Water Efficiency, Mar./Apr. 2014, by Penelope B. Grenoble.
http://www.waterefficiency.net/WE/Articles/New_Frontiers_in_Energy_Management_24639.aspx

"Energy management has become a matter of necessity in states like California, less enthusiastically embraced in states where energy costs are lower. But take a closer look, and you’ll discover that energy and operational efficiency go hand in hand—and that managing energy costs goes beyond simply equipping a pump with a variable speed drive."