Alberta Electric System Operator
System Co-ordination Plan
2026-10-08 to 2026-10-16
Approved Outages

Previous Version
Download CSV

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 04-Nov-26 15:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 14,264 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 28-Oct-26 20:00 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 13-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		  
01-May-26 17:00 19-Feb-27 17:00 EPCOR Outage T1 (Meadowlark) T1 LCR civil work 4,993 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 03-Nov-26 18:00 ACCIONA, ENBRIDGE, ICPCL Outage 139s C1 (139s Hillridge) forced outage 3,577.92 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 08:00 22-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 22-Oct-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		  
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		  
10-Aug-26 07:30 09-Oct-26 17:00 ALTALINK Outage 434s T3 (434s East Stony Plain) T3 transformer replacement 1,281.5 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		  
02-Sep-26 07:00 21-Oct-26 15:00 ALTALINK, TRANSALTA Outage 320p GT3 (320p Keephills) maintenance 1,184 Hours
Continuous		  
08-Sep-26 07:00 18-Dec-26 17:00 EPCOR TE EP 803s Protection & Control (EP 803s Lambton) protection blocking, DFR upgrade cutovers and commissioning 2,435 Hours
Continuous		  
08-Sep-26 08:00 13-Nov-26 17:00 ALTALINK, REDDEER Outage 464L (87s Gaetz - 209s Timberlands), 209s 464E (209s Timberlands) P&C panel replacements, 138 kV bus and line arrestor testing, transformer testing 1,594 Hours
Continuous		  
08-Sep-26 09:00 13-Nov-26 17:00 ALTALINK, REDDEER Outage 768L (209s Timberlands - 217s North Red Deer), 209s T1 (209s Timberlands), 217s 768 (217s North Red Deer), 209s 768W (209s Timberlands) P&C panel replacements, 138 kV bus and line arrestor testing, transformer testing 1,593 Hours
Continuous		  
12-Sep-26 08:00 27-Nov-26 16:00 SUNCOR Outage 29EDD-18 29PT-100 (29EDD-18 Firebag) replace secondary cables on 29PT-100 1,833 Hours
Continuous		  
14-Sep-26 08:00 17-Dec-26 17:00 ATCO TE 738s RTU/SCADA (738s Virginia Hills), 738s Protection & Control (738s Virginia Hills) SCADA/protection upgrade at 738s Virginia Hills, cut over to the new SCADA system and tested 2,266 Hours
Continuous		  
14-Sep-26 21:53 31-Dec-26 23:59 NWE Outage 2375 (NWE Marias) breaker hydraulic oil pump repeatedly 2,595.1 Hours
Continuous		 AB-MATL
15-Sep-26 11:00 05-Nov-26 19:00 ATCO TE 888s RTU/SCADA (888s Dover) RTU updates for 9L74 protection upgrade 1,233 Hours
Continuous		  
21-Sep-26 08:00 09-Oct-26 16:00 ALTALINK TE 281s RTU/SCADA (281s Johnson) SCADA configuration updates involving 417L protection upgrades for 55s P&C major project 440 Hours
Daily		  
21-Sep-26 09:00 22-Oct-26 08:00 ALTALINK Outage 417L (55s Olds - 281s Johnson), 281s 1152 (281s Johnson), 281s 1252 (281s Johnson), 55s 417 (55S Olds) upgrade 417L protections at 281s. 743 Hours
Continuous		  
21-Sep-26 10:00 30-Oct-26 14:00 ATCO Outage 706s 701T (706s Irish Creek), 706s 701 (706s Irish Creek) breaker, transformer and voltage regulator maintenance 268 Hours
Continuous		  
21-Sep-26 11:00 09-Oct-26 19:00 ATCO TE 888s Protection & Control (888s Dover) block 21B with new relay and block 9L74 RAS B 440 Hours
Continuous		  
22-Sep-26 09:00 19-Oct-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) CSP needed for 86-94/700BS1 to test protection logic for breaker 702 656 Hours
Continuous		  
22-Sep-26 09:00 19-Oct-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 21B/7L67 relay testing and wiring 656 Hours
Continuous		  
22-Sep-26 09:00 19-Oct-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 50BF/702 relay testing and wiring 656 Hours
Continuous		  
22-Sep-26 17:45 09-Oct-26 00:00 SUNCOR Outage 29PL6-7 (30EDD-1 - 29EDD-5) 29PL6-7 (30EDD-1 - 29EDD-5) forced outage 390.25 Hours
Continuous		  
23-Sep-26 08:00 09-Oct-26 17:00 ATCO RB 12L44 (939s Livock - 951s Thickwood Hills) installing replacement corona rings on 12L44 due to failure, replacement warranty 393 Hours
Continuous		  
23-Sep-26 12:00 19-Oct-26 11:00 ATCO Outage 7L67 (743s Sarah Lake - 824s Fieldgate), 743s 702 (743s Sarah Lake), 743s 702A (743s Sarah Lake) 743S Sarah lake rebuild. replace bkr 702, gang switches 702A, 7L67D2 623 Hours
Continuous		  
24-Sep-26 08:00 11-Oct-26 18:00 SUNCOR Outage 29PL7-2 (29EDD-18 Firebag - 29EDD-63), 29EDD-63 29PT-179 (29EDD-63 Firebag Co-Gen), 29EDD-63 30-252-11301 (29EDD-63), 29EDD-63 91-152-500201 (29EDD-63), 29EDD-18 29-752-105 (29EDD-18 Firebag), 29EDD-18 29-752-104 (29EDD-18 Firebag) replace air bladder and 29PT-179 T60 replacement 418 Hours
Continuous		  
26-Sep-26 08:00 08-Oct-26 17:00 ATCO TE 888s Protection & Control (888s Dover) tie in single phase PT voltage from 9L09PTX2 into new 21B/9L74, block 21A/9L09 before performing the injection 297 Hours
Continuous		  
26-Sep-26 09:00 08-Oct-26 16:00 ATCO Outage 7L90 (813s Little Smoky - 7LA90 tap) 7L90 pole replacement 295 Hours
