Alberta Electric System Operator
System Co-ordination Plan
2026-06-13 to 2026-06-19
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 30-Jun-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 11,217 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 19-Jun-26 16:00 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 2,402.25 Hours
Continuous		  
22-Mar-26 13:00 30-Jun-26 17:00 BHE Canada Outage 120s C1 (120s Picture Butte), 120s C2 (120s Picture Butte) forced outage 2,404 Hours
Continuous		  
28-Mar-26 12:00 26-Jun-26 17:00 ATCO TE 833s RTU/SCADA (833s Mariana) updating RTU/station controller configuration during SCADA upgrade project 1,661 Hours
Continuous		  
06-Apr-26 08:00 19-Jun-26 16:00 ALTALINK TE 37s RTU/SCADA (37s North Calder) RTU database updates 1,784 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) 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) 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		  
20-May-26 09:00 16-Jun-26 17:00 ALTALINK Outage 275s T2 (275s Jenner), 275s 46 (275s Jenner), 275s 2252 (275s Jenner) maintenance 656 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 19-Jun-26 17:00 ALTALINK Outage 526s C1 (526s Buffalo Creek) forced outage 551 Hours
Daily		  
30-May-26 09:00 13-Jun-26 17:00 ATCO, ALTALINK Outage 972s 906 (972s Tinchebray), 972s 905 (972s Tinchebray), 9L62 (87s Gaetz - 972s Tinchebray) connect new 9L62 to 972S and prepare to energize, string conductors 9L62 from str #3 to substation to 9L62D1, coordinate with AML conductor jumpers and termination at 9L86 Str 409 344 Hours
Continuous		  
01-Jun-26 08:00 25-Jun-26 16:00 ALTALINK TE 37s Protection & Control (37s North Calder) trip test 37s76, 37s81 584 Hours
Continuous		  
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		  
04-Jun-26 08:00 13-Jun-26 16:00 Syncrude Outage TL-1 (Aurora - Aurora), 14 (Aurora), 13 (Aurora) CT-14 in G01 Substation at Aurora needs to be replaced 224 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 00:00 29-Jun-26 23:59 ATCO Outage 9L45 (856s Kinosis - 2049s Kettle River) forced outage 527.98 Hours
Continuous		  
08-Jun-26 07:00 14-Jun-26 17:00 EPCOR, ALTALINK Outage 657s T3 (657s Summerside), 657s SU2405 (657s Summerside), 657s SU2401 (657s Summerside), 657s SUAB3 (657s Summerside) Summerside: T3 Doble and disconnect maintenance 154 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 16-Jun-26 20:00 SUNCOR Outage 29EDD-94 29PP-97 260kV Bus (29EDD-94 Voyageur), 29EDD-94 29-952-9701 (29EDD-94 Voyageur), 29EDD-94 29-952-9712 (29EDD-94 Voyageur), 29EDD-94 29-952-9706 (29EDD-94 Voyageur), 29EDD-94 29-952-9707 (29EDD-94 Voyageur), 29EDD-94 29PS-386 (29EDD-94 Voyageur), 29EDD-94 29PS-638 (29EDD-94 Voyageur), 29EDD-94 29PS-395 (29EDD-94 Voyageur), 29EDD-94 29PS-629 (29EDD-94 Voyageur) leak repair and top up 108 Hours
Continuous		  
08-Jun-26 08:00 26-Jun-26 16:00 ENMAX Outage 37.2TR (SS-37) maintenance 440 Hours
Continuous		  
08-Jun-26 08:00 19-Jun-26 14:30 CMH, TCPL TE MH-65L (MHS-7 Brier Park - Cancarb Energy Medicine Hat) maintenance on the LDR-65L-B 270.5 Hours
Continuous		  
08-Jun-26 08:00 26-Jun-26 10:00 ALTALINK, ATCO Outage 87s 240kV East Bus (87s Gaetz), 9L62 (87s Gaetz - 972s Tinchebray), 962L (87s Gaetz - 972s Tinchebray), 986L (87s Gaetz - 972s Tinchebray), 9L86 (87s Gaetz - 972s Tinchebray), 87s T2 (87s Gaetz), 87s 1252 (87s Gaetz), 87s 1652 (87s Gaetz), 87s 1552 (87s Gaetz), 87s 1952 (87s Gaetz), 87s 34 (87s Gaetz) completing all telecom work & protection testing with ATCO 514 Hours
