Alberta Electric System Operator
System Co-ordination Plan
2026-07-01 to 2026-07-10
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 17,646 Hours
Continuous		  
20-Mar-25 08:00 31-Jul-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 11,961 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		  
12-Jan-26 07:00 03-Jul-26 17:00 EPCOR TE 330p Protection & Control (330p Genesee) protect blocking, annual relay maintenance and password changes 4,137 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		  
03-Feb-26 09:00 09-Jul-26 17:00 ATCO TE 972s RTU/SCADA (972s Tinchebray) config changes needed throughout the CETO project 3,751 Hours
Continuous		  
09-Feb-26 09:00 09-Jul-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) block all 50BF protection until cutovers and associated commissioning are complete 3,607 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 31-Jul-26 16:00 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 3,410.25 Hours
Continuous		  
25-Apr-26 08:00 01-Jul-26 16:00 ENMAX Outage 1.82L (SS-1 - SS-5), 5B138-1.82 (SS-5), 1MD138-1.82 (SS-1) 1 sub Transmission line cut over 1,520 Hours
Continuous		  
25-Apr-26 08:00 01-Jul-26 16:00 ENMAX Outage 1.84L (SS-1 - SS-5), 5B138-1.84 (SS-5), 1MD138-1.84 (SS-1) 1 sub Transmission line cut over 1,520 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 28-Aug-26 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) protection blocking - relay maintenance and bus differential upgrade project 2,434 Hours
Continuous		  
26-May-26 09:30 15-Jul-26 16:30 ALTALINK Outage 157s C1 (157s Lac La Biche) trip test (157s852) 1,207 Hours
Continuous		  
27-May-26 18:00 31-Jul-26 17:00 ALTALINK Outage 526s C1 (526s Buffalo Creek) forced outage 1,559 Hours
Daily		  
01-Jun-26 09:00 16-Jul-26 17:30 ATCO TE 865s RTU/SCADA (865s Saddlehills) updating RTU/station controller configuration during SCADA upgrade project 1,088.5 Hours
Continuous		  
02-Jun-26 10:00 13-Jul-26 16:00 ATCO Outage 743s 701T (743s Sarah Lake), 743s 705 (743s Sarah Lake), 743s 605 (743s Sarah Lake), 743s 501 (743s Sarah Lake) 743S Sarah lake rebuild 990 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 30-Oct-26 17:00 EPCOR TE EP 511s Protection & Control (EP 511s Victoria) 72kV breaker fail protection blocking 2,626 Hours
Continuous		  
08-Jun-26 08:00 02-Jul-26 16:00 ENMAX Outage 37.2TR (SS-37) maintenance 440 Hours
Continuous		  
09-Jun-26 07:00 13-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 826.5 Hours
Continuous		  
09-Jun-26 07:00 14-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 50BF/705 for relay testing 178.5 Hours
Continuous		  
09-Jun-26 07:00 14-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 50BF/605 for relay testing 178.5 Hours
Continuous		  
15-Jun-26 07:00 24-Jul-26 17:00 EPCOR Outage EP 805s J2403 (EP 805s Jasper) J2403 replacement LCR 946 Hours
Continuous		  
15-Jun-26 07:00 04-Sep-26 17:00 EPCOR TE 805s Protection & Control (805s Jasper) protection blocking, breaker replacement project 1,954 Hours
Continuous		  
15-Jun-26 07:00 13-Jul-26 17:00 EPCOR Outage 72JM18 (EP 805s Jasper - Meadowlark), M721 (Meadowlark), M722 (Meadowlark), EP 805s J722 (EP 805s Jasper), T1 (Meadowlark), MAB1 (Meadowlark) Meadowlark: TX1 Zone, LCR Civil Work 274 Hours
Continuous		  
15-Jun-26 08:00 03-Jul-26 16:00 ALTALINK TE 254s RTU/SCADA (254s Coaldale) RTU replacement 440 Hours
Daily		  
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		  
22-Jun-26 07:00 03-Jul-26 17:00 ALTALINK, EPCOR TE 947L (89s Ellerslie - 987s Clover Bar) protection blocking, MPLS upgrade cutover and commissioning 274 Hours
Continuous		  
22-Jun-26 07:00 03-Jul-26 17:00 ALTALINK, EPCOR TE 915L (38s East Edmonton - 987s Clover Bar) protection blocking, MPLS upgrade cutover and commissioning 274 Hours
Continuous		  
22-Jun-26 08:00 03-Jul-26 16:00 ALTALINK IO 89s Protection & Control (89s Ellerslie) relay testing and cutover, protection blocking, MPLS upgrade cutover and commissioning 272 Hours
