Alberta Electric System Operator
System Co-ordination Plan
2025-06-20 to 2025-06-27
Approved Outages

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From To Owner Type Element Scheduled Activity Date/Time Comments Interconnection
05-Oct-18 08:00 30-Aug-25 16:00 EPCOR IO C2 (Rossdale) forced outage 2,521.33 Days
Continuous		  
24-Oct-18 01:13 30-May-27 16:00 EPCOR IO C1 (Rossdale) forced outage 3,140.62 Days
Continuous		  
27-Nov-23 08:00 01-Aug-25 16:00 ENMAX Outage 32.2TR (SS-32) 32 sub 32.2TR 8 kV bus switchgear demolition 613.29 Days
Continuous		  
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		  
03-Jan-25 07:00 27-Jun-25 17:00 EPCOR TE 805s Protection & Control (805s Jasper), 805s RTU/SCADA (805s Jasper) protection blocking for P&C maintenance at Jasper 175.38 Days
Continuous		  
24-Jan-25 00:00 31-Dec-25 16:00 ALTALINK Outage 74s C3 (74s Janet) forced outage 341.67 Days
Continuous		  
10-Feb-25 00:00 23-Dec-25 23:00 ATCO, ALTALINK IO 840s McNeill Station, 830L (562s Cypress - 840s McNeill Station), 840s 701T (840s McNeill Station), 840s 901T (840s McNeill Station) available for emergency use only 316.96 Days
Continuous		 AB-SK
11-Feb-25 10:00 23-Jul-25 16:00 ATCO TE 940s Protection & Control (940s Beartrap) relay testing 162.21 Days
Continuous		  
11-Mar-25 00:00 31-Dec-25 16:00 ALTALINK Outage 377s 473C (377s AML Hardisty) forced outage 295.71 Days
Continuous		  
18-Mar-25 14:00 17-Mar-26 17:30 ALTALINK Outage 217s C1 (217s North Red Deer) cap. bank unavailable and cannot be energized due to Koncar CTs being present 364.15 Days
Daily		  
20-Mar-25 08:00 20-Mar-26 17:00 ALTALINK Outage 263s C1 (263s Strachan) forced outage 365.38 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 03-Oct-25 17:00 EPCOR Outage 987s T1 (987s Clover Bar), 987s CCP7213 (987s Clover Bar), 987s CCP7214 (987s Clover Bar) Cloverbar - TX1 LCR 186.42 Days
Continuous		  
31-Mar-25 07:00 29-Aug-25 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) Cloverbar: protection blocking, 240 kV bus 3 differential for TX1 LCR duration 151.42 Days
Continuous		  
31-Mar-25 07:00 04-Jul-25 17:00 EPCOR TE Protection & Control (Woodcroft) Woodcroft: protection blocking for merging unit and protection upgrade. 95.42 Days
Continuous		  
12-May-25 08:00 29-Jun-25 16:00 ENMAX Outage 3.84L (SS-3 - SS-13), 3B138-3.84 (SS-3), 13B138-3.84 (SS-13) complete reconductoring of 3.84 line 48.33 Days
Continuous		  
14-May-25 04:01 14-Jul-25 07:30 ALTALINK Outage 799s T3 (799s Coleman) replace T3 61.15 Days
Continuous		  
14-May-25 08:00 10-Feb-26 16:00 ENMAX TE Protection & Control (SS-32) 32sub 138kV autoswitching protection outage 272.38 Days
Continuous		  
21-May-25 16:00 08-Jul-25 17:00 ATCO RB 7L20 (810s Dome Cutbank - 7L228 tap), 7L80 (740s H.R. Milner - 857s Kakwa Ridge), 7L80 (733s Simonette - 857s Kakwa Ridge) due to damaged structure on 7L20 48.04 Days
Continuous		  
25-May-25 07:00 01-Aug-25 17:00 EPCOR Outage 987s GT2 (987s Clover Bar) maintenance 68.42 Days
Continuous		  
29-May-25 17:31 30-Jun-25 00:00 BHE Canada Outage 120s C1 (120s Picture Butte) forced outage 31.27 Days
Continuous		 AB-MATL
01-Jun-25 14:44 27-Jun-25 17:00 ATCO Outage 7L94 (827s Cranberry Lake - 878s Kidney Lake) forced outage due to wildfire 26.09 Days
Continuous		  
02-Jun-25 07:00 27-Jun-25 17:00 EPCOR Outage 557s T1 (557s Castle Downs) S/S Tx1 bay outage 25.42 Days
Continuous		  
02-Jun-25 09:00 24-Jun-25 20:00 SUNCOR TE 29EDD-94 RTU/SCADA (29EDD-94 Voyageur), Suncor PMU fiber circuit testing at 29EDD-94 to investigate/fix the issues on PMU data 22.46 Days
Continuous		  
02-Jun-25 10:00 20-Jun-25 17:30 ATCO TE 813s Protection & Control (813s Little Smoky), 813s RTU/SCADA (813s Little Smoky) update DFR for AESO streaming

, replace 700PT disconnects
, wire 700PTY2 to DFR2
, replace 704PT disconnects
, wire 704PTY2 to DFR2
and install new satellite clock

- SCADA updates
 18.31 Days
Continuous		  
08-Jun-25 15:00 25-Nov-25 15:30 ALTALINK Outage 397s 864W (397s Benbow) new 864L line construction, new 397s48 (VT6) install 170.06 Days
