Question to the Department for Business, Energy and Industrial Strategy:

To ask Her Majesty's Government whether they have made any estimates of the potential cost savings that could be made by securing a greater supply of large scale, long duration electricity storage.

In 2016 the Government commissioned a study into the benefits of a smart, more flexible energy system, which found that the UK could save £17- 40 billion across the electricity system to 2050 by deploying flexible technologies. These include demand side response and a range of storage technologies. Long duration storage can provide additional security of supply benefits over those provided by short duration storage, and we have recently amended the Capacity Market rules to reflect this.