Continuous		  
22-Jun-26 08:00 03-Jul-26 16:00 ALTALINK IO 38s Protection & Control (38s East Edmonton) 915L (38s East Edmonton-987s Clover Bar): relay testing and cutover, protection blocking, MPLS upgrade cutover and commissioning 272 Hours
Continuous		  
22-Jun-26 09:00 05-Jul-26 20:00 SUNCOR Outage 29EDD-34 29PT-340 (29EDD-34), 29EDD-34 29-952-132 (29EDD-34), 29EDD-34 29-952-133 (29EDD-34), 29EDD-34 29-652-10201 (29EDD-34), 29EDD-34 29-652-10202 (29EDD-34), 29EDD-34 29-652-10203 (29EDD-34), 29EDD-34 29-652-10200T (29EDD-34) 29EDD34;29PT-340 SYSTEM;PM 5y,10y; 29EDD34;29PP-102 SYSTEM;PM 5y,10y
 323 Hours
Continuous		  
22-Jun-26 12:00 10-Jul-26 12:00 ATCO TE 791s RTU/SCADA (791s Rainbow Lake), 791s Protection & Control (791s Rainbow Lake) 701CT testing for breaker repair 432 Hours
Continuous		  
23-Jun-26 08:00 05-Jul-26 16:00 Syncrude Outage UT1 (Aurora), 12 (Aurora), 13 (Aurora) 6yr PM 296 Hours
Continuous		  
23-Jun-26 10:00 13-Jul-26 17:00 ATCO Outage 743s 701T (743s Sarah Lake) 743S Sarah Lake rebuild - replace 501A solid blade switches, replace surge arrestors 507, 508 487 Hours
Continuous		  
25-Jun-26 07:00 10-Jul-26 17:00 ALTALINK, EPCOR Outage 1044L (EP 805s Jasper - 816s Petrolia), EP 805s J2404 (EP 805s Jasper), EP 805s J2408 (EP 805s Jasper), 805s C1 (805s Jasper), EP 805s J2403 (EP 805s Jasper) J2403 replacement LCR 370 Hours
Continuous		  
29-Jun-26 07:00 10-Jul-26 17:00 ALTALINK, EPCOR TE 921L (71s Lamoureux - 987s Clover Bar) protection blocking for MPLS upgrade, cutover and commissioning 274 Hours
Continuous		  
29-Jun-26 08:00 10-Jul-26 16:00 ALTALINK IO 71s Protection & Control (71s Lamoureux) EPCOR MPLS TPR re-arrangements project 272 Hours
Continuous		  
29-Jun-26 09:15 02-Jul-26 17:45 ALTALINK Outage 726L (37s North Calder - 71s Lamoureux), 37s 726E (37s North Calder) transmission line maintenance 80.5 Hours
Continuous		  
29-Jun-26 10:00 24-Jul-26 17:30 ATCO TE 763s RTU/SCADA (763s Hanna) 602T ITM replacement
, SCADA updates required as part of ITM replacement project		 439.5 Hours
Continuous		  
30-Jun-26 07:30 02-Jul-26 17:30 ALTALINK TE 618s RTU/SCADA (618s Riverbend) RTU configuration update to remove alarms originating from the demod JMUX device.

58 Hours
Daily		  
30-Jun-26 11:00 31-Jul-26 17:00 EPCOR Outage 987s GT3 (987s Clover Bar), 987s CGB3 (987s Clover Bar) forced outage due to SF6 leak 750 Hours
Continuous		  
01-Jul-26 08:00 01-Jul-26 18:00 ENMAX Outage 162.1TR (SS-162), 240kV North Bus (SS-162), 138kV North Bus (SS-162), 162B138-RB80 (SS-162), 162B138-RB86 (SS-162), 162B138-RB94 (SS-162), 162B240-RB131 (SS-162), 162B240-RB134 (SS-162), 162MD138-162.1TR (SS-162), 162MD240-162.1TR (SS-162) summer substation washing 10 Hours
Continuous		  
02-Jul-26 07:00 15-Jul-26 17:00 EPCOR Outage 72LS24 (EP 803s Lambton - Strathcona), S724 (Strathcona), SDS10 (Strathcona) pole 322 Hours
Continuous		  
02-Jul-26 07:00 02-Jul-26 18:00 ALTALINK, TRANSALTA RB 138s 2152 (138s Windy Flats), 608AL (528s Blue Trail Wind Farm - 608L tap), 608L (418s Ardenville - 608L tap), 608L (138s Windy Flats - 608L tap) str 34, replace damper left phase 11 Hours
Continuous		  
02-Jul-26 08:00 02-Jul-26 17:00 ALTALINK TE AltaLink Telecom Equipment firmware upgrade on MPLS nodes A and B, firewall upgrade 9 Hours
Continuous		  
02-Jul-26 08:00 02-Jul-26 09:59 ATCO Outage 826s 701 (826s Marguerite Lake), 826s 701A (826s Marguerite Lake) breaker maintenance 1.98 Hours
Continuous		  
02-Jul-26 08:00 02-Jul-26 10:00 ENMAX Outage 2.82L (SS-2 - SS-5), 5B138-2.82 (SS-5), 2MD138-2.82 (SS-2) 1 sub transmission line cut over and commissioning 2 Hours
Continuous		  
02-Jul-26 08:00 02-Jul-26 17:00 ATCO Outage 839s 701T (839s Daishowa), 839s 701 (839s Daishowa) replace station service secondary conductors at 839s Daishowa
PRC-005 - spr testing - transformer 701T @ 839s
PRC-005 - trip coil testing - breaker 701 @ 839s
9 Hours
Continuous		  
