From Yahoo Finance:
D = Dominion Power (blue)
POM = Pepco (red)
CEG = Baltimore Gas (Constellation Energy) (green)
Not as clear cut as I had hoped. In this post, the implications were the Dominion Power was the best peforming in terms of service reliability, followed by BGE and Pepco. It was also implied that Pepco’s poor service was a result of a lack of investment and cutbacks in infrastructure and maintenance and equipment replacement.