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Challenges and solutions In the first part of the book , Sovacool explores the problems with the current system of large-scale electricity generation being used in the United States , powered by fossil fuel s and nuclear power reactors .
 person: Sovacool
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Sovacool 
Answer:
 person: Sovacool