02-Jul-26 08:00 02-Jul-26 18:00 ALTALINK, EPCOR RB 920L (37s North Calder - 557s Castle Downs), 920L (71s Lamoureux - 557s Castle Downs) safety requirement regarding 726L 10 Hours
Continuous		  
02-Jul-26 08:00 02-Jul-26 16:00 ALTALINK TE 254s RTU/SCADA (254s Coaldale) SCADA outage to commission new alarm points associated with T1 TC 8 Hours
Continuous		  
02-Jul-26 08:00 02-Jul-26 12:00 ENMAX Outage 16.60L (SS-16 - SS-34) relay settings changes to 16.60L at 34 sub 4 Hours
Continuous		  
02-Jul-26 08:00 03-Jul-26 17:30 ATCO TE 865s Protection & Control (865s Saddlehills) block 701T transformer A and B protection in order to test new trip circuits to to breaker 501 33.5 Hours
Continuous		  
02-Jul-26 08:00 02-Jul-26 16:00 ENMAX TE Protection & Control (SS-5) 5 sub BMR 84 protection outage - 1 sub transmission line cut over 8 Hours
Daily		  
02-Jul-26 08:00 02-Jul-26 16:00 ENMAX TE Protection & Control (SS-5) 5 sub BMR 81 protection outage - 1 sub transmission line cut over 8 Hours
Daily		  
02-Jul-26 08:30 02-Jul-26 16:30 ALTALINK, Lethbridge Outage 172L (181s Chinook - 370s North Lethbridge), 254s 172W (254s Coaldale), 370s 172E (370s North Lethbridge) 254s172W minor maint 8 Hours
Continuous		  
02-Jul-26 08:30 02-Jul-26 17:00 ALTALINK Outage 63s 427 (63s Red Deer), 427L (63s Red Deer - 247s Piper Creek), 247s 427 (247s Piper Creek), 247s 2 (247s Piper Creek) PRC5 breaker maintenance & first trip 8.5 Hours
Continuous		  
02-Jul-26 09:00 03-Jul-26 17:30 ATCO Outage 2075s ACF22 (2075s Newell), 2075S 931 (2075s Newell) filter bank maintenenace 32.5 Hours
Continuous		  
02-Jul-26 09:00 02-Jul-26 17:00 ALTALINK Outage 19s 156 (19s Wabamun), 156L (19s Wabamun - 156BL tap) 138kV breaker maintenance 8 Hours
Continuous		  
02-Jul-26 09:00 02-Jul-26 10:00 ATCO TE ATCO Telecom Equipment, 739s RTU/SCADA (739s Edith Lake) Edith Lake_S-Telecom- OS upgrade 1 Hour
Continuous		  
02-Jul-26 09:00 02-Jul-26 17:00 ALTALINK, EPCOR RB 920L (71s Lamoureux - 557s Castle Downs) Altalink work - 920LE at Castle Downs 8 Hours
Continuous		  
02-Jul-26 09:00 02-Jul-26 17:00 ALTALINK, EPCOR RB 920L (37s North Calder - 557s Castle Downs) Altalink work - 920LW at Castle Downs 8 Hours
Continuous		  
02-Jul-26 09:00 03-Jul-26 17:00 ALTALINK, BCH TE 1201L (520s Bennett - BCH Cranbrook) support RAS testing 32 Hours
Daily		 AB-BC
02-Jul-26 10:00 02-Jul-26 11:59 ATCO Outage 826s 704 (826s Marguerite Lake) breaker maintenance 1.98 Hours
Continuous		  
02-Jul-26 10:00 03-Jul-26 17:30 ATCO Outage 2029s ACF23 (2029s Heathfield), 2029s 1224 (2029s Heathfield) filter bank maintenance. 31.5 Hours
Continuous		  
02-Jul-26 10:00 02-Jul-26 11:30 ENMAX Outage 5B138-5BT12 (SS-5) 1 sub transmission line cut over 1.5 Hours
Continuous		  
02-Jul-26 10:00 02-Jul-26 17:00 ALTALINK, TRANSALTA Outage 876L (179s Gleichen - 253s Blackie), 253s 876 (253s Blackie), 179s 876 (179s Gleichen) 253s876 first trip and minor maintenance 7 Hours
Continuous		  
02-Jul-26 11:00 06-Jul-26 14:00 ATCO Outage 6L12 (775s Sullivan Lake - 6L25 tap), 775s 602 (775s Sullivan Lake) structure repair 99 Hours
Continuous		  
02-Jul-26 12:00 02-Jul-26 13:59 ATCO Outage 826s 707 (826s Marguerite Lake), 826s 708B (826s Marguerite Lake) breaker maintenance 1.98 Hours
Continuous		  
02-Jul-26 12:00 02-Jul-26 15:00 ENMAX Outage 5B138-5BT7 (SS-5) 1 sub transmission line cut over 3 Hours
Continuous		  
02-Jul-26 12:00 02-Jul-26 16:00 ENMAX Outage 15.62L (SS-15 - SS-16) relay settings changes to 15.62L at 16 sub 4 Hours
Continuous		  
02-Jul-26 13:00 02-Jul-26 14:00 ATCO TE ATCO Telecom Equipment, 743s RTU/SCADA (743s Sarah Lake) Sarah Lake_S-Telecom- OS upgrade to V21 then V22 1 Hour
Continuous		  
02-Jul-26 14:00 02-Jul-26 15:59 ATCO Outage 826s 710 (826s Marguerite Lake), 826s 710A (826s Marguerite Lake) breaker maintenance 1.98 Hours
Continuous		  
03-Jul-26 08:00 03-Jul-26 16:00 ENMAX Outage 26.83L (SS-26 - SS-65), 26B138-26.83 (SS-26) shield wire replacement 8 Hours
Continuous		  
