http://www.ryerson.ca/cue/news/blog/next-big-thing-campus-toronto-hydro-pilots-large-scale-energy-storage-system/

Is it environmentally-friendly?
The battery is non-toxic and produces zero emissions. Conventionally, lithium-ion batteries are manufactured with NMP, a toxic chemical that has shown to cause negative effects on human health. The lithium-ion SuperPolymer®2.0 batteries are manufactured by Mississauga-based Electrovaya, the only major lithium-ion battery manufacturer in the world that avoids using NMP.

This raises questions about whether they are now making non-NMP batteries. This article states they are. Other information suggests they're in the process of just building the production lines. Confusing to say the least.