Continuous		  
08-Jun-25 15:00 25-Jun-25 07:59 ALTALINK Outage 355s T1 (355s Chevron Knight), 355s T2 (355s Chevron Knight) maintenance, salvage 4.16kV cable bus associated with T2 16.71 Days
Continuous		  
09-Jun-25 07:00 20-Jun-25 17:00 EPCOR Outage 657s T2 (657s Summerside) Summerside - TX2 DGA LCR 11.42 Days
Continuous		  
09-Jun-25 07:00 27-Jun-25 17:00 EPCOR Outage 52s T1 (52s East Industrial), 52s E2401 (52s East Industrial) transformer T1 protection upgrade cutovers 18.42 Days
Continuous		  
09-Jun-25 07:00 20-Jun-25 17:00 EPCOR Outage T3 (Woodcroft), W722 (Woodcroft) T3 zone protection upgrade cutovers 11.42 Days
Continuous		  
09-Jun-25 07:00 01-Aug-25 17:00 EPCOR TE 330p Protection & Control (330p Genesee) 138/500 kV protection blocking for relay maintenance 53.42 Days
Continuous		  
09-Jun-25 07:00 15-Aug-25 17:00 EPCOR TE Protection & Control (Poundmaker) protection blocking for relay maintenance 67.42 Days
Continuous		  
09-Jun-25 13:30 30-Jun-25 18:00 ATCO Outage 716s 701C (716s Lloydminster) emergency maintenance 21.19 Days
Continuous		  
10-Jun-25 10:00 21-Jun-25 12:00 ALTALINK Outage 1012L (326s Murray Lake - 516s Forty Mile) complete the bus tie scope at the substation 11.08 Days
Continuous		  
12-Jun-25 08:00 23-Jun-25 17:00 ATCO TE 808s Protection & Control (808s Procter & Gamble) 7L13 21B relay replacement 11.38 Days
Continuous		  
12-Jun-25 08:00 23-Jun-25 17:00 ATCO TE 845s Protection & Control (845s Big Mountain), 845s RTU/SCADA (845s Big Mountain) 7L13 21B relay replacement and RTU changes required to incorporate new 21B relay 11.38 Days
Continuous		  
13-Jun-25 17:00 11-Feb-26 17:00 EPCOR Outage T3 (Rossdale) Rossdale - TX3 LCR 243.04 Days
Continuous		  
13-Jun-25 20:01 25-Jun-25 20:00 SUNCOR Outage 29PL6-2 (30EDD-1 - 29EDD-55), 30EDD-1 622T (30EDD-1), 30EDD-1 626 (30EDD-1), 30EDD-1 625 (30EDD-1), 30EDD-1 624 (30EDD-1), 30EDD-1 622TD (30EDD-1), 30EDD-1 29PL6-2CS (30EDD-1) 5 year preventive maintenance 12 Days
Continuous		  
14-Jun-25 08:00 30-Jun-25 18:00 ALTALINK Outage 38s C2 (38s East Edmonton) forced outage 16.42 Days
Daily		  
16-Jun-25 07:00 20-Jun-25 17:00 EPCOR Outage 1164L (816s Petrolia - EP Riverview), RW2402 (EP Riverview), RW2401 (EP Riverview), 816s P2403 (816s Petrolia), 816s P2404 (816s Petrolia) 1164L zone doble and relay maintenance 4.42 Days
Continuous		  
16-Jun-25 07:00 20-Jun-25 17:00 EPCOR Outage 72RV2 (EP 511s Victoria - Rossdale), RV728 (Rossdale), EP 511s V721 (EP 511s Victoria), EP 511s V729 (EP 511s Victoria), EP 511s VDS1 (EP 511s Victoria) doble and disconnect maintenance 4.42 Days
Continuous		  
16-Jun-25 07:00 21-Jun-25 17:00 EPCOR Outage 746AL (524s Owens Corning - 746L tap), 524s 6 (524s Owens Corning), 524s T1 (524s Owens Corning) TX1 bushing replacement and 746AL corona ring Install 5.42 Days
Continuous		  
16-Jun-25 07:00 23-Jun-25 18:00 ATCO, CNRL Outage 859s 702T (859s Primrose) 702T full testing including protections 7.46 Days
Continuous		  
16-Jun-25 07:00 22-Jun-25 19:00 ATCO RB 9L20 (755s Cordel - 766s Nevis) to complete stringing activities on CETO project adjacent to 9L20 6.5 Days
Daily		  
16-Jun-25 07:00 20-Jun-25 16:00 ALTALINK Outage 133s T1 (133s Stelco Edmonton), 133s T2 (133s Stelco Edmonton), 133s 1 (133s Stelco Edmonton), 133s 2 (133s Stelco Edmonton) install grounds 4.38 Days
Continuous		  
16-Jun-25 07:30 20-Jun-25 17:30 ALTALINK RB 514L (396s Pincher Creek - 514BL tap), 514L (513s Lundbreck - 514BL tap) south crew will be doing component replacement on 514L (Str 16-186)& (Str 452-453) Live Line 4.42 Days
Daily		  
16-Jun-25 08:00 20-Jun-25 17:00 ALTALINK TE 799s RTU/SCADA (799s Coleman) supervisory outages required for addition and testing of alarms/controls associated with new T3 and associated protection upgrade 4.38 Days
Daily		  
16-Jun-25 08:00 04-Jul-25 16:00 ENMAX Outage 31.1C (SS-31) capacitor bank switcher replacement, grounding improvements 18.33 Days
Continuous		  
16-Jun-25 08:00 20-Jun-25 17:00 ALTALINK TE 799s Protection & Control (799s Coleman) circuit cutover and testing 4.38 Days
Daily		  
