FREDERICKSBURG — In a campaign of strange bedfellows, an environmental group and Attorney General Ken Cuccinelli are attacking a complex bonus system that pads the profits of Virginia’s two largest electric utilities.

The conservative Cuccinelli — the bete noire of liberals and Democrats — found common cause with the Chesapeake Climate Action Network when he issued a report blasting $1 billion in rate “adders” bestowed by the state’s renewable-energy law.