Between the political bickering following a spate of blackouts in South Australia and the billionaire entrepreneur Elon Musk tweeting that he had a fix, and then the South Australian government announcing that it will build a grid-connected battery storage facility, interest in renewable energy storage has never been higher.
While lithium ion batteries sold by Tesla and others are perhaps the most widely known storage technology, several other energy storage options are either already on the market, or are fast making their way there.
All are hoping to claim a slice of what, by all indications, will be a very large pie. The Australian Energy Market Operator forecasts that more than 1.1m new battery storage systems will be installed in Australian households by 2035. And, according to a 2015 report by the Climate Council, battery storage capacity is expected to grow 50-fold in under a decade.
“The market for storage is huge,” says Kevin Moriarty, the executive chairman of 1414 Degrees, an Adelaide-based thermal storage company hoping to win South Australia’s 100MW storage system tender. The South Australian system will be the largest in Australia so far but Moriarty describes it as “a drop in the ocean” compared with what will be needed as Australia transitions away from carbon-dioxide emitting fossil fuels.
The need for energy storage solutions is the natural consequence of an energy grid that has an increasing amount of renewable energy sources. Solar powerplants don’t produce energy when the sun doesn’t shine and windfarms grind to a halt when the wind doesn’t blow.
At the grid level, the resulting fluctuations in supply, combined with demand that can rapidly spike during hot weather, for example, can play havoc with the steady 50Hz electricity supply needed to power everything from microwaves to factory production lines.
Traditionally, fossil fuel-powered turbines are used to rapidly respond to load changes. If switched on when needed, electricity output ramps up or down so that there is enough electricity, at the right frequency, to supply demand.
Renewable energy storage systems, which include batteries and thermal storage systems, run from small household units to power plant and grid-scale technologies. What they aim to do is enable electricity to be released into the system when it is needed – so-called load shifting – rather than only when solar collectors or wind turbines are operating.
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