Network Options Assessment for Interconnectors (NOA IC) overview

The primary purpose of NOA for Interconnectors (NOA IC) is to provide a market and network assessment of the optimal level of interconnection capacity to GB. This is undertaken by evaluating the social economic welfare, that is the overall benefit to society of a particular option, as well as constraint costs and capital expenditure costs for the interconnector. To achieve this, NOA IC does not attempt to assess the viability of actual current or future projects: the final insights are largely independent of projects currently under development.

For NOA IC, the connecting European markets we will be considering will include Belgium, Denmark, France, Germany, Ireland (the combined market of Northern Ireland and the Republic of Ireland), The Netherlands and Norway. The main benefits of the potential further interconnection analysed will be consumer, producer and interconnector welfare benefit for GB and Europe, as well as the impact on constraint costs on the GB transmission system as well the capital expenditure of interconnectors. 

NOA IC also evaluates the environmental implications of increased interconnection, including the potential reduction in CO2 emissions and the potential reduction in the curtailment of renewable energy sources.

The points below highlight the iterative Interconnection Assessment Methodology process.

Run the model with each interconnector in sequence for each FES

Assess the net benefit of each potential interconnector study case for each FES

Update each FES path with the relevant optimal solution

For further detail see the ‘Network Options Assessment for Interconnectors’ Section 3 of the NOA Methodology.

Learn more about the NOA methodology

National Grid ESO - Network Options Assessment NOA 2020 download - Turbines in sunset

The NOA process

Learn how and why the NOA Process is conducted each year. It includes how we evaluate onshore and offshore reinforcement options.


NOA for interconnectors

See how the NOA Process is conducted for interconnectors.


Suitability for third party delivery and tendering assessment

Learn more about how we apply the competition assessment criteria for NOA options


ESO process for high voltage and stability management

This section covers the NOA Pathfinder voltage and stability assessments.


Early development of options and Interested Person’s process 

Read how we increase the diversity of options considered by collaborating the use of the early development of options and IP process.


Network Options Assessment (NOA)

The NOA publication and associated information are available here.