BY JOHN MATTHEWS, THE CONVERSATION

While wind and solar power have made great strides in recent years, with renewables now accounting for 22% of electric energy generated, the issue that has held them back has been their transience. The sun doesn’t shine at night and the wind doesn’t blow year-round — these are the mantras of all those opposed to the progress of renewables.

Now the renewable-power billionaire Elon Musk has just blown away that final defence. Last Thursday in California he introduced to the world his sleek new Powerwall — a wall-mounted energy-storage unit that can hold 10 kilowatt hours of electric energy, and deliver it at an average of 2 kilowatts, all for $3,500.
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