A partial power outage affected several buildings on Stanford’s main campus on Tuesday morning, according to an AlertSU notification. The source of the outage was identified as a power line within the University’s power infrastructure. The line provides power to the Green Library East Wing and the Coupa Cafe location adjacent to the library.

Power was restored in the afternoon to most other buildings affected, except Green Library East Wing and the Coupa Cafe, according to the latest update. Earlier in the day, 39 buildings were without power, four of which the University decided to temporarily close.

The first Alert SU was issued at 6:54 a.m., notifying students of the partial outage. An update at 10:59 a.m stated that the outage was due to a malfunction within campus infrastructure, unlike the recent PG&E outage in June when the Edgewood Park fire caused a PG&E system failure and a two-day power outage across campus​​.

Buildings initially affected by the outage included the Knight Building, Arrillaga Alumni Center, Fire & Police buildings, and Arrillaga Gym & Weight Room, among others. No student residences lost power. The University provided a map showing all of the locations affected by the outage.

There is no estimated time when power will be restored to the Green Library East Wing and adjacent cafe.

University spokesperson Luisa Rapport wrote that the cause of the outage is “under investigation,” in an email to The Daily.

“Any additional work or changes to the power system would depend on the cause of determination,” Rapport wrote. “Campus safety is a priority for university staff and is the first consideration, whether repairing, investigation or improving the power system.”