Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2020-07-11

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.

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Owner From To Duration Element Scheduled Activity Affected Intertie
ATCO 24-Jan-20 08:00 11-Sep-20 18:00 231.38 Days
Continuous		 2029s ACF13 (2029s Heathfield) Forced outage repairs  
ALTALINK 22-Jun-20 09:00 24-Jul-20 18:00 32.38 Days
Continuous		 180L (255s Vulcan - 928s East Stavely) OPGW install  
ATCO 06-Jul-20 07:00 17-Jul-20 17:30 11.44 Days
Continuous		 13L50 (2029s Heathfield - 2075s Newell) T11 testing  
ALTALINK 06-Jul-20 07:00 17-Jul-20 17:30 11.44 Days
Continuous		 13L50 (A2029s - A2075s) ATCO - Info ATCO: T11 Testing ,Inspections ,IR Camera Installs, nLFL Testing and Expansion Tank Sensor Replacement.  
ENMAX, ALTALINK 06-Jul-20 08:00 21-Jul-20 18:00 15.42 Days
Continuous		 36.81L (44s Bearspaw - ENMAX 36) Haskayne line raise project  
ATCO 06-Jul-20 08:00 30-Aug-20 16:00 55.33 Days
Continuous		 826s 902T (826s Marguerite Lake) breaker fail protection upgrade  
REDDEER 06-Jul-20 09:00 13-Jul-20 15:30 7.27 Days
Continuous		 209s T1 (209s Timberlands) routine maintenance  
ATCO 06-Jul-20 10:00 13-Jul-20 15:00 7.21 Days
Continuous		 7L40 XARM change out  
ATCO, ALTALINK 06-Jul-20 11:00 11-Jul-20 16:00 5.21 Days
Continuous		 898s 501R (898s Heart Lake), 898s 902T (898s Heart Lake), 788L (898s Heart Lake - 788AL), 789L (898s Heart Lake - 1034s Margie) Isolate 902T, 704, 708, 501 and test  
ALTALINK 06-Jul-20 12:15 12-Jul-20 17:45 6.23 Days
Continuous		 163s T5 (163s Amoco Empress) bushing replacement, maintenance, doble testing  
EPCOR 07-Jul-20 07:00 16-Jul-20 17:00 9.42 Days
Continuous		 1058L (657s Summerside - 803s Lambton) line maintenance  
ATCO 09-Jul-20 10:00 19-Jul-20 16:00 10.25 Days
Continuous		 7L59 Cross- Arm change out  
ATCO 12-Jul-20 08:00 12-Jul-20 10:00 2 Hours
Continuous		 898S 904 PRC-005 - TRIP COIL TESTING - BREAKER 904-A @ 898S
Isolate Breaker test trip coils

Breaker 904 will be out of service for the duration of work		  
ATCO 12-Jul-20 10:00 12-Jul-20 12:00 2 Hours
Continuous		 898S 905 PRC-005 - TRIP COIL TESTING - BREAKER 905-A @ 898S
Isolate Breaker test trip coils

Breaker 905 will be out of service for the duration of work		  
ATCO 12-Jul-20 12:00 12-Jul-20 14:00 2 Hours
Continuous		 898S 906 PRC-005 Test 906 Trip Coil(s), only one breaker tested at a time, approximate testing time per breaker = 2 hours  
ATCO 12-Jul-20 14:00 12-Jul-20 16:00 2 Hours
Continuous		 898S 908 PRC-005 Test 908 Trip Coil(s), only one breaker tested at a time, approximate testing time per breaker = 2 hours  
ATCO 12-Jul-20 16:00 12-Jul-20 18:00 2 Hours
Continuous		 898S 909 PRC-005 Test 909 Trip Coil(s), only one breaker tested at a time, approximate testing time per breaker = 2 hours  
EPCOR 13-Jul-20 07:00 17-Jul-20 17:00 4.42 Days
Continuous		 Genesee 1202 Doble  
ALTALINK 13-Jul-20 07:30 16-Jul-20 16:30 3.38 Days
Continuous		 511s ACF13 GOI Annual Filter Bank outage, maintenance, inspection. All Other AC Filters to remain in-service and available for Link power transfer requirements  
ATCO 13-Jul-20 08:00 16-Jul-20 17:00 3.38 Days
Continuous		 856S 901T TRANSFORMER CLASS1 MAJOR TESTING @ KINOSIS 856S 901T

Dist. Load Fed from other subs		  
ATCO 13-Jul-20 08:30 15-Jul-20 16:30 2.33 Days
Continuous		 732S 901T Major Testing 901T, 144KV ring bus open during outage, all load carried by 902T  
ALTALINK 13-Jul-20 08:30 15-Jul-20 16:30 2.33 Days
Continuous		 359s T2 (Tx 18548) - GOI Install new CT’s load side of T2. Test CTs and CT loops  
ALTALINK 13-Jul-20 09:00 15-Jul-20 18:00 2.38 Days
Continuous		 71s1552, 71s1652, 71s1752 (920L & 942L) Replacing M/O Breaker with a new SF6 Breaker  
EPCOR 13-Jul-20 09:00 15-Jul-20 18:00 2.38 Days
Continuous		 ALTALINK - 920LE - GOI @ CASTLEDOWNS Replacing M/O Breaker with a new SF6 Breaker @ Lamoureux 71s  
BCH 13-Jul-20 09:00 16-Jul-20 17:00 3.33 Days
Continuous		 2L113 (B1s Natal - B2s Cranbrook) disconnect maintenance AB-BC
ALTALINK 13-Jul-20 09:15 16-Jul-20 17:45 3.35 Days
Continuous		 63s2652 GOI 63s2652L PRC5 Maintenance and 1st trip, also will be replacing the grading caps on 63s2652  
ALTALINK 13-Jul-20 09:30 16-Jul-20 16:30 3.29 Days
Continuous		 510s1452 (ACF 14) - GOI Annual inspection & maintenance  
ALTALINK 13-Jul-20 12:30 16-Jul-20 18:00 3.23 Days
Continuous		 163s1352 GOI PRC 5 and perform 1st and 2nd trip , then maintain 240kV HLR- E minimum oil breaker.  
ALTALINK 14-Jul-20 09:15 15-Jul-20 17:45 1.35 Days
Continuous		 28s R1(Tx18490) GOI PRC5 and 1st trip on 28s44 then doble test 28sR1  
EPCOR 15-Jul-20 07:00 21-Jul-20 17:00 6.42 Days
Continuous		 1045L ( E805S - 310P - 320P ) Line Maintenance  
ALTALINK 15-Jul-20 08:00 17-Jul-20 17:00 2.38 Days
Continuous		 69s 240kV Bus & 913L - GOI Scope of work includes replacing structure 142F  
ALTALINK 15-Jul-20 08:30 15-Jul-20 17:00 8.5 Hours
Daily		 28s T2 (TX18775) GOI fix the timing on the tapchanger  
ATCO 15-Jul-20 09:30 15-Jul-20 17:00 7.5 Hours
Continuous		 741S 702, 7L199 741S Breaker 702 PRC-005 - Trip Coil Testing - 7L199 Open Ended  
ALTALINK 15-Jul-20 18:00 23-Jul-20 18:00 8 Days
Continuous		 71s 1552 (71s Lamoureux) Replacing M/O Breaker with a new SF6 Breaker  
ALTALINK 16-Jul-20 07:00 17-Jul-20 17:00 1.42 Days
Continuous		 920L (37s - E557s) - GOI Urgent line clearance mitigation on Structures #4 & 5  
ALTALINK 19-Jul-20 07:15 20-Jul-20 17:45 1.44 Days
Continuous		 3L (42s - 272s) GOI Installing Street Light south of structure 446  
ALTALINK 20-Jul-20 07:00 21-Jul-20 12:00 29 Hours
Continuous		 729L (542s - 285s) GOI Insulator Wash Program: Strs 204B to 209, 241 to 256, 259, 260, 268 to 270, 286 to 289  
ATCO 20-Jul-20 07:00 23-Jul-20 16:00 3.38 Days
Continuous		 801S 905 801S Anderson 905 BREAKER MIN OIL HLR COMPLETE TESTING

