (Aurora), 11 (Aurora), 12 (Aurora), G20 (Aurora), 89-15 (Aurora) outage to repair damaged 15kV bus ducting. 296 Hours
Continuous		  
25-Aug-26 08:00 21-Sep-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 21B/7L55 for relay testing and wiring, element will be out of service under GOI 2-81723 657 Hours
Continuous		  
25-Aug-26 08:00 21-Sep-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 86-50BF-1/700BS1, 94-50BF-1/700BS1 657 Hours
Continuous		  
25-Aug-26 08:00 21-Sep-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 50BF/701 for relay testing 657 Hours
Continuous		  
25-Aug-26 08:00 25-Aug-26 16:00 ALTALINK TE 275s RTU/SCADA (275s Jenner) Techs to make changes to IRIG circuits to try and fix an ongoing SUB_CLOCK_TROUBLE alarms 8 Hours
Continuous		  
25-Aug-26 08:00 26-Aug-26 16:00 ALTALINK TE 217s Protection & Control (217s North Red Deer) PRC maintenance 32 Hours
Continuous		  
25-Aug-26 08:00 25-Aug-26 16:00 ALTALINK TE 520s RTU/SCADA (520s Bennett) to add the supervisory status/control for 1201L (L3) RAS 8 Hours
Continuous		 AB-BC
25-Aug-26 08:00 25-Aug-26 16:00 ALTALINK TE 520s Protection & Control (520s Bennett) enable supervisory control and indication for 1201L Selkirk RAS (B protection) 8 Hours
Continuous		 AB-BC
25-Aug-26 08:00 25-Aug-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 651s RTU/SCADA (651s Kirby) MPLS 7705A firmware upgrade
8 Hours
Daily		  
25-Aug-26 08:00 25-Aug-26 16:00 ALTALINK TE 21s RTU/SCADA (21s Marion) RTU SMP4 replacement 8 Hours
Continuous		  
25-Aug-26 08:00 25-Aug-26 12:00 ENMAX Outage 65B138-D85 (SS-65) HV breaker SF6 gas sample 4 Hours
Continuous		  
25-Aug-26 09:00 26-Aug-26 17:00 ATCO TE ATCO Telecom Equipment MPLS Life Cycle upgrades to SAR A

32 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 11:00 ATCO TE ATCO Telecom Equipment, 845s RTU/SCADA (845s Big Mountain), 808s RTU/SCADA (808s Procter & Gamble), 749s Flyingshot Lake RTU/SCADA
SAR Upgrade at Big Mtn and Flying Shot
2 SEPARATE OUTAGES:
1st Outage
845S SCADA
7L45 21 A&B 845S/813S
7L46 21 A&B 845S/813S
7L33 A&B 845S/749S
7L44 A&B 845S/749S
7L228 A&B 845S/2091S
2nd
749S SCADA
7L44 A&B 845S/749S
7L33 A&B 845S/749S
7L84 A&B 749S/722S		 2 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 18:00 ATCO RB 7L09 (823s Wapiti - 7L03 tap) repairing downhaul insulator on 7L09-111 9 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 777s Protection & Control (777s Vilna) relay settings changes and station control file updates 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 763s RTU/SCADA (763s Hanna) changing the password on 1 ION meter 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 768s RTU/SCADA (768s Rowley) changing the password on 1 ION meter 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 772s RTU/SCADA (772s Youngstown) changing the password on 1 ION meter 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 801s RTU/SCADA (801s Anderson) changing the password on 1 ION meter 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE ATC 803s RTU/SCADA (ATC 803s Bullpound) changing the password on 1 ION meter 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 804s RTU/SCADA (804s Wintering Hills) changing the password on 1 ION meter 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 914s RTU/SCADA (914s Bindloss) changing the password on 1 ION meter 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 959s RTU/SCADA (959s Lanfine) changing the password on 2 ION meters 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 963s RTU/SCADA (963s Coyote Lake) changing the password on 2 ION meters 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 910s RTU/SCADA (910s Excel) changing the password on 1 ION meter 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 802s RTU/SCADA (802s Michichi Creek) changing the password on 1 ION meter 8 Hours
