'Fail safe' back-up system in D.C. hospital is more than just stand-by source for power.
D004219:District of Columbia; D004560:Electricity / Q000600:supply & distribution; D004630:Emergencies; D004865:Equipment and Supplies, Hospital; D006745:Hospital Bed Capacity, 300 to 499; D006776:Hospitals, Pediatric; D011210:Power Plants; D012914:Snow