Y! News
Summary
Work lights strung up along railings illuminate a dank cavern where workers are preparing to transform a former oil depot into a hot water "thermos" to heat a Swedish town.
Originally dug out in the early 1970s, the three caverns with a combined volume of 300,000 cubic metres served as an oil storage until the site was abandoned in 1985.
"We are now converting it into a giant thermos to store hot water in," explained project manager Rickard Svensson at power and district heating company Malarenergi in the city of Vasteras.
The site will "store energy, which we sometimes have an excess of, and ... use that at times when there is a shortage," he said.
The caverns are close to Malarenergi's combined heat and power plant, which supplies electricity and especially heat via district heating, to Vasteras' 130,000 or so inhabitants.
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