Continuous		  
28-Sep-26 07:00 08-Oct-26 17:00 ALTALINK Outage 1325L (510s Sunnybrook - AML 511s Crossings), 510s T11 (510s Sunnybrook), AML 511s T11 (AML 511s Crossings), 510s 2652 (510s Sunnybrook), 510s 2752 (510s Sunnybrook), AML 511s 4852 (AML 511s Crossings), AML 511s 4952 (AML 511s Crossings), 510s 43 (510s Sunnybrook), 510s 44 (510s Sunnybrook), 510s 4289 (510s Sunnybrook), 510s 41 (510s Sunnybrook), AML 511s 76 (AML 511s Crossings), AML 511s 74 (AML 511s Crossings), AML 511s 1489 (AML 511s Crossings) annual valve hall maintenance, prc tx maintenance, doble testing of the transformers, prc relay maintenance, annual yard inspections, tdc settings changes, vcs maintenance 250 Hours
Continuous		  
28-Sep-26 07:00 31-Dec-26 17:00 EPCOR Outage 816s T1 (816s Petrolia) emergency outage - tap changer gassing 2,267 Hours
Continuous		  
28-Sep-26 10:00 08-Oct-26 17:30 ATCO TE 2075s Protection & Control (2075s Newell) relay upgrade 223.5 Hours
Continuous		  
28-Sep-26 11:00 09-Oct-26 17:00 ATCO TE 960s Protection & Control (960s Birchwood Creek) change setting on 21B/9L74 for Armistead substation 270 Hours
Continuous		  
28-Sep-26 11:00 30-Oct-26 19:00 ATCO TE 960s RTU/SCADA (960s Birchwood Creek) updates to RTU for 9L74 776 Hours
Continuous		  
28-Sep-26 12:00 15-Oct-26 17:00 ALTALINK, Lethbridge Outage 725L (674s Bowron - 725BL tap), 674s 725W (674s Bowron), 674s 1 (674s Bowron), 674s T1 (674s Bowron) OE outage on 725lw required to replace 674s1-disconnect switch, 674sPT4-CVT, 674sPTB2-3phase CVT's 413 Hours
Continuous		  
28-Sep-26 12:05 15-Oct-26 17:00 ALTALINK, Lethbridge IO 725L (674s Bowron - 725BL tap) City of Lethbridge outage on 725lw required to replace 674s1-Disconnect Switch, 674sPT4-CVT, 674sPTB2-3phase CVT's 412.92 Hours
Continuous		  
30-Sep-26 09:00 09-Oct-26 20:00 SUNCOR TE Suncor RTU/SCADA (Suncor) cleaning, inspection and repair 227 Hours
Continuous		  
03-Oct-26 07:00 16-Oct-26 17:00 ALTALINK Outage 422s 700 (422s Westwood), 746s 700N (746s Sherwood Park), 700L (422s Westwood - 746L tap), 700L (746s Sherwood Park - 746L tap) replacement of cross arms and insulators and other minor component replacements 322 Hours
Continuous		  
03-Oct-26 08:00 09-Oct-26 16:00 Syncrude IO 19215 (Syncrude Mildred Lake) maintenance 152 Hours
Continuous		  
03-Oct-26 12:30 20-Oct-26 12:00 ENMAX Outage 1.81L (SS-1 - SS-20), 20B138-1.81 (SS-20) construction 1.81L river crossing, drill north side, set both sides and string 407.5 Hours
Continuous		  
04-Oct-26 12:00 06-Nov-26 18:00 ENMAX Outage 8.6TR (SS-8) fire alarm system upgrade 799 Hours
Continuous		  
05-Oct-26 06:00 09-Oct-26 19:00 ALTALINK RB 610L (83s Taber - 336s Fincastle) install temporary understrung line, stringing wire 109 Hours
Daily		  
05-Oct-26 07:00 10-Oct-26 17:00 EPCOR Outage M724 (Meadowlark) M724 breaker maintenance and CT doble 130 Hours
Continuous		  
05-Oct-26 07:00 09-Oct-26 17:00 EPCOR Outage R721 (Rossdale) R721 breaker fail and DFR cutovers and commissioning 106 Hours
Continuous		  
05-Oct-26 07:30 09-Oct-26 15:30 CMH, ALTALINK Outage MH-15L (MHS-7 Brier Park - MHS-9 South Saskatchewan), 882L (MHS-7 Brier Park - 321s Al Rothbauer), MH-6L (MHS-1 CMH Power Plant - MHS-9 South Saskatchewan), MHS-7 138-T71 (MHS-7 Brier Park), MHS-9 MH138-T11 (MHS9 Power Plant), MHS-7 MH138-702 (MHS-7 Brier Park), MHS-7 MH138-707 (MHS-7 Brier Park), 321s 252 (321s Al Rothbauer) replacement of CTs, breaker maintenance MH138-702, MH138-707
disconnect switch maintenance 		104 Hours
Continuous		  
05-Oct-26 07:30 09-Oct-26 15:30 ALTALINK, CMH Outage 882L (MHS-7 Brier Park - 321s Al Rothbauer) city of medicine hat CT work 104 Hours
Continuous		  
05-Oct-26 08:00 28-Nov-26 19:00 ALTALINK Outage 62s T2 (62s Brazeau Plant), 62s 2 (62s Brazeau Plant) maintenance 1,295 Hours
Continuous		  
05-Oct-26 08:00 09-Oct-26 16:00 ALTALINK TE 58s RTU/SCADA (58s Edson) RTU/HMI configuration 104 Hours
Daily		  
05-Oct-26 08:00 15-Oct-26 16:00 ALTALINK Outage 443L (55s Olds - 214s Innisfail), 214s 443 (214s Innisfail), 55s 443 (55S Olds) update line protections for 443L 248 Hours
Continuous		  
05-Oct-26 08:00 18-Oct-26 19:00 ATCO RB 13L50 (2029s Heathfield - 2075s Newell) installing SVDs from str 1-775, then 975-1387 323 Hours
Continuous		  
05-Oct-26 08:00 09-Oct-26 16:00 ENMAX Outage 31.84L (SS-31 - SS-32), 31B138-31.84 (SS-31), 32B138-31.84 (SS-32) installation of new surge arrestors 104 Hours
Continuous		  
05-Oct-26 08:00 08-Oct-26 16:00 ATCO Outage 7L44 (749s Flyingshot Lake - 845s Big Mountain) changing str 71,72,73 and 74 for high load move line raise 80 Hours
Continuous		  
05-Oct-26 08:00 09-Oct-26 16:00 ALTALINK TE 133s Protection & Control (133s Stelco Edmonton) 133s T2 protection settings change 104 Hours
Daily		  
05-Oct-26 08:00 15-Oct-26 16:00 ALTALINK TE 431s RTU/SCADA (431s Hussar) new alarms and SCADA metering for C1 protection 248 Hours
Daily		  
