SAN JOSE -- The Santa Clara County Communications Center experienced a power outage Wednesday night, causing 911 calls to be rerouted to San Jose police and fire dispatchers for about two hours, according to a county spokeswoman.

The outage happened at 10:30 p.m. and power was restored at about 12:45 a.m.

During the outage, county 911 dispatchers set up a command post in the center's parking lot on Communications Hill, Gwendolyn Mitchell said. . Emergency calls normally handled by the county, including the Santa Clara County Sheriff's Office, Santa Clara County Fire Department and Emergency Medical Services, were rerouted to San Jose dispatchers and then relayed to county crews.

The San Jose Fire Department, sheriff's office and EMS were also part of the command center.

County dispatchers used mobile radios to communicate with personnel in the field, Mitchell said.

It was not immediately known how many 911 calls were relayed to San Jose dispatchers.

The cause of the outage is still under investigation.

Contact Mark Gomez at 408-920-5869. Follow him at Twitter.com/markmgomez.