03-Jul-26 08:00 03-Jul-26 16:00 ALTALINK TE 276s RTU/SCADA (276s Union Carbide Prentiss) split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Continuous		  
03-Jul-26 09:00 03-Jul-26 10:59 ATCO Outage 826s 502R (826s Marguerite Lake) breaker maintenance 1.98 Hours
Continuous		  
03-Jul-26 09:00 03-Jul-26 10:00 ATCO TE 720s RTU/SCADA (720s Wabasca) upgrading fawcett_T SAR net 1 OS to V21, then V2 1 Hour
Continuous		  
03-Jul-26 11:00 03-Jul-26 12:59 ATCO Outage 826s 503R (826s Marguerite Lake) breaker maintenance 1.98 Hours
Continuous		  
03-Jul-26 11:00 03-Jul-26 12:00 ATCO TE ATCO Telecom Equipment upgrading flat top tower net 1 SAR OS to V21, then V22 1 Hour
Continuous		  
05-Jul-26 08:00 23-Jul-26 16:00 Syncrude TE Syncrude RTU/SCADA (Syncrude Plant 30-2) replacing an obsolete UPS in 30-2PEB15-2 440 Hours
Continuous		  
05-Jul-26 08:00 05-Jul-26 12:00 ENMAX Outage 16.1TR (SS-16) 16PT69-Z21 PT outage - tap changer top-up 4 Hours
Continuous		  
05-Jul-26 12:01 05-Jul-26 16:00 ENMAX Outage 16.2TR (SS-16) tap changer top-up 3.98 Hours
Continuous		  
06-Jul-26 06:30 15-Jul-26 09:30 ALTALINK Outage 77s 57 (77s Sagitawah) protection upgrade 77s57 219 Hours
Continuous		  
06-Jul-26 06:30 15-Jul-26 09:30 ATCO, ALTALINK RB 9L939 (77s Sagitawah - 809s Louise Creek) Altalink work 219 Hours
Continuous		  
06-Jul-26 07:00 12-Jul-26 17:00 EPCOR Outage 987s T2 (987s Clover Bar), 987s CC721 (987s Clover Bar), 987s C2406 (987s Clover Bar), 987s C2410 (987s Clover Bar) Cloverbar: TX2 doble and CDS1/CDS31/CDS33/CDS43 disconnect maintenance and measurements 154 Hours
Continuous		  
06-Jul-26 07:00 06-Jul-26 11:30 EPCOR Outage 987s CC721 (987s Clover Bar) Cloverbar: CC721 (TX2), bus differential upgrade cutovers 4.5 Hours
Continuous		  
06-Jul-26 07:00 06-Jul-26 11:30 EPCOR Outage 987s CCP7213 (987s Clover Bar) Cloverbar: CCP7213, bus differential upgrade cutovers 4.5 Hours
Continuous		  
06-Jul-26 07:00 16-Jul-26 17:00 ALTALINK TE 368s RTU/SCADA (368s Burdett) 368s RTU configuration update 250 Hours
Daily		  
06-Jul-26 07:00 07-Jul-26 19:00 BPWF Outage 611s T1 (611s Amber), 611s 52-240-1 (611s Amber), 611s 52-CAP1 (611s Amber), 611s 52-F1 (611s Amber), 611s 52-F2 (611s Amber), 611s 52-F3 (611s Amber), 611s 52-F4 (611s Amber), 611s 89-T1 (611s Amber) substation maintenance 36 Hours
Continuous		  
06-Jul-26 07:30 07-Jul-26 15:00 CMH Outage MH-9L (MHS-2 North Industrial - MHS-10 Box Springs), MHS2 MH138-T23 (MHS-2 North Industrial), MHS-2 MH138-218 (MHS-2 North Industrial), MHS-2 MH69-217 (MHS-2 North Industrial) PRC-005 - breaker maintenance on MH138-218/217 at MHS-2, breaker MH138-1002 at MHS-10 be opened for operation of switch MH138-219 at MHS-2 31.5 Hours
Daily		  
06-Jul-26 08:00 13-Jul-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole replacement from test and treat 176 Hours
Continuous		  
06-Jul-26 08:00 06-Jul-26 12:00 ENMAX Outage 65B240-D130 (SS-65) breaker SF6 gas sample 4 Hours
Continuous		  
06-Jul-26 08:00 09-Jul-26 17:00 ALTALINK Outage 310p 1152 (310p Sundance) replace 310p1152 CTs 81 Hours
Continuous		  
06-Jul-26 08:00 08-Jul-26 16:00 ALTALINK TE 183s Protection & Control (183s Underwood) DSP module and fire wall upgrade 56 Hours
Continuous		  
06-Jul-26 08:00 09-Jul-26 16:00 ENMAX Outage 35.2TR (SS-35) transformer power factor test, secondary cable test, maintenance, relay fault pressure test, reversing switch check, oil sampling MT, TC 80 Hours
Continuous		  
06-Jul-26 08:00 07-Jul-26 16:00 ENMAX Outage 32.1TR (SS-32) tap changer inspection 32 Hours
Continuous		  
06-Jul-26 08:00 07-Jul-26 16:00 ENMAX Outage 38.1TR (SS-38) 38.1TR 8 kV bus breaker alignment 32 Hours
Continuous		  
06-Jul-26 08:00 07-Jul-26 16:00 ENMAX Outage 3.3TR (SS-3) relay protection test - 3RLY138-3.3TR A GE 32 Hours
Continuous		  
06-Jul-26 08:00 06-Jul-26 16:00 ENMAX TE Protection & Control (SS-47) 47 sub z31 138 kV bus differential protection, 86-Z31 lockout relay protection outage, relays, lockout testing 47RLY138-Z31 8 Hours
