Espero te ayude. saludos!

Mañana, cortes rotativos de energía en toda la provincia
www.territoriodigital.com/notaimpresa.aspx?c=23920927428031...‎
hace 3 días – La empresa Electricidad de Misiones Sociedad Anónima (Emsa), ... interrupciones de energía eléctrica en la provincia en forma rotativa con ...

my porpuesta

http://tesis.ipn.mx:8080/dspace/bitstream/123456789/5279/1/I...
Un bajo voltaje es un decremento en el voltaje (…)

http://en.wikipedia.org/wiki/Power_outage
Power outages are categorized into three different phenomena, relating to the duration and effect of the outage:
A transient fault is a momentary (a few seconds) loss of power typically caused by a temporary fault on a power line. Power is automatically restored once the fault is cleared.
A brownout or sag is a drop in voltage in an electrical power supply. The term brownout comes from the dimming experienced by lighting when the voltage sags. Brownouts can cause poor performance of equipment or even incorrect operation.
A blackout refers to the total loss of power to an area and is the most severe form of power outage that can occur. Blackouts which result from or result in power stations tripping are particularly difficult to recover from quickly. Outages may last from a few minutes to a few weeks depending on the nature of the blackout and the configuration of the electrical network.



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Note added at 6 hrs (2013-05-21 10:34:34 GMT)
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El “brownout” es una de las tres incidencias típicas que puede sufrir el suministro de corriente eléctrica. Creo que “caída de la tensión eléctrica” es la traducción más apropiada. En términos más coloquiales, también se lo denomina “apagón”, aunque me convence menos.