Continuous		  
08-Jun-26 08:00 19-Jun-26 16:00 ENMAX Outage 38.1TR (SS-38) transformer power factor test 80 Hours
Continuous		  
08-Jun-26 09:00 21-Jun-26 20:00 SUNCOR Outage 29EDD-34 29PT-341 (29EDD-34), 29EDD-34 29-952-142 (29EDD-34), 29EDD-34 29-952-143 (29EDD-34), 29EDD-34 29-652-10200T (29EDD-34), 29EDD-34 29-652-10301 (29EDD-34), 29EDD-34 29-652-10302 (29EDD-34), 29EDD-34 29-652-10303 (29EDD-34), 29EDD-34 29PS-0375 (29EDD-34), 29EDD-34 29PS-0380 (29EDD-34), 29EDD-34 29PS-0381 (29EDD-34), 29EDD-34 29PS-0383 (29EDD-34), 29EDD-34 29PS-609 (29EDD-34) 10 year PM on 29EDD34;29PT-341 system and 5 year, 10 year PM on 29EDD34;29PP-103 system
 323 Hours
Continuous		  
08-Jun-26 09:00 22-Jun-26 17:00 ATCO Outage 7L88 (865s Saddle Hills - 7L22 tap), 865s 701T (865s Saddlehills), 865s 701 (865s Saddle Hills) protection and scada upgrade on 865S 344 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 16-Jun-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 16-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 50BF/605 for relay testing 178.5 Hours
Continuous		  
09-Jun-26 07:00 16-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) minor setting changes on 21B/6L11 relay 178.5 Hours
Continuous		  
09-Jun-26 07:00 16-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) minor setting changes on 21B/6L11 relay 178.5 Hours
Continuous		  
09-Jun-26 07:00 16-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) minor setting changes on 21B/6L11 relay 178.5 Hours
Continuous		  
09-Jun-26 07:00 16-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) minor settings changes on 21B/6L126 178.5 Hours
Continuous		  
10-Jun-26 08:00 23-Jun-26 16:00 SUNCOR TE 29EDD-34 RTU/SCADA (29EDD-34) add duplicate power sources 80 Hours
Continuous		  
10-Jun-26 09:00 19-Jun-26 17:00 BCH Outage 2L294 (BCH A. A. Lambert - BCH Cranbrook), T3 (BCH Cranbrook), T7 (BCH Cranbrook) insulator replacement 224 Hours
Continuous		 AB-BC
12-Jun-26 08:00 14-Jun-26 16:00 ALTALINK TE 72s RTU/SCADA (72s Leismer) updating SCADA LAN switch settings
56 Hours
Continuous		  
12-Jun-26 08:00 13-Jun-26 16:00 ENMAX TE RTU/SCADA (SS-162) communications outages 32 Hours
Daily		  
13-Jun-26 07:00 13-Jun-26 17:00 EPCOR TE 987s RTU/SCADA (987s Clover Bar) Cloverbar: RTU outage, substation firewall replacement – full communications outage 10 Hours
Continuous		  
13-Jun-26 08:00 13-Jun-26 16:00 ENMAX Outage 11.83L (SS-162 - SS-11), 11B138-11.83 (SS-11), 162B138-RB85 (SS-162), 162B138-RB84 (SS-162) power factor test - 162PT138-11.83 8 Hours
Continuous		  
13-Jun-26 08:00 14-Jun-26 16:00 ALTALINK TE 993s RTU/SCADA (993s Abee) split the existing SCADA VLAN
32 Hours
Continuous		  
13-Jun-26 08:00 13-Jun-26 18:00 ENMAX Outage 32.83L (SS-32 - SS-40), 40.1TR (SS-40), 32B138-32.83 (SS-32), 40B138-32.83 (SS-40) substation structure painting 10 Hours
Continuous		  
13-Jun-26 08:00 13-Jun-26 16:00 ALTALINK Outage 133s T1 (133s Stelco Edmonton), 133s T2 (133s Stelco Edmonton) measurements for 133s7 replacement 8 Hours
Continuous		  
13-Jun-26 08:00 21-Jun-26 17:00 ALTALINK TE 72s Protection & Control (72s Leismer) protection outages to connect CTs and perform functional trips during the 475s mobile installation to facilitate the urgent 72s T2 outage 201 Hours
Continuous		  
13-Jun-26 14:00 15-Jun-26 12:30 ALTALINK Outage 72s T1 (72s Leismer) outage to connect 475s mobile substation to 72s26 and 72s 25kV bus 46.5 Hours
Continuous		  
