[mrpopo]

Probably still would, if you interpolate this graph: https://www.rtings.com/images/power-consumption.png

Still, wouldn't recommend buying a huge TV. Jevons paradox and all.

[bzzzt]

Depends on the generation. I've got one of the last plasma's made (2013 model), it's a 42 inch panel and has a max consumption of 180W (only when at full brightness viewing a white screen).