PG&E bills would rocket 50 percent higher if wildfire disasters caused by the embattled utility descend on northern or central California again, according to a report that’s being circulated in Sacramento ahead of a crucial announcement Friday by Gov. Gavin Newsom. An array of catastrophes loom if state officials fail to find a fix for California’s utility-caused wildfire woes, according to the report from Steven Weissman, a lecturer with UC Berkeley’s Goldman School of Public Policy. “Rates would skyrocket, on average by 50 percent in the first year, to keep up with new fires,” Weissman wrote in his report to the governor’s office. “It’s simple math.”