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1. Introduction to the ETYS
ETYS 2020

1. Introduction to the ETYS

The ETYS is our annual view of what the transmission requirements and capability of Great Britain's NETS are over the next decade. 

It's key in helping us to understand what investment and development is needed to help us achieve our zero-carbon ambition.

Here is an overview of the planning process:

Future Energy Scenarios (FES) – every July

The Future Energy Scenarios tell us a range of credible pathways for the future of energy from today to 2050.

Electricity Ten Year Statement (EYTS) – every November

The ETYS informs the likely future transmission requirements on the electricity system.

Network Options Assessment (NOA) – every January

The options available to meet reinforcement requirements on the electricity system.

As per the NOA 2019/20, currently the outcome of the planning process of the next 10 years recommends:
This is worth over:
£203 Million
42 projects
£11 Billion

System needs in Europe

Like ETYS in Great Britain, the European Network of Transmission System Operators for Electricity or ENTSO-e also assess the network capability of the European grid.

European transmission developments can be found in the Ten Year Network Development Plan (TYNDP).

It's produced every two years, whereas the ETYS and NOA are produced annually, using a different set of energy scenarios and focuses mainly on pan-European projects that meet European Union objectives, such as cross-border trade and European environmental targets.

Find out more

The future for ETYS and the network planning process

This year, for the first time, a web version of the ETYS is available.

This interactive version of the ETYS will make it more accessible, clearer and easier than ever to read.

Let us know your thoughts so we can improve your experience.

Take the survey 

The Network Development Roadmap sets out our ambitious commitments to transform our network planning and deliver greater value for consumers.

We detailed how we are going to:

  • drive greater consumer value by considering a range of solutions from different providers, to identify the best ways to meet transmission network needs.
  • enhance our analytical capabilities to ensure we plan the right level of investment for an increasingly complex network.

Since the update to the Network Development Roadmap in January 2020, we have been providing further updates through the website and newsletters.

Click on the boxes below to see how we are building and improving on the ETYS in various areas:

License obligation

The ETYS and NOA, in line with our licence obligations, are part of our baseline delivery against these roles.

There are other commitments to transform our approach too throughout ESO. 

In our incentives framework, we publish an annual Forward Plan where we set out timeframes for delivering roadmap commitments.

We are still committed to facilitating whole system outcomes and supporting competition in networks. 

Year-round probabilistic analysis

The changing nature of the electricity system means it is increasingly important to study the transmission network needs beyond that of winter peak.

The level of uncertainty throughout a year of operation has increased due to a significant increase in intermittent renewables and interconnectors. 

This year we have improved our probabilistic analysis and optimised our post fault actions to include the use of Quadrature Boosters and other power control devices in our analysis.

We have summarised our results across a range of the GB network boundaries, and have identified the next steps for the analysis in chapter 4.

NOA Pathfinders

We are extending our network planning to address regional voltage and stability challenges through our NOA pathfinder projects.

We are taking the lessons learnt from them to help us identify further system needs and develop the tools and processes to assess voltage and stability challenges.

This is a part of our long-term planning. We have provided updates to the ongoing voltage year-round assessments in the North of England and Pennine regions in chapter 5

Our NOA stability pathfinder project is exploring the benefits and practicalities of applying a NOA-type approach to the operability aspects of system stability.

This is in response to the decline in transmission connected synchronous generation over the next decade. Further detail on our pathfinder projects is available on our Network Development Roadmap website.

We are also aiming to expand the NOA process to allow network and non-network solution providers across distribution and transmission to submit options to meet transmission network needs.

Our pathfinder projects will help ensure the right balance between operational and network investment solutions and will increase the value of ETYS and NOA for consumers. 

System Requirements Form (SRF)

We are taking steps to clearly communicate our analysis of the transmission network needs to new audiences. For the second year, we have made the System Requirements Form publicly available but we would welcome feedback on how this ETYS document and the way we set out transmission network needs can be more accessible. 

Improving your experience

We hope find the ETYS 2020 and our other ESO publications such as the NOA, FES and System Operability Framework (SOF) useful in your future decision-making.

We are keen to hear your views whether there are options to problems identified, feedback on the new format or views on our analysis. 

We have listened to our stakeholders and since the last publication we have aimed to describe transmission system needs more clearly and precisely.

We are using our ongoing pathfinder projects to explore how we can better communicate system needs such as voltage and stability. We will use learning from these projects to shape the ETYS in the future.

We know that we need to review our information and processes, including the System Requirements Form (SRF), to make them more accessible to a broader range of participants. We welcome your ideas and how we can improve this. 

We welcome any feedback you may have on this year’s document, as it will assist us in the development of future publications. Please feel free to share any views or ideas you may have with us via [email protected]

Jump to another section of the ETYS

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1. What is the ETYS?

Find out about the ETYS and how this fits with our entire planning process

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2. Network Development Inputs

Here is more information on how we prepare the ETYS

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3. Electricity Transmission System

You can find out about the various regions of the transmission system and their capabilities

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4. Year-round probabilistic analysis

You will find how we are applying year round conditions to assess the capability of the system

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5. Way forward

Find out about how we are going to improve the ETYS and how you can get involved

6. Further information and appendices

Get to the appendices, glossary and other helpful contact information

Get in touch

Email us

Email us to learn more or get involved in the EYTS


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