In 2017, AltaGas agreed to purchase WGL Holdings, significantly expanding its presence in the United States.

[4] AltaGas operates regulated utilities that store and deliver natural gas to end‑users across North America.

[2] The Midstream segment expanded its customer base in 2011 after its purchase of Pacific Northern Gas Ltd for $146.1 million.

[6] As part of its Midstream expansion strategy, AltaGas concluded a deal with Birchcliff Energy for a long-term natural gas processing arrangement in 2018.

[7] It also entered into a joint venture with a privately held producer in the Montney shale play to construct a deep-cut natural gas processing facility.