Thirty people were evaluated for symptoms including vomiting and nausea, according to SoCal Edison. Long Beach police and fire personnel responded. A hazardous materials team responded to the scene to investigate.
Employees began noticing the fumes in the building just before noon Monday. Some reported feeling weak from nausea.
The building, located at 150 Elm Avenue, was evacuated during the investigation. Firefighters checked every level of the building and did not find the source of the fumes. The building was declared safe.
Employees were sent home for the day, according to the company, and the swing shift would be forwarded to other facilities.
Customer service calls from the center were being re-routed to other SCE service centers, the company said in a statement.
The odor was detected at about 10 a.m., and an evacuation was ordered at noon, according to the company. No other nearby buildings were affected.