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Active project developers grew to include Ausra , Mulk Enpar Renewable Energy , Bright Source Energy , eSolar , FPL Energy , Infinia , Sopogy , and Stirling Energy Systems in the USA .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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