Media playback is unsupported on your device

Spare energy capacity 'getting tight'

28 June 2013 Last updated at 12:34 BST

The government has dismissed a proposal that big shops and factories could be paid to cut their energy use to prevent shortages leading to blackouts.

The National Grid has suggested large consumers could be asked to lower use between 16:00 and 20:00 on weekdays in the winter.

However, the Energy Minister Michael Fallon insisted the lights would stay on.

Imperial College energy analyst Malcolm Grimston says that there is not a lot of spare energy capacity in the system and this could lead to problems.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.