"What most people don't realize is that growing marijuana is a very intense power use," Roger Blank, the utility's director of safety, said in a statement [3]. Using older, less-efficient standard lights to grow four plants is akin to running 29 refrigerators, he said.
Links
[1] http://www.utilitydive.com/news/marijuana-grow-houses-trigger-7-summer-outages-for-pacific-power/408741/
[2] http://www.rethinkpot.org/tags/environment
[3] https://www.pacificpower.net/about/nr/nr2015/marijuana.html