Rated at 335W. Actual consumption is a lot better than that but it strongly depends on use. If you watch a lot of dark movies, then it uses even less than a CRT. A Kill-a-Watt session averaged at about half the rated wattage.
The UI on our particular model is not exactly the friendliest I've ever encountered. Panasonic saw fit not to use the remote number pad for programming, so expect a lot of use of up/down left/right buttons to get things configured. And it does not retain the clock when main power is lost (more and more button presses required to reset until June, the year has to be selected on a dropdown.)