Continuous		  
06-Jul-26 08:00 17-Jul-26 16:00 ALTALINK TE 214s Protection & Control (214s Innisfail), 287s Protection & Control (287s Hazelwood), 55s Protection & Control (55s Olds) LTO and transfer tripping settings changes for RAS scheme updates due to the implementation of 475s mobile sub at 55s 272 Hours
Daily		  
06-Jul-26 08:00 17-Jul-26 16:00 ALTALINK TE 214s RTU/SCADA (214s Innisfail) RAS updates due to 55s mobile sub installation 272 Hours
Daily		  
06-Jul-26 08:00 17-Jul-26 16:00 ALTALINK TE 287s RTU/SCADA (287s Hazelwood) changes to RAS scheme due to addition of 55s mobile sub 272 Hours
Daily		  
06-Jul-26 09:00 09-Jul-26 17:00 ATCO, GREENGATEP, TRANSALTA Outage 9L59 (801s Anderson - 9LA59 tap), 9L59 (972s Tinchebray - 9LA59 tap), 801s 902 (801s Anderson), 801s 903 (801s Anderson), 972s 901 (972s Tinchebray), 972s 902 (972s Tinchebray), 801s 9L59D1 (801s Anderson), 801S 902A (801s Anderson), 801S 903A (801s Anderson), 972s 9L59D2 (972s Tinchebray), 1045s 89-L1 (1045s Garden Plain), 1045s Garden Plain, 1045s 52-L (1045s Garden Plain) connect new 907B to 900BS1
 80 Hours
Continuous		  
06-Jul-26 09:00 10-Jul-26 17:30 ATCO Outage 2075s 902T (2075s Newell), 2075s ACF21 (2075s Newell), 2075S 930 (2075s Newell) PRC-005 - SVC Newell valve cooling maintenance, trip coil testing, breaker 2075s 930 VESDA replacement
, annual fire system inspection		 104.5 Hours
Continuous		  
06-Jul-26 09:00 09-Jul-26 17:00 ATCO TE 801s Protection & Control (801s Anderson), 801s RTU/SCADA (801s Anderson) adjust relay settings and SPS for final configuration after Gaetz energization and 801s RTU outages 80 Hours
Continuous		  
06-Jul-26 09:15 09-Jul-26 17:45 ALTALINK Outage 726L (37s North Calder - 71s Lamoureux), 37s 726E (37s North Calder) transmission line maintenance 80.5 Hours
Continuous		  
06-Jul-26 09:30 09-Jul-26 13:00 ATCO Outage 856s 903T (856s Kinosis)
PRC-005 - transformer maintenance, trip coil testing on 903 and 906 during this switching		 75.5 Hours
Continuous		  
06-Jul-26 10:00 17-Jul-26 17:30 ATCO Outage 763s 602T (763s Hanna), 763s 604 (763s Hanna) 500D1 repair
- 602T itm replacement
 271.5 Hours
Continuous		  
06-Jul-26 10:00 07-Jul-26 16:00 ATCO Outage 825s 901 (825s Whitefish Lake) breaker maintenance 30 Hours
Continuous		  
06-Jul-26 10:00 06-Jul-26 11:00 ATCO TE ATCO Telecom Equipment West Peace_S-telecom - re-configuration
1 Hour
Continuous		  
06-Jul-26 10:00 06-Jul-26 11:00 Lethbridge TE 181s Protection & Control (181s Chinook) 181s 463L breaker (GE C60) protection outage - replace internal relay battery 1 Hour
Continuous		  
06-Jul-26 12:01 08-Jul-26 18:00 ENMAX Outage 33.1TR (SS-33) 33 sub 33.1TR Dev 90 replacement 53.98 Hours
Continuous		  
06-Jul-26 12:01 06-Jul-26 16:00 ENMAX Outage 65B240-D131 (SS-65) breaker SF6 gas sample 3.98 Hours
Continuous		  
06-Jul-26 13:00 09-Jul-26 16:00 ALTALINK Outage 385s T3 (385s Spring Coulee) 385sT3 filter install and tap changer investigation 75 Hours
Continuous		  
06-Jul-26 13:00 16-Jul-26 17:00 ALTALINK Outage 761L (38s East Edmonton - 71s Lamoureux), 38s 761N (38s East Edmonton), 71s 552 (71s Lamoureux), 71s 652 (71s Lamoureux), 71s 761W (71s Lamoureux) 38s761N breaker replacement, replace 71s39, maintenance on 71s761W 244 Hours
Continuous		  
06-Jul-26 13:00 09-Jul-26 14:00 ATCO RB 6L56 (763s Hanna - 802s Michichi Creek) climbing inspection on 6L56 between Hanna and Michichi 73 Hours
Continuous		  
06-Jul-26 13:30 09-Jul-26 17:00 ALTALINK Outage 104s T1 (104s Watson Creek), 104s 152 (104s Watson Creek) transformer maintenance, doble and leak repairs 75.5 Hours
Continuous		  
06-Jul-26 13:30 09-Jul-26 17:00 ALTALINK Outage 320p PS2 (320p Keephills), 320p 2652 (320p Keephills), 320p 2752 (320p Keephills) 320sPS2 PRC5 maintenance & leak repairs 75.5 Hours
Continuous		  
06-Jul-26 14:00 16-Jul-26 17:00 ALTALINK TE 38s Protection & Control (38s East Edmonton) 38s761N 138 kV breaker replacement, isolations, protection testing

