Ltd. became a public company in March 1968, with shares traded on the Toronto Stock Exchange. During the 1970s, the company expanded into the natural gas and petroleum industries, and into the electricity industry in the 1980s. In 2004, with the deregulation of the retail energy industry in Alberta, ATCO sold the retail operations of ATCO Gas and ATCO Electric to Direct Energy Marketing Ltd. (DEML) while ATCO Gas and ATCO Electric still operated as "distributors" (owning and operating the infrastructure that delivers natural gas or electricity in its service territories). As part of the sale to DEML, DEML contracted call center and billing services from ATCO I-Tek. In 2016, ATCO re-entered the retail energy industry in Alberta as ATCOenergy. In 2018, ATCO acquired 40% of the shares in Neltume Ports, a South American port terminal operator. In 2022, ATCO agreed to pay a fine after overcharging for work on a new transmission line. References External links Holding companies of Canada Electric power companies of Canada Natural gas companies of Canada Electric power companies of Australia Companies based in Calgary Energy companies established in 1947 Non-renewable resource companies established in 1947 1947 establishments in Alberta Companies listed on the Toronto Stock Exchange