What is the Auto Power-Down feature on my Wii U?
What is Auto Power-Down?
The Auto-Power Down feature on your Wii U allows you to control how long your Wii U will wait before switching off if it is left in an idle state.
How to turn Auto Power-Down on or off
To turn the Auto Power-Down feature on or off, select System Settings from the Wii U Menu.
Next, scroll through the menu using the Left Stick until you reach Auto Power-Down.
From there, select Use or Don’t Use.