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A similar crisis , although not escalating to the point of military threats , occurred in 1981 when the Keban Dam reservoir had to be refilled after it had been almost emptied to temporarily increase Turkey 's hydroelectricity production .
 Keban Dam, Turkey
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Keban Dam, Turkey