13-Jun-26 17:01 26-Jun-26 17:00 ATCO, ALTALINK Outage 9L62 (87s Gaetz - 972s Tinchebray) work on parallel line 9L86 272 Hours
Continuous		  
14-Jun-26 07:00 14-Jun-26 17:00 EPCOR TE 814s RTU/SCADA (814s Bellamy) RTU outage, substation firewall replacement 10 Hours
Continuous		  
14-Jun-26 08:00 14-Jun-26 18:00 ENMAX Outage 40.81L (SS-40 - SS-41), 40B138-40.81 (SS-40), 41B138-40.81 (SS-41), 40.2TR (SS-40), 40MD138-40.2TR (SS-40) substation structure painting 10 Hours
Continuous		  
14-Jun-26 08:30 19-Jun-26 14:00 ENMAX Outage 13.82L (SS-13 - SS-22), 13B138-13.82 (SS-13), 22B138-13.82 (SS-22) disconnect switch replacement 125.5 Hours
Continuous		  
14-Jun-26 09:00 14-Jun-26 16:00 ENMAX TE Protection & Control (SS-162) cutover breaker management relays to new SDN switches. 7 Hours
Continuous		  
14-Jun-26 09:00 15-Jun-26 16:00 ENMAX TE RTU/SCADA (SS-162) DNP communication only, cutting over to new firewall and SDN switches 31 Hours
Daily		  
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 19-Jun-26 17:00 EPCOR Outage EP 511s Victoria T3 (EP 511s Victoria), EP 511s V724 (EP 511s Victoria), EP 511s V725 (EP 511s Victoria) Victoria: TX3 Relay Maintenance and V724/V725 (SF6) Breaker Maintenance 106 Hours
Continuous		  
15-Jun-26 07:00 19-Jun-26 17:00 EPCOR Outage 987s GT2 (987s Clover Bar), 987s CGB2 (987s Clover Bar) Cloverbar: customer maintenance 106 Hours
Continuous		  
15-Jun-26 07:00 19-Jun-26 17:00 ALTALINK, EPCOR Outage 1058L (657s Summerside - EP 803s Lambton), EP 803s L2404 (EP 803s Lambton), EP 803s L2403 (EP 803s Lambton), S724 (Strathcona) aerial washing program 106 Hours
Continuous		  
15-Jun-26 07:00 26-Jun-26 17:00 ALTALINK, EPCOR TE 1056L (89s Ellerslie - 629s Argyll Transfer Station) MPLS upgrade cutover and commissioning 274 Hours
Continuous		  
15-Jun-26 07:00 16-Jun-26 16:00 ENMAX Outage 1.82L (SS-1 - SS-5), B138-87 (SS-1), B138-88 (SS-1) 1 sub transmission line cut over and commissioning 33 Hours
Continuous		  
15-Jun-26 07:00 18-Jun-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) RTU/HMI change: testing and commissioning SCADA points for line 986L CETO project 82 Hours
Daily		  
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 19-Jun-26 17:00 EPCOR Outage 987s 72kV Bus 3 (987s Clover Bar), 72CK12 (987s Clover Bar - Kennedale), 987s CC13 (987s Clover Bar), 987s CCP7213 (987s Clover Bar), 987s CGB2 (987s Clover Bar), 987s CK725 (987s Clover Bar) Cloverbar: 72kV BUS 3 outage, CVT doble and disconnect maintenance 106 Hours
Continuous		  
15-Jun-26 07:00 26-Jun-26 17:00 EPCOR Outage 72JM18 (EP 805s Jasper - Meadowlark), M721 (Meadowlark), M722 (Meadowlark), T1 (Meadowlark) Meadowlark: TX1 Zone, LCR Civil Work 274 Hours
Continuous		  
15-Jun-26 07:30 18-Jun-26 18:00 ALTALINK Outage 1325L (510s Sunnybrook - AML 511s Crossings), AML 511s T11 (AML 511s Crossings), 510s T11 (510s Sunnybrook), 510s 2652 (510s Sunnybrook), 510s 2752 (510s Sunnybrook), AML 511s 4852 (AML 511s Crossings), AML 511s 4952 (AML 511s Crossings) component replacement on 1325L 82.5 Hours
Continuous		  
15-Jun-26 07:30 25-Jun-26 09:30 ALTALINK Outage 905L (19s Wabamun - 37s North Calder), 19s 905 (19s Wabamun), 37s 82 (37s North Calder), 37s 76 (37s North Calder) P&C upgrade (37s76, 37s82) 242 Hours
Continuous		  
15-Jun-26 07:30 15-Jun-26 16:30 ALTALINK RB 757L (297s Rimbey - 758L tap), 758L (534s Eckville - 757L tap), 757L (17s Benalto - 758L tap) 758L4-21 crossarm/structure replacements 9 Hours
Daily		  
