I paid $16K for my system and my utility paid $10K so the total system with installation was $26K. I will also get a $2K Fed.tax credit. The company I used had a licensed electrical and structural engineer, so I feel confident I won’t have problems in the future.

I will add to my system in a few years when we get either plug in hybrids or electric cars. I will need to see what my usage will be to get a system to fit my demand. I will also be able to get another rebate when I install the additional system.

Since I only have a few months I can’t say for sure what my savings will be. The proposal I received estimated I would be able to cut my usage by 33%, but so far I’ve seen about at 75% savings. I expect I will see it drop as the day light decreases, but I have much lower usage in the winter months as well. The proposal estimated a 6.5 year break even point. If that holds true and electric rates increase by 5% annually then I should save over $40K.
References :

There’s interrupted power when the wind dies down, but I live near to a coast, so it’s relatively uninterrupted.

The installation was pretty cheap, but the turbines themselves cost $15,000. In the future I would consider doing it myself, but it seems that that might be a bit tough.

I’m currently saving about $40/month on a bill of $300, so I would need to DIY in order to save money. I’m still looking into the feasibility of this.
References :
http://www.green-energy-reports.com