Hospitals usually have their own electrical generators which take over in the event that mains power is lost.
m
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a blackout
The Blackout Files - 2009 was released on: USA: 15 May 2009 (internet)
Back up generators
The body may shut itself down through course of blackout when threatened or shocked. Its a self defense mechanism.
Hospital Hustle happened in 2009.
Theme Hospital happened in 1997.
Hospital Tycoon happened in 2007.
MatthewDieuAllen TV - 2008 Blackout - 1.8 was released on: USA: 7 May 2009
That would be very unlikely to happen and is in the realms of pure fantasy.
Blackout Roulette - 2010 was released on: USA: May 2010 USA: 31 March 2012 (Phoenix Film Festival)