I've found an entire PDF file on transmission projects that have been identified by the Alberta Electric System Operator.

High River-Black Diamond Line Replacement
Altalink has replaced the 69kV 158L transmission line between the High River and Black Diamond substations which was completed in summer of 2013.

Northwest Calgary 69kV System Upgrade
ENMAX is working to upgrade the rest of the aging 69kV system in the city of Calgary to 138kV which includes upgrading six substations and replacing the older lines.

Edmonton Aging System Upgrades
EPCOR is working to replace existing underground 72kV circuits as well as upgrading the existing 72kV system to a closed loop system to improve reliability.

West Lethbridge Substation
Altalink has plans to build a new 240kV source substation in West Lethbridge due to increased demand on their current North Lethbridge source station.

Southern Alberta Transmission Development
Altalink is constructing new 240kV circuits throughout southern Alberta to create an extensive closed loop system to connect more generation to the Alberta Interconnected Electric System (AIES).

Southern Alberta 69kV System Upgrade
Altalink is upgrading part of the 69kV loop system in southern Alberta due to thermal overloads on the existing system.

Chinook Substation
Lethbridge Power is proposing to build a new 138kV/13.8kV substation on the western side of the city to increase reliability issues with the exisiting Bowron Substation.

Fort McMurray 500kV Development
Altalink and ATCO Electric has plans to build two new 500kV transmisison lines between the Edmonton area to the Fort McMurray area to connect generation from the Edmonton area to industrial customers in the Fort McMurray area.

Foothills Area Transmission Development
Altalink is building a new 240kV line between the existing Piegan Substation near Fort Macleod to a new source substation east of High River.

Northwest Calgary Substation
Altalink is planning on building a third 240kV source substation due to increased demand in the northwest side of the city.

Downtown Calgary Transmisison Reinforcement
Altalink is planning on building a new source 240kV substation just outside of downtown Calgary to increase reliability.

Western Alberta Transmission Line
Altalink has built a new 500kV HVDC line between the Sunnybrook Substation near Edmonton to the Crossings Substation near Calgary.

Eastern Alberta Transmisison Line
Altalink and ATCO Electric have built a new 500kV HVDC line between the Heartland Substation near Edmonton to the Newell Substation near Brooks.

Heartland Transmisison Line
Altalink has built a new double circuit 500kV line between the existing Ellerslie Substation in Edmonton to the approved Heartland Substation near Redwater.

Hanna Region Transmission Reinforcement
ATCO Electric is building a new 240kV source substation near Hanna to strengthen the existing transmission system as well as upgrading multiple 72kV lines to 144kV.