Power consupmtion is an old thread, Plasmas nowadays dont use so much power either. My panasonic 42" uses some 120W, while an LCD in this size also does around 100W. Not that big difference, like 5 years ago. Look for PDP ones, the panel technology is licensed from the Pioneer KURO's there.
BUT, and this is the big point. there is NO LCD on the market yet, wich could compete with the picture quality of a plasma, when you are watching TV/Films/Sport etc.
LCD was never meant do display moving picture, they just try to adapt it, where Plasma was always meant to watch movies on it. Moving objects will never be so smooth, flicker free, and artifact free on an LCD. And then, there are the colors. Not much to say, a calibrated plasma will eat any LCD for breakfast.
LED ist just a backlighting type for LCD's. And a budget EdgeLED is even worse than an old CCFL backlit LCD, in terms of picture quality. Full led, with local dimming is a good backlighting, but picture quality will never get to a plasma, even with this. And why would you buy a fullLED LCD at 2x-3x price, as a Plasma? Nonsense.