15-Jun-26 08:00 15-Jun-26 16:00 ENMAX Outage 9.80L (SS-9 - SS-31), 31B138-9.80 (SS-31), 9B138-9.80 (SS-9) SF6 gas sample 8 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ATCO RB 7L10 (754s Ksituan River - 7LA10 tap), 7L10 (730s Rycroft - 7LA10 tap) 7L10 TCM pole replacement (live line ) 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole replacement from test and treat 80 Hours
Continuous		  
15-Jun-26 08:00 26-Jun-26 16:00 ALTALINK TE 89s Protection & Control (89s Ellerslie) MPLS TPR re-arrangements project: relay testing and cutover 272 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 364s RTU/SCADA (364s Whitecourt Industrial) firewall replacement + MPLS 705 A&B node upgrade 80 Hours
Continuous		  
15-Jun-26 08:00 25-Jun-26 09:00 ALTALINK, EPCOR RB 930L (37s North Calder - Poundmaker) reclose block for Altalink working on 37s North Calder 241 Hours
Continuous		  
15-Jun-26 08:00 25-Jun-26 09:00 ALTALINK, EPCOR RB 920L (37s North Calder - 557s Castle Downs) reclose block for Altalink working on 37s North Calder 241 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-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 80 Hours
Continuous		  
15-Jun-26 08:00 17-Jun-26 16:00 ENMAX Outage 31.2TR (SS-31) relay protection test 56 Hours
Continuous		  
15-Jun-26 08:00 03-Jul-26 16:00 ALTALINK TE 254s RTU/SCADA (254s Coaldale) RTU replacement 440 Hours
Daily		  
15-Jun-26 08:00 21-Jun-26 14:00 ATCO Outage 6L15 (763s Hanna - 775s Sullivan Lake), 763s 602 (763s Hanna), 775s 601 (775s Sullivan Lake) 10-year climbing inspection on 6L15 150 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ENMAX Outage 41.1TR (SS-41) transformer power factor test, secondary cable test, transformer maintenance relay fault pressure test 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 397s RTU/SCADA (397s Benbow) RTU outage required to add and test AIS1159 alarms 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 328s RTU/SCADA (328s Pine Creek) RTU outage required for HMI password update 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 1182s RTU/SCADA (1182s Berland River) RTU outage required to add 138kV bus volts metering 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 397s Protection & Control (397s Benbow) protection outages required to add AIS trip 3 alarm from A77/AIS1159 & B77/AIS1159 protections 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 1182s Protection & Control (1182s Berland River) protection outages required to add bus volts from T1 protections (redundant), and test 43/152 input to 96/152 protection (non-redundant) 80 Hours
Continuous		  
15-Jun-26 08:00 15-Jun-26 16:00 ALTALINK TE AML 511s RTU/SCADA (AML 511s Crossings) update the RTU/HMI configuration for the new intrusion alarms to meet the ARS target zero compliance 8 Hours
Continuous		  
15-Jun-26 09:00 29-Jun-26 10:00 ATCO, CNRL Outage 859s 701T (859s Primrose), 859s 701 (859s Primrose), 859s 701TD (859s Primrose), 859s 704 (859s Primrose) maintenance 337 Hours
Continuous		  
15-Jun-26 09:00 18-Jun-26 17:00 ALTALINK Outage 245s 10 (245s Seebe) CT replacement 77 Hours
Continuous		  
15-Jun-26 09:00 19-Jun-26 17:30 ALTALINK, EPCOR IO 915L (38s East Edmonton - 987s Clover Bar) 915L/Cloverbar: CT/CVT/SA Doble and CDS35/CDS36/CDS7 Disconnect Maintenance and Relay Maintenance 103.5 Hours
Continuous		  
15-Jun-26 09:00 20-Jun-26 17:30 ALTALINK, EPCOR IO 1139L (367s Harry Smith - EP Riverview) zone doble, disconnect and breaker maintenance 127.5 Hours
Continuous		  
