Enstar Natural Gas Co., Alaska’s top natural gas distributor, is ready to be sold to yet another Canadian firm.

Calgary-based energy infrastructure firm AltaGas Ltd. is bowing out, and Calgary’s TriSummit Utilities Inc. is moving in with the final approval secured from Alaskan regulators.

The sale includes AltaGas’ 100% interest in Enstar, which has about 150,000 customers. It also includes the Alaska Pipeline Co., which operates transmission and distribution pipelines for Enstar and the company’s 65% indirect interest in Cook Inlet Natural Gas Storage Alaska (Cingsa), a commercial state-regulated natural gas storage facility.

Enstar and Cingsa will continue to operate as standalone utilities and remain headquartered in Alaska, according to AltaGas.

AltaGas previously...