Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2017-05-27

The table below contains the significant transmission outages submitted as tentative to the AESO.
These Outages have not yet necessarily been approved, but are listed for awareness and coordination purposes.
An Outage has been considered significant for this table if it meets any one (1) or more of the following criteria:
  1. it affects a transmission facility operating at two hundred and forty (240) kV or greater;
  2. it affects an intertie;
  3. it affects an element connecting facilities owned by two (2) or more different legal owners of transmission facilities;
  4. it affects an element that connects a generating unit or an aggregated generating facility to the interconnected electric system;
  5. it requires the ISO to issue a dispatch or directive for generation in order to facilitate the planned outage;
  6. it affects a cutplane limit;
  7. it limits or reduces the operability of a synchronous condenser, static VAr compensator, static compensator or other similar dynamic device; or
  8. it affects high voltage direct current facilities.
Note: Where a transmission outage requires generation curtailments, the adjustments to generation will typically happen in the hours before the scheduled transmission outage and in the hour after the element is returned to service.

Previous Version
Download CSV

Owner From To Duration Element Scheduled Activity Affected Intertie
ATCO 16-Mar-17 16:00 16-Jul-17 16:00 122 Days
Continuous
959S SVC (959s Lanfine) forced outage  
ALTALINK 21-May-17 07:30 27-May-17 18:30 6.46 Days
Continuous
1106L (ENMAX 65 - 237s Foothills) damper replacements  
Syncrude 22-May-17 06:00 03-Jun-17 21:00 12.63 Days
Continuous
AL-1 (D05 Syncrude - Aurora) tie-Ins for various infrastructure system  
EPCOR 23-May-17 07:00 02-Jul-17 17:00 40.42 Days
Continuous
814s T2 (814s Bellamy),RossdaleT1 (Rossdale) retrofit rossdale TX  
ALTALINK 24-May-17 07:00 29-May-17 05:00 4.92 Days
Continuous
250p22 (250p Bighorn) spring test  
ALTALINK 24-May-17 07:30 31-May-17 17:30 7.42 Days
Continuous
1054L (13s Deerland - 12s Heartland) damper replacements  
BCH 26-May-17 20:00 27-May-17 06:00 10 Hours
Continuous
2L113 (B1s Natal - B2s Cranbrook) deadend insulator replacements AB-BC
ALTALINK 27-May-17 08:30 27-May-17 12:30 4 Hours
Daily
132s 240kV Bus2,1053L - GOI Damper Replacements (crossing over bus work)  
EPCOR 29-May-17 07:00 29-May-17 17:00 10 Hours
Continuous
TX1 @ Dome TX repair  
ALTALINK 29-May-17 07:00 30-May-17 17:00 1.42 Days
Continuous
42s T2 and 138kV South Bus - GOI Installing pollution monitors  
EPCOR 29-May-17 07:00 02-Jun-17 17:00 4.42 Days
Continuous
TX1 @ Petrolia Doble  
ATCO 29-May-17 07:00 09-Jun-17 07:30 11.02 Days
Continuous
13L50L2,2029S 13L50ND5 Pole 2 Outage: Water Line Repair @ 2029s Heathfield

Excavate waterline and repair if needed. Other maintenance to occur with time availability.

EATL will not be able to operate in Parallel Return. EATL will have to operate in DMR Return.

Pole 2 will be unavailable. Pole 1 and the DMR will be used.
 
ALTALINK 29-May-17 07:30 30-May-17 18:30 1.46 Days
Continuous
966L (650s - A932s) - GOI Damper Replacements  
ENMAX 29-May-17 08:00 09-Jun-17 16:00 11.33 Days
Continuous
24.83L. 24s & 74s 138KV Bus Differential Protection Line Protection Upgrade on 24.83L  
ALTALINK, Lethbridge 29-May-17 08:00 14-Aug-17 15:00 77.29 Days
Continuous
734L (241s Lethbridge Uplands - 370s North Lethbridge) contractor digging under 138kv line  
BCH 29-May-17 09:00 09-Jun-17 17:00 11.33 Days
Continuous
2L113 (B1s Natal - B2s Cranbrook) CBK 2CVT3 replacement and replace defective insulators AB-BC
ALTALINK 29-May-17 11:00 29-May-17 17:00 6 Hours
Daily
102s6652 GOI Urgent: Breaker does not operate properly, need to replace auxiliary contacts.  
ALTALINK 29-May-17 11:00 01-Jun-17 17:00 3.25 Days
Continuous
1036L (356s - 554s) - GOI SCADA Equipment Upgrade  
ALTALINK 30-May-17 10:00 30-May-17 12:00 2 Hours
Daily
1086L (852s - 898s) De-energize MPLS upgrade to 1085L & 1086L TPR circuits. All TPR circuits at the same time. Open breakers at both ends on 1086L  
SUNCOR 01-Jun-17 08:00 03-Jun-17 17:00 2.38 Days
Continuous
635PT-1000,635PL9-1000 (2005s Secord - 635EDD-1000) Fort Hills IMS and LoadShed System Field Equipment Tie-in and Testing
ABB Relays Card Change
 
