Quote:
Originally Posted by euromodder
Audi is starting to store excess wind energy as synthetic CNG, which in turn is fed into the gas grid to power their CNG cars ...
Our imagination rather than physics limits the ways in which we can store renewable energy.
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The efficiency of any storage solution is of course of primary concern, and is limited by physics. Not sure "synthetic CNG" is all that efficient, though I have not looked into it.
But for electrical purposes research is being done on wood based sodium ion batteries. They lack the energy density of lithium but they are showing comparable charge/discharge efficiencies and may be suitable for power plants, someday.
Sodium-ion battery - Wikipedia, the free encyclopedia