If there’s one thing to be said about plug-in hybrid vehicle developer Fisker, it’s that the young startup moves quickly. A month after securing a $528.7 million loan from the Department of Energy, Fisker is reportedly in advanced talks to buy an old 3.2 million-square-foot General Motors assembly plant in Wilmington, Del., to build its low-cost, next-generation plug-in hybrid vehicle called Project Nina.

Fisker, which didn’t immediately respond to requests for comment, has repeatedly said that it would manufacture a cheaper and higher-volume plug-in than its $87,900 Karma, which is slated for delivery starting next summer, on the condition that it received the DOE loan. That loan came through, and the Irvine, Calif.-based startup, which was founded in 2007, appears to be moving on its promise. Based on previous comments by the company, Project Nina would sell for around $40,000 and be manufactured at a volume of 75,000-100,000 a year starting in 2012.

Buying a shuttered GM plant would seem to be a smart move. The plant, which according to the Wall Street Journ