Liquid air energy storage: Highview’s 5 MW pre-commercial demonstrator [credit: ModernPowerSystems]
Under the heading ‘Cool air technology for a cooler planet’, the firm behind the scheme says:
‘Our CRYOBattery can deliver anywhere from 20 MW/80 MWh to more than 200 MW/1.2 GWh of energy and can power up to 200,000 homes for a whole day. We do this at half the cost of lithium-ion batteries and release zero emissions in the process.’
The system is intended to run on surplus night-time output from wind farms, but as ever, converting electricity to some form of storage and then back to electricity again is adding yet more costs and complexity to the system.
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Work is beginning on what is thought to be the world’s first major plant to store energy in the form of liquid air, reports BBC News.
It will use surplus electricity from wind farms at night to compress air so hard that it becomes a liquid at -196 Celsius.
Then when there is a peak in demand in a day or a month, the liquid air will be warmed so it expands.
The resulting rush of air will drive a turbine to make electricity, which can be sold back to the grid.
The 50MW facility near Manchester will store enough power for roughly 50,000 homes.
The system was devised by Peter Dearman, a self-taught backyard inventor from Hertfordshire, and it has been taken to commercial scale with a £10m grant from the UK government.
“It’s very exciting,” he told BBC News. “We need many different forms of energy storage – and I’m confident liquid air will be one of them.”
Mr Dearman said his invention was 60-70% efficient, depending how it is used.
That is less efficient than batteries, but he said the advantage of liquid air is the low cost of the storage tanks – so it can easily be scaled up.
via Tallbloke’s Talkshop
November 7, 2020 at 04:18AM