BKR 905 Complete Maint

9L97 to Oakland fed off of 906 only		  
BCH 20-Jul-20 08:30 28-Jul-20 17:00 8.35 Days
Continuous		 2L112 (Boundary - Nelway) bpa outage/BCH disconnect maintenance AB-BC
ALTALINK 20-Jul-20 09:00 20-Jul-20 13:00 4 Hours
Daily		 511s Partial 500kV DC Bus - GOI Replace failed K3 relay in 511s6257 motor mech  
ALTALINK 20-Jul-20 09:00 20-Jul-20 19:00 10 Hours
Daily		 848L(17s - 848L490E) GOI Scope of work includes installing a bridge along 848L between structures 204 and 207  
ATCO 20-Jul-20 09:00 21-Jul-20 17:00 1.33 Days
Continuous		 722S 702, 7L84 BREAKER MIN OIL HLR COMPLETE TESTING

PRC- 005 relays, trip coils aux coils, complete main.		  
ATCO 20-Jul-20 10:00 27-Jul-20 15:00 7.21 Days
Continuous		 7L40 XARM change out  
ALTALINK 21-Jul-20 07:00 24-Jul-20 17:00 3.42 Days
Continuous		 912L(63s - A766s) GOI Install phase raiser assemblies on all 3 phases at 912L Str 59 & 60 to mitigate ground clearance violation.  
ENMAX 21-Jul-20 08:00 21-Jul-20 11:00 3 Hours
Continuous		 65B240-D132 SF6 Sample  
BCH 21-Jul-20 09:00 23-Jul-20 09:00 2 Days
Continuous		 1L275 (799s Coleman - Natal) markerball installation AB-BC
ENMAX 21-Jul-20 11:00 21-Jul-20 13:00 2 Hours
Continuous		 65B240-D130 SF6 Sample  
ENMAX 21-Jul-20 13:00 21-Jul-20 16:00 3 Hours
Continuous		 65B240-D133 SF6 sample  
EPCOR 22-Jul-20 07:00 26-Jul-20 17:00 4.42 Days
Continuous		 1098L ( E805S - Poundmaker ) Line Maintenance  
ALTALINK 22-Jul-20 07:00 28-Jul-20 17:00 6.42 Days
Continuous		 1098L (E805s-EPOUND_M) Epcor - Info Line Maintenance  
ENMAX 22-Jul-20 08:00 25-Jul-20 16:00 3.33 Days
Continuous		 21.80L Move double structures on Sarcee Trail. HV Breaker maintenance. 21B138-21.80  
ALTALINK 22-Jul-20 09:00 23-Jul-20 18:00 1.38 Days
Continuous		 753L (65s - 253s) GOI Insulator Wash Program: 753L Structures 1,2, 13B, 14 to 27, 153 to 156, 167, 168  
ATCO 22-Jul-20 10:00 23-Jul-20 17:00 31 Hours
Continuous		 722S 701, 7L39 (811s Clairmont Lake - 7L39 tap) 722S 701 BREAKER MIN OIL HLD COMPLETE TESTING
Breaker complete testing, PRC005 aux relays, trip coils relay testing		  
ALTALINK 23-Jul-20 07:00 23-Jul-20 17:00 10 Hours
Daily		 848L(17s - 848L490E) GOI Scope of work includes installing a bridge along 848L between structures 204 and 207  
ALTALINK 24-Jul-20 08:00 24-Jul-20 14:00 6 Hours
Daily		 74s 240kV B2 Bus GOI Creating open point 'A' in 240kV B2 Bus.  
EPCOR 26-Jul-20 07:00 04-Aug-20 17:00 9.42 Days
Continuous		 Dome S/S 909L-E bay Doble, Cutover, commissioning and energization of new S/S expansion for 72 kV upgrade  
ALTALINK 27-Jul-20 07:00 30-Jul-20 18:00 3.46 Days
Continuous		 879L (368s - 244s) GOI Insulator Wash Program: Structures 588 to 731, 192 to 201  
EPCOR 27-Jul-20 07:00 31-Jul-20 17:00 4.42 Days
Continuous		 Jasper TX1 Doble  
EPCOR 27-Jul-20 07:00 31-Jul-20 17:00 4.42 Days
Continuous		 Castle Downs S/S Tx2 Outage Outage required for protection upgrade project  
ATCO 27-Jul-20 08:00 30-Jul-20 17:00 3.38 Days
Continuous		 7L24 Replacing Cross-Arms, Poles and Ground Rod's  
ALTALINK 27-Jul-20 10:00 30-Jul-20 18:00 3.33 Days
Continuous		 63s 2752 GOI 63s2752 Breaker maintenance PRC5 Priority work (1st Trip) , & Grading Cap replacements  
ATCO 27-Jul-20 10:00 02-Aug-20 16:00 6.25 Days
Continuous		 7L113 Line inspection and insulator change  
ALTALINK 27-Jul-20 10:45 29-Jul-20 17:15 2.27 Days
Continuous		 42s76, C2 and C3 GOI repair trip latch on center phase and replace 2 capacitors on C3  
ATCO 27-Jul-20 12:00 30-Jul-20 12:00 3 Days
Continuous		 828S 7L72 Protection Relay, 828S 7L93 Protection Relay, 930S 7L93 Protection Relay Change 144kV Line settings at 930S & 828S to close 7L93D3 @ 828S for SULPHUR POINT MAINTENANCE OUTAGE 2-52610

7L72 & 7L93 Tied together for the duration of the work By 7L93D3		  
ALTALINK 27-Jul-20 13:00 30-Jul-20 15:30 3.1 Days
Continuous		 163s T1(TX18483) GOI maintain, doble, and install IDD  
ALTALINK 28-Jul-20 07:00 29-Jul-20 18:00 1.46 Days
Continuous		 170L (799s - 632s) GOI P5 170L24 Urgent Repair. AB-BC
EPCOR 28-Jul-20 07:00 04-Aug-20 17:00 7.42 Days
Continuous		 909L ( E665S - 89S ) Line Maintenance  
ATCO 28-Jul-20 10:00 02-Aug-20 15:00 5.21 Days
Continuous		 7L80 (733s Simonette - 740s H.R.Milner) Line inspection and Repair  
ALTALINK 30-Jul-20 07:00 30-Jul-20 18:00 11 Hours
Daily		 676L(368s - 523s) GOI Insulator Wash Program: Structures 192 to 201 Double ciricuit with 879L  
ALTALINK 30-Jul-20 08:15 30-Jul-20 17:15 9 Hours
Daily		 5sT1 (Tx18903) GOI IDD investigate low voltage sensor issue  
ATCO 31-Jul-20 12:00 31-Jul-20 16:00 4 Hours
Continuous		 847S 902T CNRL is requesting assistance with 260kV line switching at the 847S Muskeg River substation for the purpose of testing.

