126667
Background and construction At the end of the 1940s , the Puerto Rico Aqueducts and Sewers Authority proposed the construction of a dam at the Río Grande de Loíza in the Barrio Carraízo of Trujillo Alto with the intention of providing both water and electricity to the San Juan Metropolitan Area .
 San Juan Metropolitan Area
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 San Juan Metropolitan Area