16-Jun-25 08:00 01-Aug-25 17:00 ATCO TE 808s Protection & Control (808s Procter & Gamble), 808s RTU/SCADA (808s Procter & Gamble) SCADA upgrade at 808S. Protection and hardwired IO on-site will need to be cut-over to new SCADA system and tested 46.38 Days
Continuous		  
16-Jun-25 08:00 20-Jun-25 16:00 ENMAX Outage 27.2TR (SS-27) transformer maintenance and testing 4.33 Days
Continuous		  
16-Jun-25 09:00 25-Jun-25 17:00 BCH Outage 5L77 (BCH Ashton Creek - BCH Revelstoke G.S.) replace flashed and broken insulators


9.33 Days
Continuous		 AB-BC
16-Jun-25 10:00 20-Jun-25 17:30 ATCO Outage 959s 901T (959s Lanfine) transformer class 1 major testing, tap changer class 1 testing and qualitrol ITM/ETM settings updates 4.31 Days
Continuous		  
16-Jun-25 10:00 20-Jun-25 17:30 ATCO TE 959s Protection & Control (959s Lanfine), 959s RTU/SCADA (959s Lanfine) updates RTU 4.31 Days
Continuous		  
16-Jun-25 11:30 20-Jun-25 16:30 ALTALINK Outage 650s SVC (650s Hansman Lake), 650s T3 (650s Hansman Lake), 650s 252 (650s Hansman Lake), 650s 352 (650s Hansman Lake), 650s 489 (650s Hansman Lake) maintenance on SVC and breaker testing 4.21 Days
Continuous		  
16-Jun-25 12:00 20-Jun-25 16:00 ATCO Outage 885s 902T (885s McMillan), 885s 501R (885s McMillan) replace 1 single phase reactor in 501R,
902T major and tap changer refurbishment		 4.17 Days
Continuous		  
16-Jun-25 12:00 09-Jul-25 17:00 ATCO TE 845s Protection & Control (845s Big Mountain) block 50BF/702 relay as required to commission new connections associated with 21A/7L13 and 21B/7L13 relay replacements 23.21 Days
Continuous		  
16-Jun-25 12:00 09-Jul-25 17:00 ATCO TE 845s Protection & Control (845s Big Mountain) block 50BF/703 relay as required to commission new connections associated with 21A/7L13 and 21B/7L13 relay replacements 23.21 Days
Continuous		  
16-Jun-25 12:00 09-Jul-25 17:00 ATCO TE 845s Protection & Control (845s Big Mountain) block 21B/7L45 in order to perform 702PTY2 voltage injections needed for 21B/7L13 relay replacement 23.21 Days
Continuous		  
16-Jun-25 12:00 09-Jul-25 17:00 ATCO TE 845s Protection & Control (845s Big Mountain) block 21B/7L228 in order to perform 702PTY2 voltage injections needed for 21B/7L13 relay replacement 23.21 Days
Continuous		  
17-Jun-25 08:00 20-Jun-25 18:00 ATCO TE ATCO RTU/SCADA 6500S RTU - cutover from ATCO Electric control center to URICA control center, update and test new RTAC configurations 3.42 Days
Continuous		  
17-Jun-25 09:00 21-Jun-25 09:00 ALTALINK Outage 163s T1 (163s Amoco Empress) unbolt/re-connect cabling from Altalink bus into plains substation for cable testing 4 Days
Continuous		  
17-Jun-25 09:00 20-Jun-25 20:00 SUNCOR TE 29EDD-34 29-652-10202 (29EDD-34), 29EDD-34 Protection & Control (29EDD-34) test relay B-51G,P120, - 29PL6-38 - Block 7 Relay 450037252
3.46 Days
Continuous		  
18-Jun-25 08:00 20-Jun-25 18:00 ATCO TE ATCO RTU/SCADA update and test new RTAC configurations 2.42 Days
Continuous		  
18-Jun-25 08:00 20-Jun-25 17:00 ALTALINK Outage 786L (799s Coleman - BCH Natal) move fiber run to accommodate construction 2.38 Days
Continuous		 AB-BC
18-Jun-25 08:00 20-Jun-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 799s Coleman move fiber run 2.38 Days
Continuous		  
18-Jun-25 08:30 20-Jun-25 17:00 ALTALINK TE 698s Protection & Control (698s Jackfish) standard relay maintenance. 2.35 Days
Daily		  
18-Jun-25 14:00 26-Jun-25 13:00 BCH Outage 5L72 (BCH Mica G.S. - BCH Nicola) MCA 5CVT23 PM
7.96 Days
Continuous		  
19-Jun-25 07:00 20-Jun-25 18:00 ALTALINK, ENBRIDGE Outage 703L (213s Hughenden - 703BL tap), 213s 703 (213s Hughenden), 329s HRT-S2 (329s Hrt Express) replace arms and insulators on structure 39. replace structure 77. repair woodpecker damage on structure 78. 1.46 Days
Daily		  
19-Jun-25 08:00 20-Jun-25 19:00 ATCO Outage 845s 703 (845s Big Mountain) protection upgrade 21A & 21B relays 7L13.
CT testing, breaker testing		 1.46 Days
Continuous		  
19-Jun-25 08:00 20-Jun-25 19:00 ATCO Outage 808s 702T (808s Procter & Gamble), 808s 702 (808s Procter & Gamble) 7L13 relay replacement.
