Correction to: Nature Energy https://doi.org/10.1038/s41560-019-0412-4, published online 8 July 2019.

In the version of this Article originally published, the units of ‘Total electricity yield’ and ‘Potential electricity gain’ in Table 1 were incorrectly presented as GWh yr–1; they should have been TWh yr–1. These errors have now been corrected.