Alberta Electric System Operator
System Co-ordination Plan
2026-10-03 to 2026-10-09
Approved Outages

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From To Owner Type Element Scheduled Activity Date/Time Comments Interconnection
26-Jul-24 10:00 30-Jun-27 16:00 ATCO Outage 826s 504R (826s Marguerite Lake) emergency removal to replace failed 502R @834S 25,662 Hours
Continuous		  
20-Mar-25 08:00 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		  
31-Aug-26 13:00 06-Oct-26 07:30 ATCO TE 790s Protection & Control (790s Poplar Hill), 790s RTU/SCADA (790s Poplar Hill) wire new breaker 508, 508 feeder protection into the station RTU and 701T protection 858.5 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 06-Oct-26 17:00 EPCOR Outage 805s T4 (805s Jasper), EP 805s J2405 (EP 805s Jasper), EP 805s J2406 (EP 805s Jasper), EP 805s JAB4 (EP 805s Jasper) replacement LCR Jasper J2406/JDS10 1,090 Hours
Continuous		  
08-Sep-26 07:00 04-Oct-26 17:00 EPCOR Outage 72KN23 (Kennedale - Namao) UGT oil degasification project 634 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		  
08-Sep-26 09:30 05-Oct-26 12:00 ATCO Outage 7L170 (875s Algar - 2011s Dawes), 7L38 (875s Algar - 917s Horse River), 875s 701T (875s Algar), 875s 701 (875s Algar), 875s 702 (875s Algar), 875S 701TCS (875s Algar) replace 701TCS + SCADA / protection upgrade 650.5 Hours
Continuous		  
08-Sep-26 09:30 05-Oct-26 17:30 ATCO TE 875s Protection & Control (875s Algar) replace 701TCS and SCADA / protection upgrade
656 Hours
Continuous		  
08-Sep-26 09:30 05-Oct-26 17:30 ATCO TE 917s Protection & Control (917s Horse River) replace 701TCS and SCADA / protection upgrade at 875s 656 Hours
Continuous		  
08-Sep-26 09:30 05-Oct-26 17:30 ATCO TE 2011s Protection & Control (2011s Dawes) replace 701TCS and SCADA / protection upgrade at 875s 656 Hours
Continuous		  
09-Sep-26 07:00 03-Oct-26 17:00 EPCOR Outage 72RV6 (EP 511s Victoria - Rossdale), EP 511s Victoria T3 (EP 511s Victoria), EP 511s V724 (EP 511s Victoria), EP 511s V725 (EP 511s Victoria), RV722 (Rossdale), EP 511s V723 (EP 511s Victoria), EP 511s VDS9 (EP 511s Victoria), EP 511s VAB3 (EP 511s Victoria) RV6/Victoria: RV6/TX3 Zone, civil works for emergency TX3 replacement 226 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 08:00 07-Oct-26 16:00 ALTALINK TE 434s RTU/SCADA (434s Stony Plain) RTU database update 560 Hours
Daily		  
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		  
19-Sep-26 12:30 03-Oct-26 12:00 ENMAX Outage 20.82L (SS-20 - SS-21), 20B138-20.82 (SS-20), 21B138-20.82 (SS-21) construction 20.82L river crossing 335.5 Hours
Continuous		  
21-Sep-26 08:00 04-Oct-26 19:00 ATCO RB 13L50 (2029s Heathfield - 2075s Newell) installing SVDs from str 1-775, then 975-1387 323 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 05-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 346 Hours
Continuous		  
25-Sep-26 08:00 05-Oct-26 16:00 ALTALINK TE 149s RTU/SCADA (149s Nisku) add new transformer alarms for T1 (TX 18363) 248 Hours
Daily		  
25-Sep-26 17:00 05-Oct-26 06:00 ALTALINK Outage 149s T1 (149s Nisku) move s1, s11, s22 to new T1 location 159 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 07-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		  
28-Sep-26 12:30 05-Oct-26 17:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) installing interphase spacers on 7L760 - live line work 173 Hours
Daily		  
28-Sep-26 13:00 05-Oct-26 17:00 ATCO RB 7L760 (767s Oyen - 7LC760 tap) installing interphase spacers on 7L760 - live line work 4 Hours
Continuous		  
29-Sep-26 08:00 05-Oct-26 16:00 ATCO RB 7L12 (780s Lubicon - 7LA12 tap), 7L12 (834s Wesley Creek - 7LA12 tap) installing openers on 7l12 for switch replacement 152 Hours
Continuous		  
29-Sep-26 08:00 05-Oct-26 16:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 50BF/603 for settings changes and relay testing 152 Hours
Continuous		  
29-Sep-26 08:00 05-Oct-26 16:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 21B/7L230 for some minor settings changes 152 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		  
