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

To ask the Secretary of State for Energy and Climate Change, whether she has made an assessment of the potential effect on UK GDP of the National Grid issuing Notification of Inadequate System Margin notices; and if she will make a statement.

A NISM is a notification issued to the electricity market to ask power stations to make more generation available for a short, specified, period of time. It doesn't mean demand is about to outstrip supply, only that National Grid would like a larger cushion of spare capacity in the short term.

DECC has not made an assessment of the impact of NISMS on GDP. There have been 2 NISMs since 2010 and these have only lasted a few hours on each occasion and have had virtually no impact on consumer bills.