Anderson, G. and Bell, M. (2012). Lights Out: Impact of the August 2003 Power Outage on Mortality in New York, NY. Epidemiology. 23(2): 189-193.
The authors examined the effect of a large U.S. blackout (2003, New York) on mortality. They found a 122% increase in accidental deaths, a 25% increase in non-accidental deaths, but their estimates of mortality risk exceeded actual reported mortality.