01-Oct-26 06:00 06-Oct-26 18:00 SUNCOR Outage 635EDD-1001 635PT-1039 (635EDD-1001), 635EDD-1001 635-752-623 (635EDD-1001), 635EDD-1001 635-752-622 (635EDD-1001) planned maintenance of 144kV equipment in 635EDD-1001 diameter 2 bottom 132 Hours
Continuous		  
01-Oct-26 08:30 04-Oct-26 17:30 ATCO RB 9L74 (888s Dover - 960s Birchwood Creek) work near 9L74 - proximity clearance 81 Hours
Continuous		  
02-Oct-26 07:00 05-Oct-26 17:00 EPCOR Outage 72NW15 (Namao - Woodcroft), N726 (Namao), W723 (Woodcroft) emergency pole replacement 82 Hours
Continuous		  
02-Oct-26 08:00 05-Oct-26 16:00 ENMAX Outage 33.84L (SS-33 - SS-43) KLS installing fire hydrant 80 Hours
Continuous		  
03-Oct-26 07:00 03-Oct-26 17:00 ATCO Outage 7L760 (767s Oyen - 7LC760 tap), 767s 702 (767s Oyen) install interphase spacers, insulator replacement and deficiencies 10 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 06-Oct-26 19:00 ALTALINK Outage 149s T1 (149s Nisku), 149s C1 (149s Nisku) close open point on 149s1 to 138kv bus, close open point on 149s11 to 25kV bus, add new SST 37 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 18-Oct-26 17:00 EPCOR Outage CV5 (EP 511s Victoria - 557s Castle Downs), EP 511s Victoria T5 (EP 511s Victoria), 557s CD2405 (557s Castle Downs), 557s CD2406 (557s Castle Downs), EP 511s V2401 (EP 511s Victoria), EP 511s V727 (EP 511s Victoria), EP 511s V728 (EP 511s Victoria), EP 511s VDS25 (EP 511s Victoria) manhole inspections and maintenance and 72kV breaker fail protection upgrade cutovers and commissioning 322 Hours
Continuous		  
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 07:00 05-Oct-26 17:00 ATCO, ALTALINK RB 701L (223s Strome - 7LA701 tap) installing aerial marker on 7L701 at str spans 42 and 43 81 Hours
Continuous		  
05-Oct-26 07:00 05-Oct-26 17:00 ENMAX, ALTALINK Outage 21.80L (42s Sarcee - SS-21), 42s 21 (42s Sarcee), 21B138-21.80 (SS-21) ENMAX - fall substation washing 10 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 IO 882L (MHS-7 Brier Park - 321s Al Rothbauer), 321s 252 (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 05-Oct-26 16:00 ATCO RB 7L701 (757s Battle River - 7LA701 tap) installing aerial marker on 7L701 at str spans 42 and 43 80 Hours
Continuous		  
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 06-Oct-26 16:00 ALTALINK TE 359s RTU/SCADA (359s Esso West Pembina) T1 meter replacement configuration updates 32 Hours
Daily		  
05-Oct-26 08:00 05-Oct-26 12:00 ENMAX Outage 162B138-RB92 (SS-162) breaker trip circuit test 4 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 06-Oct-26 16:00 ENMAX Outage 38.1C (SS-38), 38B138-38.1CAP (SS-38) capacitor bank maintenance - 38.1CAPBANK 32 Hours
Continuous		  
05-Oct-26 08:00 05-Oct-26 17:00 ALTALINK TE 149s Protection & Control (149s Nisku) initiate trip signal from breaker fail protections to T1 low side breaker 452 9 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 08:00 05-Oct-26 12:00 ENMAX Outage 13.2TR (SS-13) 13.2TR LTC oil leak near sudden pressure relay -redo coupling gasket. tap changer reversing switch check - 13.2-TC 4 Hours
Continuous		  
05-Oct-26 08:00 07-Oct-26 16:00 Syncrude Outage 89-15 (Aurora), T3 (Aurora), G20 (Aurora) opening MOD 89-15 56 Hours
Continuous		  
05-Oct-26 08:30 08-Oct-26 16:00 ATCO, AESO-SC 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), 9L74-Pseudo (888s Dover), 960s 9L74D1 (960s Birchwood Creek) 21B/9L74 relay three terminal line testing 78 Hours
Continuous		  
05-Oct-26 09:00 07-Oct-26 17:30 ATCO Outage 2029s 1301 (2029s Heathfield) DC high speed switch maintenance 56.5 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 09:00 07-Oct-26 16:00 ALTALINK Outage 886L (428s Namaka - 431s Hussar), 428s 886N (428s Namaka), 431s T1 (431s Hussar), 431s T2 (431s Hussar), 431s 195 (431s Hussar), 431s 295 (431s Hussar), 431s 152 (431s Hussar), 431s C1 (431s Hussar) 431s stations outage - C1 protection replacement, isolation and grounding for rockpoint 55 Hours
Continuous		  
05-Oct-26 09:00 07-Oct-26 16:00 ATCO TE 738s RTU/SCADA (738s Virginia Hills), ATCO Telecom Equipment Virginia Hills_S-Telecom- 7750-2 Integration.738s Scada outage during switch update will lose visibility for up to 2 hours.