CT testing, breaker testing		 1.46 Days
Continuous		  
19-Jun-25 08:00 24-Jun-25 16:00 SUNCOR Outage 635EDD-1001 635PK-1003 (635EDD-1001), 635EDD-1001 635PS-1110 (635EDD-1001) 635EDD-1001 144kV diameter 3 equipment maintenance 5.33 Days
Continuous		  
20-Jun-25 07:30 22-Jun-25 17:30 ALTALINK RB 1201L (520s Bennett - BCH Cranbrook) barehand training crew will be replacing insulation and jumpers at STRs 2, 101 & 103 2.42 Days
Daily		  
20-Jun-25 08:00 20-Jun-25 16:00 ENMAX Outage 162B138-RB81 (SS-162) hv breaker maintenance - 162B138-RB81, breaker dashpot checks 8 Hours
Continuous		  
20-Jun-25 08:00 20-Jun-25 16:00 ENMAX Outage 13.60L (SS-13 - SS-27), 27.2TR (SS-27), 27B69-13.60 (SS-27), 13B69-13.60 (SS-13), 27MD69-27.2TR (SS-27), SW65 (SS-27) make repairs to damaged 27MD69-27.2TR 8 Hours
Continuous		  
21-Jun-25 08:00 21-Jun-25 18:00 ENMAX Outage 2.83L (SS-5 - 2.83L tap), 2.83L (SS-2 - 2.83L tap), 2.83L (SS-13 - 2.83L tap), 3.84L (SS-3 - SS-13), 13.1TR (SS-13), 13.3TR (SS-13), 13B138-2.83 (SS-13), 13B138-3.84 (SS-13), 5B138-2.83 (SS-5), 3B138-3.84 (SS-3), SW83 (SS-13), 13MD138-13.1TR (SS-13), 13MD138-13.3TR (SS-13), 2MD138-2.83 (SS-2) oil sampling - 13.3-TC, MT, summer substation washing 10 Hours
Continuous		  
21-Jun-25 08:00 08-Jul-25 16:00 Syncrude, ATCO Outage RL1 (848s Ruth Lake - D05), T2 (D05 Syncrude), D05 517 (D05), D05 516 (D05), D05 513 (D05), D05 78 (D05), D05 517B (D05), D05 516A (D05), D05 516B (D05), D05 513A (D05), D05 513B (D05), D05 509 (D05), D05 78A (D05), 848s RL-1D1 (848s Ruth Lake) 6-year 260 kV and 72 kV preventive maintenance 17.33 Days
Continuous		  
22-Jun-25 08:00 22-Jun-25 12:00 ENMAX Outage 21.4TR (SS-21), 21B69-21.4TR (SS-21) HV breaker SF6 gas sample - 21B69-21.4TR 4 Hours
Continuous		  
22-Jun-25 09:00 24-Jun-25 14:00 ENMAX Outage 31.2TR (SS-31) grounding improvements ,install new surge arrestor insulator supports, and grounding 2.21 Days
Continuous		  
22-Jun-25 12:00 22-Jun-25 16:00 ENMAX, ALTALINK Outage 28.80L (42s Sarcee - SS-28), 28B138-28.80 (SS-28), 42s 28 (42s Sarcee) HV breaker SF6 gas sample - 28B138-28.80 4 Hours
Continuous		  
22-Jun-25 12:00 22-Jun-25 16:00 ENMAX, ALTALINK IO 28.80L (42s Sarcee - SS-28) HV breaker SF6 gas sample - 28B138-28.80 4 Hours
Daily		  
23-Jun-25 07:00 27-Jun-25 17:00 EPCOR Outage 72CH9 (987s Clover Bar - EP Hardisty), 987s CH722 (987s Clover Bar), H724 (EP Hardisty) Cloverbar - CH9 zone doble and CH722 breaker maintenance and CDS3/HDS10 disconnect maintenance 4.42 Days
Continuous		  
23-Jun-25 07:00 26-Jun-25 17:00 EPCOR Outage 72RV4 (EP 511s Victoria - Rossdale), EP 511s V726 (EP 511s Victoria), EP 511s V727 (EP 511s Victoria), RV726 (Rossdale) Victoria: RV4 zone doble and disconnect maintenance 3.42 Days
Continuous		  
23-Jun-25 07:00 26-Jun-25 18:00 ALTALINK, VISIONREQ Outage 354s PMU (354s Summerview), 354s 138DS4 (354s Summerview) replace PMU device with new SEL PMU circuits 3.46 Days
Continuous		  
23-Jun-25 07:00 26-Jun-25 17:00 ALTALINK, VISIONREQ TE 354s PMU (354s Summerview) PMU outage for replacement 3.42 Days
Continuous		  
23-Jun-25 07:00 26-Jun-25 18:00 ALTALINK, VISIONREQ TE 354s RTU/SCADA (354s Summerview) setup of new PMU 3.46 Days
Daily		  
23-Jun-25 07:00 27-Jun-25 17:00 EPCOR Outage RR729 (Rossdale) Rossdale - RR729 breaker fail upgrade cutovers 4.42 Days
Continuous		  
23-Jun-25 07:00 27-Jun-25 17:30 ALTALINK TE 678s RTU/SCADA (678s Okotoks) download updated configuration, and complete points check, iInstall and commission new port server 4.44 Days
Daily		  
23-Jun-25 07:00 26-Jun-25 17:00 ALTALINK TE 227s RTU/SCADA (227s Cutting Lake) update the RTU configuration 3.42 Days
Daily		  
23-Jun-25 07:30 26-Jun-25 17:30 ALTALINK RB 799L (235s Entwistle - 443s South Mayerthorpe), 799L (77s Sagitawah - 443s South Mayerthorpe) proximity for 799L rebuild (str 731-830) 3.42 Days
