I know nothing about Dominion. They seem to be a minor player in this game. I suspect the deal has been stuck a while ago, but they probably had to allow them to bid to present the perception of a public bidding process. From what I can see, Dominion made a token effort to stop the deal, but had no chance.
Soros has been pushing this deal, but the details are muddled. Cap and Trade has his fingerprints all over it.
The Rahm Emanuel Connection to the Deceased Ashley Turton
http://www.economicpolicyjournal.com/2011/01/rahm-emanuel-connection-to-death-of.html