Are we aiming to low in our planned use of wind power?

So consider this:

In the US there are 106 Nuclear power stations which generate 100,000 Mw of electricity which is about 20% of total demand.

A wind turbine generates about 1.5 Mw per turbine. so to achieve 20% we only need 67,000 turbines.

Wind farms have a turbine density of 6 turbines/km^2

So I was looking at a wind density map:

http://en.wikipedia.org/wiki/File:United_States_Wind_Resources_and_Transmission_Lines_map.jpg

and the Great Lakes are rated a excellent to superb, but most are too deep to be practical locations.

But then there’s Lake Erie. It is has an average depth of only 19m and it is rated excellent. It has an area of about 25,000 km^2 so if you use just 30% of the area of the lake you’re gonna generate…

Let’s see:

5,000km^2 * 6= 30,000 turbines

30,000*1.5Mw=45,000 Mw

Just on Lake Erie alone! which is 9% of demand.

So I did the arithmetic in my head, did I like screw up a decimal place or something?

If I didn’t totally mess up the arithmetic what am I missing?

Are we aiming too low??