Daily		  
23-Jun-25 07:30 26-Jun-25 17:30 ALTALINK RB 514L (396s Pincher Creek - 514BL tap), 514L (513s Lundbreck - 514BL tap) component replacement on 514L (str 16-186) and (str 452-453) - live line 3.42 Days
Daily		  
23-Jun-25 07:30 24-Jun-25 17:30 ALTALINK RB 688AL (284s Nose Creek - 688L tap), 688L (199s East Airdrie - 688BL tap), 688BL (1055s Sollair - 688L tap), 688L (653s Summit - 688AL tap), 688L (688AL tap - 688BL tap) barehand training at strs 18 and 19 - live line 1.42 Days
Daily		  
23-Jun-25 08:00 09-Jul-25 17:00 ATCO TE 808s Protection & Control (808s Procter & Gamble) relay replacement 16.38 Days
Continuous		  
23-Jun-25 08:00 09-Jul-25 17:00 ATCO TE 845s Protection & Control (845s Big Mountain), 845s RTU/SCADA (845s Big Mountain) relay replacement 16.38 Days
Continuous		  
23-Jun-25 08:00 27-Jun-25 17:00 ALTALINK TE 799s RTU/SCADA (799s Coleman) addition and testing of alarms/controls associated with new T3 and associated protection upgrade 4.38 Days
Daily		  
23-Jun-25 08:00 27-Jun-25 17:00 ALTALINK TE 799s Protection & Control (799s Coleman) circuit cutover and testing 4.38 Days
Daily		  
23-Jun-25 08:00 26-Jun-25 16:00 ATCO RB 7L43 (739s Edith Lake - 809s Louise Creek) walk up and climbing inspection 3.33 Days
Continuous		  
23-Jun-25 08:00 24-Jun-25 16:00 ENMAX Outage 16.63L (SS-16 - SS-36), 16B69-16.63 (SS-16), 36B69-16.63/36.5TR (SS-36) HV breaker maintenance - 16B69-16.63 1.33 Days
Continuous		  
23-Jun-25 08:00 24-Jun-25 17:00 ALTALINK TE 89s Protection & Control (89s Ellerslie) remove DC from 89s909W controls to facilitate repair of 89s1140 cable 1.38 Days
Daily		  
23-Jun-25 08:00 26-Jun-25 17:30 ALTALINK TE 678s Protection & Control (678s Okotoks) SCADA upgrade project 3.4 Days
Daily		  
23-Jun-25 08:00 24-Jun-25 18:00 ENMAX Outage 38.3TR (SS-38) tap changer inspection - 38.3-TC, tap changer oil filtration maintenance, oil sampling MT, TC 1.42 Days
Continuous		  
23-Jun-25 08:00 26-Jun-25 16:00 ATCO RB 7L39 (722s Crystal Lake - 7LA39 tap), 7L39 (811s Clairmont Lake - 7LA39 tap) walk up and climbing inspection 3.33 Days
Continuous		  
23-Jun-25 08:00 26-Jun-25 16:00 ATCO RB 7L08 (830s Carmon - 834s Wesley Creek) walk up and climbing inspection 3.33 Days
Continuous		  
23-Jun-25 09:00 30-Jun-25 18:00 SUNCOR TE 29EDD-34 RTU/SCADA (29EDD-34) upgrade network switch firmware and reboot network switch 7.38 Days
Continuous		  
23-Jun-25 09:00 30-Jun-25 18:00 SUNCOR TE 29EDD-1 RTU/SCADA (29EDD-1 Millennium) upgrade network switch firmware and reboot network switch 7.38 Days
Continuous		  
23-Jun-25 09:30 27-Jun-25 19:00 ATCO Outage 808s 702T (808s Procter & Gamble), 808s 702 (808s Procter & Gamble) 7L13 relay replacement,
CT testing, breaker testing		 4.4 Days
Continuous		  
23-Jun-25 09:30 27-Jun-25 17:30 ATCO Outage 757s 912T (757s Battle River), 757s 710 (757s Battle River), 757s 912 (757s Battle River), 755s 9L80D2 (755s Cordel) transformer class1 major testing - breaker testing - 710 at 757s 4.33 Days
Continuous		  
23-Jun-25 10:00 24-Jun-25 15:00 ATCO Outage 844s 701T (844s AEC Mill), 844s 701 (844s AEC Mill) oil samples and work to within LOA 29 Hours
Continuous		  
23-Jun-25 10:00 27-Jun-25 17:30 ATCO Outage 7L128 (963s Coyote Lake - 7LA128 tap), 9L29 (946s Oakland - 963s Coyote Lake), 963s 901T (963s Coyote Lake), 963s 901 (963s Coyote Lake), 963s 701 (963s Coyote Lake), 963s 7L128D4 (963s Coyote Lake), 963s 9L29D1 (963s Coyote Lake), 946s 9L29D2 (946s Oakland) transformer testing - 901T at 963s, qualitrol ITM/ETM settings updates 4.31 Days
Continuous		  
23-Jun-25 10:00 27-Jun-25 17:30 ATCO TE 963s RTU/SCADA (963s Coyote Lake) settings updates
4.31 Days
Continuous		  