15-Jun-26 09:30 19-Jun-26 17:00 ALTALINK, EPCOR Outage 915L (38s East Edmonton - 987s Clover Bar), 987s C2403 (987s Clover Bar), 987s C2405 (987s Clover Bar) doble and disconnect and relay maintenance 103.5 Hours
Continuous		  
15-Jun-26 09:30 20-Jun-26 17:00 ALTALINK, EPCOR Outage 1139L (367s Harry Smith - EP Riverview), RW2405 (EP Riverview), RW2403 (EP Riverview) zone doble, disconnect and breaker maintenance 127.5 Hours
Continuous		  
15-Jun-26 10:00 16-Jun-26 16:00 ATCO Outage 970s 708 (970s Bourque) breaker maintenance 30 Hours
Continuous		  
15-Jun-26 10:00 17-Jun-26 12:00 ATCO Outage 2029s ACF12 (2029s Heathfield), 2029s 1219 (2029s Heathfield) filter bank AC maintenance at Heathfield 2029S
PRC-005 - trip coil testing - breaker 1219 at 2029S		 50 Hours
Continuous		  
15-Jun-26 10:00 15-Jun-26 11:59 ATCO Outage 849s 902 (849s Joslyn Creek) PRC-005 trip coil testing 1.98 Hours
Continuous		  
15-Jun-26 10:30 18-Jun-26 16:30 ALTALINK Outage 704L (51s Wainwright - 478s Tucuman), 51s 704 (51s Wainwright), 478s 152 (478s Tucuman) transmission line maintenance 78 Hours
Continuous		  
15-Jun-26 11:00 19-Jun-26 17:00 ALTALINK Outage 1002L (163s Amoco Empress - 275s Jenner), 163s 1752 (163s Amoco Empress), 163s 1552 (163s Amoco Empress), 163s Protection & Control (163s Amoco Empress) replace 163s1752 breaker CT at 163s Amoco 102 Hours
Continuous		  
15-Jun-26 12:00 15-Jun-26 13:59 ATCO Outage 849s 903 (849s Joslyn Creek) PRC-005 trip coil testing 1.98 Hours
Continuous		  
15-Jun-26 12:00 15-Jun-26 13:00 ATCO, ALTALINK Outage 7L114 (72s Leismer - 7LA114 tap), 7L114 (907s Waddell - 7LA114 tap) emergency outage on T2 at 72S Leismer to replace H1 bushing 196 Hours
Continuous		  
15-Jun-26 12:00 20-Jun-26 12:30 ALTALINK Outage 72s T2 (72s Leismer), 72s 1052 (72s Leismer), 72s C1 (72s Leismer), 72s C2 (72s Leismer), 72s 31 (72s Leismer) urgent H1 bushing replacement
120.5 Hours
Continuous		  
15-Jun-26 12:30 18-Jun-26 17:00 ALTALINK Outage 198s T1 (198s Blackfalds) transformer maintenance, doble, IDD wiring repair & tap changer major maintenance 76.5 Hours
Continuous		  
15-Jun-26 13:00 16-Jun-26 13:00 ATCO Outage 780s 703 (780s Lubicon) replace two densimeters 24 Hours
Continuous		  
15-Jun-26 13:00 17-Jun-26 16:30 ALTALINK Outage 71s 252 (71s Lamoureux) 138kV breaker maintenance 51.5 Hours
Continuous		  
15-Jun-26 13:00 18-Jun-26 16:30 ALTALINK TE 245s Protection & Control (245s Seebe) 245s10 CT replacement
 75.5 Hours
Continuous		  
15-Jun-26 14:00 15-Jun-26 15:59 ATCO Outage 849s 905 (849s Joslyn Creek) PRC-005 trip coil testing 1.98 Hours
Continuous		  
16-Jun-26 06:00 16-Jun-26 10:00 ALTALINK Outage 77s 29 (77s Sagitawah) trip test (77s29) 4 Hours
Continuous		  
16-Jun-26 07:00 17-Jun-26 17:00 EPCOR Outage 4R T1 (A.T. Plastics 4R), ATP1381 (A.T. Plastics 4Rs), 5R T3 (A.T. Plastics 5Rs), ATP1382 (A.T. Plastics 5Rs), ATPAB3 (A.T. Plastics 5Rs), ATPAB1 (A.T. Plastics 4Rs) AT Plastic: ATPAB2/ATPAB3 disconnect repairs (site outage) 34 Hours
Continuous		  
16-Jun-26 07:00 17-Jun-26 13:00 ALTALINK Outage 736L (38s East Edmonton - 293s Bernese), 293s T1 (293s Bernese), 293s T2 (293s Bernese), 38s 736E (38s East Edmonton), 293s 152 (293s Bernese), 293s 252 (293s Bernese) CT replacement on 38s736E breaker 30 Hours
Continuous		  
16-Jun-26 07:30 19-Jun-26 18:00 ALTALINK Outage 534s 138kV Bus 1 (534s Eckville), 758L (534s Eckville - 757L tap), 534s T1 (534s Eckville), 534s 758 (534s Eckville), 534s 40 (534s Eckville) Str 4: replace arms insulators
Str 13 replace str
Str 21 replace str single pole tangent
Str 40: change single pole tangent.