243 Hours
Continuous		  
07-Jul-26 07:00 09-Jul-26 17:00 ALTALINK RB 76L (33s Spray - 115s Mount Allan) 76L structure 58,63 - prep/woodpecker inspection
58 Hours
Daily		  
07-Jul-26 07:00 07-Jul-26 18:00 ALTALINK Outage 754L (118s Canmore - 437s Baymag), 118s 754E (118s Canmore) change spar arm
11 Hours
Continuous		  
07-Jul-26 07:00 09-Jul-26 17:00 ALTALINK TE 170s Protection & Control (170s Pike) DSP module and firewall update 58 Hours
Continuous		  
07-Jul-26 07:00 10-Jul-26 17:00 ALTALINK Outage 896L (19s Wabamun - 432s Carvel), 19s 896 (19s Wabamun), 432s 896 (432s Carvel) cross arm and structure repair 82 Hours
Continuous		  
07-Jul-26 07:00 07-Jul-26 11:30 EPCOR Outage 987s GB1B (987s Clover Bar) bus diff upgrade cutovers 4.5 Hours
Continuous		  
07-Jul-26 07:30 07-Jul-26 18:30 ATCO, ALTALINK RB 986L (87s Gaetz - 972s Tinchebray) Repair broken wire strand 11 Hours
Daily		  
07-Jul-26 08:00 13-Jul-26 16:00 ATCO RB 7L10 (754s Ksituan River - 7LA10 tap), 7L10 (730s Rycroft - 7LA10 tap) 7L10 TCM pole replacement (live line ) 152 Hours
Continuous		  
07-Jul-26 08:00 07-Jul-26 17:00 ALTALINK TE 346s RTU/SCADA (346s Kaybob) split the existing SCADA VLAN, updating SCADA LAN switch settings, firewall upgrade, and telecom switch 9 Hours
Continuous		  
07-Jul-26 08:00 07-Jul-26 12:00 ENMAX Outage 65B240-D132 (SS-65) breaker SF6 gas sample 4 Hours
Continuous		  
07-Jul-26 08:00 13-Jul-26 16:00 ATCO RB 7L03 (749s Flyingshot Lake - 7L09 tap), 7L03 (731s Elmworth - 7L09 tap) changing red tag poles on 7L03 structures 19, 131 and 132 152 Hours
Continuous		  
07-Jul-26 08:00 08-Jul-26 16:00 ALTALINK TE 385s Protection & Control (385s Spring Coulee) protection outage to investigate T3 MVAR polarity discrepancy 32 Hours
Continuous		  
07-Jul-26 08:00 08-Jul-26 16:00 ALTALINK TE 385s RTU/SCADA (385s Spring Coulee) RTU outages to investigate T3 MVAR polarity discrepancy 32 Hours
Continuous		  
07-Jul-26 08:00 08-Jul-26 17:00 ALTALINK TE AltaLink Telecom Equipment 118s Canmore 9035R, Rundle radio 9500 radio upgrade 33 Hours
Continuous		  
07-Jul-26 08:00 07-Jul-26 20:00 SUNCOR TE 29EDD-34 RTU/SCADA (29EDD-34) line meter replacement 12 Hours
Continuous		  
07-Jul-26 08:00 29-Oct-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		  
07-Jul-26 08:00 07-Jul-26 16:00 ATCO, AESO-SC Outage 7L80 (733s Simonette - 857s Kakwa Ridge), 7L80 (740s H.R. Milner - 857s Kakwa Ridge), 733s 701 (733s Simonette), 7L80-Pseudo (740s H.R. Milner) moving structure 590A on 7L80 couple meters back due to erosion issue of the river 8 Hours
Continuous		  
07-Jul-26 08:00 09-Jul-26 16:00 ALTALINK TE 121s Protection & Control (121s Brooks) standard maintenance 56 Hours
Daily		  
07-Jul-26 08:00 07-Jul-26 16:00 ENMAX TE Protection & Control (SS-47) relays, lockout outage and testing at 47 sub 8 Hours
Continuous		  
07-Jul-26 08:00 08-Jul-26 16:00 Syncrude Outage MH1 (Aurora - Aurora) maintenance on MH-1 powerline 32 Hours
Continuous		  
07-Jul-26 08:00 07-Jul-26 18:00 ATCO, ALTALINK RB 9L86 (87s Gaetz - 972s Tinchebray) repair broken wire strand 10 Hours
Continuous		  
07-Jul-26 08:30 08-Jul-26 17:30 ALTALINK, TRANSALTA RB 733L (179s Gleichen - 428s Namaka), 179s 733 (179s Gleichen), 428s 733X (428s Namaka) 733L pole delivery in proximity to line for future structure 161, 163, 165, 193, 196, 211work 33 Hours
Daily		  
07-Jul-26 08:30 07-Jul-26 17:00 ATCO, ALTALINK Outage 7L696 (508s Lakesend - 892s Ribstone Creek), 508s T1 (508s Lakesend), 508s 696 (508s Lakesend), 892s 702 (892s Ribstone Creek) replace SST, replace AC panel 8.5 Hours
Daily		  
07-Jul-26 09:00 07-Jul-26 16:00 ATCO TE ATCO Telecom Equipment radio maintenance 7 Hours
Continuous		  
07-Jul-26 09:00 07-Jul-26 16:00 ATCO TE ATCO Telecom Equipment telecommunications maintenance 7 Hours
Continuous		  
07-Jul-26 12:00 07-Jul-26 17:00 EPCOR Outage 987s CGB3 (987s Clover Bar), 987s GT3 (987s Clover Bar) bus differential upgrades 5 Hours
