69005
The largest system is the city of Ptolemaida , where there are five power plants ( thermal power stations or TPS in particular ) providing heat to the majority of the largest towns and cities of the area and some villages .
 Ptolemaida
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Ptolemaida