About 11,500 homes in El Cerrito, Albany and Berkeley were with no power last evening after Mylar balloons drifted into power lines, Pacific Gas & Electric officials stated.

The outages were first accounted about 7 p.m. and were ongoing at 9 p.m., with two locations in El Cerrito recognized as the sources.

The metallic balloons are popular as graduation balloons in season and outdoor celebrations could also cause surges and short circuits in the power lines.