Continuous		  
25-Aug-26 09:00 25-Aug-26 17:00 ATCO TE 893s RTU/SCADA (893s Cavendish) changing the password on 1 ION meter 8 Hours
Continuous		  
25-Aug-26 09:30 25-Aug-26 10:59 ATCO Outage 917s 703C (917s Horse River) PRC-005 trip coil testing 1.48 Hours
Continuous		  
25-Aug-26 11:00 25-Aug-26 12:29 ATCO Outage 7L38 (875s Algar - 917s Horse River), 917s 704 (917s Horse River), 875s 701 (875s Algar) PRC-005 trip coil testing 1.48 Hours
Continuous		  
25-Aug-26 11:00 25-Aug-26 12:00 ATCO TE ATCO Telecom Equipment UPGRADING BRIDGE CREEK NET 1 SAR TO V21, THEN V22
IMPACT TO THE FOLLOWING TRAFFIC FOR UP TO 1 HOUR:
SUPCP010 - BRIDGE CREEK SUB SCADA
TPRCP082 / 7L33 A&B - BIG MOUNTAIN / FLYINGSHOT
TPRCP083 / 7LA33 A&B - BIG MOUNTAIN / CANADIAN HYDRO		 1 Hour
Continuous		  
25-Aug-26 11:00 25-Aug-26 18:00 ALTALINK Outage 77s 29 (77s Sagitawah) trip test 77s29 6 Hours
Daily		  
25-Aug-26 12:30 25-Aug-26 13:59 ATCO Outage 7L121 (917s Horse River - 7LA121 tap), 917s 705 (917s Horse River) PRC-005 trip coil testing 1.48 Hours
Continuous		  
25-Aug-26 13:00 25-Aug-26 14:00 ATCO TE ATCO Telecom Equipment upgrading touchwood 'A' SAR OS to V21 then V22 1 Hour
Continuous		  
25-Aug-26 13:00 25-Aug-26 17:00 ATCO TE ATCO Telecom Equipment Big Mountain_S/Bridge Creek_S-Telecom- IRU Radio Major PM
Impact to the following:
TPRCP082 / 7L33 A
TPRCP085 / 7L33 B
TPRCP080 / 7LA33 B
TPRCP083 / 7LA33 A		 4 Hours
Continuous		  
25-Aug-26 14:00 25-Aug-26 15:29 ATCO Outage 917s 706C (917s Horse River) PRC-005 trip coil testing 1.48 Hours
Continuous		  
26-Aug-26 06:30 26-Aug-26 13:00 ALTALINK Outage 77s 652 (77s Sagitawah) trip test 77s652 6.5 Hours
Daily		  
26-Aug-26 07:00 30-Aug-26 17:00 EPCOR Outage 52s T1 (52s East Industrial), 52s E2401 (52s East Industrial), 52s EDS1 (52s East Industrial) East Industrial: TX1 doble 106 Hours
Continuous		  
26-Aug-26 07:00 26-Aug-26 17:00 EPCOR Outage RW727 (Rossdale), 72RW3 (Rossdale - Woodcroft) Rossdale: RW727 repair 10 Hours
Continuous		  
26-Aug-26 08:00 26-Aug-26 16:00 ALTALINK, TRANSALTA TE 229s RTU/SCADA (229s Glenwood), 502s RTU/SCADA (502s Shell Waterton (#2)), AltaLink RTU/SCADA (AltaLink), AltaLink Telecom Equipment 9232R BVL to 502s/229s MDS Radio Maintenance. loss of 9232R, 502s & 229s supervisory for 4 hours (visibility loss)
8 Hours
Continuous		  
26-Aug-26 08:00 30-Aug-26 20:00 SUNCOR TE 29EDD-1 29EDD1s952 (29EDD-1 Millennium), 29EDD-1 29EDD1s752 (29EDD-1 Millennium) 29EDD1 / N260B2 north bus PRC-005 relay testing - 450338056
this will be done under protection, isolation and ring bus breakers will be opened one at a time to keep T2 online		 108 Hours
Continuous		  
26-Aug-26 08:00 26-Aug-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D83 protection outage 8 Hours
Continuous		  
26-Aug-26 08:00 27-Aug-26 18:00 ENMAX Outage 33.2TR (SS-33), 33MD138-33.2TR (SS-33) 33.2TR CT terminal block replacement 34 Hours
Continuous		  
26-Aug-26 08:00 27-Aug-26 18:00 ENMAX TE Protection & Control (SS-33) 33sub Z31 138kVbus differential protection outage. 33.2TR CT terminal block replacement. fault clearing time 26.5 cycles 34 Hours
Daily		  
26-Aug-26 08:00 04-Sep-26 16:00 ALTALINK TE 103s RTU/SCADA (103s Goose Lake) HMI replacement 224 Hours
Daily		  
26-Aug-26 08:00 26-Aug-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 72s RTU/SCADA (72s Leismer) MPLS firmware upgrade 8 Hours
Daily		  
