Power Engineering, April 18, 2017, by Rajan Chudgar and Dan Gabaldon.
http://www.power-eng.com/articles/print/volume-121/issue-4/features/what-you-need-to-know-about-energy-storage.html

"Common Misconceptions, How to Assess Options, Practical Operational Concerns, and Where's the value? There is a reason for the seemingly endless series of conferences and press releases on energy storage, and why the topic is near the top of the agenda for many energy and facility managers across the country. In the last three years, more energy storage has been deployed in the U.S. than the previous five years combined."