Very interesting article. But music has "bass" notes, not "base" notes. (Although as the father of ten year old who makes me listen to her favorite radio station in the car, there is a lot of "base" music out there these days.)
Hate to be a pill, but I strongly believe that these types of copy errors in a published article detract from the otherwise worthwhile points that are being made.
For every 100 MW of wind generation, 85 MW of backup fossil power is required. In Texas, the figure is > 90 percent backup.