The Network Options Assessment (NOA) is our recommendation for which reinforcement projects should receive investment. These projects are major electricity transmission network reinforcements as defined in the NOA methodology.

Our latest NOA is different in format and content than previous years. That’s because the ESO needs to factor in outputs from the ongoing Offshore Transmission Network Review (OTNR), a project led by the Department for Business, Energy and Industrial Strategy.

This NOA aims to enable progress for the next six months, rather than a full year. It provides only the necessary recommendations for Transmission Owners (TOs) to make progress with projects.

Family riding through field on bikes with wind turbines in distance SP

Download the NOA publication

Download the latest NOA 2021/22 interactive report.

Read the NOA report

What NOA can and can't do

The NOA can…  
  • Recommend the most economic reinforcements for investment over the coming years, whether to build or alternative options, to meet bulk power transfer requirements as outlined by the ETYS. 

  • Recommend when investments should be made under the different scenarios set out in the FES to deliver an efficient, coordinated, and economic transmission system. 

  • Recommend whether the TOs should start, continue, delay, hold or stop reinforcement projects to make sure they are completed when they will deliver the most benefit to consumers.  

  • Indicate the optimum level of interconnection to other European electricity grids and necessary reinforcements.

The NOA can't…  
  • Provide recommendations for customer connections. The NOA only recommends the most economic reinforcement to resolve wider network issues.  

  • Insist that reinforcement options are carried out. We can only recommend based on our analysis. The TOs or other relevant parties are ultimately responsible for what, where and when they invest.  

  • Comment on the details of any specific option, such as how it could be planned or delivered. The TOs or other relevant parties decide how they implement their options.  

  • Evaluate the specific designs of any option, such as the choice of equipment, route, or environmental impacts. These decisions can only be made by the TOs or other relevant parties when options are at a more advanced stage. 

  • Assess network asset replacement projects which don’t increase network capability, or individual customer connections.  

  • Procure products or services. The NOA may highlight a need to explore options further, either through the NOA Pathfinder projects or further engagement.   

  • Provide a recommendation on options that offer no benefit to the boundaries we assess.

  • Forecast or recommend future interconnection levels. It indicates the optimum level of interconnection. 

Discover more about the NOA


Investment recommendations

The options that are analysed in the NOA fall mainly into two main groups, asset-based options and ESO-proposed options.


NOA for Interconnectors

NOA for Interconnectors (NOA IC) highlights the potential benefits of efficient levels of interconnection capacity between GB and other markets.

NOA methodology

As a result of stakeholder feedback, we’ve moved the methodology and other content from the publication to our website. This has made the NOA shorter and easier to access.

Family eating food with glowlines

Key documents

Have a look at our previous NOA reports, NOA methodologies, NOA Committee minutes and other relevant documents.

National Grid ESO - ENCC transparency roadmap - electric car on a road

Subscribe to our newsletter

Subscribe to our monthly newsletter to stay up to date with all of the latest news in Network Development, including NOA, ETYS and NOA Pathfinder projects.

Connect with NOA

Contact us if you have a question, want to share some insight or have feedback on any part of NOA.