AltaGas Ltd. named Linda Sullivan and Nancy Tower as independent board directors, effective Jan. 8.

Sullivan previously served as the CFO of American Water Works Co. Inc., while Tower is president and CEO of Tampa Electric Co., according to a Jan. 8 news release. AltaGas also said Daryl Gilbert will retire from his board member position, effective after the conclusion of the gas utility's annual shareholder meeting in May.

AltaGas' board of directors will be made up of 11 directors after Gilbert's departure from the company.

AltaGas is an energy infrastructure company focused on regulated utilities, midstream and power.