05-Oct-26 08:00 09-Oct-26 16:00 ALTALINK TE 428s RTU/SCADA (428s Namaka) HMI upgrade & T1 tap control testing 104 Hours
Daily		  
05-Oct-26 08:30 08-Oct-26 16:00 ATCO Outage 9L74 (888s Dover - 960s Birchwood Creek), 888s 905 (888s Dover), 888s 906 (888s Dover), 960s 901 (960s Birchwood Creek), 960s 902 (960s Birchwood Creek), 888S 916D1 (888s Dover), 888S 9L74D2 (888s Dover), 960s 9L74D1 (960s Birchwood Creek) 21B/9L74 relay three terminal line testing 78 Hours
Continuous		  
05-Oct-26 09:00 16-Oct-26 17:00 BCH, BPA Outage 5L52 (BPA Custer - BCH Ingledow) 5L52 tower replacements 272 Hours
Continuous		 AB-BC
05-Oct-26 10:00 16-Oct-26 17:30 ATCO Outage 6L09 (767s Oyen - 6L21 tap), 7L760 (767s Oyen - 7LC760 tap), 767s Oyen leak repairs on 701T, breaker testing, transformer testing, and switch repairs
271.5 Hours
Continuous		  
05-Oct-26 10:00 08-Oct-26 16:00 ALTALINK TE 133s RTU/SCADA (133s Stelco Edmonton) 5G telecom install project, RTU changes required for 5G upgrade 78 Hours
Daily		  
05-Oct-26 11:00 08-Oct-26 12:00 ALTALINK Outage 359s T1 (359s Esso West Pembina) T1/LTC maintenance, oil leak repairs & LTC filter piping install 73 Hours
Continuous		  
05-Oct-26 11:00 16-Oct-26 16:00 ALTALINK TE 478s RTU/SCADA (478s Tucuman) RTU database update 269 Hours
Daily		  
05-Oct-26 11:00 10-Oct-26 19:00 ATCO Outage 13L50L2 (2029s Heathfield - 2075s Newell) emergency repair OHSW at strs 986, 1132, 1303, 1305, 1332 128 Hours
Continuous		  
05-Oct-26 11:30 09-Oct-26 18:00 ALTALINK RB 723L (438s Westlock - 724L tap), 723L (69s North Barrhead - 724L tap), 724L (500s Flatbush - 724L tap), 724L (723L tap - 724AL tap) 724L replace Structure 27, replace arms and insulation at structures 7, 49, 54, 58, 208, 211, 219, 223, 252 102.5 Hours
Daily		  
05-Oct-26 12:00 16-Oct-26 12:00 ATCO Outage 786s SVC (786s High Level), 786s 703T (786s High Level), 786s 703 (786s High Level) ET 1136310 786S High Level SVC DFR upgrade
96 Hours
Continuous		  
05-Oct-26 12:00 16-Oct-26 12:00 ATCO TE 786s RTU/SCADA (786s High Level) ET 1136310 786S high level SVC DFR upgrade 264 Hours
Continuous		  
05-Oct-26 13:00 08-Oct-26 18:00 ALTALINK, EPCOR Outage 908L (89s Ellerslie - 816s Petrolia), 908L (89s Ellerslie - 908AL tap), 89s 852 (89s Ellerslie), 89s 652 (89s Ellerslie), 89s 752 (89s Ellerslie) breaker maintenance 89s852 and switch maintenance 89s12, 89s13 77 Hours
Continuous		  
05-Oct-26 13:00 08-Oct-26 16:00 ALTALINK, EPCOR RB 908L (89s Ellerslie - 816s Petrolia) reclose blocking for Altalink working on Ellerslie 89S 75 Hours
Continuous		  
06-Oct-26 07:00 09-Oct-26 17:00 EPCOR Outage 72VN21 (EP 511s Victoria - Namao) VN21/125 ave: surge arrestor LCR 82 Hours
Continuous		  
06-Oct-26 08:00 08-Oct-26 17:00 ALTALINK TE AltaLink Telecom Equipment MW upgrade at the hop between 9244R Bowmanton radio and 9997R Schuler radio 57 Hours
Continuous		  
06-Oct-26 08:00 09-Oct-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 993s RTU/SCADA (993s Abee) MPLS node upgrade & maintenance 81 Hours
Daily		  
06-Oct-26 08:00 08-Oct-26 16:00 ALTALINK TE AltaLink Telecom Equipment MW upgrade at the hop between 9997R Schuler Radio and 562S Cypress 56 Hours
Continuous		  
06-Oct-26 08:00 15-Oct-26 17:00 ATCO TE 875s RTU/SCADA (875s Algar), 875s Protection & Control (875s Algar) site de energized 225 Hours
Continuous		  
06-Oct-26 08:00 08-Oct-26 17:00 ALTALINK Outage 431s C1 (431s Hussar) urgent 431sC1 trouble investigation and repair 57 Hours
Continuous		  
06-Oct-26 10:00 09-Oct-26 16:00 ATCO TE 951s RTU/SCADA (951s Thickwood Hills) relay software vulnerability patching 78 Hours
Continuous		  
07-Oct-26 08:00 28-Oct-26 16:00 Syncrude Outage Mildred Lake 72kV Bus B (Sycrude Mildred Lake), ML1 (D05 - Syncrude Mildred Lake), Mildred T1 (Syncrude Mildred Lake), Mildred T2 (Syncrude Mildred Lake), Mildred T3 (Syncrude Mildred Lake), Mildred T16 (Syncrude Mildred Lake), Mildred T19 (Syncrude Mildred Lake), Mildred T14 (Syncrude Mildred Lake), 135 (Syncrude Mildred Lake), 2235 (Syncrude Mildred Lake), 1335 (Syncrude Mildred Lake), 235 (Syncrude Mildred Lake), 3235 (Syncrude Mildred Lake), 335 (Syncrude Mildred Lake), 1935 (Syncrude Mildred Lake), 1635 (Syncrude Mildred Lake), 1435 (Syncrude Mildred Lake), 915 (Syncrude Mildred Lake), 815 (Syncrude Mildred Lake), 1225 (Syncrude Mildred Lake), D05 76 (D05), 1934 (Syncrude Mildred Lake), 1434 (Syncrude Mildred Lake), 334 (Syncrude Mildred Lake), 814 (Syncrude Mildred Lake), 134 (Syncrude Mildred Lake), 816 (Syncrude Mildred Lake), 1634 (Syncrude Mildred Lake), 234 (Syncrude Mildred Lake) bus maintenance 512 Hours
Continuous		  
07-Oct-26 08:00 08-Oct-26 16:00 ALTALINK TE 338s RTU/SCADA (338s Cherhill) techs to complete firmware upgrade and configuration changes on the RTU for fault reporting implementation. 32 Hours
Continuous		  
07-Oct-26 08:00 08-Oct-26 16:00 ALTALINK TE 338s Protection & Control (338s Cherhill) redundant relays will be removed from service 1 at a time to implement fault reporting settings change / testing: 913L A21/L1, 1046L A21/79/L3 32 Hours
