East West Interconnector

Transmission grids are often interconnected so that energy can flow from one country to another. This helps provide a safe, secure, reliable and affordable energy supply for everybody. EirGrid Interconnector DAC owns the East West Interconnector linking the electricity grids in Ireland and Great Britain. We sell capacity on the East West Interconnector through auctions.

The East West Interconnector is a 500 MW High Voltage Direct Current (HVDC) link between the electricity transmission grids of Ireland and Great Britain. At 500 MW it is one of the largest voltage source conversion (VSC) HVDC links in operation worldwide.

We sell capacity on the East West Interconnector through auctions, which you can learn more about below.

Celtic Interconnector

EirGrid is exploring an interconnector between Ireland and France, known as the Celtic Interconnector.  More information can be found here.

Trading on the Interconnector

We offer market participants access to the interconnector capacity through a combination of explicit and implicit auctions. Our approach gives market participants a choice about how they bid for capacity. Power flows will be decided by companies that trade on the East West Interconnector and will be driven by their decisions on factors such as supply, demand, prices in each market and their own energy portfolio positions.

Read in detail about trading on the interconnector by downloading our trading brochure.

Other useful links

EWIC have prepared an I-SEM Trading Guide for customers on the new FTR products being offered under the I-SEM  arrangements in 2018. This publication fulfils I-SEM milestone #195 ‘FTR Auction - Trading Information Update’ publication.

The market trial survey form is also now available to download separately here. The completed form will allow us understand your training needs on the new e-CAT and FTR markets. Please send the completed form to

SEMO Participation/Eligibility Requirements

BETTA Participation/Eligibility Requirements

Auctions & Results

Auction Management Platform - Public Access

To obtain capacity on the East West Interconnector, an application called the Auction Management Platform is used. This platform facilitates explicit capacity auctions, secondary trading, and interacts with the SEM and BETTA markets on behalf of Interconnector Users.

The Auction Management Platform is where you will find all the information you need on auctions.

You can also access the 2017 auction calendar here and the 2018 Calendar up to I-SEM Go- Live here.

Outage Information

Forced Outages 

In the event of a forced outage of the East West Interconnector, the Net Transfer Capacity (NTC) will be set to 0 MW GB-IE and IE-GB in the Auction Management Platform as soon as is practicable after the event occurs. NTC updates relating to a forced outage event will be available to view in the public version of the Auction Management Platform under 'Minute NTC' immediately after the update occurs: Minute NTC.

An overview of the communications which will issue during a forced outage and prior to return to service is available in the following document: Communications During Forced Outage‌‌.

Planned Outages

Planned outages of the East West Interconnector are coordinated between EirGrid Interconnector Limited, EirGrid Plc. and National Grid Electricity Transmission. A list of the planned outages which are currently scheduled is available here.


There are no open consultations at the current time. Read about previous consultations below.

Previous Consultations

EirGrid Interconnector DAC seek to consult on the Access Rules and Charging Methodology of the East West Interconnector (EWIC).

The purpose of this consultation is to invite the views of interested parties on the following:

  • Proposed rule changes that are required to transition to I-SEM, Financial Transmission Rights and the Harmonised Allocation Rules (“HAR”).
  • The continued applicability of the existing Moyle and East West Interconnector Access Rules and charging Methodology up to the date of I-SEM Go Live.

Documents relating to this consultation can be found below:


Safety is core to how EirGrid does business. To determine if your proposed works may be close to the route of the interconnector, please consult our safety notice and refer to the following links:


UK Line Search Before-U-Dig

If you need any additional information, call (01) 2370924 (Ireland) or 01244 288 353 (UK).

The Heath and Safety Authority have published a Code of Practice (CoP) on avoiding danger from underground services. The CoP provides practical guidelines to ensure compliance with legal requirements. It is available online here.

In the event of an emergency relating to the East West Interconnector cables, EirGrid will be contacted immediately. The emergency contact number is 01 2370924.

A detailed Irish Route Map is available here.

A detailed Wales Route Map is available here.

Contact Information

Interconnector Administrator

Tel: +44 (0)28 90707450


EirGrid Main Reception

Tel: +353 (0)1 677 1700


Emergency Number

Tel: +353 (0)1 237 0924