Alberta Electric System Operator
System Co-ordination Plan
2026-03-19 to 2026-03-27
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 735.25 Days
Continuous		  
23-Aug-24 13:45 30-Jun-26 14:29 ALTALINK Outage 157s C1 (157s Lac La Biche) forced outage 676.03 Days
Continuous		  
20-Mar-25 08:00 20-Mar-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 365.38 Days
Continuous		  
31-Mar-25 07:00 01-May-26 17:00 EPCOR TE Protection & Control (Woodcroft) Woodcroft: protection blocking for merging unit and protection upgrade. 396.42 Days
Continuous		  
25-Jul-25 17:01 17-Apr-26 17:00 EPCOR Outage T2 (EP Riverview) bushing test failure (found during OE110184) 266 Days
Continuous		  
12-Sep-25 08:00 19-Jun-26 16:00 ENMAX Outage 33.1TR (SS-33) tap changer refurbishments. soak test required 280.33 Days
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 730.33 Days
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) urgent repairs on 29PT-224 at 29EDD34 on 29PP-45 bus 241.29 Days
Continuous		  
05-Jan-26 08:00 22-Mar-26 16:00 ENMAX Outage 1.80L (SS-1 - SS-28), 28B138-1.80 (SS-28) 1 sub transmission line cut over 76.29 Days
Continuous		  
05-Jan-26 08:00 22-Mar-26 16:00 ENMAX Outage 1.81L (SS-1 - SS-20), 20B138-1.81 (SS-20) 1 sub transmission line cut over 76.29 Days
Continuous		  
08-Jan-26 15:00 27-Mar-26 17:00 ALTALINK Outage 42s C2 (42s Sarcee) forced outage 78.04 Days
Daily		  
12-Jan-26 07:00 03-Apr-26 17:00 EPCOR TE 330p Protection & Control (330p Genesee) protect blocking, annual relay maintenance and password changes 81.38 Days
Continuous		  
12-Jan-26 07:00 01-May-26 17:00 EPCOR TE Protection & Control (Rossdale) protection blocking, relay maintenance 109.38 Days
Continuous		  
12-Jan-26 07:00 03-Apr-26 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) protection blocking, relay maintenance 81.38 Days
Continuous		  
17-Jan-26 11:00 27-Mar-26 17:00 BHE Canada Outage 120s C2 (120s Picture Butte) forced outage 69.21 Days
Continuous		  
21-Jan-26 08:00 30-Oct-26 16:00 ENMAX Outage 5.7TR (SS-5) 25kV switchgear replacement 282.29 Days
Continuous		  
03-Feb-26 09:00 30-Jun-26 17:00 ATCO TE 972s RTU/SCADA (972s Tinchebray) config changes needed throughout the CETO project 147.29 Days
Continuous		  
06-Feb-26 07:00 30-Mar-26 17:30 ALTALINK RB 793L (87s Gaetz - 535s Joffre) crews will be setting structures on 986L/962L STR’s 41-56 & 24-41 and will require a Reclosure Block on
793L		 52.4 Days
Daily		  
08-Feb-26 07:00 06-Apr-26 18:00 ALTALINK Outage 799L (235s Entwistle - 443s South Mayerthorpe), 235s 799N (235s Entwistle) 799L rebuild between Str 721B-758 (Section B) 57.42 Days
Continuous		  
09-Feb-26 09:00 26-Jun-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) block all 50BF protection until cutovers and associated commissioning are complete 137.29 Days
Continuous		  
17-Feb-26 12:00 09-Apr-26 13:31 ATCO TE 882s RTU/SCADA (882s Triangle) updating RTU/station controller configuration during SCADA upgrade project 51.02 Days
Continuous		  
23-Feb-26 07:00 23-Mar-26 07:00 EPCOR Outage 805s T3 (805s Jasper) bushing change 27.96 Days
Continuous		  
02-Mar-26 08:00 19-Mar-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole and cross arm replacement 17.29 Days
Continuous		  
06-Mar-26 17:00 13-Nov-26 17:00 EPCOR Outage T1 (Woodcroft) woodcroft: TX1 LCR civil 252 Days
Continuous		  
08-Mar-26 08:30 24-Mar-26 16:00 ENMAX Outage 38.83L (SS-38 - SS-39), 39.3TR (SS-39), 39.1TR (SS-39), 38B138-38.83 (SS-38), 39B138-38.83 (SS-39), 39MD138-39.1TR (SS-39), 39MD138-39.3TR (SS-39) HV SW replacement 16.31 Days
Continuous		  
09-Mar-26 07:00 27-Mar-26 17:00 EPCOR TE 816s Protection & Control (816s Petrolia) relay maintenance 18.42 Days
Continuous		  
10-Mar-26 09:00 14-Apr-26 17:00 ATCO Outage 972s 240kV Bus 900BS2 (972s Tinchebray) install breakers 905/906, 905CT/906CT, switches 905A/906B
 35.33 Days
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 265.33 Days
Continuous		  
10-Mar-26 14:42 20-Mar-26 17:00 ALTALINK Outage 897L (38s East Edmonton - 45s Bretona), 38s 897 (38s East Edmonton) forced outage due to leaking CT 10.1 Days
Continuous		  
11-Mar-26 13:45 31-Mar-26 16:00 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 20.09 Days
Continuous		  
13-Mar-26 16:00 20-Mar-26 17:00 ATCO Outage 7L122 (791s Rainbow Lake - 930s Arcenciel), 791s 701 (791s Rainbow Lake) phase replacement 7.04 Days
Continuous		  
14-Mar-26 07:00 29-Mar-26 17:00 EPCOR Outage 330p 500kV Bus 1 (330p Genesee), 330P 12TC1 (330p Genesee), 330p 1207 (330p Genesee), 330p 1204 (330p Genesee), 330p 1201 (330p Genesee), 330p 1210 (330p Genesee), 330p 1214 (330p Genesee), 330p 12TC1D (330p Genesee), 330p 805 (330p Genesee) POW project installation 15.42 Days