23-Jun-25 11:00 26-Jun-25 16:00 ATCO, ALTALINK RB 9L960 (13s Deerland - 825s Whitefish Lake) climbing inspection on 9L960 and 9L961 3.21 Days
Continuous		  
23-Jun-25 11:00 26-Jun-25 16:00 ATCO, ALTALINK RB 9L961 (13s Deerland - 825s Whitefish Lake) climbing inspection 3.21 Days
Continuous		  
23-Jun-25 11:00 23-Jun-25 17:00 ALTALINK TE 385s RTU/SCADA (385s Spring Coulee) UF settings removal from 112L & SCADA changes associated with removal 6 Hours
Daily		  
23-Jun-25 11:00 26-Jun-25 16:00 ATCO, ALTALINK RB 9L960 (13s Deerland - 825s Whitefish Lake) climbing inspection 3.21 Days
Daily		  
23-Jun-25 11:00 26-Jun-25 16:00 ATCO, ALTALINK RB 9L961 (13s Deerland - 825s Whitefish Lake) climbing inspection 3.21 Days
Daily		  
23-Jun-25 11:30 26-Jun-25 18:30 ALTALINK Outage 1140L (89s Ellerslie - 289s Saunders Lake), 89s 952 (89s Ellerslie), 89s 1052 (89s Ellerslie) breaker maintenance 3.29 Days
Continuous		  
23-Jun-25 11:30 26-Jun-25 18:30 ALTALINK Outage 89s T1 (89s Ellerslie) doble and maintenance 3.29 Days
Continuous		  
23-Jun-25 12:00 04-Jul-25 16:00 ATCO Outage 826s 901T (826s Marguerite Lake), 826s 502R (826s Marguerite Lake) transformer major maintenance 11.17 Days
Continuous		  
23-Jun-25 12:00 24-Jun-25 17:00 ATCO Outage 848s 402R (848s Ruth Lake), 848s 403R (848s Ruth Lake), 848s 404R (848s Ruth Lake), 848s 402 (848s Ruth Lake) PRC-005 - trip coil testing, breaker 402 at 848s 29 Hours
Continuous		  
23-Jun-25 13:30 23-Jun-25 17:00 ALTALINK TE 385s Protection & Control (385s Spring Coulee) settings changes 3.5 Hours
Daily		  
23-Jun-25 19:00 23-Jun-25 23:59 BCH Outage 5L92 (BCH Cranbrook - BCH Selkirk), 5D44 (BCH Cranbrook) investigate suspect faulty interrupter on 5D44 4.98 Hours
Continuous		 AB-BC
24-Jun-25 07:00 25-Jun-25 15:00 ALTALINK TE AltaLink Telecom Equipment, 121s RTU/SCADA (121s Brooks) upgrade to our firewall at 121s 1.33 Days
Daily		  
24-Jun-25 07:00 24-Jun-25 17:00 ALTALINK TE 477s RTU/SCADA (477s Amoco West Pembina) board removal 10 Hours
Daily		  
24-Jun-25 08:00 25-Jun-25 16:00 ENMAX IO Protection & Control (SS-37) 37sub capacity upgrade 1.33 Days
Continuous		  
24-Jun-25 08:00 26-Jun-25 18:00 ALTALINK Outage 891L (226s Garden City - 863L tap) SAB-1 maintenance. 2.42 Days
Continuous		  
24-Jun-25 08:00 24-Jun-25 17:00 ALTALINK TE AltaLink Telecom Equipment investigate MPLS issue 9 Hours
Daily		  
24-Jun-25 08:00 25-Jun-25 17:00 ALTALINK Outage 510s 2552 (510s Sunnybrook) replace grading caps 1.38 Days
Continuous		  
24-Jun-25 08:00 25-Jun-25 17:00 ALTALINK TE AltaLink Telecom Equipment install new IRU600V4 to salvage existing IRU600 1.38 Days
Daily		  
24-Jun-25 08:00 24-Jun-25 17:00 ALTALINK TE 602s RTU/SCADA (602s Cold Creek) 2025 MPLS firmware and raw socket upgrade 9 Hours
Daily		  
24-Jun-25 08:00 25-Jun-25 17:00 ALTALINK TE 276s Protection & Control (276s Union Carbide Prentiss), AltaLink Telecom Equipment perform an MPLS node addition upgrade 1.38 Days
Daily		  
24-Jun-25 08:00 25-Jun-25 16:00 ENMAX Outage 37.3TR (SS-37) forward energize 37.3TR for 24 hour soak test 1.33 Days
Continuous		  
24-Jun-25 08:00 26-Jun-25 18:00 EHN, ALTALINK, ENBRIDGE Outage 226s Garden City, 891L (226s Garden City - 863L tap), 226s T1 (226s Garden City), 226s 52/T1 (226s Garden City) station maintenance 2.42 Days
Continuous		  
24-Jun-25 08:30 25-Jun-25 16:00 ATCO Outage ATC 793s 701T (ATC 793s West Peace River) testing and maintenance. 31.5 Hours
Continuous		  
24-Jun-25 08:30 24-Jun-25 14:30 ALTALINK Outage 127s C1 (127s Bruderheim) 138 kV breaker maintenance 6 Hours
Daily		  
24-Jun-25 08:30 24-Jun-25 16:30 ALTALINK Outage 356s 152 (356s Milo) 356s152 PRC5, maintenance 8 Hours
Daily		  
24-Jun-25 08:30 24-Jun-25 12:00 ATCO RB ATC 793s 144kV Bus (ATC 793s West Peace River) cut in jumper J1 for 701TCS at 793s 3.5 Hours