July 31st 12:00pm – ATCO Electric to Open breaker 903 at the Muskeg River 847S substation
July 31st – After 903 breaker is confirmed open, we will request ATCO Electric open 904 breaker at 847S substation to put GT-2 in an island state
July 31st 14:00 – Muskeg River CRO will re-synchronize breaker 904 at the Muskeg River 847S substation
July 31st – After 904 is closed we will request ATCO Electric close 903 breaker at the Muskeg River 847S substation		  
ATCO 02-Aug-20 18:00 10-Aug-20 18:00 8 Days
Continuous		 847S 902T CNRL Albian Sands - Request for a Condition guarantee from ATCO to isolate 902T  
EPCOR 03-Aug-20 07:00 07-Aug-20 17:00 4.42 Days
Continuous		 Castle Downs S/S Tx1 Outage Outage required for protection upgrade project  
ATCO 03-Aug-20 07:00 03-Nov-20 17:00 92.46 Days
Continuous		 972S 905B Halkirk 2 Windfarm Project  
EPCOR 04-Aug-20 07:00 04-Aug-20 17:00 10 Hours
Continuous		 C2404 Doble  
ATCO 04-Aug-20 07:00 06-Aug-20 16:00 2.38 Days
Continuous		 801S 907 801S Anderson 907 BREAKER MIN OIL HLR PARTIAL TESTING

BKR 907 Partial Maint.

SHEERNESS UNIT 1 TIED TO SYSTEM BY BKR 906 ONLY		  
ALTALINK 04-Aug-20 07:15 05-Aug-20 17:45 1.44 Days
Continuous		 916L (42s - 5s) GOI Scope of includes maintenance on Str 15  
ALTALINK 04-Aug-20 07:30 04-Aug-20 17:30 10 Hours
Daily		 138s603 Advice for customer 138 kV switch maintenance by customer  
ATCO 04-Aug-20 08:00 06-Aug-20 17:00 2.38 Days
Continuous		 7L24 Replacing Cross-Arms, Poles and Ground Rod's  
ENMAX 04-Aug-20 08:00 04-Sep-20 16:00 31.33 Days
Continuous		 24.83L GT68 Transmission Line Relocate. Phasing required on return  
ALTALINK 04-Aug-20 09:00 07-Aug-20 18:00 3.38 Days
Continuous		 786L/1L275 (799s - Natal) GOI P5 786L Urgent Repair Str's Range 76-117. AB-BC
ATCO 04-Aug-20 10:00 10-Aug-20 15:00 6.21 Days
Continuous		 7L40 XARM change out  
EPCOR 05-Aug-20 07:00 10-Aug-20 17:00 5.42 Days
Continuous		 909L ( E665S - 310P ) Line Maintenance  
ALTALINK 05-Aug-20 08:00 06-Aug-20 16:00 1.33 Days
Continuous		 1082L (63s-287s) - Advice Modify synch check logic on breaker 63S2752 and remove PLC reclosing on 63S2652. Test L7 – 1082L reclosing and synch logic after completing modifications.  
ALTALINK 06-Aug-20 07:15 06-Aug-20 17:45 10.5 Hours
Daily		 1041L(554s - 370s) GOI Scope of includes maintenance on Str 1041L254. Double circuit with 940L  
ALTALINK 06-Aug-20 07:15 06-Aug-20 17:45 10.5 Hours
Daily		 180L (15s - 928s) GOI Insulator Wash Program:Structures 544, 545 2nd Scope: maintenance on str 540  
ALTALINK 07-Aug-20 07:00 07-Aug-20 17:00 10 Hours
Daily		 848L(17s - 848L490E) GOI Scope of work includes installing a bridge along 848L between structures 204 and 207  
ALTALINK 08-Aug-20 08:00 08-Aug-20 17:00 9 Hours
Daily		 1058L (E803s-E657s) - GOI Scope of work includes maintenance on strs 2, 7 and 17  
ALTALINK 08-Aug-20 08:00 08-Aug-20 17:00 9 Hours
Daily		 908L (89s-E52s-38s) - R/B-LL Required for work on 1058L due to proximity  
EPCOR 08-Aug-20 08:00 08-Aug-20 17:00 9 Hours
Continuous		 ALTALINK - 1058L - GOI @ LAMBTON / SUMMERSIDE Job Scope: Scope of work includes maintenance on strs 2, 7 and 17  
ALTALINK 10-Aug-20 07:00 10-Aug-20 18:00 11 Hours
Daily		 202L (61s - 62s) GOI Insulator Wash Program: Str 134 to 138; 143, 144, 150 to 153, 157 to 163  
EPCOR 10-Aug-20 07:00 12-Aug-20 17:00 2.42 Days
Continuous		 Castle Downs S/S Tx2 Outage Outage required for protection upgrade project  
EPCOR 10-Aug-20 07:00 14-Aug-20 17:00 4.42 Days
Continuous		 Lambton TX1 Doble / SFRA  
EPCOR 10-Aug-20 07:00 21-Aug-20 17:00 11.42 Days
Continuous		 TX3 @ Jasper DGA monitor  
ALTALINK 10-Aug-20 07:15 13-Aug-20 17:45 3.44 Days
Continuous		 914L (87s - 63s) Advice SCADA upgrade  
ALTALINK 10-Aug-20 07:30 13-Aug-20 18:30 3.46 Days
Continuous		 428s733X (733L) Advice protection upgrades  
ATCO 10-Aug-20 08:00 13-Aug-20 17:00 3.38 Days
Continuous		 7L24 Replacing Cross-Arms, Poles and Ground Rod's  
ATCO 10-Aug-20 08:30 13-Aug-20 16:00 3.31 Days
Continuous		 801S 906 801S Anderson 906 BREAKER MIN OIL HLR COMPLETE TESTING

SHEERNESS UNIT 1 TIED TO SYSTEM BY BKR 907 ONLY		  
ALTALINK 10-Aug-20 09:00 14-Aug-20 18:00 4.38 Days
Continuous		 786L/1L275 (799s - Natal) GOI P5 786L Urgent Repair Str's Range 76-117. AB-BC
ALTALINK 10-Aug-20 09:00 20-Aug-20 18:00 10.38 Days
Continuous		 71s1652 - GOI Replacing M/O Breaker with a new SF6 Breaker  
ATCO 11-Aug-20 06:30 11-Aug-20 17:00 10.5 Hours
Continuous		 786S SVC 786S SPRING SVC AIR COOLED MAINTENANCE

Complete Spring Maintenance and Software Upgrade

SVC Out of Service for the Duration of the Work		  
ATCO 11-Aug-20 08:00 11-Aug-20 17:00 9 Hours
Continuous		 7L32 To complete FAC-008 violation mitigation  
ALTALINK 11-Aug-20 08:00 11-Aug-20 18:00 10 Hours
Daily		 830L (562s Cypress - 840s McNeill Station) Reframe 830L82 with horizontal line post insulators and lower Fortis cross arm to mitigate line clearance violation. AB-SK
ALTALINK 11-Aug-20 09:00 11-Aug-20 10:00 60 Mins
Daily		 575s719N Breaker open Upgrade MPLS node @ 575s. Breakeropen required for system stability due to loss of 719L (378s-575s) A & B TPR.  
ATCO 12-Aug-20 09:00 12-Aug-20 17:00 8 Hours
Continuous		 930S SVC 930S SPRING 2020 SVC AIR COOLED MAINTENANCE

Complete Spring Maintenance and Software Upgrade

SVC Out of Service for the Duration of the Work		  
ALTALINK 12-Aug-20 09:30 12-Aug-20 14:30 5 Hours
Daily		 102s SVC GOI spray and pull weeds in the SVC fenced area  
ATCO 13-Aug-20 08:00 16-Aug-20 08:00 3 Days
Continuous		 847S 901T CNRL Albian Sands - Request for a Condition guarantee from ATCO to isolate 901T  
ALTALINK 14-Aug-20 07:15 14-Aug-20 17:45 10.5 Hours
Daily		 922L (17s - 310p) GOI Scope of includes maintenance on Str 461  
EPCOR 17-Aug-20 07:00 21-Aug-20 17:00 4.42 Days
Continuous		 Lambton Tx2 Doble/ SFRA  
EPCOR 17-Aug-20 07:00 21-Aug-20 17:00 4.42 Days
Continuous		 Jasper TX3 Doble  
ATCO 17-Aug-20 07:00 28-Aug-20 17:00 11.42 Days
Continuous		 2029S ACF14 PRC-005 - TRIP COIL TESTING - BREAKER 1221-A @ 2029S

