Irv Miller, Toyota's Group Vice President for Corporate Communications, recently responded to an email sent by the Yahoo Gridable Hybrids group. In it Miller makes clear Toyota's stance on the possibility of a plug-in Prius, which is to say there's not going to be one… at least directly from Toyota. Miller makes the point that, as everyone knows, an electric vehicle is only as clean as the source of the electricity it is using. If your part of the national grid is powered by coal your EV car might not be doing as much as you thought to reduce pollution. It's Toyota's position as well that batteries require further development to improve capacity, durability and cost, which Toyota doesn't expect to happen anytime soon. So for now you can pack up your extension cord and head on over to the nearest BP if you want to keep your Prius powered.