At least 5,000 PECO customers of the roughly 25,000 in Lower Merion and Narberth were without power Thursday afternoon and night, as an unseasonably warm day of presumably heavy air-conditioning use yielded to a windy evening thunderstorm.
About 5:30 p.m., Lower Merion had about 3,900 customers (of 22,700) without power, while Narberth had about 1,100 of 2,600 customers in the dark, according to PECO's online outage map.
By midnight, fewer than a dozen outages remained in Lower Merion and all service to Narberth was restored.
The outages hit many traffic lights in the township and borough, prompting complaints from Patch readers.
One posted on Facebook about 5:45 p.m., "Red lights out at Wynnewood and Lancaster and Wynnewood and Morris. Chaos. Avoid."
Another posted on Twitter about 5:50 p.m.: "Lights from Wynnewood to Bryn Mawr on Lancaster Ave are out. Epic disaster. Stay away!"