A member of the Arizona Corporation Commission who has been urging the state's largest electric utility to disclose whether it spent millions in the 2014 commission election has issued subpoenas demanding the company provide the information.
The subpoenas issued to Arizona Public Service and its parent company Thursday up the ante in Commissioner Bob Burns' quest to get the information.
APS has been the subject of ongoing speculation that it spent $3.2 million backing the 2014 elections of two commissioners. The company won't confirm or deny that it contributed to groups backing the candidates.
APS spokesman Jim McDonald said the company is reviewing the subpoena.
The company disclosed early this month that it has received federal grand jury subpoenas seeking information about the 2014 commission and secretary of state election.