Question: what are the three effects of power blackout on a major city or town? 

Answer: Remember a couple years ago when power went out all across the northeast? I will never forget the photograph of the pedestrians walking across the bridge in New York City. There was no public transportation; the subway was out.\n\nWe could not cook because we have just electric stove and microwave. No restaurants were open. All of the businesses had to close. Definitely a major loss of income that day. \n\nThere is always increased crime. It is dark; no one can see them and alarms systems likely do not work. Video cameras arent taping them. They can loot or do whatever they want.\n\nIf it is very cold then you have the elderly to be concerned about. They freeze without the heat. If it is very hot; same thing. They swelter without fans or air conditioning.
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