Outage Information
How we plan for generator and transmission outages, including testing and maintenance.
Generation Outage
As part of maintaining the grid, we develop and implement a Generation Outage Plan. Power stations are sometimes unavailable due to maintenance or other reasons. This plan ensure that these planned outages are well coordinated.
It takes into account:
- Security of supply in Ireland and Northern Ireland
- Economic operation of the power system
- The maintenance and resource needs of generators
Find annual outage plans on the TSO Responsibilities page of the SEM-O website, under Outages.
Generation Outage Requests
Generators can send outage requests to us using the Generator Outage Request Form. This covers new and changed outages, including short-term requests.
The forms for Generator Outage requests are below.
Short-Term Maintenance Outages (STMOs)
STMOs are usually less than 48 hours. They're typically carried out overnight or at the weekend.
For STMO requests, we assess the planned network configuration, forecast load, and capacity margin for the outage time.
STMO requests should be made at least five working days before the outage start time and date.
Generator HV Plant Outages
For an outage scheduled on the Committed Outage Program and Transmission Outage Program, please complete a Generator VO Request Form. Requests should be made at least 7 working days before the outage start date.
The start and end dates must be in line with the Committed Outage Program and Transmission Outage Program.
For outages not in these programmes, we require 10 working days notice to assess their feasibility.
Generator Outage Publications
A weekly All-Island Outage Plan covering the next 16 weeks is published here. The report consists of two worksheets. The first sheet shows the outages graphically at a daily level. The second worksheet shows the start and finish times and dates of the outages. Outages are represented with an abbreviation in the files - “S” represents a Scheduled Outage and “F” represents a Forced Outage.
- Outage Week 13(2024) - 28(2024) - Published on 27 March 2024
- Outage Week 13(2024) - 28(2024) - Published on 20 March 2024
- Outage Week 12(2024) - 27(2024) - Published on 13 March 2024
- Outage Week 11(2024) - 26(2024) - Published on 6 March 2024
- Outage Week 10(2024) - 25(2024) - Published on 28 February 2024
- Outage Week 09(2024) - 24(2024) - Published on 21 February 2024
- Outage Week 08(2024) - 23(2024) - Published on 15 February 2024
- Outage Week 07(2024) - 22(2024) - Published on 7 February 2024
- Outage Week 06(2024) - 21(2024) - Published on 31 January 2024
- Outage Week 05(2024) - 20(2024) - Published on 24 January 2024
- Outage Week 04(2024) - 19(2024) - Published on 17 January 2024
- Outage Week 03(2024) - 18(2024) - Published on 10 January 2024
- Outage Week 02(2024) - 17(2024) - Published on 3 January 2024
- Outage Week 01(2024) - 16(2024) - Published on 28 December 2023
- Outage Week 52(2023) - 15(2024) - Published on 20 December 2023
- Outage Week 51(2023) - 14(2024) - Published on 13 December 2023
- Outage Week 50(2023) - 13(2024) - Published on 6 December 2023
- Outage Week 49(2023) - 12(2024) - Published on 29 November 2023
- Outage Week 48(2023) - 11(2024) - Published on 23 November 2023
- Outage Week 47(2023) - 10(2024) - Published on 15 November 2023
- Outage Week 46(2023) - 09(2024) - Published on 08 November 2023
- Outage Week 45(2023) - 08(2024) - Published on 01 November 2023
- Outage Week 44(2023) - 07(2024) - Published on 25 October 2023
- Outage Week 43(2023) - 06(2024) - Published on 18 October 2023
- Outage Week 42(2023) - 05(2024) - Published on 11 October 2023
- Outage Week 41(2023) - 04(2024) - Published on 04 October 2023
- Outage Week 40(2023) - 03(2024) - Published on 27 September 2023
- Outage Week 39(2023) - 02(2024) - Published on 20 September 2023
- Outage Week 38(2023) - 01(2024) - Published on 13 September 2023
- Outage Week 37(2023) - 52(2023) - Published on 06 September 2023
- Outage Week 36(2023) - 51(2023) - Published on 30 August 2023
- Outage Week 35(2023) - 50(2023) - Published on 23 August 2023
- Outage Week 34(2023) - 49(2023) - Published on 16 August 2023
- Outage Week 33(2023) - 48(2023) - Published on 09 August 2023
- Outage Week 32(2023) - 47(2023) - Published on 02 August 2023
