And remember Manitoba hydro and Tennessee Valley Authority are involved as well. http://www.torontosun.com/2011/08/24/hydro-plugging-in-old-batteries-for-solar-storage There has been alot of research and work done on this system. Google "Manitoba Hydro Electrovaya" and click on "Presentation Slides" for info on Manitoba hydro's involvement. https://www.linkedin.com/in/shams-tabriz-a8730088 and https://ca.linkedin.com/in/inderjeet-duggal-07915a50 and https://ca.linkedin.com/in/nfazal and http://magazine.appro.org/index.php?option=com_content&task=view&id=2000&Itemid=44 People think this is just a large battery but it is a very complicated project with many people involved, hopefully it will all pay off.