Wind energy technology has advanced so much in recent decades that a handful of larger, more efficient turbines can now do the same job as hundreds of smaller turbines, allowing utilities to squeeze more electricity out of the same area of land.

That means that many owners of wind farms built during the California wind rush of the 1980s are starting to upgrade their equipment — and in the process, they are expected to send thousands of worn-out, old machines to the scrap heap over the next five to 10 years. Read More