"The storage system, installed in the Vatajankoski power plant, has an energy capacity of 10 mWh, but we're looking to scale up to a one gWh capacity."
To put that into perspective, the average UK home uses 12,000 kWh of heat per year, or 32.9 kWh per day. A sand battery with a one gWh capacity could provide heat to 30,417 UK homes every day, on average.
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Earth First! Newswire 
dailyfusion
Garry Rogers
2ndgreenrevolution