Continuous		  
15-Mar-26 07:00 01-Apr-26 17:00 EPCOR Outage 330p 1211 (330p Genesee), 330p 1210 (330p Genesee) POW project installation 17.42 Days
Continuous		  
15-Mar-26 07:00 01-Apr-26 17:00 EPCOR Outage 330P GT6 (330p Genesee) maintenance and POW project installation 17.42 Days
Continuous		  
16-Mar-26 07:00 19-Mar-26 17:00 EPCOR, ALTALINK Outage 1058L (657s Summerside - EP 803s Lambton), EP 803s L2403 (EP 803s Lambton), EP 803s L2404 (EP 803s Lambton), 657s SU2403 (657s Summerside), 657s SU2404 (657s Summerside) Lambton surge counter install and summerside SUDS10 ice shield repair 3.42 Days
Continuous		  
16-Mar-26 07:00 20-Mar-26 17:00 EPCOR Outage T2 (Poundmaker) TX2 bladder and sample pipe repair 4.42 Days
Continuous		  
16-Mar-26 07:00 01-Apr-26 17:00 EPCOR Outage 987s GT1 (987s Clover Bar), 987s CGB1 (987s Clover Bar) maintenance 16.42 Days
Continuous		  
16-Mar-26 07:00 20-Mar-26 17:00 EPCOR Outage 665s T2 (665s Dome) Dome: TX2, neutral bar move for building expansion (UGT) 4.42 Days
Continuous		  
16-Mar-26 07:00 19-Mar-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) SCADA change for CETO project 3.42 Days
Daily		  
16-Mar-26 07:30 16-Apr-26 15:30 CMH TE MHS-2 RTU/SCADA (MHS-2 North Industrial) replacement of existing Axiom Scout RTAC with SEL 3350 RTAC. 31.33 Days
Continuous		  
16-Mar-26 08:00 19-Mar-26 17:00 ALTALINK RB 514BL (322s Cowley Ridge Windplant - 514L tap), 514L (396s Pincher Creek - 514BL tap), 514L (513s Lundbreck - 514BL tap) south crew will be doing line maintenance on 514L from STR 48-453 3.38 Days
Continuous		  
16-Mar-26 08:00 25-Mar-26 17:00 ALTALINK Outage 87s 2352 (87s Gaetz), 87s 1652 (87s Gaetz), 87s T1 (87s Gaetz), 87s 240kV West Bus (87s Gaetz), 914L (63s Red Deer - 87s Gaetz) installing new 87s1752 & 87s1952 9.38 Days
Continuous		  
16-Mar-26 08:00 25-Mar-26 16:00 ALTALINK TE 87s Protection & Control (87s Gaetz) relay setting and wiring changes to A87/W138B & B87/W138B 9.33 Days
Continuous		  
16-Mar-26 08:00 20-Mar-26 15:00 CMH Outage MH-30L (MHS-3 Southridge - MHS-5 NE Crescent Heights), MHS-3 MH69-308 (MHS-3 Southridge), MHS-5 MH69-502 (MHS-5 NE Crescent Heights) replacing broken transmission pole 65866, inspection and preventative maintenance 4.29 Days
Continuous		  
16-Mar-26 08:00 19-Mar-26 16:00 ENMAX Outage 162.2TR (SS-162) investigate tap changer oil leak. oil sampling, relay fault pressure test, reversing switch check. transformer and gas monitor maintenance 3.33 Days
Continuous		  
16-Mar-26 08:00 19-Mar-26 16:00 ALTALINK TE AML 793s RTU/SCADA (AML 793s Horse Creek), AltaLink Telecom Equipment firewall program - 1 firewall, 1 lan switch, 2 mpls nodes, 1 mpls raw socket 3.33 Days
Continuous		  
16-Mar-26 08:00 19-Mar-26 16:00 ALTALINK TE 478s RTU/SCADA (478s Tucuman) upgrade firewall and LAN switch 3.33 Days
Continuous		  
16-Mar-26 08:00 20-Mar-26 16:00 ENMAX TE Protection & Control (SS-162) 162 sub 86-Z44A, 86-Z44B lockout relay, 87-Z44A, 87-Z44B differential protection outage. relay protection test 4.33 Days
Daily		  
16-Mar-26 08:00 19-Mar-26 16:00 ENMAX TE Protection & Control (SS-162) 162.2TR 86-T2A, 86-T2B lockout relay outage. relay protection test - 162RLY138/240 - 86 Lockouts. 3.33 Days
Continuous		  
16-Mar-26 08:00 20-Mar-26 17:30 ATCO TE 2075s Protection & Control (2075s Newell) PRC-005 relay testing on AC filter 1 protection & AC filter 1 connection protection 4.4 Days
Continuous		  
16-Mar-26 08:00 20-Mar-26 16:00 ENMAX Outage 9.83L (SS-9 - SS-43), 9B138-9.83 (SS-9), 43B138-9.83 (SS-43) 9B138-9.83 CT junction box replacement, power factor test, capacitor bank maintenance, oil sampling, sheath testing, O-ring replacement 4.33 Days
Continuous		  
16-Mar-26 08:00 19-Mar-26 16:00 ENMAX Outage 47B138-771/1 (SS-47) investigate the leak and possible repair 3.33 Days
Continuous		  
16-Mar-26 09:00 19-Mar-26 16:00 ATCO, ALTALINK IO 788L (898s Heart Lake - 788AL tap) component replacement on 788L (STR 157 - 218) 3.29 Days
Continuous		  
16-Mar-26 09:00 20-Mar-26 17:00 ALTALINK Outage 773L (127s Bruderheim - 308s Albchem Beaverhill Creek), 308s 773E (308s Albchem Beaverhill Creek), 127s 773W (127s Bruderheim) CT replacement associated with 308s773E. 4.33 Days
Continuous		  
16-Mar-26 09:00 19-Mar-26 16:00 ATCO, ALTALINK Outage 788L (898s Heart Lake - 788AL tap) component replacement on 788L (STR 157 - 218) 3.29 Days
Continuous		  
16-Mar-26 09:00 19-Mar-26 17:00 BHE Canada Outage MATL (120s Picture Butte - Montana) align with 1201L outage (mitigation for 5L92), RTU replacement work will be done during this outage 3.33 Days