EPCOR 02-Jun-17 07:00 02-Jun-17 17:00 10 Hours
Continuous
TX1 CVT @ Petrolia Doble  
ALTALINK 02-Jun-17 08:30 02-Jun-17 14:00 5.5 Hours
Daily
268s199N (affects 199L) Advice Complete full trip tests from T1 A & B protection as well as 138 kV Bus protection. Redundant protections one at a time.  
SUNCOR 04-Jun-17 08:00 06-Jun-17 17:00 2.38 Days
Continuous
635PL9-1001 (2005s Secord - 635EDD-1001),635PT-1001 Fort Hills IMS and LoadShed System Field Equipment Tie-in and Testing
ABB Relays Card Change
 
EPCOR 05-Jun-17 07:00 05-Jun-17 17:00 10 Hours
Continuous
TX1 @ Dome Bushing Replacement  
EPCOR 05-Jun-17 07:00 06-Jun-17 17:00 1.42 Days
Continuous
P2401 @ Petrolia Doble  
ATCO 05-Jun-17 07:00 16-Jun-17 07:00 11 Days
Continuous
2075S ACF2 Maintenance  
ATCO 05-Jun-17 07:00 16-Jun-17 12:00 11.21 Days
Continuous
2075S BUILDING VALVE HALL 13L50 is being taken out of service to repair the voltage divider as per the Trench design flaw. During the outage the line will be unavailable.  
ATCO 05-Jun-17 07:00 16-Jun-17 12:00 11.21 Days
Continuous
2029S BUILDING VALVE HALL Valve hall out of service to repair 1300PT1 divider @ 2029s Heathfield from previous outage. perform maintenance tasks and inspections as per Siemens recommendations.  
ALTALINK 05-Jun-17 08:00 05-Jun-17 17:00 9 Hours
Daily
33s6 (33s Spray) maintenance  
ALTALINK 05-Jun-17 09:30 05-Jun-17 17:00 7.5 Hours
Daily
275s T2,25kV Bus 2 and 275s312X - GOI Installing temporary 25kV cable  
ALTALINK 05-Jun-17 11:00 08-Jun-17 17:00 3.25 Days
Continuous
923L/9L923 (356s - A2075s) - GOI SCADA Equipment Upgrade  
ALTALINK 05-Jun-17 11:30 06-Jun-17 17:30 30 Hours
Continuous
338s252 GOI Breaker maintenance  
ATCO 05-Jun-17 12:00 08-Jun-17 16:00 3.17 Days
Continuous
2075S 240kv Bus 240KV BUS PORTION OOS FOR CORONA INSPECTION AND REPAIRS, 9L923 and HVDC converter will already be OOS  
ATCO 05-Jun-17 12:00 13-Jun-17 12:00 8 Days
Continuous
2029S 1200BS1,2029S 1200SST1 Maintenance activities include bus bar clamp inspections, gang switch inspections, 1200SST1 inspection and RCVT maintenance testing.
EATL will be OOS during this time.
SST2 will provide station supply with generator as redundant backup
12L70 still in service which will feed 1200BS2
 
ATCO 05-Jun-17 12:00 16-Jun-17 12:00 11 Days
Continuous
2029S ACF1 inspections and maintenance as per manufacturer recommendations, ACF1 will already be OOS for 13L50/Convertor OOS @ 2029s  
ATCO 05-Jun-17 12:00 17-Jun-17 12:00 12 Days
Continuous
2029S ACF2,12L85 performing maintenance and inspections on 12L85 disconnect and ACF2 Filters @ 2029s Heathfield, Convertor station will already be OOS, 12L70 will remain in service  
ATCO 06-Jun-17 07:00 06-Jun-17 17:00 10 Hours
Continuous
2075S 900BS1 900BS1 (BUSN-1) INSPECTION & CORONA REPAIRS @ 2075S NEWELL, one side 240kV breaker and a half scheme will be open, all lines and filter banks radial tied to 900BS2, Convertor stn will already be OOS

While the Bus is in service the AC yard will be running on a single bus for all four lines coming into the station.
this will not limit any power flow to 13L50 in any way. Plan to restore the bus before the end of the shift, so that ALTALINK and ATCO do not have to worry about running the lines on one buss overnight.
 
ALTALINK 06-Jun-17 12:00 06-Jun-17 18:00 6 Hours
Daily
854L (39s-854L228A),138kV Bus 1,39s T1 Insulator replacement  
EPCOR 07-Jun-17 07:00 08-Jun-17 17:00 1.42 Days
Continuous
P2402 @ Petrolia Doble  
ENMAX 07-Jun-17 08:00 07-Jun-17 16:00 8 Hours
Continuous
162B240-RB134 SF6 Gas Sample. Resample all three phases  
ALTALINK 07-Jun-17 08:30 08-Jun-17 17:30 1.38 Days
Continuous
338s T1 GOI Transformer maintenance  
ALTALINK 07-Jun-17 08:30 09-Jun-17 12:00 2.15 Days
Continuous
71s952 (C1) - GOI Replace CT Cabling Between 71s952 JB and the Building  
ATCO 07-Jun-17 09:00 08-Jun-17 15:00 30 Hours
Continuous
7L199 7L199 relocate poles 30 36
SIGNIFICANT OUTAGE
THIS WORK IS BEING DRIVEN BY ALBERTA TRANSPORTATION TIMELINES

