The three Triad periods - the half-hours of highest system demand - for winter 2017/18 have been confirmed by National Grid.

Maximum demand was recorded on December 11 (48.582GW), February 5 (47.099GW) and February 26 (47.123GW). February 26 represents the latest Triad period ever recorded and was due to the extreme cold weather seen.

This winter was the first time since 2000 that all three periods of peak demand have been below 50GW.

All three Triad periods fell on a Monday which is also the first time since the scheme began.

Managing spikes in demand

SmartestEnergy, which provides a Triad alerting service for customers, correctly called all three Triad periods, with two called as ‘very likely’ and one as ‘likely’.

The Triad system is in place to help manage spikes in demand by encouraging large industrial and commercial energy users to reduce consumption.

These consumers pay a charge based on their location and their electricity use over the three Triad periods each winter which are the half-hours of highest system demand.

The Triad periods, which are between November and February and each have to be separated by at least 10 clear days, are not known in advance which means major energy users must try and avoid all potential peak periods which has the effect of reducing demand throughout winter.

> Find out more here