BREAKER 1221 (10BF14) @ 2029S

Filter will be unavailable, One device worked on at a time

Depending on power transfer level, reduce voltage mode will be activated.		  
ALTALINK 17-Aug-20 07:15 20-Aug-20 17:45 3.44 Days
Continuous		 914L (87s - 86s) Advice SCADA upgrade  
ATCO 17-Aug-20 08:00 20-Aug-20 17:00 3.38 Days
Continuous		 7L24 Replacing Cross-Arms, Poles and Ground Rod's  
ALTALINK 17-Aug-20 09:00 21-Aug-20 18:00 4.38 Days
Continuous		 786L/1L275 (799s - Natal) GOI P5 786L Urgent Repair Str's Range 76-117. AB-BC
ATCO 17-Aug-20 10:00 24-Aug-20 15:00 7.21 Days
Continuous		 7L40 XARM change out  
ATCO 17-Aug-20 10:00 30-Aug-20 16:00 13.25 Days
Continuous		 7L59 Cross- Arm change out  
ATCO 18-Aug-20 08:00 18-Aug-20 16:00 8 Hours
Continuous		 7L69 Pole relocate for Customer  
ATCO 20-Aug-20 08:00 24-Aug-20 16:00 4.33 Days
Continuous		 7L22 811S Clairmont Lake Protection Upgrade Project
Wiring modification to 21A/7L22 & 21B/7L22
708CT modification, 708 Logic/Alarms, SCADA updates, SCADA End-End Checks and 1Z wiring		  
EPCOR 24-Aug-20 07:00 28-Aug-20 17:00 4.42 Days
Continuous		 Dome TX1 Maintenance / Doble  
ALTALINK 24-Aug-20 08:00 03-Sep-20 18:00 10.42 Days
Continuous		 1325L (510s - 511s) - GOI Annual inspection & maintenance  
ATCO 24-Aug-20 09:00 28-Aug-20 16:00 4.29 Days
Continuous		 755S 903, 9L27 (755s Cordel - 863s Paintearth) Repair leaks on Breaker, require manufacturer representative on site.
Repair leaks on BKR 903 repair 903A, 9L29D1

Ring bus open as well as 9L27 OOS		  
ALTALINK 24-Aug-20 09:15 28-Aug-20 17:45 4.35 Days
Continuous		 887L (48s - BCK) GOI excavating soil to reduce grade between strs 8, 9, maintenance on Strs 12, 44 and replacing Structures 27, 53, 56, 57, 58 AB-BC
ALTALINK 24-Aug-20 10:00 28-Aug-20 11:30 4.06 Days
Daily		 17s11 - GOI Replace 17s11 breaker fail and control module  
ALTALINK 24-Aug-20 12:30 03-Sep-20 12:30 10 Days
Continuous		 74s352, 74s252 (929L) GOI Replace 138kV switches 3N and 3X.  
ALTALINK 25-Aug-20 08:00 27-Aug-20 17:30 2.4 Days
Continuous		 370s T6(TX18509) GOI maintenance, doble  
ALTALINK 25-Aug-20 08:00 28-Aug-20 17:00 3.38 Days
Continuous		 202L (62s-61s) - GOI Fire Mitigation / Maintenance on Strs 137, 138, 139, 141, 156 and 163  
ALTALINK 25-Aug-20 08:30 27-Aug-20 17:00 2.35 Days
Continuous		 574s T1 TX18796 - GOI PRC-5 574sT1 Maintenance & Doble. Neutral conductor replacement, Oil Leak, AC supply and SFRA Testing.  
ALTALINK 27-Aug-20 08:00 27-Aug-20 10:00 2 Hours
Continuous		 17s26 - Advice Trip test 17s6 from new s11 breaker fail  
ENMAX 27-Aug-20 08:00 28-Aug-20 18:00 1.42 Days
Continuous		 1003L Power factor test HV LA 25MD240-1003. Replace switch mech SW140, SW141  
ALTALINK 27-Aug-20 10:00 27-Aug-20 12:00 2 Hours
Daily		 17s29 - Advice Trip test 17s7 from new s11 breaker fail  
ALTALINK 27-Aug-20 12:00 27-Aug-20 15:00 3 Hours
Daily		 17s31 - Advice Trip test 17s1 from new s11 breaker fail  
ALTALINK 27-Aug-20 13:00 27-Aug-20 17:00 4 Hours
Daily		 794L (157s Lac La Biche - 819s Whitby Lake) Scope of includes maintenance on Str 170  
ALTALINK 27-Aug-20 15:00 27-Aug-20 18:00 3 Hours
Daily		 17s42 - Advice Trip test 17s10 from new s11 breaker fail  
ALTALINK 28-Aug-20 08:00 28-Aug-20 11:00 3 Hours
Daily		 17s46 - Advice Trip test 17s2852 from new s11 breaker fail  
ALTALINK 28-Aug-20 12:00 28-Aug-20 15:00 3 Hours
Daily		 17s58 - Advice Trip test 17s12 from new s11 breaker fail  
EPCOR 31-Aug-20 07:00 31-Aug-20 17:00 10 Hours
Continuous		 Petrolia 1164L Doble  
EPCOR 31-Aug-20 07:00 23-Oct-20 17:00 53.42 Days
Continuous		 TX4 @ Jasper Bushing Replacement & Oil Work  
ATCO 31-Aug-20 08:00 03-Sep-20 16:00 3.33 Days
Continuous		 7L39 (811s Clairmont Lake - 7L39 tap) Wiring modification to 21A/7L39 & 21B/7L39
709CT modification, 709 Logic/Alarms, SCADA updates, SCADA End-End Checks and 1Z wiring		  
ATCO 31-Aug-20 08:00 14-Sep-20 12:00 14.17 Days
Continuous		 731S 701T, 7L03 731S Elmworth Bkr Replacement and Protection Upgrade

Outgae on 701T/7L03 (Isolation points - 501VRA, 501VRB,
501VRX, 700D1, 7L03D4, TBD for mobile sub on 25 kV bus)		  
ALTALINK 31-Aug-20 08:00 21-Sep-20 14:00 21.25 Days
Continuous		 19s T8(352s, 2739s & 133L), T10, 19s 138 Outage to replace 19s72, 19s156 & 138kV string insulators  
ATCO 31-Aug-20 08:00 25-Oct-20 16:00 55.33 Days
Continuous		 826S 901T 240/144kV Breaker Fail Protection
(901T OOS for duration of outages)