Daily		  
07-Oct-26 08:30 08-Oct-26 16:00 ALTALINK TE 324s Protection & Control (324s Cassils) firmware update/testing on 1088L A87/21/L12 URL90 31.5 Hours
Continuous		  
07-Oct-26 09:00 08-Oct-26 17:00 ATCO TE 879s Scotford Upgrader RTU/SCADA, 850s RTU/SCADA (850s Rainbow Cogen), 798s RTU/SCADA (798s Bridge Creek), ATCO Telecom Equipment Vegreville_T(SCC)-telecom- MPLS life cycle upgrades to SAR A. Prep on Oct 7 Cut over Oct 8 between 10am-2pm. impact :#134 RAS A (disabled), scada at 850s, Weyerhaeuser, 879s, 798s, 32 Hours
Continuous		  
07-Oct-26 15:00 15-Oct-26 17:00 ALTALINK Outage 431s 152 (431s Hussar), 431s C1 (431s Hussar) new cap bank protection 194 Hours
Continuous		  
07-Oct-26 16:00 13-Oct-26 09:00 ALTALINK Outage 431s 195 (431s Hussar), 431s T1 (431s Hussar) full meter replacement, install new bird cover 137 Hours
Continuous		  
08-Oct-26 06:00 12-Oct-26 18:00 SUNCOR Outage 635PL7-1000 (635EDD-1000 - 635EDD-1001), 635EDD-1001 635-752-621 (635EDD-1001), 635EDD-1001 635-752-622 (635EDD-1001), 635EDD-1001 635PS-1108 (635EDD-1001), 635EDD-1000 635PS-1036 (635EDD-1000) Fort Hills: maintenance 108 Hours
Continuous		  
08-Oct-26 07:00 08-Oct-26 18:00 ALTALINK Outage 202L (61s Lodgepole - 62s Brazeau Plant), 61s 202X (61s Lodgepole), 62s 202 (62s Brazeau Plant) line maintenance and high load move 11 Hours
Continuous		  
08-Oct-26 07:00 08-Oct-26 17:00 ALTALINK Outage 428s T2 (428s Namaka), 428s 652 (428s Namaka) T2 outage required to add & test tap changer raise/lower controls 10 Hours
Continuous		  
08-Oct-26 07:30 08-Oct-26 13:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) HOP required for installing interphase spacers on 7L760 live line 6 Hours
Daily		  
08-Oct-26 08:00 08-Oct-26 13:00 ATCO RB 7L760 (767s Oyen - 7LC760 tap) HOP required for installing interphase spacers on 7L760 live line 5 Hours
Continuous		  
08-Oct-26 08:00 08-Oct-26 12:00 ENMAX Outage 162B240-RB131 (SS-162) breaker trip circuit test - 162B240-RB131 4 Hours
Continuous		  
08-Oct-26 08:00 15-Oct-26 17:00 ATCO, ALTALINK RB 12L41 (510s Sunnybrook - 939s Livock) installing replacement corona rings on 12L44 due to failure 177 Hours
Continuous		  
08-Oct-26 08:00 08-Oct-26 17:00 ALTALINK TE 170s RTU/SCADA (170s Pike), AltaLink Telecom Equipment telecom upgrade 9 Hours
Daily		  
08-Oct-26 08:00 15-Oct-26 17:00 ATCO, ALTALINK RB 12L41 (510s Sunnybrook - 939s Livock) ATCO - installing replacement corona rings on 12L44 due to failure, replacement warranty 177 Hours
Daily		  
08-Oct-26 08:00 08-Oct-26 17:00 ATCO TE 700s RTU/SCADA (700s Bonnyville) Bonnyville- firewall firmware upgrade 9 Hours
Continuous		  
08-Oct-26 08:00 08-Oct-26 17:00 ATCO TE 934s RTU/SCADA (934s Black Fly) Blackfly- firewall firmware upgrade 9 Hours
Continuous		  
08-Oct-26 08:00 08-Oct-26 16:00 ALTALINK TE 320p Protection & Control (320P Keephills) Load Encroachment relay setting change, redundant protections in place at all times
Engineering has deemed that due to the line not being able to be loaded to its maximum capacity, without this settings change, there is risk that high loading on the line could cause an inadvertent trip		 8 Hours
Daily		  
08-Oct-26 09:00 08-Oct-26 17:00 ALTALINK TE 29s Protection & Control (29s Cascade) cutover of 54L protection alarms 8 Hours
Continuous		  
08-Oct-26 09:00 08-Oct-26 17:00 ALTALINK TE 177s RTU/SCADA (177s West Cascade) testing analogs on 105L to clean up SCADA deficiencies 8 Hours
Continuous		  
09-Oct-26 07:00 09-Oct-26 18:00 ALTALINK Outage 58s 202X (58s Edson), 202L (58s Edson - 178s Cynthia), 178s 202N (178s Cynthia) line maintenance 11 Hours
Continuous		  
09-Oct-26 08:00 09-Oct-26 16:00 ENMAX Outage 162B138-RB83 (SS-162) breaker trip circuit test, CT terminal block replacement 8 Hours
Continuous		  
09-Oct-26 08:00 09-Oct-26 17:00 ALTALINK TE 242s RTU/SCADA (242s Flat Lake) firmware update on SCADA equipment 9 Hours
Daily		  
09-Oct-26 09:00 13-Oct-26 15:00 ALTALINK Outage 58s 740X (58s Edson), 58s 202X (58s Edson), 202L (58s Edson - 178s Cynthia), 58s 9 (58s Edson), 740L (39s Bickerdike - 58s Edson), 58s 35 (58s Edson), 58s C1 (58s Edson), 58s T1 (58s Edson) replace risers, energize 58s T1, soak for 4 days 102 Hours
Continuous		  
09-Oct-26 09:00 09-Oct-26 10:00 ATCO, ALTALINK Outage 741s 702 (741s ATC Fox Creek), 7L199 (347s AML Fox Creek - 741s ATC Fox Creek) PRC-005 trip coil testing, breaker operation only, open-close-open-close 1 Hour
Continuous		  
09-Oct-26 09:00 09-Oct-26 10:00 ATCO, ALTALINK IO 199L (347s AML Fox Creek - 741s ATC Fox Creek) PRC-005 trip coil testing, breaker operation only, open-close-open-close
2 Hours
Daily		  
09-Oct-26 09:00 30-Oct-26 16:00 BCH RB 2L294 (BCH A. A. Lambert - BCH Cranbrook), 2L294 (BCH A. A. Lambert - BCH Nelway) tree removal 511 Hours
Continuous		 AB-BC
09-Oct-26 13:00 09-Oct-26 16:00 ATCO Outage 741s 705 (741s ATC Fox Creek), 741s 705C (741s Fox Creek) PRC-005 trip coil testing 3 Hours
Continuous		  
