The board of trustees for San Antonio-owned CPS Energy will need a new leader because the chairwoman is resigning.
The announcement from Aurora Geis came as the utility is facing a multibillion-dollar hike in the projected cost for two more units at the South Texas Project.
San Antonio Mayor Julian Castro had pushed for Geis to resign from the five-member board, which will recommend a replacement. The San Antonio City Council has the authority to approve a new board member. Castro says the issue will be taken up next week.
Geis on Tuesday offered a tentative Jan. 25 date for her board resignation, unless a replacement is chosen sooner.
CPS Energy seeks to expand its two-unit nuclear complex about 90 miles southwest of Houston. Recent cost estimates topped the preliminary $13 billion figure.