A conservative watchdog group is suing the Energy Department for documents related to its $529 million loan to electric-vehicle maker Fisker Automotive.

Judicial Watch said Wednesday that it filed the lawsuit after the Energy Department failed to provide documents in response to a November Freedom of Information Act request.

“It looks like the Obama administration has another Solyndra mess on its hands, which is why they’re stonewalling the release of records regarding this shady Fisker deal,” Judicial Watch President Tom Fitton said in a statement. “Once again the Obama administration shelled out over half-a-billion dollars to a failing and incompetent green energy company.”