Continuous		  
07-Jul-26 12:01 07-Jul-26 16:00 ENMAX Outage 65B240-D133 (SS-65) breaker SF6 gas sample 3.98 Hours
Continuous		  
08-Jul-26 06:00 08-Jul-26 17:00 ATCO TE ATCO RTU/SCADA SOC2 backup control centre activation 11 Hours
Continuous		  
08-Jul-26 07:00 08-Jul-26 18:00 ATCO, ALTALINK IO 9L912 (63s Red Deer - 766s Nevis), 766s 902 (766s Nevis) AltaLink scope: replacing insulators on structure 36, switching line out of service for AltaLink to perform maintenance
11 Hours
Continuous		  
08-Jul-26 07:00 08-Jul-26 13:00 ALTALINK Outage 214s 419 (214s Innisfail), 287s 752 (287s Hazelwood), 419L (214s Innisfail - 287s Hazelwood), 287s 419 (287s Hazelwood) implement 419L LTO into RAS scheme 6 Hours
Continuous		  
08-Jul-26 07:00 08-Jul-26 17:00 EPCOR Outage 987s CC13 (987s Clover Bar) Cloverbar: CC13, bus diff upgrade cutovers 10 Hours
Continuous		  
08-Jul-26 07:00 09-Jul-26 19:00 BPWF Outage 611s T2 (611s Amber), 611s 52-240-2 (611s Amber), 611s 52-CAP2 (611s Amber), 611s 52-F5 (611s Amber), 611s 52-F6 (611s Amber), 611s 52-F7 (611s Amber), 611s 52-F8 (611s Amber) substation maintenance 36 Hours
Continuous		  
08-Jul-26 08:00 08-Jul-26 18:00 Syncrude TE Syncrude ICCP Outage SCADA - server update 10 Hours
Daily		  
08-Jul-26 08:00 08-Jul-26 17:00 ALTALINK, ATCO Outage 63s 852 (63s Red Deer), 63s 952 (63s Red Deer), 912L (63s Red Deer - 766s Nevis), 766s 902 (766s Nevis), 766s 9L912D1 (766s Nevis) replacing insulators on structure 36 9 Hours
Continuous		  
08-Jul-26 08:00 08-Jul-26 17:00 ALTALINK TE 348s RTU/SCADA (348s Marlboro) split the existing SCADA VLAN from 1 to 1 and 2 9 Hours
Continuous		  
08-Jul-26 08:00 08-Jul-26 16:00 ENMAX Outage 162B138-RB92 (SS-162) HV breaker maintenance 8 Hours
Continuous		  
08-Jul-26 08:00 09-Jul-26 17:00 ATCO RB 7L24 (700s Bonnyville - 7LA24 tap), 7L24 (846s Grand Centre - 7LA24 tap) straighten poles - 7L24-280, 7L24-281 33 Hours
Continuous		  
08-Jul-26 08:00 08-Jul-26 16:00 ATCO, AESO-SC Outage 7L20 (740s H.R. Milner - 810s Dome Cutbank), 740s 704 (740s H.R. Milner), 7L20-Pseudo (740s H.R. Milner) moving str 7A on 7L20 couple meters back due to erosion issue of the river 8 Hours
Continuous		  
08-Jul-26 08:00 09-Jul-26 16:00 ENMAX Outage 31.3TR (SS-31) tap changer inspection, reversing switch check, oil sampling MT, TC, oil filtration maintenance
32 Hours
Continuous		  
08-Jul-26 08:00 09-Jul-26 16:00 ENMAX Outage 38.2TR (SS-38) 38.2TR 8 kV bus breaker alignment 32 Hours
Continuous		  
08-Jul-26 08:00 09-Jul-26 16:00 ENMAX TE Protection & Control (SS-3) 3 sub BMR 84 protection outage - relay protection test - 3RLY138-3.BMR84 32 Hours
Daily		  
08-Jul-26 08:00 08-Jul-26 16:00 ENMAX Outage 36.2TR (SS-36) gas trip switch replacement 8 Hours
Continuous		  
08-Jul-26 09:00 08-Jul-26 16:00 ATCO TE ATCO Telecom Equipment Ipiatik and Touchwood telecom
capacity and reliability upgrades		 7 Hours
Continuous		  
08-Jul-26 09:00 08-Jul-26 11:00 ATCO TE ATCO Telecom Equipment, 946s RTU/SCADA (946s Oakland) upgrade the NET 2 and NET 11 SAR OS 2 Hours
Continuous		  
08-Jul-26 09:00 08-Jul-26 16:00 ATCO TE 885s RTU/SCADA (885s McMillan), ATCO Telecom Equipment McMillan_T-Telecom- radio major constellation link - Algar to McMillan 7 Hours
Continuous		  
08-Jul-26 09:00 08-Jul-26 17:00 BCH Outage 5L91 (BCH Ashton Creek - BCH Selkirk) maintenance 8 Hours
Continuous		 AB-BC
08-Jul-26 09:00 10-Jul-26 16:30 ATCO TE 845s Protection & Control (845s Big Mountain) settings update 55.5 Hours
Continuous		  
08-Jul-26 09:00 10-Jul-26 16:30 ATCO TE 749s Flyingshot Lake Protection & Control settings update 55.5 Hours
Continuous		  
08-Jul-26 10:00 09-Jul-26 16:00 ATCO Outage 825s 902 (825s Whitefish Lake) breaker maintenance 30 Hours
Continuous		  
08-Jul-26 12:00 08-Jul-26 17:00 ALTALINK Outage 214s 420 (214s Innisfail), 287s 1152 (287s Hazelwood), 420L (214s Innisfail - 287s Hazelwood), 287s 420 (287s Hazelwood) implement 420L LTO into RAS scheme 5 Hours
