296671
The service was the first of its kind in Europe and in theory could save the UK £ 1.7 billion in energy costs over the next three years if all households in Britain were to adopt it .
 location: Europe
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Europe 
Answer:
 location: Europe