BALTIMORE (AP) — The head of Maryland’s Public Service Commission said Thursday all of Maryland’s major electrical utilities will have to file reports on how they managed power restoration in the aftermath of the strong storm that tore through Maryland late last week, knocking out power to more than 1 million Maryland customers.

While regulators are now focused on restoration efforts, Doug Nazarian, the PSC chairman, said Maryland utilities will have to file the major storm reports 21 days after power is restored. Major storm reports are required when a storm affects 10 percent of a utility’s service area or 100,000 customers — whichever is less, Nazarian said.