Continuous		 AB-MATL
16-Mar-26 10:00 26-Mar-26 16:00 ALTALINK, Lethbridge Outage 618s 824 (618s Riverbend), 824L (593s Lakeview - 618s Riverbend), 593s 824L (593s Lakeview) replace 593s1-disconnect switch and 593sPTL1-CVT. 10.25 Days
Continuous		  
16-Mar-26 10:00 20-Mar-26 17:30 ATCO TE 768s Protection & Control (768s Rowley) PRC-005 relay testing 4.31 Days
Continuous		  
16-Mar-26 10:00 20-Mar-26 14:00 ATCO RB 7L08 (830s Carmon - 834s Wesley Creek) maintenance program, 32 pole changes, 21 crossarm changes, other structure deficiencies 4.17 Days
Continuous		  
16-Mar-26 10:00 19-Mar-26 15:00 ATCO IO 898s 708 (898s Heart Lake) isolating 788L for ALtalInk 3.21 Days
Continuous		  
16-Mar-26 11:00 19-Mar-26 16:00 ALTALINK TE 158s Protection & Control (158s Vauxhall) 2026 GE DSP card replacements CRU

3.21 Days
Continuous		  
16-Mar-26 12:00 20-Mar-26 17:00 ATCO TE ATCO Telecom Equipment replacement of existing damaged elliptical wave guide
 4.21 Days
Continuous		  
16-Mar-26 12:00 20-Mar-26 12:00 ALTALINK Outage 163s 1752 (163s Amoco Empress), 163s 1552 (163s Amoco Empress), 1002L (163s Amoco Empress - 275s Jenner) urgent protection change, salvage old over voltage protections and incorporate overvoltage SPS2608 into 1002L Line protections 4 Days
Continuous		  
16-Mar-26 12:00 20-Mar-26 12:00 ALTALINK TE 163s RTU/SCADA (163s Amoco Empress) update RTU config for 1002L protection replacement 4 Days
Continuous		  
16-Mar-26 12:00 19-Mar-26 16:00 ATCO TE 898s Protection & Control (898s Heart Lake) PRC-005 relay testing 3.17 Days
Continuous		  
16-Mar-26 12:00 20-Mar-26 07:59 ATCO Outage 813s 705 (813s Little Smoky) emergency 705CT replacement 3.83 Days
Continuous		  
16-Mar-26 12:00 20-Mar-26 17:00 ATCO TE 813s Protection & Control (813s Little Smoky) relay isolations and CT shorting in conjunction with GOI on BKR 705 4.21 Days
Continuous		  
16-Mar-26 13:00 30-Mar-26 17:00 ATCO TE 882s Protection & Control (882s Triangle) Block 701T protection to test trip/close of breaker 503 and to test inter-relay signals to new 5L482 relay 14.17 Days
Continuous		  
16-Mar-26 13:00 19-Mar-26 17:00 ALTALINK TE 602s RTU/SCADA (602s Cold Creek) RTU database update 3.17 Days
Continuous		  
16-Mar-26 13:18 31-Mar-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), 510s 41 (510s Sunnybrook), 510s 43 (510s Sunnybrook), 510s 4289 (510s Sunnybrook), AML 511s 1489 (AML 511s Crossings) forced outage 15.2 Days
Continuous		  
16-Mar-26 15:00 26-Mar-26 12:00 ALTALINK Outage 717L (17s Benalto - 262s Rocky Mountain House), 17s 717W (17s Benalto), 262s 717E (262s Rocky Mountain House) 717L component replacement 9.88 Days
Continuous		  
17-Mar-26 08:00 19-Mar-26 20:00 SUNCOR TE 29EDD-94 RTU/SCADA (29EDD-94 Voyageur) replacement of the 29EDD-94H network switch (switch #4) with a new one 2.5 Days
Continuous		  
17-Mar-26 08:00 19-Mar-26 16:00 ALTALINK TE 409s RTU/SCADA (409s Shell Scotford) SCADA VLAN split 2.33 Days
Continuous		  
17-Mar-26 08:00 23-Mar-26 16:00 CMH TE MHS-7 Protection & Control (MHS-7 Brier Park) remove TPR-138-T71-A protection from service for element and functional testing 6.33 Days
Continuous		  
17-Mar-26 09:00 26-Mar-26 18:00 ALTALINK Outage 394s T2 (394s Empress) 394sVR2 replacement 9.38 Days
Continuous		  
18-Mar-26 07:00 19-Mar-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) 87T-51HV/702T settings change 1.44 Days
Continuous		  
18-Mar-26 08:00 19-Mar-26 17:00 ALTALINK Outage 163s 1752 (163s Amoco Empress), 163s 1552 (163s Amoco Empress), 1002L (163s Amoco Empress - 275s Jenner) component replacement on 1002L (STR 67-99) 1.38 Days
Continuous		  
18-Mar-26 08:00 19-Mar-26 16:00 ENMAX TE Protection & Control (SS-36) 36 sub zone 32 138kV bus differential protection (87) and lockout relay (86) outage, relay lockout testing 36RLY138ZONE 31. 36.5TR outage required 1.33 Days
Daily		  
18-Mar-26 08:00 19-Mar-26 16:00 ENMAX Outage 16.63L (SS-16 - SS-36), 36.5TR (SS-36), 36B69-16.63/36.5TR (SS-36), 16B69-16.63 (SS-16) 36.5TR 138kV zone 31 and zone 32 relays lockout testing 1.33 Days
Continuous		  
18-Mar-26 08:00 19-Mar-26 16:00 ENMAX TE Protection & Control (SS-36) 36 sub Zone 31 138kV bus differential protection (87) and lockout relay (86) outage, lockout testing 36RLY138ZONE 31. 36.5TR outage required 1.33 Days
Daily		  
18-Mar-26 08:00 20-Mar-26 16:00 ALTALINK TE 149s RTU/SCADA (149s Nisku) SCADA VLAN split 2.33 Days
Continuous		  
18-Mar-26 09:00 19-Mar-26 17:00 ALTALINK RB 945L (275s Jenner - 562s Cypress) urgent RB required to work safely in proximity during 1002L work. 1.33 Days
Continuous		  
