Edmonton to Calgary Transmission Reinforcement

As part of our commitment to stakeholders, the AESO provides regular updates on transmission projects underway within our jurisdiction. To provide timely and comprehensive information to stakeholders, this dedicated webpage will be updated as necessary throughout the construction of two high-voltage direct current transmission lines between the Edmonton and Calgary regions.

For historical background information on the Edmonton to Calgary Transmission Reinforcement please click here.

ATCO Electric Ltd. is the Transmission Facility Owner (TFO) responsible for building the east line (Eastern Alberta Transmission Line or EATL). ATCO Electric’s Facility Application which proposed a right-of-way for this line on the eastern side of the province, connecting the Heartland hub northeast of Edmonton to a southern hub in the Brooks area, was approved by the Alberta Utilities Commission (AUC) November 15, 2012.

AltaLink Management Ltd. is the Transmission Facility Owner (TFO) responsible for building the west line (Western Alberta Transmission Line or WATL). AltaLink’s Facility Application which proposed a right-of-way for this line in the west/centre portion of the province, connecting the existing Wabamun Lake hub west of Edmonton to the Calgary area hub near Langdon, was approved the AUC on December 6, 2012.

Careful coordination of outages during project construction is required to maintain reliable system operation and to minimize disruption to market participants. Stakeholders are reminded that over the lifespan of this complex project, information regarding operating limits, transmission line outages, and potential generator curtailments is subject to change. Participants are encouraged to keep apprised of the project status by checking this page, as well as the AESO’s two outage reports: Long Term Critical Outages and Approved Outages which can be found on the AESO website under Grid Operations > Outages.

Single line diagrams will also be published periodically throughout the project to provide a snapshot of the expected topology of the system based on information available at each stage.

EATL Transmission Construction Outages & Operating Limits

Transmission Line Outages

Scheduled Start

Scheduled End

Total SOA Cut Plane Limit (MW)

Comments

System Normal

Dec 2012

Dec 31, 2013

800 MW

Based on system studies. Also refer to ISO Rule section 302.1 for curtailment protocol.

 933L (801s Anderson – 28s West Brooks)  June 8, 2013
08:00H
 June 9, 2013
18:00H
Continuous
 620 MW  Based on system studies. Also refer to ISO Rule section 302.1 for curtailment protocol.
 935L (356s Milo – 324s Cassils)  July 6, 2013
08:00H
 July 7, 2013
18:00H
Continuous
 800 MW  Based on system studies. Does not change the system normal operating limits.
 933L (801s Anderson – 28s West Brooks)  July 6, 2013
08:00H
 July 7, 2013
18:00H
Continuous
 620 MW  Based on system studies. Also refer to ISO Rule section 302.1 for curtailment protocol.
 931L (132s Ware Junction – 28s West Brooks)  July 13, 2013
08:00H
 July 17, 2013
18:00H
Continuous
 620 MW  Based on system studies. Also refer to ISO Rule section 302.1 for curtailment protocol.
 923L (356s Milo – 324s Cassils)  July 13, 2013
08:00H
 July 14, 2013
18:00H
Continuous
 800 MW  Based on system studies. Does not change the system normal operating limits.
 9L59 (801s Anderson – 972s Tinchebray)  Aug 23, 2013
07:00H
Aug 29, 2013
18:00H
Continuous 
 620 MW  Based on system studies. Also refer to ISO Rule section 302.1 for curtailment protocol.
 9L950 (801s Anderson – 132s Ware Junction)  Sept 1, 2013
07:00H
 Sept 7, 2013
19:00H
Continuous
 620 MW  Based on system studies. Also refer to ISO Rule section 302.1 for curtailment protocol.
 923L (356s Milo – 324s Cassils)  Dec 7, 2013
08:00H
 Dec 8, 2013
18:00H
Continuous
 800 MW  Based on system studies. Does not change the system normal operating limits.
 935L (356s Milo – 324s Cassils)  Dec 14, 2013
08:00H
 Dec 15, 2013
18:00H
Continuous
 800 MW  Based on system studies. Does not change the system normal operating limits.

Alberta Electric System Operator (AESO)
Effective May 31, 2013

WATL Transmission Construction Outages & Operating Limits

Transmission Line Outages

Scheduled Start

Scheduled End

Total KEG Cut Plane Limit (MW)

Comments

System Normal (no KEG transmission elements out of service) and SOK flow less than or equal to 1850 MW OR BC-AB import less than or equal to 500 MW

Fall 2011

Nov 30, 2013

2520 MW

Based on system studies. Also, refer to expedited OPP-517 (AESO website)

 System Normal (no KEG transmission elements out of service) and SOK flow greater than 1850 MW AND BC-AB import greater than 500 MW  Fall 2011 Nov 30, 2013  2450 MW Based on system studies. Also, refer to expedited OPP-517 (AESO website)
Alberta Electric System Operator (AESO)
Effective May 31, 2013
 

For further information contact:
Cam Bush
Manager - Operations Coordination
ph: 403-705-5204