Str 38,39 arm changes
82.5 Hours
Continuous		  
16-Jun-26 07:30 16-Jun-26 17:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) HOP to remove slack span from 7LA760-3 at the 7LA760 end of the 7L760/7LA760 junction temporary bypass 10 Hours
Daily		  
16-Jun-26 08:00 16-Jun-26 16:00 ENMAX Outage 24.81L (SS-24 - SS-31), 31B138-24.81 (SS-31) shield wire replacement 8 Hours
Continuous		  
16-Jun-26 08:00 16-Jun-26 16:00 ENMAX Outage 13.82L (SS-13 - SS-22), 22.1TR (SS-22), 22B138-13.82 (SS-22) maintenance on SW 82 @ 22 Sub 8 Hours
Continuous		  
16-Jun-26 08:00 16-Jun-26 20:00 SUNCOR TE 29PL9-15 (29EDD-34 - 29EDD-56) 29PL9-15 (PML7550) comm failure require meter replacement 12 Hours
Continuous		  
16-Jun-26 08:00 16-Jun-26 16:00 ALTALINK TE AltaLink Telecom Equipment end-to-end testing of radio to ensure radio functionality is in place 8 Hours
Continuous		  
16-Jun-26 08:00 16-Jun-26 16:00 ALTALINK TE 275s RTU/SCADA (275s Jenner) techs to complete work on IRIG clock to fix a cycling alarms 8 Hours
Continuous		  
16-Jun-26 08:00 18-Jun-26 16:00 ENMAX Outage 39.4TR (SS-39) relay protection test 56 Hours
Continuous		  
16-Jun-26 08:00 16-Jun-26 16:00 ENMAX Outage 9.3TR (SS-9) take measurements in the secondary cabinet 8 Hours
Continuous		  
16-Jun-26 09:00 26-Jun-26 17:00 ATCO, ALTALINK Outage 972s 902 (972s Tinchebray), 972s 903 (972s Tinchebray), 9L86 (87s Gaetz - 972s Tinchebray) connect new 9L86 to 972S and prepare to energize, complete protection commissioning 224 Hours
Continuous		  
16-Jun-26 09:00 19-Jun-26 15:00 ATCO Outage 800s 702T (800s Friedenstal) transformer class2 major testing 78 Hours
Continuous		  
16-Jun-26 09:00 25-Jun-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) commission both 21A and 21B relays for 9L86 during the line outage 224 Hours
Continuous		  
16-Jun-26 09:00 16-Jun-26 13:30 ALTALINK, BCH TE 5L94 (BCH Cranbrook - 520s Bennett) CBK 5L94 Protection/NIC RAS controller 4.5 Hours
Continuous		 AB-BC
16-Jun-26 10:00 16-Jun-26 11:59 ATCO Outage 849s 906 (849s Joslyn Creek) PRC-005 trip coil testing 1.98 Hours
Continuous		  
16-Jun-26 10:01 16-Jun-26 13:00 ALTALINK Outage 77s 40 (77s Sagitawah) trip test (77s40) 2.98 Hours
Continuous		  
16-Jun-26 12:00 16-Jun-26 13:59 ATCO Outage 849s 907 (849s Joslyn Creek) PRC-005 trip coil testing 1.98 Hours
Continuous		  
16-Jun-26 12:00 16-Jun-26 18:00 ALTALINK, ATCO Outage 77s 57 (77s Sagitawah), 939L (77s Sagitawah - 809s Louise Creek) trip test (77s57) 6 Hours
Continuous		  
16-Jun-26 13:01 18-Jun-26 13:00 ATCO Outage 780s 705 (780s Lubicon) breaker SF6 LTB145D1/B complete testing 47.98 Hours
Continuous		  
16-Jun-26 13:31 16-Jun-26 17:00 ALTALINK, BCH TE 5L94 (BCH Cranbrook - 520s Bennett) CBK 5L94 Protection/NIC RAS controller
3.48 Hours
Continuous		 AB-BC
17-Jun-26 07:00 24-Jun-26 17:00 EPCOR Outage 987s GT3 (987s Clover Bar), 987s CGB3 (987s Clover Bar) maintenance 178 Hours