826S Marguerite P&C Upgrade		  
BCH 31-Aug-20 09:00 11-Sep-20 17:00 11.33 Days
Continuous		 5L91 (Ashton Creek - Selkirk) insulator replacement AB-BC
ATCO 31-Aug-20 10:00 06-Sep-20 15:00 6.21 Days
Continuous		 7L40 XARM change out  
ALTALINK 31-Aug-20 12:30 03-Sep-20 17:00 3.19 Days
Daily		 275s5 GOI 1st trip to be done and then PRC5 maintenance and replace grading capacitors.  
EPCOR 01-Sep-20 07:00 01-Sep-20 17:00 10 Hours
Continuous		 915L Doble Testing  
BCH 01-Sep-20 08:00 01-Sep-20 18:00 10 Hours
Continuous		 5L52 (Custer - Ingledow) BPA outage AB-BC
ALTALINK 01-Sep-20 09:00 01-Sep-20 17:00 8 Hours
Daily		 17s 240kV SBus 2 - GOI Bus outage to remove 1081L Dead End from Switch and Lattice Structure. Line Crew will tie this back to the lattice for switch replacement  
BCH 01-Sep-20 09:00 03-Sep-20 17:00 2.33 Days
Continuous		 Natal T1 (BCH Natal) disconnect maintenance AB-BC
ALTALINK 01-Sep-20 09:00 09-Sep-20 17:00 8.33 Days
Continuous		 1081L (17s-281s) - GOI Replace 17s1081 Underhung Switch and MOD, 17s23 switch, 17s32 switch  
EPCOR 02-Sep-20 07:00 02-Sep-20 17:00 10 Hours
Continuous		 947L Doble Testing  
ALTALINK 02-Sep-20 07:00 03-Sep-20 05:00 22 Hours
Daily		 263s Strachan 138kV Bus 1, T1, 718L (250p Bighorn Plant - 263s Strachan), 870L (262s Rocky Mountain House - 263s Strachan) 24hour outage to replace 263s1,138kv motor operated disconnect switch, qty 24 string glass insulators to be changed out.  
ENMAX 02-Sep-20 08:00 02-Sep-20 12:00 4 Hours
Continuous		 25B240-D140 SF6 Sample  
ENMAX 02-Sep-20 08:00 10-Sep-20 12:00 8.17 Days
Continuous		 162.1TR Online Monitoring Installation. Install a new tap changer controller (DEV 90) and test/commission.  
ALTALINK 02-Sep-20 09:00 03-Sep-20 15:00 30 Hours
Continuous		 17s56, 17s76 - Advice Replace 17s926N Control Module, Advices required to allow for test operation for 17s926N without isolating at 42s  
ENMAX 03-Sep-20 08:00 03-Sep-20 11:00 3 Hours
Continuous		 25B240-D141 SF6 Sample  
ENMAX 03-Sep-20 11:00 03-Sep-20 13:00 2 Hours
Continuous		 25B240-D142 SF6 Sample  
ALTALINK 03-Sep-20 11:00 03-Sep-20 18:00 7 Hours
Daily		 74s 240kV B2 Bus GOI Close open point in 240kV B2 Bus.  
ENMAX 03-Sep-20 13:00 03-Sep-20 16:00 3 Hours
Continuous		 25B240-D138 SF6 Sample  
ATCO 04-Sep-20 08:00 06-Sep-20 16:00 2.33 Days
Continuous		 7L68 Wiring modification to 21A/7L68 & 21B/7L68
707CT modification, 707 Logic/Alarms, SCADA updates, SCADA End-End Checks and 1Z wiring		  
ALTALINK 05-Sep-20 08:00 12-Sep-20 18:00 7.42 Days
Continuous		 428s23 (PCES01L) GOI protection upgrades, breaker maintenance (428s23)  
ALTALINK 07-Sep-20 07:15 10-Sep-20 17:45 3.44 Days
Continuous		 464L (87s - 209s) Advice SCADA upgrade  
ATCO 07-Sep-20 08:00 07-Sep-20 17:00 9 Hours
Continuous		 939S 903T, 939S 900BS2, 939S 900BS3, 9L10 Livock Pile Heaving Project -
Connect bypass to 900BS3 and 900BS2
Create open jumper J1 between 900BS3 and 900D1
Update relay settings too		  
SUNCOR 07-Sep-20 08:00 20-Sep-20 18:00 13.42 Days
Continuous		 29EDD-34 line outage to perform 5/10yr PM 29PL6-38 buss and transformers:
29EDD34;29PP-102 SYSTEM;PM 5y,10y,
29EDD34;29PL6-38 SYSTEM;PM 5y,10y,
29EDD34;29PT-340 SYSTEM;PM 5y,10y
Open valve for sample 29pt340 at 29EDD34		  
ATCO 07-Sep-20 16:00 14-Oct-20 17:00 37.04 Days
Continuous		 939S 900BS1, 939S 700BS1, 939S 901T Livock Pile Heaving Project - Outage on 901T, 900BS1, and 700BS1  
ALTALINK 08-Sep-20 10:30 10-Sep-20 17:30 2.29 Days
Continuous		 71s452 (787L) - GOI Maintenance on 71s452 including 1st trip testing. 71s7 contact replacement. 71s787X maintenance.  
ALTALINK 09-Sep-20 09:00 09-Sep-20 17:00 8 Hours
Daily		 17s 240kV SBus 2 - GOI . Bus outage to transfer 1081L slack span from Lattice Structure to new 1081 switch. Line Crew will be completing the work.  
ENMAX 10-Sep-20 12:00 16-Sep-20 16:00 6.17 Days
Continuous		 162.2TR (162s Beddington) Online Monitoring Installation. Install a new tap changer controller (DEV 90) and test/commission.  
EPCOR 14-Sep-20 07:00 25-Sep-20 17:00 11.42 Days
Continuous		 CV5 @ Castledowns & Victoria maint and splice repair  
ENMAX 14-Sep-20 08:00 14-Sep-20 11:00 3 Hours
Continuous		 25B240-D139 SF6 Sample  
ATCO 14-Sep-20 08:00 25-Sep-20 17:00 11.38 Days
Continuous		 840S McNeill Station 840S McNeill Fall 2020 Outage

PRC-005 Maintenance		 AB-SK
ATCO 14-Sep-20 08:00 28-Sep-20 16:00 14.33 Days
Continuous		 7L32 710CT modification, 710 Logic/Alarms, SCADA updates, SCADA End-End Checks and 1Z wiring  
ALTALINK 14-Sep-20 08:30 17-Sep-20 16:30 3.33 Days
Continuous		 510s1252 (ACF 12) - GOI Annual inspection & maintenance  
ALTALINK 14-Sep-20 09:00 16-Sep-20 16:00 2.29 Days
Continuous		 2s T1 (Tx18633) / 87L GOI 138kV VT Replacement  
ALTALINK 14-Sep-20 09:00 24-Sep-20 18:00 10.38 Days
Continuous		 1201L (520s Bennett - BCH Cranbrook) Structure range 187-508 Component's and Fire Mitigation( 95050674) AB-BC
ALTALINK 14-Sep-20 09:30 18-Sep-20 17:00 4.31 Days
Continuous		 17s 240kV SBus 2 - GOI Replace 240B2 (south bus) strain insulators, replace 1ph bus CVT  
ATCO 14-Sep-20 10:00 21-Sep-20 15:00 7.21 Days
Continuous		 7L40 XARM change out  
ENMAX 14-Sep-20 11:00 14-Sep-20 13:00 2 Hours
Continuous		 25B240-D136 SF6 Sample  
ALTALINK 14-Sep-20 11:00 17-Sep-20 17:00 3.25 Days
Continuous		 575s719X (719L) Advice Settings Changes of Sync Check and Functional Testing on CUH90 relay for 575s719X.  
ENMAX 14-Sep-20 13:00 14-Sep-20 16:00 3 Hours
Continuous		 25B240-D135 SF6 Sample  
ALTALINK 15-Sep-20 07:30 16-Sep-20 18:00 1.44 Days
Continuous		 172s 709L & T1 - GOI 172s T1 Bushings, 172sT1 doble, Breaker maintenance on s71 , 172sT1 Top Oil Gauge Req Replacement  
ENMAX 15-Sep-20 08:00 15-Sep-20 11:00 3 Hours
Continuous		 25B240-D134 SF6 Sample  
ENMAX 15-Sep-20 11:00 15-Sep-20 13:00 2 Hours
Continuous		 25B240-D133 SF6 Sample  
ATCO 15-Sep-20 12:01 28-Sep-20 16:00 13.17 Days
Continuous		 7L69 731S Elmworth Bkr Replacement and Protection Upgrade