26-Aug-26 08:30 27-Aug-26 16:00 ALTALINK TE 324s Protection & Control (324s Cassils) firmware update/protection testing on 1087L A87/21/L10 URL90 31.5 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 11:00 ATCO TE ATCO Telecom Equipment, 800s RTU/SCADA (800s Friedenstal) UPGRADING FAIRVIEW 'A' AND FRIEDENSTAL 'A' SARS TO V21, THEN V22
IMPACT TO THE FOLLOWING TRAFFIC FOR UP TO 90 MINS:
FRIEDENSTAL SUB SCADA
7L75 RAS A&B - FRIEDENSTAL / KSITUAN
7L73 RAS A&B - FRIEDENSTAL / KSITUAN
7L73 A&B - FRIEDENSTAL / RYCROFT
7L75 A&B - WEST PEACE / FRIEDENSTAL
 2 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ATCO TE 757s RTU/SCADA (757s Battle River) changing the password on 2 ION meters 8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ATCO TE 764s RTU/SCADA (764s Heisler) changing the password on 2 ION meters
8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ATCO TE 769s RTU/SCADA (769s Stettler) changing the password on 2 ION meters 8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ATCO TE 771s RTU/SCADA (771s Veteran) changing the password on 1 ION meter 8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ATCO TE 774s RTU/SCADA (774s Monitor) changing the password on 2 ION meters 8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ATCO TE 778s RTU/SCADA (778s Big Valley) changing the password on 1 ION mete
8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ATCO TE 892s RTU/SCADA (892s Ribstone Creek) changing the password on 1 ION meter 8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ATCO TE 903s RTU/SCADA (903s Loyalist) changing the password on 1 ION meter 8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ATCO TE 932s RTU/SCADA (932s Pemukan) changing the password on 2 ION meters 8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ATCO TE 948s RTU/SCADA (948s Heatburg) changing the password on 1 ION meter 8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ALTALINK TE 520s Protection & Control (520s Bennett) CBK 5L94 / 1201L PYPN OOS, CBK 5L94 / 1201L SYPN OOS, for breaker trip testing of 5CB21 and 5CB23 associated with 8-01399566.
5L94/1201L will be out of service from Aug 24 to Sept
8 Hours
Continuous		  
26-Aug-26 09:00 26-Aug-26 17:00 ALTALINK, BCH TE 5L94 (BCH Cranbrook - 520s Bennett) BPA annual RAS test and 5CB21 and 5CB23 breaker trip test
8 Hours
Continuous		 AB-BC
26-Aug-26 09:30 27-Aug-26 16:00 ATCO Outage 856s 706 (856s Kinosis) PRC-005 trip coil testing, breaker maintenance 30.5 Hours
Continuous		  
26-Aug-26 09:30 27-Aug-26 17:30 ATCO TE 2011s RTU/SCADA (2011s Dawes) Alternate settings group installation (for closing 875s 700D1) on 7L170 protection, both A and B. One relay to be updated at a time. Backup protection to remain in service. SCADA update to add alarming for alternate settings groups. Will lose visibility for 5-10 minutes during restarts
32 Hours
Continuous		  
26-Aug-26 09:30 27-Aug-26 16:00 ATCO TE ATCO Telecom Equipment Capacity & Reliability upgrades. IMPACT TO THE FOLLOWING TRAFFIC FOR DURATION OF OUTAGE:
TPRCP019 / 9L930 B
TPRCP134 / 7L114 DTT CH FAIL
TPRFF124 / 9L45 A
TPRFF125 / 9L45 B
TPRCP221 / 9L55 & 1085L A
TPRCP222 / 9L55 & 1085L B		 30.5 Hours
Continuous		  
26-Aug-26 10:00 27-Aug-26 17:30 ATCO Outage 959s 702 (959s Lanfine) breaker SF6 GL312 testing - 702 @ 959s
prc-005 - trip coil testing - breaker 702 @ 959s
31.5 Hours
Continuous		  
26-Aug-26 10:00 27-Aug-26 16:00 ATCO Outage 815s 706 (815s Goodfare), 815s 706C (815s Goodfare) breaker SF6 HPL complete testing - 706 @ 815s 30 Hours
Continuous		  
26-Aug-26 12:00 21-Sep-26 11:00 ATCO Outage 743s 701 (743s Sarah Lake), 743s 701A (743s Sarah Lake), 743s 7L55D3 (743s Sarah Lake), 7L55 (743s Sarah Lake - 809s Louise Creek) 743s Sarah lake rebuild 623 Hours