move two structures for road move
 
ALTALINK 07-Jun-17 23:00 08-Jun-17 03:00 4 Hours
Daily
62s11 (62s Brazeau) maintenance  
ALTALINK 08-Jun-17 03:01 08-Jun-17 07:00 3.98 Hours
Daily
62s12 (62s Brazeau) maintenance  
ENMAX 08-Jun-17 08:00 08-Jun-17 16:00 8 Hours
Continuous
24.83L. 24B138-24.83 Doble breaker  
EPCOR 09-Jun-17 07:00 09-Jun-17 17:00 10 Hours
Continuous
1043L CVT @ Petrolia - Doble  
EPCOR 09-Jun-17 07:00 21-Jun-17 17:00 12.42 Days
Continuous
1055L ( Argyll - Petrolia ) Steel Pole Refurbishment  
ALTALINK 12-Jun-17 06:30 15-Jun-17 17:30 3.46 Days
Continuous
RATD 63s (929L) Breaker Bay GOI Change in scope to 63s2652 & 63s2752 bkr control wiring only - QQ towers to be installed at a later date  
EPCOR 12-Jun-17 07:00 13-Jun-17 17:00 1.42 Days
Continuous
P2403 BKR @ Petrolia Doble  
EPCOR 12-Jun-17 07:00 16-Jun-17 17:00 4.42 Days
Continuous
TX4 @ Jasper CVT replacements  
ATCO 12-Jun-17 07:00 09-Jul-17 17:00 27.42 Days
Continuous
801S 901T,801S 900 BUS 1 901T and 240kV bus # 1 OOS for Construction - Protection upgrade, 7L85 will be open ended @ 801s and radial feeding 25kV load, Breaker and a third bus configuration at 801s will be open at one end, 801s AC stn service on alternate supply.  
ATCO 12-Jun-17 09:00 16-Jun-17 17:00 4.33 Days
Continuous
848S 901T 901T Major testing and Maintenance at 848S Ruth Lake  
ALTALINK 12-Jun-17 11:00 15-Jun-17 17:00 3.25 Days
Continuous
927L (356s - 102s) - GOI SCADA Equipment Upgrade  
MONTANA 13-Jun-17 07:30 13-Jun-17 16:00 8.5 Hours
Daily
MATL (120s Picture Butte - Montana) MATL Maintenance:Repair O/H saddles AB-MATL
ALTALINK 13-Jun-17 08:00 13-Jun-17 17:30 9.5 Hours
Daily
108s T1 GOI Transformer maintenance - temperature monitor  
ATCO 14-Jun-17 08:00 14-Jun-17 16:30 8.5 Hours
Continuous
7L27 (834s Wesley Creek - A793s West Peace River),793S 705 793S 705 BREAKER SF6 HGF PARTIAL TESTING

7L27 Open ended for the duration of the work
 
ALTALINK 14-Jun-17 09:00 15-Jun-17 16:00 31 Hours
Continuous
74s104 GOI Breaker maintennace  
ATCO 14-Jun-17 10:00 15-Jun-17 12:00 26 Hours
Continuous
809S 912 BREAKER MIN OIL HLR PARTIAL, 912 @ 809S...Master

Perform Minor Maintenance, Breaker 912

240 KV ring will be open for duration
 
ATCO 14-Jun-17 12:30 15-Jun-17 15:00 26.5 Hours
Continuous
809S 906 BREAKER MIN OIL HPF PARTIAL, 906 @ 809S

