That is the way the current incentive, ecoENERGY for renewable power, works. It's not specifically for wind; it includes other technologies. But there is sometimes an advantage in targeting certain technologies if you want to try to spread them around geographically. That's what Germany has done. They've actually given higher incentives for where you have a lower wind regime, so it helps spread out the technologies so that not all of the development happens in one part of the country.
There can be advantages to targeting certain technologies if you want to make sure they're not all going to be concentrated in one area.