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US Energy Secretary , Bill Richardson has extended an emergency order to keep electricity flowing to California .
 US, California, Energy, US Energy Secretary, US Energy Secretary , Bill Richardson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 US, California, Energy, US Energy Secretary, US Energy Secretary , Bill Richardson