Perform Partial Maint on 906 Breaker

240 KV ring will be open
 
EPCOR 16-Jun-17 07:00 16-Jun-17 17:00 10 Hours
Continuous
TX1 @ Castledowns Maint  
CENOVUS, ATCO 16-Jun-17 07:00 22-Jun-17 17:00 6.42 Days
Continuous
1200S Foster Creek Station,7L86 (822s Wolf Lake - 877s Foster Creek) breaker maintenance  
ATCO 16-Jun-17 07:00 22-Jun-17 17:00 6.42 Days
Continuous
7L574,822S 703,822S 702,7L86,Wolf Lake Install new 700PT2 bus PTs and secondary disconnects for split bus configuration, Cenovus Foster Ck will be islanded, 7L86 is to be de-energized/open at both ends, 7L35 Primrose will be radial fed from 970s via 7L574, CNRL and Cenovus RAS will be turned off @ 822s to prevent inadvertent trips  
ALTALINK 17-Jun-17 07:00 08-Jul-17 17:00 21.42 Days
Continuous
928L (17s-42s) GOI [SWCRR] SWCRR Line relocate: Set structures and string  
ALTALINK 17-Jun-17 07:00 08-Jul-17 17:00 21.42 Days
Continuous
906L (17s-42s) GOI [SWCRR] SWCRR String new alignment  
ATCO 19-Jun-17 07:00 19-Jun-17 17:00 10 Hours
Continuous
7L68 7L68 OOS for Protection upgrade and install new TPR and RAS.  
EPCOR 19-Jun-17 07:00 20-Jun-17 17:00 1.42 Days
Continuous
P2405 BKR @ Petrolia Doble  
EPCOR 19-Jun-17 07:00 23-Jun-17 17:00 4.42 Days
Continuous
TX1 @ East industrial Doble  
ATCO 19-Jun-17 08:00 23-Jun-17 17:00 4.38 Days
Continuous
848S 902T transformer maint, all load transferred to 901T  
ALTALINK 19-Jun-17 09:30 21-Jun-17 12:30 2.13 Days
Continuous
510s ACF12 GOI Replace failed capacitors. Will not affect dispatch capability of HVDC link.  
ALTALINK 19-Jun-17 11:00 20-Jun-17 17:00 30 Hours
Continuous
74s103 GOI Breaker maintennace  
ALTALINK 19-Jun-17 11:00 22-Jun-17 17:00 3.25 Days
Continuous
1005L (356s - 120s) - GOI SCADA Equipment Upgrade  
EPCOR 21-Jun-17 07:00 23-Jun-17 17:00 2.42 Days
Continuous
TX2 @ Petrolia Maint  
ALTALINK 21-Jun-17 12:30 23-Jun-17 17:30 2.21 Days
Continuous
510s ACF21 GOI Replace failed capacitors. Will not affect dispatch capability of HVDC link.  
EPCOR 22-Jun-17 07:00 06-Jul-17 17:00 14.42 Days
Continuous
1056L ( Argyll - Bellamy ) Steel Pole Refurbishment  
EPCOR 26-Jun-17 07:00 26-Jun-17 17:00 10 Hours
Continuous
TX2 @ Cloverbar Maint  
EPCOR 26-Jun-17 07:00 30-Jun-17 17:00 4.42 Days
Continuous
P2404 BKR @ Petrolia Maint  
EPCOR 26-Jun-17 07:00 30-Jun-17 17:00 4.42 Days
Continuous
P2406 @ Petrolia CT replacements  
EPCOR 26-Jun-17 07:00 30-Jun-17 17:00 4.42 Days
Continuous
TX2 @ Poundmaker Doble  
ATCO 26-Jun-17 07:00 25-Jul-17 17:00 29.42 Days
Continuous
822S 701T,822S 701,7L587,822S 700PT Replace 701TCS @ 822s, sub will be offloaded and station service backfed.from 721s, Jun 26-Jul 5 Cenovus and Primrose will be radial connected to 970s Bourque via 7L86, 144kV bus @ 822s, and 5L574. 7L587 will be open ended @ 822s. Once new 704A installed, GOI to be shrunk down to 704A and 501TD on Jul 5 and 7L587 & 144kV bus @ 822s returned to service. 701T will remain OOS until Jul 25.  
BCH 26-Jun-17 09:00 07-Jul-17 17:00 11.33 Days
Continuous
2L294 (Nelway - A.A. Lambert) BCH- replace end-of-life insulators and install arcing horns - BC maintenance does not affect AB ATC AB-BC
ALTALINK 26-Jun-17 09:30 28-Jun-17 17:00 2.31 Days
Continuous
510s ACF22 GOI Replace failed capacitors. Will not affect dispatch capability of HVDC link.  
ATCO 26-Jun-17 10:00 28-Jun-17 12:00 2.08 Days
Continuous
732S 904 BREAKER MIN OIL HPF COMPLETE TESTING, 240KV ring bus opened during duration of work  
ALTALINK 26-Jun-17 13:00 29-Jun-17 15:00 3.08 Days
Continuous
650s T3 & SVC - GOI SVC mtce  
EPCOR 27-Jun-17 07:00 27-Jun-17 17:00 10 Hours
Continuous
TX3 @ Cloverbar Maint  
ALTALINK 27-Jun-17 07:30 27-Jun-17 17:30 10 Hours
Daily
913L (69s - A732s) - GOI Emergency Repair on Str 142F  
ALTALINK 27-Jun-17 14:45 27-Jun-17 16:00 75 Mins
Daily
RATD 214s2047W advice Functional testing of new protection trips  
EPCOR 28-Jun-17 07:00 28-Jun-17 17:00 10 Hours
Continuous
TX4 @ Cloverbar Maint  
ATCO 28-Jun-17 12:30 30-Jun-17 13:00 2.02 Days
Continuous
732S 901 Partial PM on Bkr 901, 240kV ring will be open  
ALTALINK 28-Jun-17 16:30 30-Jun-17 18:00 2.06 Days
Continuous
240kV Bus 2 and 275s312X - GOI,275s T2 Removing temporary 25kV cable; 240kV Protection testing and final bus installation at 275s47 and 275s2252; Also, cutting over 240kV trip ccts. to new 25kV breaker  
EPCOR 29-Jun-17 07:00 29-Jun-17 17:00 10 Hours
Continuous
CGB3 @ Cloverbar Maint  
EPCOR 30-Jun-17 07:00 30-Jun-17 17:00 10 Hours
Continuous
CGB2 @ Cloverbar Maint  
EPCOR 30-Jun-17 07:00 30-Jun-17 17:00 10 Hours
Continuous
Bus 3 CVT @ Poundmaker Doble  
EPCOR 03-Jul-17 07:00 03-Jul-17 17:00 10 Hours
Continuous
1045L @ Jasper - Sundance Doble  
EPCOR 03-Jul-17 07:00 07-Jul-17 17:00 4.42 Days
Continuous
J2406 @ Jasper Maint  
EPCOR 03-Jul-17 07:00 07-Jul-17 17:00 4.42 Days
Continuous
TX1 @ Cloverbar Doble  
EPCOR 04-Jul-17 07:00 04-Jul-17 17:00 10 Hours
Continuous
1044L ( Jasper - Petrolia ) Doble  
ALTALINK 04-Jul-17 08:00 04-Jul-17 12:00 4 Hours
Daily
252s (704L/7L50) - GOI Cut Open Point A into 704L-10. Open Point A needed to isolate 252s2 for breaker replacement later on.  
BCH 04-Jul-17 09:00 21-Jul-17 09:00 17 Days
Continuous
1L275 (799s Coleman - Natal) structure replacements (end-of-life) AB-BC
ALTALINK 04-Jul-17 12:00 04-Jul-17 17:00 5 Hours
Daily
1081L Bay(17s) - GOI Adjust 240kV switch(17s32), East and West phase out of adjustment.  
EPCOR 05-Jul-17 07:00 07-Jul-17 17:00 2.42 Days
Continuous
TX3 @ Poundmaker Tapchanger maint  
ALTALINK 05-Jul-17 08:30 06-Jul-17 17:00 1.35 Days
Continuous
74s102(C3) GOI Breaker maintennace  
EPCOR 07-Jul-17 07:00 08-Jul-17 17:00 1.42 Days
Continuous
TX1 @ Genesee Tapchanger maint  
EPCOR 07-Jul-17 07:00 19-Jul-17 17:00 12.42 Days
Continuous
1044L ( Jasper - Petrolia ) Steel Pole Refurbishment  
EPCOR 09-Jul-17 07:00 09-Jul-17 17:00 10 Hours
Continuous
TX2 @ Genesee Tapchanger maint  
EPCOR 10-Jul-17 07:00 10-Jul-17 17:00 10 Hours
Continuous
C2401,C2403 @ Cloverbar Doble  
EPCOR 10-Jul-17 07:00 14-Jul-17 17:00 4.42 Days
Continuous
J2405 @ Jasper Maint  
EPCOR 10-Jul-17 07:00 14-Jul-17 17:00 4.42 Days
Continuous
L2404 @ Lambton Maint  
ATCO 10-Jul-17 07:00 19-Jul-17 17:00 9.42 Days
Continuous
801S 900 BUS 2 • Remove existing B protection 87 relays from panel B14.
• Install new 900BS2 A relay.
• Connect prepped wiring and complete cutover.
• Test CT inputs to the new 900BS2 A and B relays.
• Test Breaker and MOD control
• Relay testing.
• Test protection tripping.
• Remove 50TG CT’s from 900BS2.
 
