Great Britain's National Electricity Transmission System (NETS) must continue to adapt and be developed so power can be transported from source to demand, reliably and efficiently.

The results on this page will be used in the NOA 2021/22 to present an assessment of the ESO’s recommended reinforcement options to address the potential future NETS boundary needs.

Discover more about ETYS

ETYS and the Network Planning Process

Learn about how we prepare the ETYS and how it fits with our network planning process.

Electricity transmission network requirements

You can discover more out about the various regions of the transmission system and their capabilities.

Way forward

Read how we are going to improve the ETYS and how you can get involved.

ETYS documents

Get to the appendices, glossary and other helpful contact information.