Bloomberg News, Mar. 30, 2017, by Chris Martin.
https://www.bloomberg.com/news/articles/2017-03-30/a-buzzkill-for-utilities-high-on-hope-for-legal-weed-power-surge

"With local restrictions on marijuana easing across the U.S., power suppliers from California to Maine were expecting a little buzz of their own from newly legitimate pot farmers. After all, a 5,000-square-foot warehouse filled with hydroponic growing systems can draw five times the electricity of a typical industrial user. But after an initial jolt in electricity use, when western states began legalizing marijuana cultivation and sales, demand has fallen off in some areas, according to utilities and analysts."