ALTALINK 10-Jul-17 07:30 11-Jul-17 19:00 1.48 Days
Continuous
275s T1 and 240kV Bus 1 - GOI 240kV Protection testing and final bus installation at 275s2152 and 275s39  
ALTALINK 10-Jul-17 12:15 21-Jul-17 16:15 11.17 Days
Continuous
163s T2 (Tx18482) GOI Replace 163s T2 Bushings, T2 Maintenance  
ALTALINK 10-Jul-17 13:00 13-Jul-17 15:00 3.08 Days
Continuous
42s916E - GOI 240kV breaker maintenance  
ATCO 11-Jul-17 10:00 12-Jul-17 13:00 27 Hours
Continuous
720S 502R,720S 504R,720S 901T,720S 501R GOI to Sample bushings and set up Oil Processor
25 KV reactors out of service for duration of outage
 
EPCOR 12-Jul-17 07:00 13-Jul-17 17:00 1.42 Days
Continuous
CD2405 @ Castledowns Doble  
EPCOR 14-Jul-17 07:00 14-Jul-17 17:00 10 Hours
Continuous
909LW Dome- SUNDANCE (310P) Doble  
ALTALINK 14-Jul-17 10:00 14-Jul-17 13:00 3 Hours
Daily
252s (704L/7L50) - GOI Close Open Point C To 704L-10.  
EPCOR 16-Jul-17 07:00 18-Jul-17 17:00 2.42 Days
Continuous
TX1 @ Cloverbar Tapchanger maint  
EPCOR 17-Jul-17 07:00 21-Jul-17 17:00 4.42 Days
Continuous
J2401 @ Jasper Maint  
ENMAX 17-Jul-17 08:00 17-Jul-17 16:00 8 Hours
Continuous
918L Doble PT 918, RB133  
ATCO 17-Jul-17 13:00 20-Jul-17 15:00 3.08 Days
Continuous
876S 902T 3 Phase Tap changer, Manufacturer upgrade, 902T. All Load to be carried on 901T and 501VR  
ENMAX 18-Jul-17 08:00 20-Jul-17 16:00 2.33 Days
Continuous
833L. 12B138-833 12B138-833: HV BRK Inspect (Day 2-3) & Doble (day 1)  
ATCO 24-Jul-17 07:00 27-Jul-17 17:00 3.42 Days
Continuous
7L64 Reroute 7L64 from 789s old to 789s new substation, 747s, 748s, and 779s will be radial fed from 930s Arcenciel  
EPCOR 24-Jul-17 07:00 28-Jul-17 17:00 4.42 Days
Continuous
J2408 @ Jasper Maint  
ALTALINK 24-Jul-17 07:30 30-Jul-17 17:30 6.42 Days
Continuous
39s T1(Tx 18107) - GOI Replacing bushings  
ATCO 24-Jul-17 13:00 27-Jul-17 15:00 3.08 Days
Continuous
809S 902T Maintain 902T/Tapchanger and 702 Bkr, Load Carried on 901T and breaker 701  
ALTALINK 25-Jul-17 10:30 08-Aug-17 15:30 14.21 Days
Continuous
157s794X (affects 794L) GOI Connect new T2 and 157s652. New construction on 25 kV Bus will be connected as well. Connect new VT4 (138 kV Bus 2) at same time.  
ALTALINK 26-Jul-17 09:00 26-Jul-17 13:00 4 Hours
Daily
I_485s Telecom 1041/1036L De-energized The MW radio between 120S Picture Butte and 554S Travers requires firmware upgrade to avoid unplanned outage. This outage requires 1041L and 1036L to be opened AT THE SAME TIME for three hours, up to four for contingencies. Upgrade required in order to avoid any unplanned breakdown or malfunction of the system.  
ATCO 28-Jul-17 07:00 02-Aug-17 17:00 5.42 Days
Continuous
7L62,797S 701T Reroute line into new Keg River substation, modify 7L62D3 from DLO to LS/LD
Work Sequence

