Triads are the three half-hour periods of highest system demand between November and February each year, separated by at least ten clear days.

What does it mean for my business?

National Grid and its Scottish equivalents are paid a Transmission Network Use of System (TNUoS) fee in order to finance the cost of maintaining and upgrading the transmission network. This fee/benefit is variable for consumers dependent on line loss factors and which DNO (distribution network operator) you fall under.

Retail customers receiving pass-through charges pay their share based on consumption during Triads – sign up for our non-commodity costs quarterly webinars to keep up to date with forecasts for future Triad costs.

Embedded generators receive TNUoS as a benefit. This is because they generate power for consumption directly onto the distribution network, meaning the workload for the transmission network is reduced – sign up for our embedded benefits quarterly webinars to keep up to date with forecasts for future Triad benefits.

Our Triad services:

Our dedicated Energy Management Centre can alert you when a Triad is possible, so you can prepare and react accordingly – read how Saint-Gobain UK "powered down" to reduce Triad costs

Each warning comes with:

  • A likelihood scale to help you understand the possibility of it being one of the three triad periods;
  • Forecast of peak within day demand to compare to previous peaks in the same season;
  • Commentary to explain why the alert has been sent.
  • Contact your Account Manager to sign up to our Triad Alert email/text service

Winter 2018/19 results:

If you receive SmartestEnergy's Triad Warnings, you'll be pleased to know that all three Triads were predicted correctly. The three Triads all occurred on the following days:

  • 22nd November 2018 (45,280MWh GB demand)
  • 10th December 2018 (45,002MWh GB demand)
  • 23rd January 2019 (46,870MWh GB demand)

See the data

(Source: National Grid)