That's for the entire global energy production (and then some), including transport, heating, industry, not just electricity.
10% of land is set aside for agriculture, which is about 1/3 of 10% of water, but gives an indication. That's an area far larger than the entire US (including Alaska). We use a lot of space.
But you wouldn't produce your entire output from wind. In a desert you get about 2kwh per day from solar per square metre, or 2gwh per square km, or 100,000 SQkm of land for solar.
That's under half the size of Arizona's desert, or 1% of Sahara.
On land, it's the area of Russia, Canada and the US, completely covered with wind farms.