Dont worry, Nitrogen will get a bit more complex next time. Compressing Air -> Turbines is also very Fun, but you only get 200EU per Cell, so it's worse than a Watermill with 500EU (and since its made of 2 Windmills its even more expensive), I will maybe use Air as an amplifier for Gas Turbines and Diesel Generators.
But remember that you're getting the equivalent of 16 watermills from one turbine, AND you don't have to worry about dealing with buckets.
Its use as an amplifier sounds much more appropriate, certainly, and I'm looking forward to both that and the complexities you have planned for nitrogen.