19-Mar-26 07:00 19-Mar-26 17:00 EPCOR Outage 1098L (EP 805s Jasper - Poundmaker), EP 805s J2401 (EP 805s Jasper), EP 805s J2407 (EP 805s Jasper) 1098L: Emergency Outage for Large Equipment Access for TX3 Bushing Replacement 10 Hours
Continuous		  
19-Mar-26 08:00 28-Mar-26 16:00 ALTALINK Outage 132s 51 (132s Ware Junction), 132s 55 (132s Ware Junction), 28s 5 (28s West Brooks), 28s 8 (28s West Brooks), 931L (28s West Brooks - 132s Ware Junction), 132s 931 (132s Ware Junction), 28s 931N (28s West Brooks) urgent replacement of 28s 931L A - protection 9.33 Days
Continuous		  
19-Mar-26 08:00 19-Mar-26 16:00 ATCO, ALTALINK Outage 923L (356s Milo - 2075s Newell) repair interphase spacer 8 Hours
Continuous		  
19-Mar-26 08:00 19-Mar-26 16:00 ALTALINK RB 935L (324s Cassils - 356s Milo) 935L reclose block required during 923L149 urgent repair to replace damaged interphase spacer 8 Hours
Continuous		  
19-Mar-26 08:00 20-Mar-26 16:00 ALTALINK, DOW TE 166s RTU/SCADA (166s Dow Chemical Fort Saskatchewan) SCADA VLAN split - loss of visibility of 166s for 15 minutes in the timeframe indicated 1.33 Days
Continuous		  
19-Mar-26 08:00 19-Mar-26 17:00 ATCO TE ATCO Telecom Equipment Vegreville_T(SCC)-Telecom- Vegreville Tower upgrading dynamic load rating server for bug fixes 9 Hours
Continuous		  
19-Mar-26 08:30 19-Mar-26 11:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) reclose block required on 760L at163s for ATCO telecom work 3 Hours
Daily		  
19-Mar-26 08:30 19-Mar-26 16:00 ALTALINK, DOW TE 166s Protection & Control (166s Dow Chemical Fort Saskatchewan) setting changes 7.5 Hours
Continuous		  
19-Mar-26 09:00 19-Mar-26 11:00 ATCO, BSSL TE ATCO Telecom Equipment, 1004s RTU/SCADA (1004s Bullseye), 772s RTU/SCADA (772s Youngstown), 893s RTU/SCADA (893s Cavendish), 914s RTU/SCADA (914s Bindloss) upgrading Pollockville, Bullseye, Cappon and Youngstown Tower SARs
 2 Hours
Continuous		  
19-Mar-26 09:00 19-Mar-26 11:00 ATCO, ALTALINK RB 7L760 (767s Oyen - 7LC760 tap), 7L760 (7LA760 tap - 7LC760 tap), 760L (760AL tap - 7LA760 tap) need reclosing disabled on 7L760 for telecom request 2 Hours
Continuous		  
19-Mar-26 09:00 19-Mar-26 16:00 ALTALINK TE 132s RTU/SCADA (132s Ware Junction) port 3 on LAN-ES has failed. techs will have to tests ports P15-P20 to find working port 7 Hours
Continuous		  
19-Mar-26 10:00 19-Mar-26 16:00 ALTALINK Outage 422s 694 (422s Westwood), 54s 694 (54s Fort Saskatchewan), 694L (54s Fort Saskatchewan - 422s Westwood), 422s T1 (422s Westwood), 422s 189 (422s Westwood) 54s2 & 422s3 switch hot spot repair 6 Hours
Continuous		  
19-Mar-26 10:30 19-Mar-26 16:30 ATCO TE 741s RTU/SCADA (741s Fox Creek) scada updates for EPSS alarm and control 6 Hours
Continuous		  
19-Mar-26 12:00 19-Mar-26 17:00 ALTALINK TE 120s RTU/SCADA (120s Picture Butte) RTU outage 5 Hours
Continuous		  
20-Mar-26 08:00 20-Mar-26 17:00 ALTALINK Outage 935L (324s Cassils - 356s Milo) repair failed interphase spacer 9 Hours
Continuous		  
20-Mar-26 08:00 20-Mar-26 17:00 ATCO Outage 813s 705 (813s Little Smoky), 7L46 (813s Little Smoky - 845s Big Mountain), 813s 706 (813s Little Smoky) emergency 705CT replacement in conjunction with 1-00517982 9 Hours
Continuous		  
20-Mar-26 08:00 20-Mar-26 17:00 ATCO, ALTALINK RB 923L (356s Milo - 2075s Newell) 923L reclose block required for 935L103 urgent repair work to replace damaged interphase spacer, due to proximity to 923L 9 Hours
Continuous		  
21-Mar-26 07:00 21-Mar-26 17:00 EPCOR TE RTU/SCADA (EPCOR Riverview) substation firewall replacement – full communications outage 10 Hours
Continuous		  
21-Mar-26 08:00 21-Mar-26 16:00 ALTALINK TE 852s RTU/SCADA (852s Round Hill) split the existing SCADA VLAN 8 Hours
Continuous		  
21-Mar-26 08:00 21-Mar-26 12:00 ENMAX Outage 1.1TR (SS-1) replace PRD microswitch enclosure 4 Hours
Continuous		  
21-Mar-26 12:00 21-Mar-26 16:00 ENMAX Outage 1.3TR (SS-1) replace PRD microswitch enclosure 4 Hours
Continuous		  
22-Mar-26 07:00 27-Mar-26 17:00 EPCOR Outage 72JW19 (EP 805s Jasper - Woodcroft), T1 (Woodcroft), W721 (Woodcroft), W722 (Woodcroft), EP 805s J724 (EP 805s Jasper), WAB1 (Woodcroft), EP 805s JDS28 (EP 805s Jasper) Woodcroft - TX1 LCR civil (pile installs) 5.42 Days
Continuous		  
22-Mar-26 08:00 22-Mar-26 18:00 ENMAX Outage 9.80L (SS-9 - SS-31), 31.1TR (SS-31), 31.2TR (SS-31), 31.1C (SS-31), 31B138-9.80 (SS-31), 31MD138-31.1TR (SS-31), 31MD138-31.2TR (SS-31), SW84 (SS-31) spring substation washing - reversing switch check - 31.1TC, 31.2-TC 10 Hours
Continuous		  
23-Mar-26 07:00 27-Mar-26 17:00 EPCOR Outage 805s T3 (805s Jasper), EP 805s J2404 (EP 805s Jasper), EP 805s J2405 (EP 805s Jasper), EP 805s JAB3 (EP 805s Jasper) Jasper T3 relay maintenance and scaffold removal 4.42 Days
