SAN FRANCISCO (AP) — California’s top regulator on Friday proposed Pacific Gas & Electric Co. pay $1.6 billion as the penalty for causing a deadly 2010 gas-pipeline explosion in the San Francisco Bay Area. California Public Utilities Commission President Michael Picker proposed a fine that is $200 million higher than one recommended by administrative law judges last year. Picker’s proposal would require PG&E shareholders to pay $850 million that would go toward gas transmission safety improvements.