Katherine Blunt, a reporter for the Wall Street Journal, has led much of the coverage that has revealed the repeated failures of Pacific Gas and Electric. In her new book, “California Burning,” and in this week’s podcast, she looks at the unique structure of public utilities and how PG&E went from an innovative company run by engineers to a culture of dollars first, safety last. She examines what deregulation did to the company, the companies two bankruptcies, and the risks the company still poses to citizens and ratepayers.