Continuous		  
23-Mar-26 07:00 23-Mar-26 17:00 EPCOR Outage T2 (Rossdale), R721 (Rossdale), R723 (Rossdale), RAB2 (Rossdale) Rossdale RDS5 repair 10 Hours
Continuous		  
23-Mar-26 07:00 28-Mar-26 16:00 ALTALINK TE 28s RTU/SCADA (28s West Brooks) add new ACC alarms 5.38 Days
Continuous		  
23-Mar-26 07:00 27-Mar-26 17:00 EPCOR Outage 72RV6 (EP 511s Victoria - Rossdale), RV722 (Rossdale), EP 511s VDS9 (EP 511s Victoria) Rossdale RV722 breaker upgrade project 4.42 Days
Continuous		  
23-Mar-26 07:00 27-Mar-26 17:00 EPCOR Outage EP 511s Victoria T1 (EP 511s Victoria) Victoria TX1 oil level repairs 4.42 Days
Continuous		  
23-Mar-26 07:00 27-Mar-26 17:00 EPCOR Outage T2 (Rossdale) Rossdale: TX2, Oil Level Repairs w/Vendor 4.42 Days
Continuous		  
23-Mar-26 07:00 26-Mar-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) SCADA change for CETO 3.42 Days
Daily		  
23-Mar-26 07:00 24-Mar-26 17:00 EPCOR Outage T1 (Kennedale) Kennedale TX1 cable repair 1.42 Days
Continuous		  
23-Mar-26 07:15 26-Mar-26 17:45 ALTALINK Outage 633L (56s Boyle - 405s Waupisoo), 405s 633 (405s Waupisoo), 56s 633 (56s Boyle) component replacement on 633L15 3.44 Days
Continuous		  
23-Mar-26 07:30 26-Mar-26 16:00 ALTALINK Outage AML 511s 1152 (AML 511s Crossings), AML 511s T30 (AML 511s Crossings) firmware upgrades on protections that are OOS 3.35 Days
Continuous		  
23-Mar-26 08:00 31-Mar-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole and cross arm replacement from T&T 8.33 Days
Continuous		  
23-Mar-26 08:00 23-Mar-26 12:00 ENMAX, ALTALINK Outage 28.80L (42s Sarcee - SS-28) 1 sub Transmission line cut over. 4 Hours
Continuous		  
23-Mar-26 08:00 26-Mar-26 16:00 ALTALINK Outage 514L (513s Lundbreck - 514BL tap), 513s T1 (513s Lundbreck), 513s 1 (513s Lundbreck) line maintenance 3.33 Days
Continuous		  
23-Mar-26 08:00 26-Mar-26 17:00 ALTALINK IO 405s 633 (405s Waupisoo), 56s 633 (56s Boyle), 633L (56s Boyle - 405s Waupisoo) component replacement on str 15 3.38 Days
Continuous		  
23-Mar-26 08:00 23-Mar-26 18:00 ENMAX Outage 9.80L (SS-9 - SS-31), 9.1TR (SS-9) Spring Substation Washing. Reversing Switch Check - 9.1-TC 10 Hours
Continuous		  
23-Mar-26 08:00 26-Mar-26 18:00 ENMAX Outage 162.1TR (SS-162) Investigate tap changer oil leak. Oil Sampling MT, TC, Bushing. Relay Fault Pressure Test. Reversing Switch Check. Transformer Monitor Maintenance. Gas Monitor Maintenance. I&R Settings Issue on 162.1TR T60 3.42 Days
Continuous		  
23-Mar-26 08:00 26-Mar-26 16:00 ALTALINK TE 62s RTU/SCADA (62s Brazeau Plant), 489s RTU/SCADA (489s Petro Canada Brazeau River) upgrade firewall and LAN switch 3.33 Days
Continuous		  
23-Mar-26 08:00 02-Apr-26 16:00 ALTALINK Outage 347s 199W (347s AML Fox Creek) breaker 347s199W breaker replacement 10.33 Days
Continuous		  
23-Mar-26 08:00 23-Mar-26 16:00 ENMAX TE Protection & Control (SS-28) 28 sub BMR 80 outage 8 Hours
Daily		  
23-Mar-26 08:00 23-Mar-26 16:00 ENMAX TE Protection & Control (SS-20) 20 sub BMR 81 outage 8 Hours
Daily		  
23-Mar-26 08:00 25-Mar-26 16:00 ALTALINK TE 5s RTU/SCADA (5s East Calgary), AltaLink Telecom Equipment firewall replacement and MPLS node upgrade 7705A/B 2.33 Days
Continuous		  
23-Mar-26 08:00 26-Mar-26 16:00 ENMAX TE Protection & Control (SS-162) 162.1TR 86-T1A, 86-T1B lockout relay outage -relay protection test - 162RLY138/240 - 86 lockouts 3.33 Days
Continuous		  
23-Mar-26 08:00 27-Mar-26 16:00 ENMAX TE Protection & Control (SS-162) 162 sub 86-Z43A, 86-Z43B lockout relay, 87-Z43A, 87-Z43B differential protection outage - relay protection test - 162RLY138/240 - 86 lockouts 86-Z43-A, 86-Z43-B 4.33 Days
Daily		  
23-Mar-26 08:00 24-Mar-26 16:00 ALTALINK TE 245s RTU/SCADA (245s Seebe) SCADA VLAN split 1.33 Days
Continuous		  
23-Mar-26 08:00 24-Mar-26 16:00 ALTALINK TE 504s RTU/SCADA (504s Queenstown) SCADA VLAN split 1.33 Days
Continuous		  
23-Mar-26 08:00 26-Mar-26 16:00 ALTALINK TE 254s RTU/SCADA (254s Coaldale), AltaLink Telecom Equipment firewall replacement and LAN switch replacement and MPLS node upgrade 7705A/B 3.33 Days
Continuous		  
23-Mar-26 08:00 23-Mar-26 09:00 CMH, ALTALINK TE MHS-7 RTU/SCADA (MHS-7 Brier Park), 882L (MHS-7 Brier Park - 321s Al Rothbauer) Updating the firmware on the SEL 2730M network switches in the substation. We will lose visibility on devices in the substation during this time, and the RAS173 will be offline for duration of outage. 60 Mins
Continuous		  
23-Mar-26 08:00 27-Mar-26 17:00 ATCO, USPCE RB 7L15 (841s Long Lake - 856s Kinosis) complete 7L15 pole changes, live line work 4.38 Days
Daily		  