Continuous		  
17-Jun-26 07:00 18-Jun-26 16:00 ENMAX Outage B138-94 (SS-1), B138-95 (SS-1), MD138_107 (SS-1), MD138_108 (SS-1) 1 sub transmission line cut over. commissioning 33 Hours
Continuous		  
17-Jun-26 08:00 17-Jun-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 332s RTU/SCADA (332s Ellis) 2026 firewall program - 1 firewall, 1 MPLS node 80 Hours
Continuous		  
17-Jun-26 08:00 18-Jun-26 17:00 ALTALINK Outage 870L (262s Rocky Mountain House - 263s Strachan), 262s 870W (262s Rocky Mountain House), 263s 870E (263s Strachan) replacing structure 12 and replacing cross arms and insulators on structure 13
33 Hours
Continuous		  
17-Jun-26 08:00 17-Jun-26 16:00 ALTALINK TE AltaLink Telecom Equipment 28s West Brooks MPLS 7705A 1/1/8 Low Rx, test fiber, patch panel ports and MPLS SFP's 8 Hours
Continuous		  
17-Jun-26 08:00 18-Jun-26 16:00 ENMAX Outage 38.3TR (SS-38) take measurements in secondary cabinet, test secondary CT 32 Hours
Continuous		  
17-Jun-26 08:00 18-Jun-26 16:00 ENMAX Outage 22B138-13.82 (SS-22) breaker maintenance 32 Hours
Continuous		  
17-Jun-26 08:00 17-Jun-26 16:00 ALTALINK TE 48s Protection & Control (48s Pocaterra) 887L B21/67N/L2 URD60, techs to complete settings change on the listed protection
8 Hours
Continuous		  
17-Jun-26 08:30 18-Jun-26 16:00 ALTALINK TE 895s Protection & Control (895s Suffield) relay PRC005 maintenance (6yr compliance) and prep work for 2272L metering equipment upgrade 31.5 Hours
Daily		  
17-Jun-26 09:00 17-Jun-26 10:00 ATCO TE ATCO Telecom Equipment, 768s RTU/SCADA (768s Rowley) Rowley_S-Telecom-upgrade Rowley substation SAR OS TO V21, then N V22 1 Hour
Continuous		  
17-Jun-26 09:00 17-Jun-26 13:30 ALTALINK, BCH TE 1L275 (799s Coleman - BCH Natal), 1L274 (BCH Natal - BCH Line Creek tap) NIC RAS PLC PY OOS 4.5 Hours
Continuous		 AB-BC
17-Jun-26 09:00 17-Jun-26 16:00 ALTALINK, BHE, BHE Canada Outage MATL (120s Picture Butte - Montana), 120s 1052 (120s Picture Butte) emergency maintenance outage 7 Hours
Continuous		 AB-MATL
17-Jun-26 09:30 20-Jun-26 17:30 ATCO Outage 6L21 tap xfmr testing 80 Hours
Continuous		  
17-Jun-26 09:30 17-Jun-26 10:59 ATCO Outage 856s 701 (856s Kinosis) PRC-005 trip coil testing 1.48 Hours
Continuous		  
17-Jun-26 10:00 18-Jun-26 16:00 ATCO Outage 700s 706C (700s Bonnyville), 700s 706 (700s Bonnyville) test ASEA IMBD CT 30 Hours
Continuous		  
17-Jun-26 11:00 17-Jun-26 12:29 ATCO Outage 856s 703 (856s Kinosis) PRC-005 trip coil testing 1.48 Hours
Continuous		  
17-Jun-26 12:30 17-Jun-26 13:59 ATCO Outage 856s 704 (856s Kinosis) PRC-005 trip coil testing 1.48 Hours
Continuous		  
17-Jun-26 13:00 19-Jun-26 17:30 ATCO Outage 2029s ACF14 (2029s Heathfield), 2029s 1221 (2029s Heathfield) filter bank maintenance 52.5 Hours
Continuous		  
17-Jun-26 13:31 17-Jun-26 17:00 ALTALINK, BCH TE 1L275 (799s Coleman - BCH Natal), 1L274 (BCH Natal - BCH Line Creek tap) NIC RAS PLC SY OOS 3.48 Hours