- transfer 5L457 to adjacent sub

- Issue GOI 2-33607A (Isol. pts - 702A, 7L62D2, 7L62PTX @ 789s, 7L62D4, 701TD1 @ 797s)
- line work, modify 7L62D3
- Plains Midstream outage reqd

- Collapse GOI to 7L62D3 @ 797s
- issue 2-33607B, then release 2-33607A
- re-energize 797s

- restore 5L457 external load transfer to normal

- continue 7L62 line reroute into 789s
 
EPCOR 31-Jul-17 07:00 04-Aug-17 17:00 4.42 Days
Continuous
TX3 @ Jasper Maint  
ALTALINK 31-Jul-17 07:30 03-Aug-17 12:30 3.21 Days
Continuous
39s T2(Tx 5778) - GOI Replacing bushings  
ATCO 01-Aug-17 07:00 08-Aug-17 17:00 7.42 Days
Continuous
7L73,730S 703 Upgrade 7L73 protection and install teleprotection and new RAS @ 730s, 829s radial fed from 800s.  
SUNCOR 02-Aug-17 08:00 08-Aug-17 20:00 6.5 Days
Continuous
29PL9-13 (29EDD-34 - 29EDD-65) maintenance from 29PS-216 to 29PS-201  
BCH 07-Aug-17 09:00 18-Aug-17 17:00 11.33 Days
Continuous
2L294 (Nelway - A.A. Lambert) maintenance - BC maintenance does not affect AB ATC AB-BC
ATCO 08-Aug-17 07:00 11-Aug-17 17:00 3.42 Days
Continuous
7L59 Reroute to new substation
7L59 OOS TO OPEN TEMP JUMPER "J1" AND CREATE ISOLATING POINT. (786s - 7L59D4 AND 7L59D5, 789s - 7L59D1 AND 7L59D2, 890s - 7LA59D1,
PORTION OF 7L59 WILL BE OOS TO Reroute to new substation (7L59 J1, 789s - 7L59D1 AND 7L59D2)
7L59 OOS TO MAKE UP JUMPER 7L59 J1. (786s - 7L59D4 AND 7L59D5, 789s - 7L59D1 AND 7L58D2, 890s - 7LA59D1)
 
