As the sun shone on millions of solar panels and unseasonable gusts turned thousands of turbine blades on 11th June, something remarkable happened to Britain's power grid.

For a brief period, a record 70% of the electricity for the UK's homes and businesses was low-carbon, as nuclear, solar and wind crowded out coal and even gas power stations. That afternoon was a glimpse into the future, of how energy provision will look in 13 years' time because of binding carbon targets.

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