So... the reason I say that...
Let's say that they're wanting to generate about 75 MW to make the 75% of the demand. Wind generators are good for about 1 - 1.5 MW currently. Therefore you need 50 windmills built. Ok, but... their availability is 15% of the time. 18% if you're lucky. So worst case scenario, to have 75% generation, 100% of the time, you need around 334 windmills.
Let's say that they're wanting to generate about 75 MW to make the 75% of the demand. Wind generators are good for about 1 - 1.5 MW currently. Therefore you need 50 windmills built. Ok, but... their availability is 15% of the time. 18% if you're lucky. So worst case scenario, to have 75% generation, 100% of the time, you need around 334 windmills.