While California's powerful Public Utilities Commission has taken steps to address controversies over its oversight of the state's utilities, state lawmakers and critics of the agency urge it to adopt tougher rules on a huge obstacle to reform: the revolving door between the PUC and the power industry. Over the past 20 years, a number of high-ranking officials at the state Public Utilities Commission -- including its top boss for 12 years, Michael Peevey -- joined the agency after working for utilities that the PUC regulates, or landed jobs in the power industry after stints at the PUC.