Source?
I'd bet you're confusing nameplate capacity with actual generation. (Take the total wind installed base nameplate rating and multiply by .26, the average capacity factor.) That is why capacity factor is such an important measure.
Now, compound that with the fact that historically, electric demand has grown around 2-3 percent per year, you just can't build wind farms fast enough to keep up with new demand.
If the country is now using 4 quads per year rather than 3 I have to recalculate. I'll check into it. Thanks.