Continuous		  
26-Aug-26 14:00 01-Sep-26 18:00 SUNCOR Outage 29EDD-85 29PS-322 (29EDD-85), 29EDD-85 29PS-421 (29EDD-85), 29EDD-85 29PS-422 (29EDD-85), 29EDD-85 752-10010 (29EDD-85), 29EDD-85 752-10020 (29EDD-85) Firebag: 29EDD85;29PP-100A SYSTEM;PM 12Y, Testing on 29PT-424A/B/C, 29PS-421, 29PS-422, 29PS-322, 29PLA-110A/B/C,29PP-100A, associated PRC-5 testing 148 Hours
Continuous		  
27-Aug-26 07:00 27-Aug-26 11:30 EPCOR Outage 987s CC721 (987s Clover Bar), 987s T2 (987s Clover Bar) bus diff upgrade cutovers 4.5 Hours
Continuous		  
27-Aug-26 07:00 27-Aug-26 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) breaker fail protection outage for trip testing (77s752) 10 Hours
Daily		  
27-Aug-26 07:00 27-Aug-26 18:00 ALTALINK Outage 77s 452 (77s Sagitawah) trip test 77s452 11 Hours
Daily		  
27-Aug-26 07:30 28-Aug-26 19:30 ATCO, ALTALINK RB 913L (69s North Barrhead - 732s Mitsue) Installing marker cones on 9L913 at span 503. 36 Hours
Continuous		  
27-Aug-26 08:00 28-Aug-26 19:00 ATCO, ALTALINK RB 9L913 (69s North Barrhead - 732s Mitsue) installing marker cones 35 Hours
Continuous		  
27-Aug-26 08:00 27-Aug-26 12:00 ENMAX TE Protection & Control (SS-162) bus differential protection outage 4 Hours
Continuous		  
27-Aug-26 08:00 27-Aug-26 16:00 ENMAX Outage 2.80L (SS-2 - SS-23), 23B138-2.80 (SS-23) heater circuit contactor/ETS relay upgrades 8 Hours
Continuous		  
27-Aug-26 08:00 30-Aug-26 16:00 ALTALINK TE 388s RTU/SCADA (388s Riverside) to update the D20 RTU configuration to accommodate the customer DCS upgrade 80 Hours
Daily		  
27-Aug-26 08:00 01-Sep-26 18:00 SUNCOR Outage 635EDD-1000 635-752-113 (635EDD-1000), 635EDD-1000 635PT-1004 (635EDD-1000), 635EDD-1000 635PS-1037 (635EDD-1000) planned maintenance of diameter 1 130 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 11:00 ATCO TE ATCO Telecom Equipment, 741s RTU/SCADA (741s Fox Creek), 2018s RTU/SCADA (2018s Muir), APS# 218 Fox Creek 741S-7L90 Overload Mitigation Scheme upgrade tower 2 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 848s RTU/SCADA (848s Ruth Lake) Changing the password on 3 ION Meters. The meters provide the substation 605T LV MW, 605T LV MVAR, , 606T LV MW, 606T LV MVAR, 703T TERTIARY MW, 703T TERTIARY MVAR, 704T TERTIARY MW and 704T TERTIARY MVAR analog values to AESO. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 907s RTU/SCADA (907s Waddell) Changing the password on 2 ION Meters. The meters provide the substation 500PT1 KV, 701T MW, 701T MVAR and FREQUENCY analog values to AESO. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 856s RTU/SCADA (856s Kinosis) Changing the password on 4 ION Meters. The meters provide the substation FREQUENCY, 902T MW, 902T MVAR, 903T HV MW, 903T HV MVAR, 903T HV KV and 903T LV KV analog values to AESO. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 860s RTU/SCADA (860s Crow) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 875s RTU/SCADA (875s Algar) Changing the password on 2 ION Meters. The meters provide analog values to TOC. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 888s RTU/SCADA (888s Dover) Changing the password on 1 ION Meter. The meter provides the substation 919C MVAR and 919C KV analog values to AESO. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 917s RTU/SCADA (917s Horse River) Changing the password on 1 ION Meter. The meter provides the substation FREQUENCY analog values to AESO. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 925s RTU/SCADA (925s Green Stocking) Changing the password on 2 ION Meters. The meters provide the substation analog values to TOC. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 931s RTU/SCADA (931s Bohn) Changing the password on 2 ION Meters. The meters provide the substation FREQUENCY analog values to AESO. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 933s RTU/SCADA (933s Tower Road) Changing the password on 1 ION Meter. The meter provides analog values to TOC. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 977s RTU/SCADA (977s Salt Creek) Changing the password on 1 ION Meter. The meter provides the substation 901T 240 MW, 901T 240 MVAR and 900PT1 KV analog values to AESO. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 989s RTU/SCADA (989s Quigley) Changing the password on 1 ION Meter. The meter provides analog values to TOC. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 10:00 27-Aug-26 16:00 ATCO TE ATCO Telecom Equipment Triangle_S-Telecomm 7750-2 Integration. Swapping site networking to VPLS 11. 882S RTU Scada outage during switch update will lose visibility for up to 2 hours. 6 Hours
Continuous		  
27-Aug-26 12:00 27-Aug-26 16:00 ENMAX TE 162.4TR (SS-162) 162.4TR 'A' Protection outage. I&R Internal Battery Fail on Relay T60 162.4TR at 162 Sub 4 Hours
Continuous		  
27-Aug-26 23:00 28-Aug-26 05:00 EPCOR Outage EP 511s Victoria T3 (EP 511s Victoria), EP 511s Victoria T4 (EP 511s Victoria), EP 511s V724 (EP 511s Victoria), EP 511s V725 (EP 511s Victoria), EP 511s V726 (EP 511s Victoria) Victoria: TX3/TX4 Zone. Light Standard Removal for Emergency TX3 Replacement Project 6 Hours
Continuous		  
28-Aug-26 08:00 28-Aug-26 18:00 ENMAX Outage 240kV South Bus (SS-162), 138kV South Bus (SS-162), 162.2TR (SS-162), 162B240-RB133 (SS-162), 162B240-RB136 (SS-162), 162MD240-162.2TR (SS-162), 162B138-RB83 (SS-162), 162B138-RB84 (SS-162), 162B138-RB92 (SS-162), 162MD138-162.2TR (SS-162) summer substation washing 10 Hours
Continuous		  
28-Aug-26 08:00 28-Aug-26 19:00 ATCO Outage 7L90 (741s ATC Fox Creek - 7LA90 tap) Installing starclamps on conductor of 7L90 between D3 and D4 at several locations on Tx line 11 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 10:00 ATCO TE ATCO Telecom Equipment rebuilding to optimize the Mitsue / Louise Creek LSP and paths
IMPACT TO TPRCP108 / 9L40 A - LOUISE CREEK / MITSUE
Redundant protection in Place		 1 Hour
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2011s RTU/SCADA (2011s Dawes) changing the password on 2 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2014s RTU/SCADA (2014s Halfway) changing the password on 2 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2015s RTU/SCADA (2015s Yeo) changing the password on 2 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2032s RTU/SCADA (2032s Sweetheart Lake) changing the password on 1 ION meter 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2049s RTU/SCADA (2049s Kettle River) changing the password on 4 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2060s RTU/SCADA (2060s Engstrom) changing the password on 4 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2081s RTU/SCADA (2081s Meadow Creek) changing the password on 1 ION meter 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2082s RTU/SCADA (2082s Dog Rib) changing the password on 1 ION meter 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 718s RTU/SCADA (718s Parsons Creek) changing the password on 2 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 820s RTU/SCADA (820s Hangingstone) changing the password on 2 ION meters 8 Hours
Continuous		  

Prepared On:   2026-08-19   16:01:08

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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