10-Oct-26 06:00 10-Oct-26 18:00 ENMAX Outage 1.81L (SS-1 - SS-20), 20.1TR (SS-20), 20.82L (SS-20 - SS-21), 20.3TR (SS-20) Spring Substation Washing. Reversing Switch Check. Building Soffit repair. 1.81L already out of service. 12 Hours
Continuous		  
10-Oct-26 07:00 19-Oct-26 17:00 EPCOR Outage 72PM25 (Poundmaker - Meadowlark), M726 (Meadowlark), PM721 (Poundmaker) PM25: Meadowlark TX1 Civil Works 226 Hours
Continuous		  
10-Oct-26 08:00 10-Oct-26 12:00 ENMAX Outage 38.83L (SS-38 - SS-39), 39.82L (SS-39 - SS-162), 39.3TR (SS-39), 39.1TR (SS-39) Fall Substation Washing 4 Hours
Continuous		  
10-Oct-26 08:30 14-Oct-26 17:30 ATCO RB 9L74 (888s Dover - 960s Birchwood Creek) contractor performing work near 9L74. 105 Hours
Continuous		  
10-Oct-26 12:01 10-Oct-26 18:00 ENMAX Outage 39.82L (SS-39 - SS-162), 39.2TR (SS-39), 22.81L (SS-22 - SS-39), 39.4TR (SS-39) fall substation washing 5.98 Hours
Continuous		  
11-Oct-26 08:00 11-Oct-26 12:00 ENMAX Outage 24.81L (SS-24 - SS-31), 31.84L (SS-31 - SS-32), 31.3TR (SS-31), 31.2TR (SS-31) Fall Substation Washing 4 Hours
Continuous		  
11-Oct-26 08:00 23-Nov-26 16:00 ENMAX Outage 32.1TR (SS-32) oil containment replacement 1,041 Hours
Continuous		  
11-Oct-26 12:01 11-Oct-26 18:00 ENMAX Outage 31.2TR (SS-31), 9.80L (SS-9 - SS-31), 31.1C (SS-31), 31.1TR (SS-31) fall substation washing 5.98 Hours
Continuous		  
12-Oct-26 07:00 15-Oct-26 17:00 ALTALINK RB 7L230 (69s North Barrhead - 888AL tap) ATCO climbing inspection 82 Hours
Daily		  
12-Oct-26 07:00 05-Nov-26 18:00 ALTALINK TE 304s RTU/SCADA (304s Shell Limestone) RTU configuration update 588 Hours
Daily		  
12-Oct-26 08:00 16-Oct-26 16:00 ENMAX Outage 24.81L (SS-24 - SS-31) Installation of new Surge Arrestors 104 Hours
Continuous		  
12-Oct-26 08:00 15-Oct-26 17:00 ATCO, ALTALINK RB 7L230 (743s Sarah Lake - 888AL tap) walk up and climbing inspection on 7L230 81 Hours
Continuous		  
12-Oct-26 08:00 30-Oct-26 16:00 ENMAX Outage 32.83L (SS-32 - SS-40), 32.1TR (SS-32), 26.81L (SS-26 - SS-32) 32 SUB 32.1TR Oil containment replacement. 440 Hours
Continuous		  
12-Oct-26 10:00 15-Oct-26 16:00 ATCO Outage 888s 906 (888s Dover) 21A/9L74 relay replacement. Cutover breaker and CT to new protection 78 Hours
Continuous		  
12-Oct-26 11:00 30-Oct-26 19:00 ATCO TE 888s Protection & Control (888s Dover) block 21A/9L74 for a new protection relay 440 Hours
Continuous		  
13-Oct-26 06:00 16-Oct-26 17:00 ALTALINK RB 610L (83s Taber - 336s Fincastle) install temporary understrung line and stringing wire 83 Hours
Daily		  
13-Oct-26 07:00 17-Oct-26 17:00 ATCO, ALTALINK Outage 962L (87s Gaetz - 972s Tinchebray), 986L (87s Gaetz - 972s Tinchebray), 972s 9L62D1 (972s Tinchebray), 972s 9L86D1 (972s Tinchebray) interphase spacer work using HEC with a helicopter 106 Hours
Continuous		  
13-Oct-26 07:00 17-Oct-26 17:00 ATCO, ALTALINK IO 9L62 (87s Gaetz - 972s Tinchebray), 9L86 (87s Gaetz - 972s Tinchebray) AltaLink request 106 Hours
Continuous		  
13-Oct-26 08:00 19-Oct-26 16:00 ATCO RB 7L12 (834s Wesley Creek - 7LA12 tap), 7L12 (780s Lubicon - 7LA12 tap) installing openers J1 and J2 152 Hours
Continuous		  
13-Oct-26 08:00 30-Oct-26 16:00 ALTALINK TE 163s Protection & Control (163s Amoco Empress) circuit cutovers 416 Hours
Daily		  
13-Oct-26 08:00 15-Oct-26 17:30 ALTALINK RB 775L (276s Prentiss - 535s Joffre) reclose blocks for 962L/986L work 57.5 Hours
Daily		  
13-Oct-26 08:00 15-Oct-26 17:30 ALTALINK RB 759L (87s Gaetz - 276s Prentiss) reclose block for 962L/986L Repairs 57.5 Hours
Daily		  
13-Oct-26 08:00 15-Oct-26 17:30 ALTALINK RB 793L (87s Gaetz - 535s Joffre) reclose blocks for 962L/986L work 57.5 Hours
Daily		  
13-Oct-26 08:00 15-Oct-26 17:30 ALTALINK RB 784AL (482s Haynes - 784L tap), 784L (332s Ellis - 784AL tap), 784L (535s Joffre - 784AL tap) reclose Block for 962L/986L work 57.5 Hours
Daily		  
13-Oct-26 08:00 13-Oct-26 17:00 ATCO Outage 7L14 (705s Kitscoty - 751s Hill), 705s 703 (705s Kitscoty), 751s 701 (751s Hill) trees are encroaching, tree trimming / brushing crew 9 Hours
Continuous		  
13-Oct-26 08:00 16-Oct-26 16:00 ALTALINK, TRANSALTAGP TE WAP1s RTU/SCADA (WAP1s Westlock Algonquin Power) replace RTU with a new SMP SG-4260 RTU/HMI 80 Hours
Daily		  
13-Oct-26 08:00 19-Oct-26 17:00 ATCO TE 888s Protection & Control (888s Dover) tie in signals between 21A/9L09 and the new 21A/9L74, adjust 905 trip circuit on 21B/9L09 153 Hours
Continuous		  
13-Oct-26 08:00 13-Oct-26 16:00 ALTALINK TE AltaLink Telecom Equipment 388s GNSS Issue repair. Switched to 2nd source. The source has changed due to failure, so the GNSS issue needs to be fixed and switched back to the GNSS. 8 Hours
Daily		  
13-Oct-26 08:00 15-Oct-26 16:00 ENMAX, ALTALINK RB 1065L (74s Janet - 102s Langdon) fibre splicing in the FOSC at 1065L A frame in 102s Langdon 56 Hours
Daily		  
13-Oct-26 08:00 13-Oct-26 12:00 ENMAX Outage 31.1TR (SS-31) oil sampling 4 Hours
Continuous		  
13-Oct-26 08:00 13-Oct-26 16:00 ALTALINK TE 65s Protection & Control (65s High River), 753L (65s High River - 253s Blackie) protection maintenance 8 Hours
