You can even use power adapters from other consoles with the Steam Deck. For example, the Nintendo Switch charger is rated for 39W/15V/2.6A, which makes it handy in a pinch.
Each is proficient at directing a lot of power to a single device, as well as spreading it out across several at the same time, like a phone, a set of wireless headphones, and a Nintendo Switch. We expect even more options to come as 2019 proceeds, but the first batch of big, ...