Uploaded on 2014-11-25 by Johncolepdx

[1]: https://edxuploads.s3.amazonaws.com/14169567361594713.jpg Barely visible are small scale wind turbines atop an apartment building in Portland. While these turbines provide some energy into the grid they represent a miniscule percentage of the total building energy demand. It is likely that all urban areas will continue to rely on power provided from their hinterlands regardless of the nature of that power source (hydro,solar, nuclear or carbon based fuel).