UK Prius PHV Fleet Ready for Deployment

Well, looky there. A fleet of Prius PHVs ready to take over the UK. Scott Brownlee with Toyota UK's PR department posted this photo on Twitter earlier today. Along with the photo, Scott asked:

So, what should the collective noun for plug-in Prius be? A "grid", maybe

Source: Twitpic via ToyotaPR (Twitter)