Japan has a total installed district heating capacity of 4,241 MWth as of 2013, which includes a total of 79 district heating systems, and this has remained fairly stable following previous years. As a result, district heating sales to customers have equally remained stable. Services and other demand constitute the majority of heating sales in Japan, whereas the residential sector plays a minor role.
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Useful links:
Japan Heat Supply Business Association (JHSBA)