The California utility that operated a gas pipeline that blew up in San Bruno plans to test two nearby transmission lines to make sure they are running at safe pressures.

After the deadly explosion in San Bruno on Sept. 9, state regulators ordered Pacific Gas & Electric Co. to produce records for its pipelines through urban areas or test them.

Federal investigators have not determined a cause but suspect the pipeline may have burst under high pressure.

PG&E said Tuesday pipeline segments in Mountain View and Antioch will get the first hydrostatic pressure tests starting in May. Those segments will be out of service for a few days, but PG&E will provide gas to customers from another source.