Continuous		  
24-Jun-25 09:00 24-Jun-25 15:00 ALTALINK Outage 863L (618s Riverbend - 891L tap), 618s 863X (618s Riverbend) insulator replacement 6 Hours
Daily		  
24-Jun-25 09:00 24-Jun-25 17:00 ATCO TE ATCO Telecom Equipment, 856s RTU/SCADA (856s Kinosis) Kinosis_S-Telecom- low bes firewall install 8 Hours
Continuous		  
24-Jun-25 10:00 24-Jun-25 16:00 ATCO TE 882s RTU/SCADA (882s Triangle), ATCO Telecom Equipment replace the flash card or CSM card on the SAR slot, B
SAR OS upgrade required and SAR reboot 		6 Hours
Continuous		  
24-Jun-25 15:30 25-Jun-25 16:30 ATCO Outage 844s 702T (844s AEC Mill), 844s 402 (844s AEC Mill) oil samples and work to within LOA 25 Hours
Continuous		  
25-Jun-25 07:00 25-Jun-25 16:00 ALTALINK Outage 413L (239s Castle River - 632s Russell), 632s 413 (632s Russell) maintenance 9 Hours
Daily		  
25-Jun-25 07:00 25-Jun-25 17:00 ALTALINK TE 227s Protection & Control (227s Cutting Lake) update relay IP address in line with SCADA work 10 Hours
Daily		  
25-Jun-25 07:00 26-Jun-25 18:00 ALTALINK Outage 973L (39s Bickerdike - 310p Sundance) Repair broken strands on the 973L conductor between spans 24-25. 1.46 Days
Continuous		  
25-Jun-25 07:00 26-Jun-25 18:00 ALTALINK RB 974L (39s Bickerdike - 310p Sundance) urgent - proximity for 973L conductor repair 1.46 Days
Daily		  
25-Jun-25 07:30 25-Jun-25 17:30 ALTALINK RB 1201L (520s Bennett - BCH Cranbrook) replacing insulation at STR 2 10 Hours
Daily		  
25-Jun-25 08:00 03-Jul-25 20:00 SUNCOR Outage 29PL6-4 (29EDD-1 Millennium - 30EDD-1), 29EDD-1 29EDD1s1552 (29EDD-1 Millennium), 29EDD-1 29EDD1s1652 (29EDD-1 Millennium), 30EDD-1 622 (30EDD-1), 30EDD-1 623 (30EDD-1), 29EDD-1 29EDD1SPL6-4 (29EDD-1 Millennium), 30EDD-1 29PL6-4D1 (30EDD-1) 29CVT-8 system PM, 29PL6-4 A87L GE L90 firmware, 29PL6-4 bird cover on line switch and 30EDD-01 29PS6-4D1 replacement 8.5 Days
Continuous		  
25-Jun-25 08:00 25-Jun-25 16:00 ALTALINK Outage 864L (397s Benbow - 864AL tap), 864L (864AL tap - 864BL tap), 864L (551s Chevron Kaybob - 864BL tap), 864AL (346s Kaybob - 864L tap), 864BL (355s Chevron Knight - 864L tap), 346s T1 (346s Kaybob), 355s T1 (355s Chevron Knight), 355s T2 (355s Chevron Knight), 551s T1 (551s Chevron Kaybob), 355s 2 (355s Chevron Knight), 355s 4 (355s Chevron Knight), 551s 864N (551s Chevron Kaybob), 346s 864AN (346s Kaybob) close open point 'B' on 346s 4.16kV bus 8 Hours
Daily		  
25-Jun-25 08:00 25-Jun-25 17:00 ALTALINK TE 492s RTU/SCADA (492s Monarch), AltaLink Telecom Equipment 492s Monarch supervisory outage 9 Hours
Daily		  
25-Jun-25 08:00 26-Jun-25 18:00 ENMAX Outage 36.2TR (SS-36) tap changer inspection, reversing switch check, oil sampling MT, TC and tap changer oil filtration maintenance 1.42 Days
Continuous		  
25-Jun-25 08:00 26-Jun-25 17:00 ALTALINK TE 348s RTU/SCADA (348s Marlboro) 2025 MPLS firmware and chassis upgrade at 348s 1.38 Days
Daily		  
25-Jun-25 08:00 25-Jun-25 17:00 ALTALINK TE 15s RTU/SCADA (15s Fort Macleod) remove UF settings from 14L & 41L 9 Hours
Daily		  
25-Jun-25 08:00 26-Jun-25 16:00 ATCO RB 9L36 (825s Whitefish Lake - 826s Marguerite Lake) repair damaged tower 46 1.33 Days
Continuous		  
25-Jun-25 08:00 26-Jun-25 16:00 ATCO RB 9L37 (825s Whitefish Lake - 826s Marguerite Lake) repair damaged tower 46 1.33 Days
Continuous		  
25-Jun-25 08:00 25-Jun-25 16:00 ENMAX Outage 16.60L (SS-16 - SS-34), 16B69-16.60 (SS-16) breaker maintenance and oil sampling 8 Hours
Continuous		  
25-Jun-25 08:00 25-Jun-25 17:00 ALTALINK TE AltaLink Telecom Equipment upgrade MPLS and LAN switch replacement 9 Hours
Daily		  
25-Jun-25 08:30 25-Jun-25 16:30 ALTALINK Outage 356s 552 (356s Milo) 356s552 PRC5 maintenance and counter replacement 8 Hours
