The biggest risk is with partial or full repowering. Wind turbines are mechanical and often need to be repowered after 8 - 15 years.
Many wind power agreements do not account for inflation (or cap inflation). The wind royalties will be worth less over time.
Additional nerby wind development may introduce wake effects, reducing the turbine production and potentially cause it to be moved or removed.
Wind agreements usually favor the developer/operator and can often be canceled by the operator at anytime. There may not be a guarantee of future revenue.
Incentives are sometimes tied to new projects, so wind developers often prefer to develop a new "greenfield" rather than extend the term of a current wind farm.
The political climate can encourage or discourage wind development and either can have a negative impact on your wind compensation.
I'm getting older. I don't really have 25 years to wait and collect payments. I'd rather have the money now. My kids are going to sell the land when I die anyway. M. Martinez
I am on a fixed income and my home needs work. I choose to sell for a lump sum and live in a totally remodeled house. If I have to look at and hear these darn turbines, I may as well buy sound-resistant windows!R. Dimmit
My wind turbines have been producing for a few years now. I don't mind them really, but I'm thinking about selling my land. I'll get more money by selling the wind royalties separately. K. Birch
I sold my wind royalties in order to buy more land and expand my farm. I now own three times as much land. And guess what? Another company is fixing to put a turbine on my new land!K. Birch