Pacific Gas and Electric Company has completed restoration of electric service to thousands of customers impacted by the Glass Fire in Napa and Sonoma counties, PG&E said Monday.

” … All remaining power customers who were impacted by the Glass Fire, and who can receive it, now have electric service,” PG&E Spokeswoman Deanna Contreras said, noting that PG&E thanks its customers, “who are our neighbors, friends and co-workers, for their patience during this time.”

At the height of the electric impacts, 28,000 customers in both counties were without power. Within one week of the start of the Glass Fire Sept. 27 near St. Helena, PG&E restored power to all but 4,550 affected customers, Contreras said.

“More than 800 PG&E employees, staff and contract crews responded, alongside first responders, to restore gas and electric service to thousands of customers after the Glass Fire damaged PG&E infrastructure in the two counties,” Contreras said.

The 67,484-acre Glass Fire took a heavy toll. In Napa County, nearly 350 commercial structures including wineries were destroyed, while 32 businesses were damaged. More than 300 single-family homes were destroyed and 77 were damaged in Napa County. In Sonoma County, 334 single-family homes were destroyed — mostly in unincorporated areas — by the Glass Fire and 80 were damaged, while four multi-unit residences were destroyed and four damaged.

The cause of the Glass Fire remains under investigation, according to Cal Fire.

PG&E said Monday that because service restoration has ended, it will started de-mobilizing its microsites in St. Helena and Kenwood that were used as Glass Fire staging areas for more than 1,800 power poles, transformers, crossarms, dozens of spools of conductor and other electrical equipment.

“When transmission sources, as well as other facilities, were impacted by the fire, we were able to keep the lights on for about 1,500 homes and businesses using mobile generators interconnected at our temporary microgrid generation site in Calistoga,” Contreras said. “We also interconnected temporary generation to our microgrid site in Angwin. We expanded the microgrid’s capabilities to incorporate additional customers.”

PG&E also used generators at the Calistoga substation on state Highway 29 to power additional customers in Calistoga who are not covered by the microgrid during times of fire restoration.

The goal is to bring those 2,600 customers back onto the grid by the end of the day Saturday, Contreras said. PG&E will notify affected customers about a planned power outage, the date of which could change if weather conditions are unfavorable, she said.