Twin Bumblebee Sighted20/06/2008
He said both cars looked identical so couldn't identify which was the "hero" car and which was a stunt car. It’s possible both are stunt cars or both are hero cars but more then likely one of each. If that is the case that indicates some stunt work was done at the site so it seems that like Bethlehem, the Power Plant is playing host to an action sequence.
Update: Three additional pictures from energonkid have been added below. The first is the lot entrance and in the far left you can see a little of the 'Bees. Next is the signage that lets you know if TF2 production is close by and last is a shot of the Paramount trucks.
Source: Transformers Live