- Outage Week 31(2023) - 46(2023) - Published on 26 July 2023
- Outage Week 30(2023) - 45(2023) - Published on 19 July 2023
- Outage Week 29(2023) - 44(2023) - Published on 12 July 2023
- Outage Week 28(2023) - 43(2023) - Published on 05 July 2023
- Outage Week 27(2023) - 42(2023) - Published on 28 June 2023
- Outage Week 26(2023) - 41(2023) - Published on 21 June 2023
- Outage Week 25(2023) - 40(2023) - Published on 14 June 2023
- Outage Week 24(2023) - 39(2023) - Published on 07 June 2023
- Outage Week 23(2023) - 38(2023) - Published on 31 May 2023
- Outage Week 22(2023) - 37(2023) - Published on 26 May 2023
- Outage Week 21(2023) - 36(2023) - Published on 17 May 2023
- Outage Week 20(2023) - 35(2023) - Published on 10 May 2023
- Outage Week 19(2023) - 34(2023) - Published on 03 May 2023
- Outage Week 18(2023) - 33(2023) - Published on 26 April 2023
- Outage Week 17(2023) - 32(2023) - Published on 19 April 2023
- Outage Week 16(2023) - 31(2023) - Published on 12 April 2023
- Outage Week 15(2023) - 30(2023) - Published on 05 April 2023
- Outage Week 14(2023) - 29(2023) - Published on 29 March 2023
- Outage Week 13(2023) - 28(2023) - Published on 22 March 2023
- Outage Week 12(2023) - 27(2023) - Published on 15 March 2023
- Outage Week 11(2023) - 26(2023) - Published on 08 March 2023
- Outage Week 10(2023) - 25(2023) - Published on 01 March 2023
- Outage Week 09(2023) - 24(2023) - Published on 22 February 2023
- Outage Week 08(2023) - 23(2023) - Published on 14 February 2023
- Outage Week 07(2023) - 22(2023) - Published on 08 February 2023
- Outage Week 06(2023) - 21(2023) - Published on 01 February 2023
- Outage Week 05(2023) - 20(2023) - Published on 25 January 2023
- Outage Week 04(2023) - 19(2023) - Published on 18 January 2023
- Outage Week 03(2023) - 18(2023) - Published on 11 January 2023
- Outage Week 02(2023) - 17(2023) - Published on 04 January 2023
- Outage Week 01(2023) - 16(2023) - Published on 03 January 2023
Transmission Outages
Our Transmission Outage Programme plans times when transmission infrastructure (lines, cables and transformers etc.) will be out-of-service for maintenance or capital works.
Transmission Outage Requests
Transmission connected customers can make outage requests using the Transmission Outage Request Form. Please make requests as early as possible, at least three weeks before the planned outage.
This gives us time to conduct relevant studies and for ESBN to assign Network Technician resources. Works requiring an EI must be submitted at least five weeks in advance.
Outages Affecting Generator Connections
We collect information on generator transformer and house transformer outage requirements for the coming year.
This feeds into the development of the Transmission Outage Program. Once this is complete, we give generators details of all transmission outages affecting them.
During specific transmission outages, we 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.
Transmission Outages Publications
- Transmission Outage Programme 2024
- Transmission Outage Programme 2024 CAPEX and Maintenance
- Transmission Outage Programme 2023
- Transmission Outage Programme 2023 CAPEX and Maintenance
- Transmission Outage Summary 2024 (Week 14-15)
- Transmission Outage Summary 2024 (Week 12-13)
- Transmission Outage Summary 2024 (Week 10-11)
- Transmission Outage Summary 2024 (Week 8-9)
- Transmission Outage Summary 2024 (Week 6-7)
- Transmission Outage Summary 2024 (Week 4-5)
- Transmission Outage Summary 2024 (Week 1-3)
Previous summaries can be found in our Publications library.
Outturn Availability
The below decision paper covers the process for calculating outturn availability.
The documents that follow give more information for the current outage season.
Joint Outage Transformation Programme
Outage management is a critical and challenging space.
An exceptional scale and pace of change in this area is necessary to deliver the new transmission infrastructure required to achieve our electrification and renewable energy targets by 2030.
EirGrid and ESB Networks have been working closely on this as a priority and our Joint Outage Transformation Programme (JOTP) is under way.
This statement sets out the various interventions that the JOTP is focused on to increase outage availability, maximise utilization and effectiveness of outages.