Even with good safety procedures and legislation, we still get the storage of flammable liquids catastrophically wrong occasionally: http://www.earthquakes.bgs.

Even with good safety procedures and legislation, we still get the storage of flammable liquids catastrophically wrong occasionally: http://www.earthquakes.bgs.ac.uk/research/events/buncefield_explosion.html http://www.earthquakes.bgs.ac.uk/research/events/buncefield_... LiIon batteries may burn occasionally, but at least for grid storage the effects are localized and tend not to be explosive.