55 Hours
Continuous		  
05-Oct-26 10:00 16-Oct-26 17:30 ATCO Outage 6L09 (767s Oyen - 6L21 tap), 767s Oyen leak repairs on 701T, breaker testing, transformer testing, and switch repairs
271.5 Hours
Continuous		  
05-Oct-26 10:00 05-Oct-26 15:00 ALTALINK TE 5s Protection & Control (5s East Calgary) 5s T1 through fault settings changes on T1A 5 Hours
Continuous		  
05-Oct-26 10:00 05-Oct-26 16:00 ALTALINK TE 95s Protection & Control (95s Imperial Oil Edmonton) through fault monitoring settings changes on T1 A and T2 A

6 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 07-Oct-26 16:00 ATCO TE 738s RTU/SCADA (738s Virginia Hills), ATCO Telecom Equipment new building will be installed at 738s Virginia hills 53 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 05-Oct-26 16:00 ALTALINK TE 301s Protection & Control (301s Queensland) through fault settings changes on T1A 5 Hours
Continuous		  
05-Oct-26 11:00 06-Oct-26 17:00 ATCO TE ATCO Telecom Equipment MPLS life cycle upgrades to SAR A & SAR OS UPGRADE TO V.21, V.22. New SAR A, ETH Cards 1.1/1.2 slot 30 Hours
Continuous		  
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 06-Oct-26 16:00 ALTALINK Outage 359s T1 (359s Esso West Pembina) T1 meter replacement 28 Hours
Continuous		  
05-Oct-26 12:00 05-Oct-26 17:00 ALTALINK TE 339s Protection & Control (339s Duchess) 339s standard testing of T1 A and T1 B protections 5 Hours
Continuous		  
05-Oct-26 12:00 05-Oct-26 16:00 ALTALINK TE 42s Protection & Control (42s Sarcee) through fault monitoring settings changes on T1A and T2A protections 4 Hours
Continuous		  
05-Oct-26 12:00 05-Oct-26 16:00 ENMAX Outage 162B138-RB94 (SS-162) breaker trip circuit test - 162B138-RB94 4 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 06-Oct-26 16:00 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 27 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 06-Oct-26 16:30 ALTALINK Outage 122s T1 (122s Alberta Newsprint) repair leaking PRD on T1 and clean leak mitigation materials 7 Hours
Daily		  
06-Oct-26 08:00 06-Oct-26 17:00 ENMAX, ALTALINK Outage 50L (44s Bearspaw Plant - SS-21), 21.1C (SS-21), 21.2TR (SS-21), 60s50 (SS-21), 21MD138-21.2TR (SS-21) fall substation washing 9 Hours
Continuous		  
06-Oct-26 08:00 06-Oct-26 17:00 ENMAX, ALTALINK IO 50L (44s Bearspaw Plant - SS-21), 44s 50X (44s Bearspaw Plant) fall substation washing 9 Hours
Continuous		  
06-Oct-26 08:00 06-Oct-26 16:00 ALTALINK TE AltaLink Telecom Equipment TELUS VPN work 8 Hours
Daily		  
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 07-Oct-26 16:00 ALTALINK TE 428s Protection & Control (428s Namaka) PRC maintenance on 733LN line protection 32 Hours
Daily		  
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 06-Oct-26 16:00 ALTALINK TE 320p Protection & Control (320P Keephills) PRC settings change on B21/79/L12 190L relay
8 Hours
Continuous		  
06-Oct-26 08:00 06-Oct-26 16:00 ALTALINK TE 140s RTU/SCADA (140s Thompson), AltaLink Telecom Equipment investigate alarm issue on site and perform radio maintenance 8 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 06-Oct-26 16:00 ALTALINK TE 275s RTU/SCADA (275s Jenner) fix a sub clock trouble alarm 8 Hours
Continuous		  
06-Oct-26 08:00 06-Oct-26 16:00 ALTALINK TE 275s Protection & Control (275s Jenner) techs to complete maintenance
8 Hours
Continuous		  
06-Oct-26 08:00 06-Oct-26 17:00 ATCO TE ATCO Telecom Equipment, 875s RTU/SCADA (875s Algar) upgrade to maintain system security and to remove any bugs on the system 9 Hours
Continuous		  
