1954
|
.
|
AltaGas Utilities
|
1965
|
.
|
Pacific Northern Gas Ltd.
|
2002
|
.
|
Heritage Gas
|
2009
|
.
|
Commercial operations began
|
2014
|
.
|
Commercial operations began
|
2015
|
.
|
Commercial operations began
|
2018
|
.
|
AltaGas Canada
|
2020
|
.
|
TriSummit Utilities
|