SUNCOR 09-Aug-17 08:00 15-Aug-17 20:00 6.5 Days
Continuous
29PL9-12 (29EDD-34 - 29EDD-65) 5 YR maintenance - from 29PS220 to 29PS-63 SLD - SL30-P-141-106 & SL30-P141-109  
ATCO 12-Aug-17 07:00 15-Aug-17 17:00 3.42 Days
Continuous
7L58 Reroute 7L58 from 789s old to new substation  
ATCO 15-Aug-17 07:00 22-Aug-17 17:00 7.42 Days
Continuous
7L73,800S 702 Upgrade 7L73 protection and install TPR and new RAS.  
ATCO 15-Aug-17 08:00 17-Aug-17 16:00 2.33 Days
Continuous
826S 901T Routine Maintenance on 901T, 902T will remain in service, 502R 20 MVAR reactor unavailable for dispatch  
ENMAX 15-Aug-17 08:00 29-Aug-17 16:00 14.33 Days
Continuous
6.80L. 30.81L (SWCRR)-Connect last spans of the relocated 6.80L to the existing line at 146 Ave and 35 sub locations.Portion of 6.80L and 30.81will be decomissioned. 6.80 will feed 35s from 6s on return.  
ALTALINK 21-Aug-17 07:30 28-Sep-17 12:00 38.19 Days
Continuous
RATD 929L(74s-63s)& breakers,287s stati Build and cut in 929L into Hazelwood and rename to 1082L  
ALTALINK 21-Aug-17 08:00 14-Sep-17 09:00 24.04 Days
Continuous
RATD 925L(74s-63s)GOI Build and cut in new QQ towers for Hazelwood  
BCH 21-Aug-17 09:00 01-Sep-17 17:00 11.33 Days
Continuous
5L92 (Cranbrook - Selkirk) CBK 5CVT4 replacement - - BC maintenance does not affect AB ATC AB-BC
ALTALINK 21-Aug-17 09:30 25-Aug-17 17:30 4.33 Days
Continuous
170L (799s - 632s) - GOI structure replacements  
ATCO 22-Aug-17 08:00 24-Aug-17 16:00 2.33 Days
Continuous
826S 902T Routine Maintenance on 902T, 901T will remain in service, 503R, 504R 20 MVAR reactors unavailable for dispatch, Stn service will be on 5L263 alternate source  
ALTALINK 24-Aug-17 07:00 01-Oct-17 17:00 38.42 Days
Continuous
916L (42s-5s) GOI [SWCRR] SWCRR Line construction  
ALTALINK 24-Aug-17 07:00 01-Oct-17 17:00 38.42 Days
Continuous
693L (42s-C10s) GOI [SWCRR] SWCRR Line construction  
ENMAX 24-Aug-17 08:00 25-Aug-17 16:00 1.33 Days
Continuous
50L. 21.2TR. 21PT138-Z31 TR Bushing/CT replacement. TR DIFF Relay Replacement. Outage required for crane  
ALTALINK 29-Aug-17 07:30 01-Sep-17 17:30 3.42 Days
Continuous
170L (799s - 632s) - GOI structure replacements  
ENMAX 30-Aug-17 08:00 13-Sep-17 16:00 14.33 Days
Continuous
35.81L(temporary) (SWCRR)-Energization only. New 35.81 settings into 35 Sub. Connect new/permanent 35.81L to 42 S and 35 sub  
SUNCOR 04-Sep-17 08:00 22-Sep-17 20:00 18.5 Days
Continuous
29EDD-3 29PT-6 oil leak repairs  
ATCO 05-Sep-17 07:00 12-Sep-17 17:00 7.42 Days
Continuous
7L75 Upgrade 7L75 protection and install new TPR and RAS  
EPCOR 05-Sep-17 07:00 29-Sep-17 17:00 24.42 Days
Continuous
TX1 @ Dome Bushing Replacement  
ALTALINK 05-Sep-17 08:00 13-Sep-17 17:00 8.38 Days
Continuous
71s 138kV West Bus & T1 - Advice Replace 71s25 A Phase PT & T1 Leak Repairs  
BCH 05-Sep-17 09:00 08-Sep-17 17:00 3.33 Days
Continuous
5L96 (Selkirk - Vaseux Lake) arcing horn install and spacer replacement - BC maintenance does not affect AB ATC AB-BC
BCH 05-Sep-17 09:00 15-Sep-17 17:00 10.33 Days
Continuous
1L274 (Elkford Tap - Elkford) annual maintenance AB-BC
ALTALINK 05-Sep-17 11:00 14-Sep-17 17:00 9.25 Days
Continuous
69s T4 TX18298- GOI Replace T4 Bushing and perform T4 Maintenance  
ALTALINK 06-Sep-17 09:30 08-Sep-17 17:30 2.33 Days
Continuous
170L (799s - 632s) - GOI structure replacements  
BCH 06-Sep-17 10:30 08-Sep-17 17:30 2.29 Days
Continuous
1L275 (799s Coleman - Natal) AltaLink: structure replacements advise AB-BC
BCH 11-Sep-17 09:00 15-Sep-17 17:00 4.33 Days
Continuous
5L98 (BCH Nicola - Vaseux Lake) annual maintenance - BC maintenance does not affect AB ATC AB-BC
ALTALINK 11-Sep-17 09:30 15-Sep-17 17:30 4.33 Days
Continuous
170L (799s - 632s) - GOI structure replacements  
BCH 11-Sep-17 11:00 15-Sep-17 16:00 4.21 Days
Continuous
1L274 (Elkford Tap - Elkford) annual maintenance  
ALTALINK 18-Sep-17 08:00 21-Sep-17 17:00 3.38 Days
Continuous
62s T3(Tx 18053) - GOI Replacing S protection  
ALTALINK 18-Sep-17 08:00 21-Sep-17 17:00 3.38 Days
Continuous
71s23 (920L) - Advice Replace 71s23 240kV VTs (Like for Like)  
BCH 18-Sep-17 09:00 22-Sep-17 17:00 4.33 Days
Continuous
2L294 (Nelway - A.A. Lambert) structure replacement - BC maintenance does not affect AB ATC AB-BC
ATCO 19-Sep-17 07:00 20-Sep-17 17:00 1.42 Days
Daily
7L696 To mitigate some of the areas on 7L79 and 7L696 that really get affected by hoar frost. This mitigation is to install inter phase spacers between A and C phase so that they cannot get close to each other as frost comes off of the wire.  
ATCO 19-Sep-17 08:00 21-Sep-17 15:00 2.29 Days
Continuous
791S 702,7L81 Install new 7L81 RASA & RASB  
BCH 25-Sep-17 09:00 06-Oct-17 17:00 11.33 Days
Continuous
