According to the Pepco website:
“Pepco, a subsidiary of Pepco Holdings, Inc., delivers safe, reliable and affordable electric service to more than 793,000 customers in Maryland and the District of Columbia.”
Regarding smart meters, according to documentation on the Pepco website:
“Do smart meters emit radio frequency (RF) signals continuously throughout the day?
No. The actual percent of time the smart meter is transmitting, especially in the initial years of operation, is very small, usually less than 1% which is equivalent to an average of less than 60 seconds cumulatively throughout the day. Smart meter communications are typically less than a second and under normal operations, take place every 4-6 hours.”
According to the following news broadcast of February 20, 2013, on WUSA, Channel 9, in Washington, D.C., the smart meters are emitting RF radiation much more frequently than every “4-6 hours.”
Smart Grid Awareness 