Here's what PECO's Benjamin Armstrong had to say about power outages in Ardmore:

Mr. Muth is correct in his history of outages impacting the Ardmore area since 2010.  While we strive to provide our customers with reliable electric service 100 percent of the time, issues can occur that prevent us from achieving that goal.  On average, customers across the PECO system lost electric service less than once in 2011 and once in 2010 – and the company is consistently recognized for its electric system performance.  

On the circuit that provides electricity to customers in Ardmore, there have been four issues that have impacted service since January 1, 2010.  On February 23, 2010, customers lost service due to an issue with an underground cable along Montgomery Avenue.  On August 18, 2011 an outage occurred due to a lightning strike that damaged equipment at Montgomery Avenue and Church Road.  On January 30, 2012 an outage occurred due to an issue with equipment at Wynnewood substation, which is located on East Wynnewood Road.  Last night’s outage occurred due to an issue with an underground cable on Montgomery Avenue.

We realize that any disruption of your electric service can be inconvenient and we apologize for any issues caused by this interruption. We continually monitor our electric system performance to identify opportunities to improve service for our customers.

Here's what brought the whole matter up, a post Tuesday morning by webmaster Doug Muth on the Save Ardmore Coalition site:

“Once again, we were hit with yet another blackout on Montgomery Avenue in Ardmore. It was the exact same zone as depicted in this blog post (in the past), and constitutes the fourth significant power outage since 2010.
The outage zone stretched roughly from 240 W. Montgomery Avenue to the intersection with Anderson Avenue, including the west parking lot at Suburban Square (and the YMCA property). The outage lasted about 75 minutes, from 11:45 p.m. until 1 a.m.
I hung out on Montgomery Ave, hoping to ask PECO employees about what caused the blackout and what the ETA (for restoration of power) was.
Unfortunately, I didn't get the opportunity to speak to any employees, as they kept driving around, presumably checking different pieces of equipment. I observed one employee using a long pole to disconnect 3 relays at the northwest corner of Montgomery and Woodside Avenue.
He then drove west about a block, and restored power to that section. He drove east to Anderson Avenue, and power was restored to the nearby block of West Montgomery about 10 minutes later.
I waited a little longer at Woodside Avenue to see if he would come and reconnect the relays, but I got cold and decided to go back inside.
I still have no idea what is causing these persistent outages, or why only these two blocks were affected.”