A power failure caused by damage to transmission equipment from the Edgewood Fire in San Mateo County prompted Stanford University to cancel classes on Wednesday, June 22, according to the university.

Stanford sent out an alert on Tuesday afternoon, announcing that one of PG&E's main transmission lines feeding the campus was reportedly down. Efforts were underway to try to transfer power to an alternate line, according to AlertSU, the university's emergency alert system.

The university later announced it was canceling summer session classes, conferences and day camps. Madera Grove, Children's Center of the Stanford Community and Stock Farm Road child care facilities are also closed due to the continued outage.

Cellular service also was affected in some parts of campus and the university distributed flashlights to student residences that are without generator power.

Employees who work on the main Stanford campus were being encouraged to work from home. Operations at Stanford Redwood City, SLAC National Accelerator Laboratory and the Stanford Research Park was not affected by the outage.

PG&E had not provided an estimated time of power restoration, the university said Tuesday night.

The fire that caused the power failure broke out on Tuesday afternoon in an area near Emerald Hills in Woodside and as of Tuesday night had spread to 25 acres, Cal Fire officials said in a press conference. On Wednesday morning, Cal Fire reduced the acreage count to 20.

Some power was restored to cooling equipment for Stanford Hospital and other critical infrastructure, the university said on Tuesday evening. Health care services had not been impacted by the outage, according to Stanford's IT department.

On Tuesday, the university set up respite locations for food and access to power on campus and moved portable light stations into some student areas to provide outdoor lighting. Parking garages were closed due to dark conditions.