Outage on 7L69		  
ENMAX 15-Sep-20 13:00 15-Sep-20 16:00 3 Hours
Continuous		 25B240-D132 SF6 Sample  
ENMAX 16-Sep-20 08:00 16-Sep-20 12:00 4 Hours
Continuous		 25B240-D131 SF6 Sample  
ENMAX 17-Sep-20 08:00 17-Sep-20 18:00 10 Hours
Continuous		 21.80L. 20.82L. TAU CAP. 21.1TR. 21.4TR Fall Substation Washing  
ENMAX 17-Sep-20 08:00 23-Sep-20 12:00 6.17 Days
Continuous		 65.1TR Online Monitoring Installation.  
ENMAX 18-Sep-20 08:00 18-Sep-20 18:00 10 Hours
Continuous		 50L. 21.2TR. 138KV PT @ Bearspaw. 21 CAP. 21PT138-Z31 Fall Substation Washing  
EPCOR 21-Sep-20 07:00 22-Sep-20 17:00 1.42 Days
Continuous		 240CV5, and Vic TX5 @ Victoria & Castledowns Doble 250CV5 CVVT/CT's zone at Castledowns, and Low side CVT's of TX5 at Victoria. VDS21 Repair.  
EPCOR 21-Sep-20 07:00 25-Sep-20 17:00 4.42 Days
Continuous		 1044L east @ Jasper - Petrolia Vt Replacement  
ALTALINK 21-Sep-20 07:00 25-Sep-20 17:00 4.42 Days
Continuous		 1044L (E805s-E816s)Epcor - Info Epcor - VT replacement  
ALTALINK 21-Sep-20 07:30 02-Oct-20 18:00 11.44 Days
Continuous		 71s T1 (Tx 18357) - GOI Crews will be replacing the HV & LV bushings; some minor maintenance work will also be completed if time exists  
ATCO 21-Sep-20 08:00 02-Oct-20 17:00 11.38 Days
Continuous		 2029s ACF21 (2029s Heathfield) ACF21 CA-300 CT Upgrades, redundant filter banks in service, no system impact  
ALTALINK 21-Sep-20 08:30 23-Sep-20 16:30 2.33 Days
Continuous		 510s2252 (ACF 22) - GOI Annual inspection & maintenance  
ALTALINK 21-Sep-20 09:30 01-Oct-20 14:00 10.19 Days
Continuous		 17s13 - GOI Replace 17s13 Breaker To New SF6 Type  
ENMAX 22-Sep-20 13:00 22-Sep-20 18:00 5 Hours
Continuous		 23.80L. 23.4TR Fall Substation Washing  
ENMAX 23-Sep-20 12:00 29-Sep-20 16:00 6.17 Days
Continuous		 65.2TR Online Monitoring Installation.  
ENMAX 24-Sep-20 00:00 24-Sep-20 00:00 0 Mins
Continuous		 28.80L. 28.2TR. 28PT138-Z31 Fall Substation Washing  
ALTALINK 28-Sep-20 06:15 16-Oct-20 17:45 18.48 Days
Continuous		 777L (48s - 245s) GOI Maintenance and Structure replacements (Str 15 - 226) AB-BC
ATCO 28-Sep-20 07:00 29-Sep-20 17:00 1.42 Days
Continuous		 9L62 Installing new 240Kv Bay for 620S Goldeye substation connection
String 9L62 into 972S Tinchebray		  
ATCO 28-Sep-20 07:00 02-Oct-20 17:00 4.42 Days
Continuous		 2029S ACF22 ACF22 CA-300 CT Upgrades,Filter will be unavailable for duration of work, reduced redundancy  
EPCOR 28-Sep-20 07:00 31-Dec-20 17:00 94.46 Days
Continuous		 Bellamy Tx1 Bellamy TX1 regasketing work  
ALTALINK 28-Sep-20 07:30 01-Oct-20 17:30 3.42 Days
Continuous		 87s T1(TX18511) Advice SCADA upgrade  
ALTALINK 28-Sep-20 08:00 05-Oct-20 14:00 7.25 Days
Continuous		 19s T8(352s, 2739s & 133L), T10, 19s 240 Replacing 240kV string insulators  
SUNCOR 28-Sep-20 08:00 05-Oct-20 18:00 7.42 Days
Continuous		 29EDD-56 PL9-15 OUTAGE 5YR SYSTEM PM, 29PT-190 AND BREAKER 652-4110:
29EDD-56;29PT-190 SYSTEM;PM 5y,
29EDD-56;652-4110 MAINT & TEST;PM 10y,
Repair OHSW bonds to towers PL9-14/15
29EDD-56 Repair Leak 29PT-190		  
ALTALINK 28-Sep-20 08:30 01-Oct-20 16:30 3.33 Days
Continuous		 510s5172 - GOI Annual inspection & maintenance  
ALTALINK 28-Sep-20 09:00 02-Oct-20 18:00 4.38 Days
Continuous		 1201L (520s Bennett - BCH Cranbrook) Structure range 187-508 Component's and Fire Mitigation( 95050674) AB-BC
ALTALINK 28-Sep-20 10:00 01-Oct-20 17:00 3.29 Days
Continuous		 520s and 1114L(102s-520s) GOI FAC 501 switches 102s2689, 102s130, 102s132 need to be operated and 520s 500kV corona ring is bent and needs adjustment at 502s13 upper bus.  
ATCO 28-Sep-20 10:00 05-Oct-20 15:00 7.21 Days
Continuous		 7L20 (740s H.R.Milner - 810s Dome Cutbank) Replacement of under rated and rotten crossarms  
ENMAX 28-Sep-20 13:00 28-Sep-20 18:00 5 Hours
Continuous		 7.84L. 36.81L. 36.1TR. 36.3TR. 36PT138-Z31. 7PT138-7.84 Fall Substation Washing  
ALTALINK 29-Sep-20 07:45 29-Sep-20 17:45 10 Hours
Daily		 520sT1-4 (Tx18416) GOI fix main tank filter, In coordination with 1114L and 1201L GOI's  
ALTALINK 30-Sep-20 07:45 30-Sep-20 17:45 10 Hours
Daily		 520sR7B (Tx18438) GOI fix rad leak, In coordination with 1114L and 1201L GOI's  
ALTALINK 01-Oct-20 12:30 04-Oct-20 17:00 3.19 Days
Continuous		 368s BUS 2, 722L (107s – 368s) & 107s St Replace 138kV PT's 368s25  
ALTALINK 01-Oct-20 14:30 01-Oct-20 16:30 2 Hours
Daily		 17s995N (995L) - Advice 1.5 Hour outage to 995L (Open at 17s) is required in order to test energize new 17s13 Breaker via 17s12. ACC Issue 17s995N Advice then open 17s12 to Commission New 17s13  
ATCO 05-Oct-20 07:00 09-Oct-20 17:00 4.42 Days
Continuous		 2029S ACF23 ACF23 CA-300 CT Upgrades, Filter will be unavailable for duration of work, reduced redundancy  
ALTALINK 05-Oct-20 07:30 08-Oct-20 17:30 3.42 Days
Continuous		 87s T2(TX18339) Advice SCADA upgrade  
ALTALINK 05-Oct-20 10:45 08-Oct-20 17:45 3.29 Days
Continuous		 266s FSC 1 GOI FAC501 yearly maintenance  
SUNCOR 06-Oct-20 08:00 15-Oct-20 18:00 9.42 Days
Continuous		 29EDD-56 PL6-29 OUTAGE 5YR SYSTEM PM, BUSS 29PP-41E BREAKERS 652-4140:
29EDD-56;29PP-41D & 41E SYSTEM;PM 5y,
29EDD-56;652-4140 MAINT & TEST;PM 10y		  
ENMAX 09-Oct-20 08:00 12-Oct-20 16:00 3.33 Days
Continuous		 162s PT-Z41. 1-GSU-XF-0001 Replace 87-XF1 B differential protection. Commission checks and trip testing  
ENMAX 09-Oct-20 08:00 12-Oct-20 16:00 3.33 Days
Continuous		 162s. 1-GSU HV SW maint SW133, SW132. Replace switch mech. SW132, SW133  
ALTALINK 12-Oct-20 07:30 15-Oct-20 17:30 3.42 Days
Continuous		 87s2352 Advice SCADA upgrade  
BCH 12-Oct-20 09:00 14-Oct-20 17:00 2.33 Days
Continuous		 5L92 (Cranbrook - Selkirk) annual plan request F19 AB-BC
EPCOR 13-Oct-20 07:00 23-Oct-20 17:00 10.42 Days
Continuous		 TX1 @ Petrolia DGA Install  
ATCO 13-Oct-20 10:00 19-Oct-20 15:00 6.21 Days
Continuous		 7L20 (740s H.R.Milner - 810s Dome Cutbank) Replacement of under rated and rotten crossarms  
ALTALINK 13-Oct-20 10:15 15-Oct-20 17:45 2.31 Days
Continuous		 77s T1 - GOI Replace 77sT1 X1&X3 bushings, maintenance  
ATCO 15-Oct-20 08:00 15-Oct-20 17:00 9 Hours
Continuous		 939S 903T, 939S 900BS2, 939S 900BS3, 9L10 Livock Pile Heaving Project
Close jumper and Disconnect Bypass		  
ALTALINK 16-Oct-20 08:00 18-Oct-20 18:00 2.42 Days
Continuous		 74s691 (691L) GOI 1st trip and maintenance  
EPCOR 19-Oct-20 07:00 20-Oct-20 17:00 1.42 Days
Continuous		 Castle Downs S/S Tx1 Outage Outage required for protection upgrade project  
BCH 19-Oct-20 09:00 30-Oct-20 09:00 11 Days
Continuous		 1L274 (B1s BCH Natal - 1D1L274) structure refurbishment AB-BC
EPCOR 21-Oct-20 07:00 23-Oct-20 17:00 2.42 Days
Continuous		 Castle Downs S/S Tx2 Outage Outage required for protection upgrade project  
ATCO 26-Oct-20 07:00 06-Nov-20 17:30 11.48 Days
Continuous		 13L50 (DC LINK) 2075S - NEWELL EATL OUTAGE

