It’s now clear that we have the technology we need to run a completely decarbonized electricity generation system. South Australia is the world leader[1] generating more than 50 per cent of its energy from renewable sources, and aiming for 100 per cent renewables by 2030.
The unit cost of renewables is now well below that of carbon-based generation (and nuclear). The remaining big question regarding the economics of the transition is the cost of storage, taking account of the variable nature of solar PV and wind.
As I’ve pointed out before, any reversible process that uses energy is a potential storage technology – that’s true of batteries, pumped hydro, flywheels, stored heat and many more. But hydrogen is a particularly appealing storage technology, because it offers the potential to decarbonize major industrial processes.
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