Pacific Gas and Electric announced the appointment of a chief executive and 10 new board members on Wednesday to improve the “safety culture and operational effectiveness” at the embattled California utility.

Bill Johnson, a former head of Progress Energy and the Tennessee Valley Authority, will fill the chief executive position held by Geisha Williams, who left in January, just before PG&E filed for its second bankruptcy in the last two decades.

PG&E faces tens of billions of dollars in liabilities related to catastrophic wildfires over the last two years. In addition, climate change is making natural disasters more destructive, and shifts to green energy are upending the industry.

“We have heard the calls for change and have taken action today to ensure that PG&E has the right leadership to bring about real and dynamic change that reinforces our commitment to safety, continuous improvement and operational excellence,” the board said in a news release. “We believe our new C.E.O. and the newly constituted board will help PG&E address California’s evolving energy challenges and deliver what our customers expect from their energy company.”