2020 EATL Outage:

ATCO would like to request AESO for a 750MW power transfer on EATL 13L50 to occur before our link outage on October 26, 2020.
The power transfer would have to occur approx. 1 hour before our switching on October 26.
The requested power transfer will ensure that our DIW expansion tank alarming is correct.

Inspections

IR Camera Installs

nLFL Testing

Expansion Tank Sensor Replacement		  
ALTALINK 26-Oct-20 08:00 29-Oct-20 18:00 3.42 Days
Continuous		 77s T2, 240/138kV East Bus - GOI Replace 77s38. Replace 240kV East Bus Protection  
ATCO 26-Oct-20 08:00 08-Nov-20 16:00 13.38 Days
Continuous		 9L36 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ATCO 26-Oct-20 10:00 02-Nov-20 15:00 7.25 Days
Continuous		 7L20 (740s H.R.Milner - 810s Dome Cutbank) Replacement of under rated and rotten crossarms  
ALTALINK 02-Nov-20 06:00 06-Nov-20 18:30 4.52 Days
Continuous		 285s T2, T2X, & 25kV South Bus - GOI Replaceme T2 with T2X. Install new SSTX. Cut over feeders to new switchgear building.  
ATCO 09-Nov-20 08:00 23-Nov-20 16:00 14.33 Days
Continuous		 9L37 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ALTALINK 09-Nov-20 09:30 12-Nov-20 17:30 3.33 Days
Continuous		 919L (77S - 310P) - GOI Replace 77s16 CVTs. Replace strain insulators on 919L at 77s.  
ATCO 09-Nov-20 10:00 15-Nov-20 15:00 6.21 Days
Continuous		 7L20 (740s H.R.Milner - 810s Dome Cutbank) Replacement of under rated and rotten crossarms  
ALTALINK 16-Nov-20 06:30 16-Nov-20 18:00 11.5 Hours
Daily		 285s 138kV South Bus - GOI Remove 285s91  
BCH 16-Nov-20 09:00 18-Dec-20 09:40 32.03 Days
Continuous		 1L274 (B1s BCH Natal - 1D1L274) structure refurbishment AB-BC
ALTALINK 16-Nov-20 09:30 19-Nov-20 17:30 3.33 Days
Continuous		 989L (77S - 310P) - GOI Replace 77s31 CVTs  
ALTALINK 16-Nov-20 10:45 19-Nov-20 17:45 3.29 Days
Continuous		 266s FSC 2 GOI FAC501 yearly maintenance  
ATCO 23-Nov-20 10:00 30-Nov-20 15:00 7.21 Days
Continuous		 7L20 (740s H.R.Milner - 810s Dome Cutbank) Replacement of under rated and rotten crossarms  
ALTALINK 26-Nov-20 07:00 26-Nov-20 18:00 11 Hours
Daily		 1034L(324s - 244s) GOI scope of work includes maintenance strs 46 and 236 Require reclose block on 1035L  
ATCO 05-Dec-20 07:00 11-Dec-20 16:00 6.38 Days
Continuous		 9L59 (801s Anderson - 972s Tinchebray) Outage for Garden Plain Wind Project  
ATCO 07-Dec-20 10:00 14-Dec-20 15:00 7.21 Days
Continuous		 7L20 (740s H.R.Milner - 810s Dome Cutbank) Replacement of under rated and rotten crossarms  
ALTALINK 14-Dec-20 07:00 14-Dec-20 18:00 11 Hours
Daily		 748L & 277s Station - GOI Installing new 25kV Bus tie breaker  
ATCO 15-Dec-20 07:00 23-Dec-20 17:00 8.42 Days
Continuous		 730S 702, 730S 704 SVC addition and 144 kv bus rebuild.  
ATCO 21-Dec-20 10:00 23-Dec-20 15:00 2.21 Days
Continuous		 7L20 (740s H.R.Milner - 810s Dome Cutbank) Replacement of under rated and rotten crossarms  
ATCO 04-Jan-21 08:00 09-Jan-21 16:00 5.33 Days
Continuous		 7L07 790S Poplar Hill Protection & SCADA Upgrade

Outage on 7L07		  
ATCO 05-Jan-21 08:00 08-Jan-21 16:00 3.33 Days
Continuous		 9L20 56772 Nevis Transformer Addition
9L20 Open -ended		  
ATCO 09-Jan-21 08:00 12-Jan-21 16:00 3.33 Days
Continuous		 9L912 56772 Nevis Transformer Addition
9L912 Open -ended		  
ALTALINK 11-Jan-21 07:00 11-Jan-21 16:00 9 Hours
Daily		 909L (310p - E665s) - GOI Creating temporary Open Point 'A' @ Structure #1A  
ALTALINK 11-Jan-21 16:00 03-Feb-21 18:00 23.08 Days
Continuous		 909L (Open Point 'A' - E665s) - GOI Preliminary outage request to work on Structures 909L2 - 909L6, installing one new tower, and salvaging one new tower  
ALTALINK 12-Jan-21 07:00 12-Jan-21 16:00 9 Hours
Daily		 1045L (310p - 320p - E805s) - GOI Creating temporary Open Point 'B' @ Structure #31  
ALTALINK 12-Jan-21 16:00 04-Feb-21 18:00 23.08 Days
Continuous		 1045L (310p - Open Point 'B') - GOI Preliminary outage request to work on 1045L Str 12, installing one new tower, and salvaging one new tower.  
ATCO 16-Jan-21 08:00 23-Jan-21 16:00 7.33 Days
Continuous		 7L22 790S Poplar Hill Protection & SCADA Upgrade

