Life cycle = 20 years
Wind Turbines = Non-Value Added
This does not include disposal cost for indestructible blade waste or the environmental impact of the the eyesore, noise, and bird kill.
Hey, it’s not my fault
This is all about the tax credits. Firm A constructs the windfarm and can take the tax credit for 5-7 years. Then Firm A sells windfarm to Firm B after 5-7 years when the credit has expired. Firm B now takes the tax credit for 5-7 years. Firm B then sells windfarm to Firm C and then takes the full tax credit.