Daily		  
13-Oct-26 08:00 13-Oct-26 17:00 ATCO TE 876s RTU/SCADA (876s Brintnell) firewall upgrade 9 Hours
Continuous		  
13-Oct-26 08:00 13-Oct-26 16:00 ALTALINK TE 38s RTU/SCADA (38s East Edmonton) updating the RTU/HMI config to add new T7 and T8 alarms 8 Hours
Continuous		  
13-Oct-26 08:00 16-Oct-26 16:00 ALTALINK TE 574s Protection & Control (574s Nilrem) protection firmware update 80 Hours
Daily		  
13-Oct-26 08:00 16-Oct-26 16:00 ALTALINK TE 574s Protection & Control (574s Nilrem) protection firmware update 80 Hours
Daily		  
13-Oct-26 08:00 16-Oct-26 16:00 ALTALINK TE 377s Protection & Control (377s AML Hardisty) protection firmware update 80 Hours
Daily		  
13-Oct-26 08:30 15-Oct-26 17:00 ALTALINK RB 756L (87s Gaetz - 535s Joffre) reclose blocks for 962L/986L work 56.5 Hours
Daily		  
13-Oct-26 09:00 30-Oct-26 16:00 ATCO Outage 7L90 (813s Little Smoky - 7LA90 tap) 7L90 pole replacement 415 Hours
Continuous		  
13-Oct-26 09:00 18-Dec-26 18:00 ALTALINK Outage 799L (235s Entwistle - 443s South Mayerthorpe), 235s 799N (235s Entwistle) rebuild structure and restring OPGW 1,594 Hours
Continuous		  
13-Oct-26 09:00 14-Oct-26 15:00 ATCO TE ATCO RTU/SCADA, 809s RTU/SCADA (809s Louise Creek) configuration changes 30 Hours
Continuous		  
13-Oct-26 09:00 14-Oct-26 12:00 ATCO, SHELL Outage EX1-01L (402s Scotford Expansion One - 879s Upgrader), 402s EX1-01LD1 (402s Scotford Expansion One), 879s 152 (879s Upgrader) insulator cleaning and avian mitigation 27 Hours
Continuous		  
13-Oct-26 09:00 16-Oct-26 16:00 ATCO TE ATCO Telecom Equipment new and modified services
79 Hours
Continuous		  
13-Oct-26 09:00 16-Oct-26 17:00 BCH, BPA Outage 5L52 (BPA Custer - BCH Ingledow) glass replacement 80 Hours
Continuous		 AB-BC
13-Oct-26 09:00 13-Oct-26 10:00 ATCO TE ATCO Telecom Equipment, 777s RTU/SCADA (777s Vilna), 956s RTU/SCADA (956s Watt Lake), 819s Whitby Lake RTU/SCADA, 707s RTU/SCADA (707s St. Paul) upgrading the Hairy Hill 'A' SAR 1 Hour
Continuous		  
13-Oct-26 09:00 14-Oct-26 12:00 ATCO, AIRLIQUIDE RB ALC03L (402s Scotford Expansion One - 408s Air Liquide Scotford) insulator cleaning on EX101L 27 Hours
Continuous		  
13-Oct-26 09:00 15-Oct-26 17:00 ALTALINK Outage 431s 295 (431s Hussar), 431s T2 (431s Hussar) new bird cover 56 Hours
Continuous		  
13-Oct-26 09:00 14-Oct-26 17:00 ATCO TE ATCO Telecom Equipment Tinchebray_T-Telecom replacement 32 Hours
Continuous		  
13-Oct-26 10:00 15-Oct-26 16:00 ATCO TE 951s RTU/SCADA (951s Thickwood Hills) computer patching 54 Hours
Continuous		  
13-Oct-26 10:00 16-Oct-26 16:00 ATCO Outage 951s SVC (951s Thickwood), 951s 919 (951s Thickwood Hills), 951s 919A (951s Thickwood Hills), 951S 902 (951s Thickwood Hills), 951s 903 (951s Thickwood Hills) annual maintenance/inspection, config changes, 919A B Phase requires adjustment 102 Hours
Continuous		  
13-Oct-26 10:00 13-Oct-26 16:00 ALTALINK TE 420s Protection & Control (420s Broadmoor) fault settings change, standard maintenance, replace battery 6 Hours
Continuous		  
13-Oct-26 11:00 15-Oct-26 16:00 ALTALINK TE 149s Protection & Control (149s Nisku) fault recording implementation
53 Hours
Daily		  
13-Oct-26 11:00 15-Oct-26 16:00 ALTALINK TE 149s RTU/SCADA (149s Nisku) firmware upgrade and configuration changes on the RTU for fault reporting implementation 53 Hours
Continuous		  
13-Oct-26 11:00 16-Oct-26 17:00 ATCO RB 6L56 (763s Hanna - 802s Michichi Creek) climbing inspection on 6L56 78 Hours
Continuous		  
13-Oct-26 11:00 16-Oct-26 16:00 ALTALINK TE 478s Protection & Control (478s Tucuman) protection firmware update 77 Hours
Daily		  
13-Oct-26 12:00 13-Oct-26 16:00 ENMAX Outage 31.2TR (SS-31) oil sampling 4 Hours
Continuous		  
13-Oct-26 12:30 15-Oct-26 17:00 ALTALINK Outage 89s Ellerslie 240kV Bus 1, 89s T1 (89s Ellerslie), 89s 952 (89s Ellerslie), 89s 652 (89s Ellerslie), 89s 1352 (89s Ellerslie), 89s 252 (89s Ellerslie), 89s 1789 (89s Ellerslie) low gas top up 52.5 Hours
Continuous		  
13-Oct-26 12:30 15-Oct-26 17:00 ALTALINK, EPCOR RB 908L (89s Ellerslie - 816s Petrolia) Altalink working on 89s 240kV West Bus 52.5 Hours
Continuous		  
13-Oct-26 13:30 15-Oct-26 17:00 ALTALINK Outage 157s 138kV Bus 1 (157s Lac La Biche), 728L (157s Lac La Biche - 353s Plamondon), 788L (157s Lac La Biche - 788AL tap), 157s T1 (157s Lac La Biche), 157s C1 (157s Lac La Biche), 157s 728W (157s Lac La Biche), 157s 652 (157s Lac La Biche), 353s 552 (353s Plamondon), 157s 788N (157s Lac La Biche), 157s 3 (157s Lac La Biche) urgent switch repair/hot spot repairs, breaker maintenance

51.5 Hours
Continuous		  
13-Oct-26 14:00 19-Oct-26 16:00 ATCO Outage 7L128D2 (7LA128 tap) 7L12D3 repair 146 Hours
Continuous		  
13-Oct-26 16:00 13-Oct-26 19:00 EPCOR TE EP 511s RTU/SCADA (EP 511s Victoria) RTU outage 3 Hours
Continuous		  
14-Oct-26 06:00 15-Oct-26 17:00 ATCO TE ATCO RTU/SCADA SOC2 Backup Control Centre activation
System Operation will perform the failover to SOC2 Edmonton.