06-Oct-26 08:00 06-Oct-26 17:00 ATCO TE ATCO Telecom Equipment, 845s RTU/SCADA (845s Big Mountain) upgrade to maintain system security and to remove any bugs on the system 9 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 07-Oct-26 16:00 ALTALINK TE 102s RTU/SCADA (102s Langdon) DLR local alarm name change 32 Hours
Daily		  
06-Oct-26 08:00 07-Oct-26 16:00 ALTALINK TE 102s Protection & Control (102s Langdon) DLR protection outages to test alarm name change 32 Hours
Daily		  
06-Oct-26 08:00 07-Oct-26 16:00 ALTALINK TE 428s Protection & Control (428s Namaka) PRC maintenance 32 Hours
Daily		  
06-Oct-26 08:00 06-Oct-26 16:00 ALTALINK TE 356s RTU/SCADA (356s Milo), AltaLink Telecom Equipment MPLS node A upgrade 8 Hours
Daily		  
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 09:00 07-Oct-26 17:00 ALTALINK Outage 431s Hussar, 886L (428s Namaka - 431s Hussar), 431s C1 (431s Hussar), 431s T1 (431s Hussar), 431s T2 (431s Hussar), 428s 886N (428s Namaka), 431s 195 (431s Hussar), 431s 295 (431s Hussar), 431s 4 (431s Hussar) breaker, switch and relay maintenance and repair 32 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		  
06-Oct-26 12:01 06-Oct-26 16:00 ENMAX Outage 162B240-RB134 (SS-162) breaker trip circuit test 3.98 Hours
Continuous		  
06-Oct-26 16:01 08-Oct-26 17:00 ALTALINK Outage 908L (89s Ellerslie - 908AL tap), 89s 852 (89s Ellerslie), 89s 752 (89s Ellerslie) breaker maintenance 89s852, switch maintenance 89s14, 89s15 48.98 Hours
Continuous		  
06-Oct-26 22:00 07-Oct-26 05:00 EPCOR Outage 987s GT3 (987s Clover Bar) Cloverbar: GT3/CGB3, bus diff cutover and commissioning 7 Hours
Continuous		  
07-Oct-26 07:00 07-Oct-26 19:00 ALTALINK Outage 301s 152 (301s Queensland), 301s T1 (301s Queensland) replace qualitrol 930 boards on T1 12 Hours
Daily		  
07-Oct-26 08:00 07-Oct-26 18:00 Syncrude TE Syncrude ICCP Outage SCADA - server update whole syncrude visibility loss 10 Hours
Daily		  
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 08:00 07-Oct-26 18:00 ENMAX Outage 21.4TR (SS-21), 15.60L (SS-15 - SS-21), 21.61L (SS-21 - SS-34), 21B69-21.4TR (SS-21), 21B69-21.61 (SS-21), SW64 (SS-21), 21B69-15.60 (SS-21), SW65 (SS-21) fall substation washing 10 Hours
Continuous		  
07-Oct-26 08:00 08-Oct-26 16:00 ENMAX Outage 31.1C (SS-31) cap bank maintenance - 31.1C 32 Hours
Continuous		  
07-Oct-26 08:00 07-Oct-26 17:00 ALTALINK TE 140s RTU/SCADA (140s Thompson) telecom upgrade 9 Hours
Daily		  
07-Oct-26 08:00 07-Oct-26 16:00 ALTALINK TE AltaLink Telecom Equipment radio maintenance and repair activity on radio hop 8 Hours
Daily		  
07-Oct-26 08:00 07-Oct-26 17:00 ATCO TE 960s RTU/SCADA (960s Birchwood Creek) birchwood-s-telecom- firewall firmware upgrade 9 Hours
Continuous		  
07-Oct-26 08:00 07-Oct-26 17:00 ATCO TE 941s RTU/SCADA (941s Bitumount) Bitumount- firewall firmware upgrade 9 Hours
Continuous		  
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 11:00 07-Oct-26 13:00 ATCO Outage 731s 701T (731s Elmworth), 731s 501 (731s Elmworth), 731s 502 (731s Elmworth), 731s 503 (731s Elmworth) PRC-005 - SPR tesing - 701T, substation outage for sudden pressure relay testing only. 2 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 02-Nov-26 17:00 ATCO TE 2102s Armistead 9L74 21B three terminal protection testing is being completed Oct 5 - 8 under GOI 2-95411 610 Hours
Continuous		  
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 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 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		  

Prepared On:   2026-10-02   16:45:53

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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