Outage on 7L22		  
ATCO 19-Jan-21 10:00 25-Jan-21 17:00 6.29 Days
Continuous		 9L57 (939s Livock - 960s Birchwood Creek) Setting poles, for new OPGW to string in  
ATCO 20-Jan-21 08:00 23-Feb-21 16:00 34.33 Days
Continuous		 951S 900BS2, 951S 908, 951S 906, 951S 903 951S construction for 9L162 & 9L193 addition
AESO should be notified of any changes to below workplan:

Jan 20, 2021 – Feb 20, 2021
Isolation pts: 908B,909A
Impact: BKR 908 OOS
Scope of work: Demo bus & install 909A & 909B
Feb 21, 2021 – Feb 23, 2021
Expand to isolation pts:903B, 906B,908B
Impact: BKR 903,BKR 906, 900BS2 OOS
Scope of work: Make connections to 909A & 912A		  
ATCO 25-Jan-21 08:00 26-Jan-21 16:00 1.33 Days
Continuous		 766S 901T, 9L20, 9L912 56772 Nevis Transformer Addition
Tie-in to the new bus for 902T
901T OOS
9L20 OPEN-ENDED
9L912 OPEN-ENDED		  
ALTALINK 01-Feb-21 07:00 28-Feb-21 18:00 27.46 Days
Continuous		 748L & 277s T1 - GOI Installing a new 138kV Breaker and associated equipment  
ATCO 03-Feb-21 07:00 07-Feb-21 17:00 4.42 Days
Continuous		 9L101 Line move for mine expansion.
Attach new line to existing 9L101		  
ALTALINK 03-Feb-21 18:00 04-Feb-21 16:00 22 Hours
Continuous		 909L (310p - E665s) - GOI Closing temporary Open Point 'A' @ Structure #1A  
ALTALINK 04-Feb-21 18:00 05-Feb-21 16:00 22 Hours
Continuous		 1045L (310p - 320p - E805s) - GOI Closing temporary Open Point 'B' @ Structure #31  
ATCO 15-Feb-21 07:00 02-Mar-21 17:00 15.42 Days
Continuous		 972S 900BS2, 9L16 (1) Outage on 907B and 908A for the installation and commissioning of 907 and 907CT  
ATCO 22-Feb-21 08:00 22-Feb-21 18:00 10 Hours
Continuous		 7L65, 7L77 String over 7L65 and 7L77  
ATCO 24-Feb-21 08:00 26-Feb-21 16:00 2.33 Days
Continuous		 951S 900BS1 951S construction for 240kv expansion - 9L162 & 9L193 addition
Connect 910A to 900BS1
Impact: 900BS1 OOS, BKR 901 OOS, BKR 904 OOS, BKR 907 OOS, 920C OOS		  
ATCO 01-Mar-21 07:00 02-Mar-21 17:00 1.42 Days
Continuous		 972S 900BS2, 9L16 (2) Outage on 9L16 to cut the line over to the new bay  
ALTALINK 04-Mar-21 07:00 04-Mar-21 18:00 11 Hours
Daily		 748L/749AL & 267s Station - GOI Installing a new 138kV Switch & salvaging the existing 138kV Bus  
ATCO 08-Mar-21 07:00 12-Mar-21 17:00 4.42 Days
Continuous		 9L177 Installing new 240Kv Bay (connect 907B to BUS 1) for 620S Goldeye substation connection  
ATCO 23-Apr-21 08:00 26-Apr-21 16:00 3.33 Days
Continuous		 766S 901T Complete CT, PT, P&C cutover, commission
relays and DTT to 770S Three Hills (option 1) or 1-114S
Ghost Pine (option 2)		  
ATCO 27-Apr-21 08:00 30-Apr-21 16:00 3.33 Days
Continuous		 766S 901T Complete P&C cutover, commission relays
and DTT receive from 766S Nevis		  
ATCO 04-May-21 08:00 17-May-21 17:00 13.38 Days
Continuous		 9L02 Louise Creek Rebuild project
Wiring for 903/910BF relays.
CT ratio changes.
Relay programming and functionality.
Commission control, alarms and status.
Blocking procedures for BF protections.		  
ATCO 24-May-21 08:00 06-Jun-21 17:00 13.38 Days
Continuous		 9L40 Louise Creek Rebuild project
Wiring for 903/904BF relays.
CT ratio changes.
Relay programming and functionality.
Commission control, alarms and status.
Blocking procedures for BF protections.		  
ATCO 14-Jun-21 08:00 27-Jun-21 17:00 13.38 Days
Continuous		 9L05 Louise Creek Rebuild project
Wiring for 904/905BF relays.
CT ratio changes.
Relay programming and functionality.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
ATCO 29-Jun-21 08:00 29-Jun-21 16:00 8 Hours
Continuous		 7LA53 Install new 7LA53 deadend for prepping New Line Addition 7L208  
ATCO 30-Jun-21 08:00 14-Jul-21 16:00 14.33 Days
Continuous		 969S 700 BUS Install and connect mobile sub
Connect temp 4160 supply
Restore power through Mobile Sub
Complete installation and commissioning of 702 bay		  
ATCO 05-Jul-21 08:00 18-Jul-21 17:00 13.38 Days
Continuous		 9L939 Louise Creek Rebuild project
Wiring for 905/906BF relays.
CT ratio changes.
Relay programming.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
ATCO 26-Jul-21 08:00 28-Sep-21 17:00 64.38 Days
Continuous		 809S 902T, 9L938 Louise Creek Rebuild project
Replace breakers' 911, 912, and 707.
Add new bus PT 700PT2.
Complete wiring for BF, 21A, 21B, and 701C relays.
CT ratio changes.
Commission apparatus.
Relay programming.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
ATCO 29-Jul-21 08:00 05-Aug-21 17:00 7.38 Days
Continuous		 7L91 P&C wiring and commissioning associated to 7L208 work  
ATCO 02-Sep-21 08:00 03-Sep-21 16:00 1.33 Days
Continuous		 733S 702T, 733S 144kV Bus 733S Simonette Expansion -Connect New Cap Bank
MD Greenview Pod		  
ATCO 04-Oct-21 08:00 17-Oct-21 17:00 13.38 Days
Continuous		 809S 901T Louise Creek Rebuild project
Switch station service to alternate.
Replace bus PT 900PT1.
Complete wiring for BF, 87TA, 87TB, and 51NGR relays.
CT ratio changes.
Commission apparatus.
Relay programming.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
ATCO 14-Dec-21 08:00 21-Dec-21 15:00 7.29 Days
Continuous		 7L40 53455 MD Greenview Load Project
Install and commission new 144kV switches 7L40D? and 7L40D? at T-tap location.
Connect 7L40 to 7LA40D2.		  
ATCO 22-Mar-22 07:00 22-Mar-22 17:00 10 Hours
Continuous		 7L77 7L65 Rebuild Project  
ATCO 29-Jun-22 07:00 01-Jul-22 17:00 2.42 Days
Continuous		 766S 701, 766S 901T RAS modifications for the Pattern Lanfine WAGF project  
ATCO 12-Jul-22 07:00 16-Jul-22 17:00 4.42 Days
Continuous		 774S 701, 7L224 RAS modifications for the Pattern Lanfine WAGF project  
ATCO 27-Jul-22 07:00 31-Jul-22 17:00 4.42 Days
Continuous		 767S 702, 7L760 RAS modifications for the Pattern Lanfine WAGF project  
ATCO 05-Sep-22 08:00 30-Sep-22 16:00 25.33 Days
Continuous		 972S 900BS2 CETO project  
ATCO 22-Oct-22 07:00 02-Nov-22 17:00 11.42 Days
Continuous		 7L129 Re stringing conductor  

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: 2020-06-30   4:13:33 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.

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