ICCP connection will go down for up to 60s
RTU polling will be down for 1-5 minutes while Telecom network gets migrated. DNP sites will be restored within 120 seconds.		 35 Hours
Continuous		  
14-Oct-26 07:00 14-Oct-26 17:00 ALTALINK Outage 299s 732N (299s Kingman), 299s T1 (299s Kingman) Customer replacing switchgear downstream. Crew to establish isolation with customer to hang grounds for their work. 10 Hours
Continuous		  
14-Oct-26 07:00 14-Oct-26 19:00 ALTALINK Outage 296s 152 (296s Rosyth), 296s T3 (296s Rosyth) 296s T3 CT ratio changes and new revenue meter 12 Hours
Continuous		  
14-Oct-26 07:00 16-Oct-26 17:00 EPCOR Outage EP 511s V724 (EP 511s Victoria), EP 511s V725 (EP 511s Victoria), EP 511s Victoria T3 (EP 511s Victoria) Victoria: TX3 Zone, TX LCR Civil Work 82 Hours
Continuous		  
14-Oct-26 07:30 15-Oct-26 17:00 ALTALINK Outage 74s 77 (74s Janet), 74s T2 (74s Janet) 74sT2 LO_SLOWGAS_PRD_MT Issue 33.5 Hours
Continuous		  
14-Oct-26 08:00 15-Oct-26 17:30 ALTALINK RB 730L (197s Bardo - 732L tap), 730L (285s East Camrose - 732L tap), 732L (299s Kingman - 732AL tap), 732AL (301s Queensland - 732L tap), 732L (732L tap - 732AL tap) replace arms and insulation 33.5 Hours
Daily		  
14-Oct-26 08:00 14-Oct-26 17:00 ALTALINK TE 150s RTU/SCADA (150s Clyde), AltaLink Telecom Equipment MPLS upgrade. Affects 723L/724L 9 Hours
Daily		  
14-Oct-26 08:00 15-Oct-26 16:00 ALTALINK TE 296s RTU/SCADA (296s Rosyth) RTU configuration update for 296s T3 metering upgrade. Loss of ACC visibility for 5 minutes during update. 32 Hours
Daily		  
14-Oct-26 08:00 14-Oct-26 16:00 ENMAX Outage 35.1TR (SS-35), 35B138-81 (SS-35), 35B138-82 (SS-35) HV Breaker Trip Coil Test - 35B138-82 8 Hours
Continuous		  
14-Oct-26 08:00 14-Oct-26 12:00 ENMAX Outage 33.2TR (SS-33) Oil Sampling Outage Required - 33.2-TC 4 Hours
Continuous		  
14-Oct-26 08:00 15-Oct-26 16:00 ALTALINK TE 504s Protection & Control (504s Queenstown) 161L A&B, 853L A&B protections will be removed from service one at a time for maintenance. Redundant protection to remain in service at all times. 96/152 & 96/352 will be removed from service for maintenance. Protections are non-redundant. 32 Hours
Daily		  
14-Oct-26 08:00 14-Oct-26 17:00 ATCO TE 811s RTU/SCADA (811s Clairmont Lake) Both firewalls at the CLAIRMONTLAKE substation will undergo a scheduled upgrade to maintain system security and to remove any bugs on the system. The firewalls are redundant on site but there will be a 10 minutes SCADA outage when the firewalls are upgraded. 9 Hours
Continuous		  
14-Oct-26 08:00 15-Oct-26 16:00 SUNCOR Outage 635EDD-1000 RTU/SCADA (635EDD-1000), 635EDD-1001 RTU/SCADA (635EDD-1001), 635EDD-1002 RTU/SCADA (635EDD-1002), 635EDD-1003 RTU/SCADA (635EDD-1003) Fort Hills: Update configuration to disable Daylight Saving Time on 7 devices across three locations . Brief SCADA outages will occur when configuration is being updated hence loss of data visibility. 32 Hours
Continuous		  
14-Oct-26 08:30 14-Oct-26 17:00 ALTALINK Outage 395s 701X (395s North Holden) Replace temporary cable with new permanent cable 8.5 Hours
Daily		  
14-Oct-26 09:00 14-Oct-26 17:00 ATCO TE ATCO Telecom Equipment Removal of DJF at 960S. Relocation of 9L57B circuit
3 separate outages

SAR-A
9LA74B 2102S/960S
9L74A&B 888S / 960S
9L57A 960S / 939S

SAR-B
9LA74A 2102S/960S
9L74A 888S / 960S

SAR-NET11
9L74B 888S / 960S
9L57B 960S / 939S		 8 Hours
Continuous		  
14-Oct-26 10:00 14-Oct-26 16:00 ATCO Outage 823s 701T (823s Wapiti) 823S Damaged Stress Cone on 701T secondary Cable
7L09 Pole 111 Cross-arm replacement		 6 Hours
Continuous		  
14-Oct-26 12:00 14-Oct-26 16:00 ENMAX Outage 40.1TR (SS-40) Oil Sampling Outage Required - 40.1-TC 4 Hours
Continuous		  
14-Oct-26 12:15 15-Oct-26 16:00 ATCO, AIRLIQUIDE Outage ALC03L (402s Scotford Expansion One - 408s Air Liquide Scotford) Insulator cleaning and deficiency repair on ALC03L. Avian mitigation bird perch deterrents 28 Hours
Continuous		  
14-Oct-26 12:15 15-Oct-26 16:00 ATCO, ALTALINK, SHELL TE 402s Protection & Control (402s Scotford Expansion 1) replacing failed 89a/b contact blocks on ALC03LD2 MOD during GOI 2-00110967. Will require blocking the 2 line relays, possibly P&C settings changes on these relays (P&C decision upcoming) 27.75 Hours
Continuous		  
14-Oct-26 12:15 15-Oct-26 16:00 ATCO, SHELL RB EX1-01L (402s Scotford Expansion One - 879s Upgrader) insulator cleaning on ALC03L 27.75 Hours
Continuous		  
14-Oct-26 19:00 15-Oct-26 05:00 ENMAX RB 20.82L (SS-20 - SS-21) construction 1.81L river crossing 10 Hours
Continuous		  
15-Oct-26 06:00 21-Oct-26 18:00 SUNCOR Outage 635EDD-1000 635-752-153 (635EDD-1000), 635EDD-1000 635-752-152 (635EDD-1000), 635PL7-1002 (635EDD-1000 - 635EDD-1004) Fort Hills: MP09 - Planned maintenance of 144kV and 72kV equipment. 156 Hours
Continuous		  
15-Oct-26 07:00 15-Oct-26 17:00 EPCOR Outage RR729 (Rossdale) Rossdale: RR729, DFR Upgrade Cutovers and Commissioning 10 Hours
Continuous		  