Continuous		 AB-BC
17-Jun-26 14:00 17-Jun-26 15:29 ATCO Outage 856s 705 (856s Kinosis) PRC-005 trip coil testing 1.48 Hours
Continuous		  
18-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE AltaLink Telecom Equipment troubleshoot and replace defective radio components, end-to-end testing required after radio is repaired 8 Hours
Continuous		  
18-Jun-26 08:00 18-Jun-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D87 protection outage, relays, lockout testing 8 Hours
Continuous		  
18-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 281s RTU/SCADA (281s Johnson) configure push on the RTU to add more SCADA points 8 Hours
Continuous		  
18-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE AML 511s RTU/SCADA (AML 511s Crossings) update the RTU/HMI configuration for the new intrusion alarms to meet the compliance 8 Hours
Continuous		  
18-Jun-26 08:00 18-Jun-26 16:00 ENMAX Outage 36.2TR (SS-36) center & east 138KV LA hot spot - change LA's 8 Hours
Continuous		  
18-Jun-26 08:30 18-Jun-26 17:00 ALTALINK TE 895s RTU/SCADA (895s Suffield) upgrade 2272L Meter module 8.5 Hours
Daily		  
18-Jun-26 09:00 18-Jun-26 16:00 ATCO TE ATCO Telecom Equipment Salt Creek_S-Telecom/Thickwood Hills_S-Telecom- Radio Major IRU link Salt Creek to Thickwood 7 Hours
Continuous		  
18-Jun-26 09:00 18-Jun-26 15:00 ALTALINK TE 42s RTU/SCADA (42s Sarcee), AltaLink Telecom Equipment firewall replacement, MPLS 7705 A&B upgrade, raw socket upgrade, LAN switch replacement 80 Hours
Continuous		  
18-Jun-26 09:00 19-Jun-26 17:00 BCH RB 5L91 (BCH Ashton Creek - BCH Selkirk) 5L91 AR turned off 32 Hours
Continuous		 AB-BC
19-Jun-26 07:00 20-Jun-26 18:00 ALTALINK Outage 185L (379s Shell Canada Waterton - 396s Pincher Creek), 379s 185N (379s Shell Canada Waterton), 396s 185 (396s Pincher Creek) replacing cross arms and insulators 35 Hours
Continuous		  
19-Jun-26 08:00 19-Jun-26 16:00 ENMAX, ALTALINK Outage 693L (42s Sarcee - SS-10), 10B138-693 (SS-10), 42s 693 (42s Sarcee) sf6 gas sample, switch adjustment 8 Hours
Continuous		  
19-Jun-26 08:00 19-Jun-26 10:00 ENMAX Outage 2.2TR (SS-2) summer substation washing. reversing switch check - 2.2-TC 2 Hours
Continuous		  
19-Jun-26 08:00 19-Jun-26 16:00 ENMAX, ALTALINK IO 693L (42s Sarcee - SS-10) breaker SF6 gas sample - 10B138-693 8 Hours
Continuous		  
19-Jun-26 09:00 25-Jun-26 17:00 BCH Outage 2L294 (BCH A. A. Lambert - BCH Cranbrook) maintenance 152 Hours
Continuous		 AB-BC
19-Jun-26 10:00 19-Jun-26 12:00 ENMAX Outage 2.3TR (SS-2) summer substation washing, reversing switch check - 2.3-TC 2 Hours
Continuous		  
19-Jun-26 12:00 19-Jun-26 16:00 ENMAX Outage 2.4TR (SS-2) summer substation washing, reversing switch check, bushing oil sampling 4 Hours
Continuous		  

Prepared On:   2026-06-12   16:18:25

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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