High-impact Low-frequency threats to electric grids, by NERC June 2010
Solar Storm Long Term Grid Outage Emergency Management Table Top Exercise, NOAH, summary and press 2010
Geomagnetic storm study extract from National Academy of Sciences report by John Kappenman, May 2009.
"Making the Nation Safer", National Academy of Sciences, post 9/11 report emphasizing need for local power generation.