23-Mar-26 08:00 23-Mar-26 12:00 ENMAX TE Protection & Control (SS-28) 28 sub zone 31 138 kV bus differential protection outage 4 Hours
Daily		  
23-Mar-26 08:30 23-Mar-26 16:00 ENMAX TE Protection & Control (SS-39) 39 sub auto switching protection scheme outage 7.5 Hours
Continuous		  
23-Mar-26 09:00 23-Mar-26 10:00 ATCO TE ATCO Telecom Equipment, 709s RTU/SCADA (709s Vegreville), 710s RTU/SCADA (710s Vermilion) Vermilion_S-Telecom/Vegreville_S-Telecom upgrade
 60 Mins
Continuous		  
23-Mar-26 09:00 23-Mar-26 10:00 ATCO RB 7L65 (710s Vermilion - 7LA65 tap) disable reclosing on 7L65 for the duration of the Vermilion/Vegreville telecom (1-514421) outage to prevent line out-of-sync closing 60 Mins
Continuous		  
23-Mar-26 09:00 27-Mar-26 17:00 ALTALINK Outage 834L (320p Keephills - 384s Keystone), 320p 834X (320p Keephills), 384s 834 (384s Keystone) breaker CT replacement

4.33 Days
Continuous		  
23-Mar-26 09:00 23-Mar-26 12:00 ALTALINK TE 69s Protection & Control (69s North Barrhead) remote settings change 3 Hours
Continuous		  
23-Mar-26 09:00 25-Mar-26 18:00 SUNCOR TE 29EDD-1 RTU/SCADA (29EDD-1 Millennium) upgrade switch number 8 firmware and reboot switch 2.38 Days
Continuous		  
23-Mar-26 09:30 23-Mar-26 16:30 ATCO TE 739s RTU/SCADA (739s Edith Lake) SCADA updates for EPSS alarm and control 7 Hours
Continuous		  
23-Mar-26 10:00 23-Mar-26 11:00 ATCO TE ATCO Telecom Equipment, 819s Whitby Lake RTU/SCADA, 707s RTU/SCADA (707s St. Paul) StPaul_S-Telecom/Whitby Lake_S-Telecom
 60 Mins
Continuous		  
23-Mar-26 10:00 24-Mar-26 16:00 ATCO TE 856s Protection & Control (856s Kinosis) PRC-005 aux trip relay testing for 87BA and 87BB/900BS1, 87BA and 87BB/900BS2, 87TA and 87TB/902T, 87TA and 87TB/903T 30 Hours
Continuous		  
23-Mar-26 10:00 27-Mar-26 14:00 ATCO RB 7L08 (830s Carmon - 834s Wesley Creek) maintenance program, 32 pole changes, 21 crossarm changes, other structure deficiencies 4.17 Days
Continuous		  
23-Mar-26 11:00 26-Mar-26 16:00 ALTALINK TE 237s Protection & Control (237s Foothills) 237s 2026 DSP Card replacements , Relay maintenance redundant: T1, T2, B138B1, B240B1, B138B2, and Non redundant breaker fails: s152, s252, s552, s652, s2152, s2352, s2452, s2552, s2652, One at a time no more than 6hrs restored at the end of each day.
3.21 Days
Continuous		  
23-Mar-26 11:00 25-Mar-26 16:00 ALTALINK TE 38s Protection & Control (38s East Edmonton) protection replacement 2.21 Days
Continuous		  
23-Mar-26 11:00 25-Mar-26 16:00 ALTALINK TE 309s Protection & Control (309s Anthony Henday) protection replacement 2.21 Days
Continuous		  
23-Mar-26 11:00 25-Mar-26 16:00 ALTALINK TE 286s Protection & Control (286s Yasa) protection replacement 2.21 Days
Continuous		  
23-Mar-26 12:00 23-Mar-26 16:00 ENMAX Outage 20.82L (SS-20 - SS-21), 20B138-20.82 (SS-20), 21B138-20.82 (SS-21) 1 sub transmission line cut over, reconnect and function bft from bmr 81 4 Hours
Continuous		  
23-Mar-26 12:00 26-Mar-26 16:00 ATCO TE 898s Protection & Control (898s Heart Lake) PRC-005 relay testing, relay software vulnerability upgrade 3.17 Days
Continuous		  
23-Mar-26 12:00 26-Mar-26 16:00 ALTALINK Outage 430s 452 (430s Ursus) Replace 430s452 Breaker CTs. 3.17 Days
Continuous		  
23-Mar-26 12:00 27-Mar-26 12:00 ATCO RB 7L121 (917s Horse River - 7LA121 tap) changing structure 99, 100, 101 due to L-G violations 4 Days
Continuous		  
23-Mar-26 12:00 26-Mar-26 17:00 ATCO Outage 813s 706 (813s Little Smoky) emergency 706CT east replacement 3.21 Days
Continuous		  
23-Mar-26 12:00 26-Mar-26 17:00 ATCO TE 813s Protection & Control (813s Little Smoky) Replacing 706CT East due to extreme risk 3.21 Days
Continuous		  
23-Mar-26 13:00 26-Mar-26 09:00 ATCO Outage 2033s 704C (2033s Mowat) PRC trip coil testing BKR 704 and protection testing 2.83 Days
Continuous		  
23-Mar-26 13:00 23-Mar-26 16:30 ENMAX, ALTALINK RB 36.81L (44s Bearspaw Plant - SS-36) PRC5 - Altalink 44s36.81E first trip, minor maintenance 3.5 Hours
Continuous		  
23-Mar-26 13:00 28-Mar-26 16:30 ALTALINK Outage 65s T3 (65s High River), 65s 812W (65s High River) 65sT3 Oil leak repair. Doble + TC maintenance. 5.15 Days
Continuous		  
23-Mar-26 13:00 23-Mar-26 16:00 ALTALINK TE 394s Protection & Control (394s Empress) PRC maintenance/standard maintenance 3 Hours
Continuous		  
23-Mar-26 13:00 26-Mar-26 16:00 ALTALINK TE 72s RTU/SCADA (72s Leismer) update alarm points/data during meter module replacements
3.13 Days
Continuous		  
23-Mar-26 13:30 23-Mar-26 16:00 ALTALINK, REDDEER Outage 217s 768 (217s North Red Deer), 768L (209s Timberlands - 217s North Red Deer) PRC5 Breaker Maint & First Trip 2.5 Hours
Continuous		  
