Last week's poll: electricity storage in the UK

We had a strong but confusing response to last week's poll on energy storage. With 518 readers contributing to the poll, it was one of the most popular we have held. However, the largest group of respondents, 34%, declined to pick one of the options.

This does not happen very often, and it's difficult to draw conclusions from it. However, from the extremely lively discussion in the comments section - 64 comments when the poll was closed - it seems that at least some readers picked "none of the above" because they thought that no single option would be best for the UK, but rather that a mixture of different technologies was the best way forward.

Of the other options we presented, banks of lithium-ion batteries were the most popular, with 21% of the vote. Cryogenic energy storage came second with 18%, and molten salt storage third on 14%. Energy storage based on flywheels gathered 10% of the votes, while pressurised air bags were the least popular on 2%.