Correction to: Nature Energy https://doi.org/10.1038/s41560-021-00854-1, published online 3 June 2021.

In the version of this Comment originally published, the y-axis title in Fig. 1a was incorrect as ‘Carbon intensity of electricity (kgC GJ–1)’; it should have been ‘Carbon intensity of primary energy (kgC GJ–1)’. In addition, the text ‘RD&D’ has been changed to ‘research, development and demonstration’ in the caption and y-axes of Fig. 3. These errors have now been corrected.