Daily		  
25-Jun-25 08:30 25-Jun-25 16:30 ALTALINK, TRANSALTA Outage 59s T1 (59s Peigan), 59s 138kV Bus (59s Peigan), 616L (59s Peigan - 616AL tap), 59s 616 (59s Peigan) 59s T1 LA replacement 138kV 8 Hours
Daily		  
25-Jun-25 08:30 25-Jun-25 17:00 ALTALINK TE 526s Protection & Control (526s Buffalo Creek) investigate C1 string alarm and potentially replace protection 8.5 Hours
Daily		  
25-Jun-25 09:00 26-Jun-25 14:00 ENMAX Outage 31.3TR (SS-31) grounding improvements and install new surge arrestor insulator supports 29 Hours
Continuous		  
25-Jun-25 09:00 25-Jun-25 18:00 SUNCOR TE 29EDD-34 RTU/SCADA (29EDD-34) RTU power cycle and reboot 9 Hours
Continuous		  
25-Jun-25 10:00 25-Jun-25 17:00 ATCO, CNRL TE 838s RTU/SCADA (838s Horizon Mining) update SMP gateway 7 Hours
Continuous		  
25-Jun-25 10:00 25-Jun-25 12:00 Lethbridge TE Lethbridge PCC replacing RX 1500 network switch at PCC 2 Hours
Continuous		  
25-Jun-25 10:00 26-Jun-25 17:00 ATCO TE 716s Protection & Control (716s Lloydminster), 716s RTU/SCADA (716s Lloydminster) replace the AC cable for 701T cabinet with a larger size conductor 31 Hours
Continuous		  
25-Jun-25 14:00 25-Jun-25 18:00 ATCO RB ATC 793s 144kV Bus (ATC 793s West Peace River) reattach jumper for 701TCS and open jumper for 702TCS 4 Hours
Continuous		  
25-Jun-25 16:15 27-Jun-25 16:00 ATCO Outage ATC 793s 702T (ATC 793s West Peace River) complete CCT SW S&C test and maintenance 702TCS 1.99 Days
Continuous		  
26-Jun-25 07:30 26-Jun-25 12:30 ALTALINK Outage 700L (422s Westwood - 746L tap), 700L (746s Sherwood Park - 746L tap), 746L (700L tap - 746AL tap), 422s 700 (422s Westwood), 746s 700N (746s Sherwood Park) replacing insulator on structure 52 5 Hours
Daily		  
26-Jun-25 08:00 01-Jul-25 16:00 SUNCOR Outage 635EDD-1001 635PK-1002 (635EDD-1001), 635EDD-1001 635-752-642 (635EDD-1001), 635EDD-1001 635-752-643 (635EDD-1001) 635EDD-1001 144 kV diameter 4 equipment maintenance 5.33 Days
Continuous		  
26-Jun-25 08:00 26-Jun-25 18:00 ATCO TE 927s RTU/SCADA (927s Buchanan Creek), ATCO Telecom Equipment Deadwood_T-Telecom- telecom DC systems outage, load transfer from Hayley charger to unity rectifier
 10 Hours
Continuous		  
26-Jun-25 08:00 26-Jun-25 17:00 ALTALINK TE 288s RTU/SCADA (288s Wolf Creek) replace failing SMP16 RTU 9 Hours
Daily		  
26-Jun-25 08:00 26-Jun-25 17:00 ALTALINK TE 534s RTU/SCADA (534s Eckville), 17s RTU/SCADA (17s Benalto), AltaLink PMU, 17s Protection & Control (17s Benalto) upgrade MPLS 9 Hours
Daily		  
26-Jun-25 08:30 26-Jun-25 16:30 ALTALINK Outage 356s 652 (356s Milo) 356s652 PRC5 maintenance, gas top up 8 Hours
Daily		  
26-Jun-25 09:00 26-Jun-25 17:00 ATCO TE 764s RTU/SCADA (764s Heisler) Heisler_S-Telecom - low BES firewall install - outage to local network & SCADA communications 8 Hours
Continuous		  
26-Jun-25 12:31 26-Jun-25 17:30 ALTALINK Outage 706L (410s Josephburg - 706AL tap) replacing insulator on structure 4.98 Hours
Daily		  
27-Jun-25 08:00 27-Jun-25 12:00 ENMAX Outage 26.81L (SS-26 - SS-32), 32B138-26.81 (SS-32), 26B138-26.81 (SS-26) breaker SF6 gas sample for 32B138-26.81 4 Hours
Continuous		  
27-Jun-25 12:00 27-Jun-25 18:00 ALTALINK Outage 726L (37s North Calder - 71s Lamoureux), 37s 726E (37s North Calder) replacing insulator on structure 197 6 Hours
Daily		  
27-Jun-25 12:00 27-Jun-25 16:00 ENMAX Outage 32.83L (SS-32 - SS-40), 32B138-32.83 (SS-32), 40B138-32.83 (SS-40) breaker SF6 gas sample for 32B138-32.83 4 Hours
Continuous		  
27-Jun-25 13:00 27-Jun-25 17:00 ATCO RB ATC 793s 144kV Bus (ATC 793s West Peace River) re-attach jumper for 702TCS at 793s
 4 Hours
Continuous		  

Prepared On:   2025-06-19   15:41:41

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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