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ESO
Triads Data
On this page you will find all of the Triad data documents as well as links to guidance materials.
What are Triads?
Triads are the three half-hour settlement periods with highest system demand. We use them to determine charges for demand customers with half-hour metering and payments to licence-exempt distributed generation.
Want to know more?
Take a look at our guidance on triads.
Note: Indicative Triads are based on data received to date can be found on Elexon's Electricity Data Summary.
Triad data 2014-2021
Here is the Triad data for 2014-2021.
Triad data pre-2014
Here is the Triads data pre-2014
Transmission Network Use of System (TNUoS)
Transmission Network Use of System (TNUoS) charges recover the cost of installing and maintaining the transmission system in England, Wales, Scotland and Offshore.