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Summary
The city energy company Helen is building hot-water storage into man-made caves.
Helsinki, Finland , Dec. 19, 2018 (GLOBE NEWSWIRE) -- Former fuel-oil storage caves in the Helsinki bedrock will store hot water heated in the processes of the Helsinki energy company Helen, to be used for district heating from 2021 onwards. The hot-water lakes will be the newest energy storage facility in Helsinki and complement underground cold-water lakes used to cool the city.
The man-made caves, now being converted from oil to water storage, are located in the Mustikkamaa recreational island of Helsinki. The caves will be filled with 260,000m3(70 million gallons) of domestic water, which will be kept at maximum 90 °C (194 °F) through a district heating connection from Helen’s heat production processes to the island.
The heat stored in the water will be released into the district heating network with heat exchangers. The full energy storage capacity of the caves – 120 MW – will be enough to provide for half of Helsinki’s summer-time district heat consumption (hot domestic water) for 4 days. It can be used in winter to ease peak demand, which would otherwise necessitate extra generation in coal- and oil-fired processes.
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