This project was part of a $1.42 billion transportation project in Calgary, between Highway 8 and Macleod Trail SE, including reconstruction of Glenmore Trail from Sarcee Trail to east of 37 Street. The southwest portion of the ring road is approximately 21 kilometers. AltaLink power lines and substations had to be relocated and reconfigured to allow the ring road to go through the area. The project included:
Removing approximately 2.5 kilometers (1.5 miles) of 240-kV/138-kV double circuit steel lattice transmission line from Tsuu T'ina Nation land and relocating it underground within the Transportation/Utility Corridor (TUC) south of Glenmore Trail and west of 37 Street Southwest (approximately 3.5 km/2 miles).
Removing approximately one km (0.7 miles) of two two-pole 138-kV transmission line from Tsuu T'ina Nation land and relocating as a double circuit 138-kV transmission line on the south side of Highway 8 within the TUC.
Relocating approximately one km (0.5 miles) of a 240-kV double circuit transmission line further west along Sarcee Trail.
Reconfigure and reterminate the existing transmission structures and transmission lines at the Sarcee 42s Substation to accommodate the proposed interchange at Sarcee Trail and Highway 8.
Alberta Transportation road design was not finalized through the entire design process for AltaLink. Structure heights and locations changed several times before IFCs were issued and the amount of fill over the underground duct bank changed a couple of times. We informed Alberta Transportation that there is a maximum amount of fill that could be placed over the duct bank. If the fill limit is too much the cable cannot dissipate heat, which could result in the cable failing.
The entire project is within the City of Calgary, adjacent to a shopping center and heavily traveled roads. Construction is at the intersection of two of the city’s busiest highways and around a residential area. The initiative required a tunnel 5 feet in diameter casing under two roadways.