Continuous		  
09-Jul-26 06:00 15-Jul-26 18:00 SUNCOR Outage 635EDD-1000 635PT-1002 (635EDD-1000), 635EDD-1000 635-752-133 (635EDD-1000), 635EDD-1000 635PS-1041 (635EDD-1000) maintenance on 144 kV and 72 kV equipment 156 Hours
Continuous		  
09-Jul-26 07:00 09-Jul-26 15:00 CMH Outage MHS-2 MH69-221 (MHS-2 North Industrial) breaker maintenance 8 Hours
Continuous		  
09-Jul-26 07:00 09-Jul-26 18:00 ALTALINK Outage 1140L (89s Ellerslie - 289s Saunders Lake) Replacing insulators on structure 36 11 Hours
Continuous		  
09-Jul-26 07:00 09-Jul-26 18:00 ALTALINK RB 1112L (89s Ellerslie - 289s Saunders Lake) close proximity work replacing insulators on 1140L 11 Hours
Continuous		  
09-Jul-26 07:00 14-Jul-26 17:00 ALTALINK TE 77s RTU/SCADA (77s Sagitawah) RTU database update 130 Hours
Continuous		  
09-Jul-26 07:00 09-Jul-26 11:30 EPCOR Outage 987s C1 (987s Clover Bar) bus differential upgrade 4.5 Hours
Continuous		  
09-Jul-26 08:00 10-Jul-26 18:00 ENMAX Outage 33.2TR (SS-33) 33 sub 33.2TR Dev 90 replacement 34 Hours
Continuous		  
09-Jul-26 08:00 09-Jul-26 17:00 ALTALINK TE 131s RTU/SCADA (131s Moon Lake), 235s RTU/SCADA (235s Entwistle), 283s RTU/SCADA (283s Violet Grove), AltaLink Telecom Equipment firewall upgrade, MPLS node firmware update. SCADA SUB LAN work 9 Hours
Continuous		  
09-Jul-26 08:00 09-Jul-26 12:00 ENMAX Outage 65B138-D82 (SS-65) HV breaker SF6 gas sample - 65B138-D82 4 Hours
Continuous		  
09-Jul-26 08:00 09-Jul-26 16:00 ALTALINK TE AltaLink Telecom Equipment urgent repair - 412s MPLS node cycling 8 Hours
Daily		  
09-Jul-26 09:00 09-Jul-26 16:00 ATCO TE ATCO Telecom Equipment Capacity & Reliability upgrades. Changing radio through put from 150Mbps to 300+ on link Touchwood to Whitefish
Impacted services:
9L37 A&B WFISH-MARGLAKE
9L22 A&B HEARTLAKE-MARGLAKE
9L81 A&B HEARTLAKE-MARGLAKE
9L36 A&B WFISH-MARGLAKE
 7 Hours
Continuous		  
09-Jul-26 09:00 09-Jul-26 16:00 ATCO TE ATCO Telecom Equipment, 2009s RTU/SCADA (2009s Willow Lake) MDR link Salt Creek to Willow
 7 Hours
Continuous		  
09-Jul-26 10:00 09-Jul-26 16:00 ATCO TE ATCO Telecom Equipment REPLACING THE SUSPECTED FAULTY FLASH CARD ON THE SASKATOON MTN IRU 600 RADIO FACING GRANDE PRAIRIE.
IMPACT TO THE FOLLOWING TRAFFIC FOR UP TO 6 HOURS TO TROUBLESHOOT RADIO:

TPRCP082 / 7L33 A - BIG MOUNTAIN / FLYINGSHOT
TPRCP085 / 7L33 B - BIG MOUNTAIN / FLYINGSHOT
Change relay settings on 7L33 		6 Hours
Continuous		  
09-Jul-26 11:30 09-Jul-26 17:00 EPCOR Outage 72CH9 (987s Clover Bar - EP Hardisty), 987s CH722 (987s Clover Bar) bus differential upgrade 5.5 Hours
Continuous		  
09-Jul-26 12:00 09-Jul-26 16:00 ENMAX Outage 65B138-D83 (SS-65) HV breaker SF6 gas sample - 65B138-D83 4 Hours
Continuous		  
09-Jul-26 13:01 09-Jul-26 15:00 ATCO Outage 856s 901 (856s Kinosis) PRC-005 trip coil testing 1.98 Hours
Continuous		  
09-Jul-26 14:00 09-Jul-26 15:00 ATCO RB 7L34 (815s Goodfare - 886s Updike) connect 902S mobile 3 - closing jumper J1 1 Hour
Continuous		  
10-Jul-26 07:00 10-Jul-26 17:00 EPCOR Outage 987s CC24 (987s Clover Bar) bus differential protection upgrade cutovers 10 Hours
Continuous		  
10-Jul-26 07:30 10-Jul-26 15:00 CMH Outage CS21 (MHS-2 North Industrial) PRC-005 maintenance - breaker maintenance on MH69-208 at MHS-2S North Industrial substation and associated relay 7.5 Hours
Continuous		  
10-Jul-26 08:00 10-Jul-26 17:00 ENMAX, ALTALINK Outage 37.82L (74s Janet - SS-37), 74s 37.82W (74s Janet), 37B138-37.82 (SS-37) shield wire replacement 9 Hours
Continuous		  
10-Jul-26 08:00 10-Jul-26 16:00 ALTALINK TE 286s RTU/SCADA (286s Yasa) split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Continuous		  
10-Jul-26 09:00 13-Jul-26 20:00 SUNCOR TE 29PL9-17 (29EDD-1 Millennium - 29EDD-94 Voyageur) 29EDD1 - 29PT419/29PL9-17 system protection isolation only 83 Hours
Continuous		  

Prepared On:   2026-06-30   16:32:32

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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