15-Oct-26 07:00 15-Oct-26 09:00 CMH TE Medicine Hat ICCP Outage upgrading our firewall to new model,CMH's ICCP link to go down as the physical ICCP link will need to be moved from the old firewall device. still have visibility & control it's equipment during this time. 2 Hours
Continuous		  
15-Oct-26 07:15 15-Oct-26 18:00 ALTALINK Outage 781L (71s Lamoureux - 172s Sherritt), 172s 781W (172s Sherritt), 71s 781E (71s Lamoureux) urgent Repair, transmission line repairs 10.75 Hours
Daily		  
15-Oct-26 07:30 15-Oct-26 17:30 ALTALINK, DOW RB 787L (166s Dow Chemical Fort Saskatchewan - 787AL tap), 787L (71s Lamoureux - 787AL tap) safety requirement for 781L GOI 10 Hours
Daily		  
15-Oct-26 07:30 17-Oct-26 17:00 ATCO, ALTALINK RB 912L (63s Red Deer - 766s Nevis) for 962L/986L working between str. 165,166 57.5 Hours
Daily		  
15-Oct-26 07:30 17-Oct-26 17:00 ATCO, ALTALINK IO 9L912 (63s Red Deer - 766s Nevis) reclosing blocked for AltaLink work 57.5 Hours
Continuous		  
15-Oct-26 08:00 15-Oct-26 18:00 ALTALINK Outage 763L (28s West Brooks - 763AL tap), 763AL (447s Enchant - 763A1L tap), 763L (158s Vauxhall - 763AL tap), 158s 763N (158s Vauxhall), 28s 47 (28s West Brooks), 28s 31 (28s West Brooks), 447s 763A (447s Enchant), 447s 16 (447s Enchant), 763L259 (763AL tap), 763L257A (763AL tap), 28s 763X (28s West Brooks) 447s27 replace line VT. (Like for like replacement) 10 Hours
Continuous		  
15-Oct-26 08:00 15-Oct-26 17:00 ALTALINK, TRANSALTAGP TE WAP1s RTU/SCADA (WAP1s Westlock Algonquin Power) SCADA VLAN, firmware, telecom firewall upgrade, LAN switch upgrade, MPLS node upgrades, RAW socket conversion 9 Hours
Daily		  
15-Oct-26 08:00 15-Oct-26 12:00 ENMAX Outage 39.3TR (SS-39) oil sampling outage required - 39.3-TC 4 Hours
Continuous		  
15-Oct-26 08:00 30-Oct-26 16:00 ENMAX Outage 5.7TR (SS-5) 25kV Bus. pull in 25kV feeder cables. ground 25kV Bus 368 Hours
Continuous		  
15-Oct-26 08:00 15-Oct-26 16:00 ALTALINK TE 71s Protection & Control (71s Lamoureux) standard relay maintenance 8 Hours
Daily		  
15-Oct-26 09:00 15-Oct-26 16:00 ATCO TE 721s La Corey, ATCO Telecom Equipment LaCorey_s-telecom- 7750-2 Integration. swapping site networking to VPLS 11, 721s Scada outage during switch update will lose visibility for up to 2 hours. 7 Hours
Continuous		  
15-Oct-26 12:00 16-Oct-26 17:00 ATCO TE ATCO Telecom Equipment, 721s La Corey lacorey_s-telecom-MPLS life cycle upgrades to SAR A. prep on Oct 15, cut over Oct 16 between 10am-2pm.7L89 thermal protection - 7L89 702 breaker fail 29 Hours
Continuous		  
15-Oct-26 12:00 15-Oct-26 16:00 ENMAX Outage 39.4TR (SS-39) oil sampling outage required - 39.4-TC. reversing switch check 4 Hours
Continuous		  
15-Oct-26 13:00 15-Oct-26 18:00 ALTALINK, TRANSALTA, Lethbridge Outage 15s 725 (15s Fort Macleod), 725BL (240s McBride Lake - 725L tap), 725L (15s Fort MacLeod - 725BL tap), 725L (674s Bowron - 725BL tap) Advice to City of Lethbridge to close their Open Point. 3.83 Hours
Continuous		  
15-Oct-26 14:00 15-Oct-26 17:00 Lethbridge, ALTALINK Outage 674s 1 (674s Bowron), 725L (674s Bowron - 725BL tap) 725L line Outage required on 725LW to close Open Point “A” at structure #1 to 674s1 at 674s substation 3 Hours
Continuous		  
15-Oct-26 19:00 16-Oct-26 05:00 ENMAX RB 20.82L (SS-20 - SS-21) construction 1.81L river crossing 10 Hours
Continuous		  
16-Oct-26 07:00 22-Oct-26 17:00 ALTALINK RB 7L230 (69s North Barrhead - 888AL tap) ATCO climbing inspection 154 Hours
Daily		  
16-Oct-26 07:00 16-Oct-26 17:00 EPCOR TE 665s RTU/SCADA (665s Dome) Dome: RTU outage 10 Hours
Continuous		  
16-Oct-26 08:00 22-Oct-26 17:00 ATCO, ALTALINK RB 7L230 (743s Sarah Lake - 888AL tap) walkup and climbing inspection on 7L230 153 Hours
Continuous		  
16-Oct-26 08:00 16-Oct-26 17:00 ALTALINK TE 69s RTU/SCADA (69s North Barrhead), AltaLink Telecom Equipment MPLS node upgrades 9 Hours
Daily		  
16-Oct-26 08:00 05-Nov-26 17:00 ATCO, ALTALINK RB 12L41 (510s Sunnybrook - 939s Livock) installing replacement corona rings on 12L41 due to failure 490 Hours
Continuous		  
16-Oct-26 08:00 16-Oct-26 16:00 ALTALINK TE 252s RTU/SCADA (252s Jarrow), AltaLink Telecom Equipment telecom upgrade 8 Hours
Daily		  
16-Oct-26 08:00 05-Nov-26 17:00 ATCO, ALTALINK RB 12L41 (510s Sunnybrook - 939s Livock) installing replacement corona rings on 12L41 due to failure 490 Hours
Daily		  
16-Oct-26 08:00 16-Oct-26 12:00 ENMAX Outage 11.1TR (SS-11) oil sampling outage required  4 Hours
Continuous		  
16-Oct-26 09:00 16-Oct-26 16:00 ATCO TE 720s RTU/SCADA (720s Wabasca), ATCO Telecom Equipment 7750-2 integration, swapping site networking to VPLS 11 7 Hours
Continuous		  
16-Oct-26 10:00 19-Oct-26 16:00 ATCO Outage 888s 905 (888s Dover) 21A/9L74 relay replacement, cutover breaker and CT to new protection 78 Hours
Continuous		  
16-Oct-26 19:00 17-Oct-26 05:00 ENMAX RB 20.82L (SS-20 - SS-21) construction 1.81L river crossing, crew working in close proximity to 20.82L 10 Hours
Continuous		  

Prepared On:   2026-10-07   15:14:47

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.

© 2009 Alberta Electric System Operator. All rights reserved