5L94 (Cranbrook - 102s Langdon) AltaLink line maintenance AB-BC
ALTALINK 25-Sep-17 09:00 06-Oct-17 17:30 11.35 Days
Continuous
1201L (520s Bennett - BCH Cranbrook) annual maintenance AB-BC
ALTALINK 25-Sep-17 11:00 28-Sep-17 15:00 3.17 Days
Continuous
102s SVC - GOI SVC maintenance  
EPCOR 02-Oct-17 07:00 06-Oct-17 17:00 4.42 Days
Continuous
CDS25 @ Cloverbar disconnect replacement  
ALTALINK 02-Oct-17 07:30 05-Oct-17 17:30 3.42 Days
Continuous
62s201 (801L) - GOI Replacing 801L "A" protection  
ENMAX 02-Oct-17 08:00 13-Oct-17 16:00 11.33 Days
Continuous
37.82L. 37s & Janet 138KV Bus Differential Protection Line Protection Upgrade  
ALTALINK 09-Oct-17 07:30 12-Oct-17 17:30 3.42 Days
Continuous
62s202 (202L) - GOI Replacing 202L "A" protection  
ALTALINK 15-Oct-17 08:00 10-Nov-17 17:00 26.42 Days
Continuous
910L (89s-288s) GOI [SWEATD] 910L reconfig @ 289s  
ALTALINK 15-Oct-17 08:00 13-Nov-17 17:00 29.42 Days
Continuous
914L (89s-86s) GOI [SWEATD] 914L reconfig @ 289s  
ATCO 16-Oct-17 07:00 29-Oct-17 18:00 13.46 Days
Continuous
840S CONVERTER McNeill 2017 Fall turn around. Site shut down for maint. work. AB-SK
BCH 16-Oct-17 09:00 27-Oct-17 17:00 11.33 Days
Continuous
2L293 (Selkirk - Nelway) BCH - annual maintenance - BC maintenance does not affect AB ATC AB-BC
ATCO 17-Oct-17 07:00 19-Oct-17 17:00 2.42 Days
Daily
7L696 To mitigate some of the areas on 7L79 and 7L696 that really get affected by hoar frost. This mitigation is to install inter phase spacers between A and C phase so that they cannot get close to each other as frost comes off of the wire.  
ENMAX 17-Oct-17 08:00 18-Oct-17 16:00 1.33 Days
Continuous
21.80L. 21.1TR. 20.82L. 21.4TR. TAU CAP VOLT TR TR Bushing/CT replacement. TR DIFF Relay Replacement  
ENMAX 13-Nov-17 08:00 24-Nov-17 16:00 11.33 Days
Continuous
28.80L. 28s & Sarcee 138KV Bus Differential Protection Line Protection Upgrade  
ALTALINK 13-Nov-17 10:00 16-Nov-17 17:00 3.29 Days
Continuous
63s (912L - A732s) - GOI Replace A and B Line Protection  
ALTALINK 15-Nov-17 08:00 05-Dec-17 17:00 20.38 Days
Continuous
1043L (320p-E816s) GOI [SWEATD] 1043L reconfig  
ATCO 27-Nov-17 07:00 30-Nov-17 17:30 3.44 Days
Continuous
9L01 9L01 Install piles for new structures for Thickwood tap.  
ATCO 02-Feb-18 07:00 09-Feb-18 17:30 7.44 Days
Continuous
9L07 (1) Install 9L07 cut in structures for new 951S Thickwood Hills substation.  
ATCO 09-Feb-18 07:00 11-Feb-18 17:30 2.44 Days
Continuous
9L07 (2) String new portion 9L01/9L30 over 9L07 for new 951S Thickwood Hills substation.  
ATCO 15-Feb-18 07:00 24-Feb-18 17:30 9.44 Days
Daily
9L01 9L01 Cut in for in and out addition of 951S Thickwood Hills substation. Install new structures.  
ATCO 27-Feb-18 07:00 04-Mar-18 18:00 5.46 Days
Continuous
7L22 Build junction for new in and out POD 2030S Hughes  
ATCO 10-Sep-18 09:00 14-Sep-18 17:00 4.33 Days
Continuous
801S 901T 801S Anderson 901T Re-test Sept 10, 2018  
ATCO 18-Sep-18 07:00 20-Sep-18 17:30 2.44 Days
Continuous
9L01 9L01 Cut in for in and out addition of 951S Thickwood Hills substation. Remove bypass at substation.  
ATCO 25-Sep-18 07:00 27-Sep-18 17:30 2.44 Days
Continuous
9L07 Cut in 951S Thickwood Hills substation.  

AB-BC, AB-SK & AB-MATL: refer to AESO web posting: http://itc.aeso.ca/itc/public/reportIndex.do
Also,
AB-BC, AB-SK & AB-MATL: refer to ISO Rule 203.6: http://www.aeso.ca/rulesprocedures/18592.html

Prepared On: 2017-05-18   4:54:58 PM


This document and the information contained herein are based upon information and data which by their nature contain a degree of uncertainty and are subject to change. In addition, this document may contain information and data from public sources and/or third parties, which have been assumed to be accurate and complete and have not been verified. Accordingly, the Independent System Operator, operating as the Alberta Electric System Operator (the "AESO") makes no warranty, representation or guarantee, express or implied, with respect to this document or the information contained herein, including, but not limited to, any warranty, representation or guarantee of accuracy, completeness, timeliness, reliability, availability, absence of computer virus, non- infringement, merchantability or suitability for any purpose. Under no circumstances will the AESO, its members, officers, employees, contractors or agents, or any of their respective affiliates, be liable for any errors or omissions in, or any losses, damages or claims whatsoever, whether in contract, tort or otherwise, arising from use of or reliance upon, this document or any information contained herein.

© 2009 Alberta Electric System Operator. All rights reserved