23-Mar-26 14:00 27-Mar-26 14:00 ATCO Outage 7L89 (721s La Corey - 826s Marguerite Lake) replace 2 white tagged poles which failed test and trat inspection, 7L89 poles on structures 7L89/7L91-225 and 7L89/7L91-230 4 Days
Continuous		  
23-Mar-26 14:00 26-Mar-26 16:00 ALTALINK Outage 310p 1852 (310p Sundance) 310s1852 240kV breaker maintenance 3.08 Days
Continuous		  
23-Mar-26 14:00 24-Mar-26 16:00 ALTALINK Outage 89s T2 (89s Ellerslie) Replace Oil level gauges & Modify qualitrol temps 26 Hours
Continuous		  
23-Mar-26 14:00 23-Mar-26 16:00 ALTALINK Outage 377s 769X (377s AML Hardisty) 138kV breaker maintenance 2 Hours
Continuous		  
24-Mar-26 05:00 24-Mar-26 07:00 EPCOR TE EPCOR system operations centre HJB service center firewall patching 2 Hours
Continuous		  
24-Mar-26 08:00 27-Mar-26 14:00 ATCO RB 7L91 (715s Leming Lake - 826s Marguerite Lake) pole replacement on 7L89 poles on double circuit structures 7L89/7L91-225 and 7L89/7L91-230 3.25 Days
Daily		  
24-Mar-26 08:00 24-Mar-26 17:00 ALTALINK Outage 700L (746s Sherwood Park - 746L tap), 746s 700N (746s Sherwood Park), 422s 700 (422s Westwood) 700L line maintenance 9 Hours
Continuous		  
24-Mar-26 08:00 24-Mar-26 14:00 ENMAX Outage 33.1TR (SS-33), 33.83L (SS-33 - SS-41) Spring Substation Washing. 33.1TR already out of service. 6 Hours
Continuous		  
24-Mar-26 08:00 26-Mar-26 16:00 ALTALINK TE 250p RTU/SCADA (250P Bighorn Plant) RTU database update 2.33 Days
Continuous		  
24-Mar-26 08:00 29-Mar-26 17:00 ALTALINK Outage 99s 747X (99s North St. Albert), 747L (99s North St. Albert - 711L tap) Replace and relocate various structures 5.38 Days
Continuous		  
24-Mar-26 08:00 24-Mar-26 16:00 ENMAX Outage 7.84L (SS-7 - SS-36), 36B138-7.84 (SS-36) 36B138-7.84- investigate SF6 leak. HV Breaker SF6 Gas Sample - 36B138-7.84 8 Hours
Continuous		  
24-Mar-26 08:00 02-Apr-26 15:00 CMH TE MHS-7 Protection & Control (MHS-7 Brier Park) PRC-005 testing - remove TPR-138-T71-B from service to complete element, functional 9.29 Days
Continuous		  
24-Mar-26 08:00 24-Mar-26 17:00 ALTALINK Outage 348s 152 (348s Marlboro), 348s T1 (348s Marlboro) customer maintenance on T1 NGR. Rising Edge to ground as part of the outage. 9 Hours
Continuous		  
24-Mar-26 09:00 24-Mar-26 11:00 ATCO, ALTALINK, SHELL, ATCOP TE ATCO Telecom Equipment, 879s Scotford Upgrader RTU/SCADA, 402s RTU/SCADA (402s Scotford Expansion 1), 2013s Drummond, 947s RTU/SCADA (947s Weasel Creek) Weasel Creek_S-telecom/Deerland_S_telecom - upgrading 'A' SAR OS to v21 then v22 2 Hours
Continuous		  
24-Mar-26 09:30 24-Mar-26 11:30 ALTALINK Outage 703L (377s AML Hardisty - 703BL tap), 377s 703E (377s AML Hardisty) 138kV breaker maintenance 2 Hours
Continuous		  
24-Mar-26 09:30 24-Mar-26 16:30 ATCO TE 739s RTU/SCADA (739s Edith Lake) SCADA updates for EPSS alarm and control 7 Hours
Continuous		  
24-Mar-26 14:00 24-Mar-26 16:00 ENMAX Outage 33.84L (SS-33 - SS-43) spring substation washing, 33B138-33.84L bay only 2 Hours
Continuous		  
25-Mar-26 07:00 25-Mar-26 17:00 EPCOR Outage N722 (Namao) breaker maintenance 10 Hours
Continuous		  
25-Mar-26 08:00 25-Mar-26 16:00 ALTALINK TE AltaLink Telecom Equipment replace MDA 1 due to errors on occurring on the card 8 Hours
Continuous		  
25-Mar-26 08:00 25-Mar-26 12:00 ENMAX Outage 2.80L (SS-2 - SS-23), 23.3TR (SS-23) Spring Substation Washing. Reversing Switch Check - 23.3-TC 4 Hours
Continuous		  
25-Mar-26 08:00 25-Mar-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 906s Protection & Control (906s Ross Creek), 906s RTU/SCADA (906s Ross Creek) repair radio 8 Hours
Continuous		  
25-Mar-26 08:00 25-Mar-26 16:00 ALTALINK TE AML 511s RTU/SCADA (AML 511s Crossings) SCADA VLAN split 8 Hours
Continuous		  
25-Mar-26 08:00 25-Mar-26 16:00 ENMAX TE Protection & Control (SS-65) 65 sub 86BF D82 lockout relay protection outage - relays, lockout testing 65RLY138-D82 8 Hours
Continuous		  
25-Mar-26 09:00 25-Mar-26 16:30 ATCO TE 791s RTU/SCADA (791s Rainbow Lake) SCADA updates for EPSS alarm and control 7.5 Hours
Continuous		  
25-Mar-26 09:00 26-Mar-26 16:00 ATCO TE 734s Protection & Control (734s Sturgeon) updating relay settings on 701T and 702T 31 Hours
Continuous		  
25-Mar-26 09:30 25-Mar-26 11:30 ALTALINK Outage 574s 852 (574s Nilrem) PRC5 Breaker Maint & First Trip 2 Hours
Continuous		  
25-Mar-26 09:30 25-Mar-26 11:30 ALTALINK Outage 320p 552 (320p Keephills) breaker maintenance 2 Hours
Continuous		  
25-Mar-26 10:00 25-Mar-26 14:00 ALTALINK, TRANSALTA Outage 250p T1 (250p Bighorn Plant) maintenance 4 Hours
Continuous		  
25-Mar-26 10:00 25-Mar-26 16:00 ATCO Outage 856s 707C (856s Kinosis), 856s 707 (856s Kinosis) PRC-005 aux trip relay testing on 707C protection, prc-005 trip coli testing breaker 707 6 Hours
