Looking for more information about the 9 August power cut?

See our interim technical report and other ESO resources.

​Electricity Ten Year Statement (ETYS)

We publish the ETYS annually in our role as the electricity system operator. It's part of the annual electricity transmission planning cycle, and shows the likely future transmission requirements of bulk power transfer capability of the National Electricity Transmission System (NETS). This is based on the Future Energy Scenarios (FES), which help us capture a wide range of future network requirements.

Publishing System Requirements Form (SRF)

We want to increase participation in providing solutions for network development (see NOA Roadmap page). As part of this, we want to make our information and processes more transparent. We are therefore publishing our System Requirements Forms (SRFs). The SRFs present to Transmission Owners (TOs) the boundary required transfers for ETYS boundaries. These indicate where future network development may be required and are used by TOs to develop potential solutions. Our ETYS already provides a summary of this information. However, as a first step in our pathway to facilitate options from a broader range of participants, we are making the underlying data tables publicly available.

We recognise that we need to make sure our information is user-friendly for a broad range of potential solution providers. Therefore, we would welcome views on how useful you found the SRFs and how they could be enhanced. Please email any views or questions to [email protected]

About the 2018 ETYS

The ETYS is all about understanding what the requirements will be for the National Electricity Transmission System to transfer bulk power over the next decade – where future growing needs might occur – so that as the Electricity System Operator we can plan ahead to manage the network effectively and securely. The ETYS includes contributions from the GB transmission owners.

This year’s ETYS shows how we are improving our network development analysis and tools as part of our commitments in the ESO Forward plan. It presents the initial findings of two pathfinder projects, i.e., the regional voltage analysis and the year round thermal analysis. These findings highlight the importance of studying the future network requirements in conditions other than the winter peak.

Transmission developments and how they are assessed will now be published as part of the Network Options Assessment (NOA) report.

Past ETYS documents

System Requirements Form