Transmission Outages

Transmission Outages involve planned times when transmission infrastructure (lines, cables and substations etc.) will be maintained and not in service. It also involves times when testing, connection of new plant and decommissioning of old plant is carried out.

Off Season Transmission Outage Programme 2017/18

High priority work may be carried out over the winter period by exception. This is detailed in the following document summarising off-season outages:

2017/18 Off-Season Transmission Outage Programme 

Transmission Outage Programme 2017

We plan and manage an annual Transmission Outage Programme. This programme includes all outages of transmission infrastructure which are planned to occur this year. You can access a list of planned outages for the remainder of 2017 here. Separate tabs are provided to list outages by region. An ‘Info’ tab is provided to give information on the transmission outage planning process. An updated version of this document will be published in the first week of each month.

The following are the weekly documents dealing with the Transmission Outage Programme 2017.

Transmission Outage Summary 2017 (Week 47-48)

Transmission Outage Summary 2017 (Week 45-46)

Transmission Outage Summary 2017 (Week 43-44)

Transmission Outage Summary 2017 (Week 41-42)

Transmission Outage Summary 2017 (Week 39-40)

Transmission Outage Summary 2017 (Week 37-38)

Transmission Outage Summary 2017 (Week 35-36)

Transmission Outage Summary 2017 (Week 33-34)

Transmission Outage Summary 2017 (Week 31-32)

Transmission Outage Summary 2017 (Week 29-30)

Transmission Outage Summary 2017 (Week 27-28)

Transmission Outage Summary 2017 (Week 25-26)

Transmission Outage Summary 2017 (Week 23-24)

Please search our Library section for archived documents.

Transmission Outage Requests

Transmission connected customers can submit Transmission Outage requests to EirGrid using the Transmission Outage Request Form.

Communicating with EirGrid about outages

For outages of generator unit transformers or any other outage on the generator’s side that affects availability, an e-mail containing the outage requirements should be sent to

Transmission outages affecting a generator’s point of connection to the system are managed as follows:

Outage Planning asks for generator transformer and house transformer outage requirements for the coming year.

The information received feeds into the development of the Transmission Outage Program.

When the final Transmission Outage Program is complete, we give all generators details of all transmission outages affecting them.

During specific transmission outages EirGrid will notify a station that a generation unit’s Availability as defined in the Grid Code will be different from the Outturn Availability in the transmission dispatch system.

Where this occurs stations should complete the form here to record any changes in the units Availability. 

Requests for changes to scheduled transmission outages should be submitted to