Continuous		  
25-Mar-26 10:00 26-Mar-26 16:00 ALTALINK TE 216s Protection & Control (216s Knightsbridge) standard relay maintenance 30 Hours
Continuous		  
25-Mar-26 12:00 25-Mar-26 18:00 ENMAX, ALTALINK Outage 23.80L (74s Janet - SS-23), 23.4TR (SS-23) spring substation washing 6 Hours
Continuous		  
25-Mar-26 12:00 25-Mar-26 18:00 ALTALINK IO 74s 23.80W (74s Janet) Spring Substation Washing
6 Hours
Continuous		  
25-Mar-26 13:30 25-Mar-26 16:00 ALTALINK Outage 574s 752 (574s Nilrem) PRC5 Breaker Maint & First Trip 2.5 Hours
Continuous		  
25-Mar-26 13:30 25-Mar-26 16:00 ALTALINK Outage 320p 152 (320p Keephills) breaker maintenance 2.5 Hours
Continuous		  
26-Mar-26 07:00 26-Mar-26 17:00 EPCOR TE 330p RTU/SCADA (330p Genesee) substation firewall replacement – full communications outage 10 Hours
Continuous		  
26-Mar-26 08:00 26-Mar-26 18:00 ENMAX Outage 2.81L (SS-2 - SS-9), 9.83L (SS-9 - SS-43), 9.3TR (SS-9), 9.2TR (SS-9), 9B138-9.83 (SS-9), 9B138-2.81 (SS-9), 2MD138-2.81 (SS-2), 9B8-9.2TR (SS-9), 9MD138-9.2TR (SS-9), 9MD138-9.3TR (SS-9), 9BA8-9.3TR (SS-9), 9BB8-9.3TR (SS-9) spring substation washing, reversing switch check - 9.3-TC, -9.2-TC 10 Hours
Continuous		  
26-Mar-26 08:00 26-Mar-26 17:00 ATCO Outage 813s 706 (813s Little Smoky), 813s 705 (813s Little Smoky), 7L46 (813s Little Smoky - 845s Big Mountain) emergency 706CT east replacement 9 Hours
Continuous		  
26-Mar-26 08:00 26-Mar-26 16:00 ALTALINK TE AltaLink Telecom Equipment repair 9071R radio 8 Hours
Continuous		  
26-Mar-26 08:00 26-Mar-26 16:00 ENMAX TE Protection & Control (SS-65) 65 sub 86BF D83 lockout relay protection outage - relays, lockout testing 65RLY138-D83 8 Hours
Continuous		  
26-Mar-26 08:00 26-Mar-26 17:00 ALTALINK Outage 348s 252 (348s Marlboro), 348s T2 (348s Marlboro) customer maintenance on T2 NGR 9 Hours
Continuous		  
26-Mar-26 08:30 26-Mar-26 14:00 ALTALINK TE 263s Protection & Control (263s Strachan) on site settings change to remove ER excess trigger 718L A21/L7 SEL311C 5.5 Hours
Continuous		  
26-Mar-26 09:00 26-Mar-26 13:00 ATCO TE ATCO Telecom Equipment Poplar Hill telecom -
replace the temporary power supply for the Aprisa XE radio with the new one		 4 Hours
Continuous		  
26-Mar-26 09:00 26-Mar-26 11:30 ALTALINK Outage 63s T1 (63s Red Deer), 63s 24 (63s Red Deer) PRC5 maintenance and first trip 2.5 Hours
Continuous		  
26-Mar-26 09:00 26-Mar-26 16:30 ATCO TE 795s RTU/SCADA (795s Zama) SCADA updates for EPSS alarm and control 7.5 Hours
Continuous		  
26-Mar-26 09:30 26-Mar-26 16:00 ALTALINK Outage 320p 752 (320p Keephills) 320s752 breaker maintenance 6.5 Hours
Continuous		  
26-Mar-26 09:30 26-Mar-26 16:00 ALTALINK Outage 478s C1 (478s Tucuman) 478s552 breaker maintenance 6.5 Hours
Continuous		  
26-Mar-26 10:00 26-Mar-26 14:00 ALTALINK, TRANSALTA Outage 250p T2 (250p Bighorn Plant) maintenance 4 Hours
Continuous		  
26-Mar-26 10:00 26-Mar-26 16:00 ATCO Outage 856s 708C (856s Kinosis) PRC-005 - aux trip relay testing on 708C protection, trip coil testing breaker 708 6 Hours
Continuous		  
26-Mar-26 12:00 26-Mar-26 14:00 ALTALINK TE 256s Protection & Control (256s Harmattan) restore settings back to permanent settings for 717L project 2 Hours
Continuous		  
26-Mar-26 12:00 26-Mar-26 17:30 ALTALINK TE 378s Protection & Control (378s Shell Caroline) restore permanent relay settings at end of 717L line project 5.5 Hours
Continuous		  
26-Mar-26 12:00 26-Mar-26 17:30 ALTALINK TE 575s Protection & Control (575s Sundre) restore permanent P&C settings for 717L project 5.5 Hours
Continuous		  
26-Mar-26 13:30 26-Mar-26 16:00 ALTALINK Outage 63s T2 (63s Red Deer), 63s 25 (63s Red Deer) PRC5 maintenance & first trip 2.5 Hours
Continuous		  
27-Mar-26 07:00 27-Mar-26 17:00 EPCOR Outage 72CK12 (987s Clover Bar - Kennedale), 987s CK725 (987s Clover Bar) Cloverbar: CK725 (SF6) Breaker Maintenance 10 Hours
Continuous		  
27-Mar-26 07:00 27-Mar-26 19:00 ENMAX Outage 2.84L (SS-2 - SS-8) Install water mains over 2.84 line 12 Hours
Continuous		  
27-Mar-26 07:00 01-Apr-26 16:00 ALTALINK TE 347s RTU/SCADA (347s Fox Creek) add new ACC alarms for s199W breaker 5.38 Days
Continuous		  
27-Mar-26 08:00 27-Mar-26 12:00 ATCO TE ATCO Telecom Equipment replacing the non redundant firewall located at SOC2 4 Hours
Continuous		  
27-Mar-26 08:00 27-Mar-26 16:00 ENMAX TE Protection & Control (SS-65) 65 sub 86BF D84 lockout relay protection outage - relays, lockout testing 65RLY138-D84 8 Hours
Continuous		  

Prepared On:   2026-03-18   15:31:30

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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