For the longest time, Nintendo has scored terribly on the Greenpeace Guide To Greener Electronics: dead last to be precise. Apparently this is because, according to Greenpeace itself, Nintendo has been extremely reluctant to release any information. But, in testing by Digital Foundry, it's been revealed that, in actual fact, the Wii U is remarkably efficient when it comes to energy consumption and is easily the greenest console on the market.
According to the testing the Wii U tends to draw a consistent 32W of power, even when processing the most image intensive games, whilst even the latest version of the PS3 tends to max out at 70W. The newest version of the 360 scored worst, drawing over 76W during gameplay. That's a significant difference.
These results are due to the efficiency of the Wii U's design, and the fact it uses less transistors compared to the competition.
In recent Iwata Asks, it has become apparent that Nintendo is focusing more on 'green' issues, and making their consoles as energy efficient as possible. The Wii U seems to be the end result of this. It's really interesting.
Roughly 18 months ago I spoke to Greenpeace about Nintendo's stubborn refusal to 'go green'. At that time a spokesperson challenged Nintendo to "focus on energy use, both in the manufacturing of the products, but also during the use phase". It seems as though Nintendo has done exactly that.
Wii U blitzes PS3 and 360 as the "greenest" console [GamesIndustry International]