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TABLE-North Sea gas maintenance schedule: Adds UGS Bergermeer and Zeebrugge outages

ReutersAug 18, 2025 9:09 AM

- The following is a schedule of maintenance work on gas infrastructure, mainly in the North Sea.

The table is arranged by outage start date.

Volumes are in standard million cubic metres per day (mcm/d) or gigawatt-hours per day (GWh/d) unless otherwise indicated.

OPERATOR

LOCATION

OUTAGE DATES

OUTAGE DESCRIPTION/IMPACT

2021 OUTAGES

Fluxys

Interconnector

Jul 6, 0600 CET - Mar 31, 2028 0600 CET

UK import capacity reduction to 31,392,673 kWh/h; unplanned equipment maintenance

2024 OUTAGES

SSE

Atwick

Apr 9, 2024 0850 BST- Jun 26, 2026 0500 BST

45 GWh/d planned withdrawal unavailability; phase 6 reduction

Kistos Energy Storage

Hole House

Jul 06, 2024 1359 BST - Mar 31, 2026 1359 BST

0.5231 TWh Planned other unavailability

Hole House Gas Storage facility will not be returned to commercial operation. The plant will still be required to do gas withdrawals and small injections during the decommissioning process, which will be completed by the end date specified.

2025 OUTAGES

INEOS

FPS system

Q2 (Apr)

Train 1 pit stop is planned, with forecast duration of two to three (2-3) weeks

SSE

Atwick

Jun 24, 1042 BST - Sep 4, 1800 BST

0.481 TWh/ Planned storage unavailability

Perenco #

Bacton

July 28 0600 BST - Aug 19, 0600 BST

3.4 mcm/d planned gas production field unavailability

Ithaca Energy UK Ltd

Cygnus

Aug 01, 0900 BST - Aug 26, 0600 BST

4.3 mcm/d; planned gas production field unavailability

TotalEnergies UK

Bacton SEAL

Aug 01, 0600 BST - Aug 26, 0600 BST

5 mcm/d; Planned gas treatment plant unavailability

SSE

Aldbrough

Aug 01, 0500 BST - Sep 24, 1800 BST

0.442 TWh; planned outage A7 maintenance

BBL Company

BBL pipeline

Aug 05, 0600 CET - Aug 26, 0600 CET

-1.10 Gwh/d; Unplanned unavailability of gas

SSE

Aldbrough

Aug 06, 1445 BST - Aug 31, 1800 BST

71.1 GWh/d; unplanned injection unavailability

Gassco

Karsto

Aug 07, 0600 CET - Aug 25, 0600 CET

16.6 mcm/d; yearly maintenance

Gassco

St.Fergus

Aug 11, 0600 CET - Aug 16, 0600 CET

19.8 mcm/d; yearly maintenance

Total EP UK #

NSMP St. Fergus (Alwyn)

Aug 12, 0600 BST - Aug 17, 0600 BST

1.4 mcm/d; Unplanned gas production field unavailability

Spirit Energy

Barrow (North Terminal)

Aug 12, 0600 BST - Aug 13, 1600 BST

6 mcm/d; Unplanned gas treatment plant unavailability

Total EP UK

Teesside CATS (Culzean)

Aug 12, 1200 BST - Aug 14, 0600 BST

48 GWh/d; Unplanned gas production field unavailability

SSE #

Atwick

Aug 14, 1930 BST - Aug 22, 1800 BST

100 GWh/d; Unplanned withdrawal unavailability

Harbour Energy Plc

Greater Britannia Area

Aug 15, 0600 BST - Aug 20, 0600 BST

7 mcm/d; Planned gas production field unavailability

TAQA +

UGS Bergermeer

Aug 16, 0400 CET - Sep 28, 0400 CET

146 to 178 GWh/d; Gas treatment plant unavailability

SSE #

Aldbrough

Aug 18, 1800 BST - Aug 18 1800 BST

66.98 GWh/d; Planned withdrawal unavailability

Gassco

Ormen Lange

Aug 18, 0600 CET - Sep 12, 0600 CET

12.1 mcm/d; Corrective maintenance

TAQA

UGS Bergermeer

Aug 18, 0400 CET - Sept 28, 0400 CET

-148.8 to -184.8 GWh/d; Gas treatment plant unavailability

INEOS

FPS system

Aug 19

The annual Unity ESDV closure test, Cruden Bay NGL ESDV leak test, and Forties Charlie equipment tests will take place, and the Cruden Bay HIPPS System will be tested

Scottish Power

Hatfield Withdrawal

Aug 20, 0500 BST - Aug 20, 1700 BST

20 GWh/d; Planned withdrawal unavailability

SSE

Atwick

Aug 26, 0800 BST - Aug 26, 1600 BST

130 GWh/d; Planned withdrawal unavailability

Gassco

Aasta Hansteen

Aug 26, 0600 CET - Aug 30, 0600 CET

-20.4 mcm/d; Yearly maintenance

Gassco

Nyhamna

Aug 26, 0600 CET - Aug 28, 0600 CET

-49.8 mcm/d; Yearly maintenance

Gassco

Ormen Lange

Aug 27, 0600 CET - Aug 28, 0600 CET

-28.1 mcm/d; Yearly maintenance

Gassco

Easington

Aug 27, 0600 CET - Aug 28, 0600 CET

-42.7 mcm/d; Yearly maintenance

Gassco

Sleipner

Aug 27, 0600 CET - Sep 22, 0600 CET

-12.7 to -15.4 mcm/d; Yearly maintenance

Gassco

Troll

Aug 28, 0600 CET - Aug 30, 0600 CET

-16 mcm/d; Yearly maintenance

Gassco

Emden

Aug 28, 0600 CET - Sep 01, 0600 CET

-20.1 mcm/d yearly maintenance

Gassco

Sleipner

Aug 28, 0600 CET - Sep 22, 0600 CET

-13.1 to -12.7 mcm/d; yearly maintenance

Gassco

Emden

Aug 29, 0600 CET - Sep 02, 0600 CET

-20.1 mcm/d; Yearly maintenance; Uncertain timing

Gassco

Troll

Aug 30, 0600 CET - Sep 13, 0600 CET

-63 mcm/d; yearly maintenance

Gassco

Aasta Hansteen

Aug 30, 0600 CET - Aug 31, 0600 CET

11.4 mcm/d; yearly maintenance

Gassco

Easington

Aug 30, 0600 CET - Sep 09, 0600 CET

-22.7 mcm/d; Upstream restriction

Gassco

Kollsnes

Aug 30, 0600 CET - Sep 18, 0600 CET

-78 mcm/d; Downstream restriction,

Gassco

Kollsnes

Aug 30, 0600 CET - Sep 09, 0600 CET

-43 mcm/d; yearly maintenance

INEOS

FPS system

Q3

Hound Point 1 Outage is being planned, with forecast duration of two to three (2-3) weeks

Gassco

Gulfaks

Sep 01, 0600 CET - Oct 01, 0600 CET

-11.5 mcm/d; Yearly maintenance

Gassco

Easington

Sep 02, 0600 CET - Sep 19, 0600 CET

17.7 to 33.7 mcm/d; Yearly maintenance

SSE

Aldbrough

Sep 02, 0500 BST - Sep 12, 1800 BST

0.41 to 0.82 TWh; Planned storage unavailability

Perenco

Bacton

Sep 07, 0600 BST - Oct 01, 0600 BST

2.2 mcm/d planned gas treatment plant unavailability

Spirit Energy

Barrow (North Terminal)

Sep 07, 0600 BST - Oct 03, 0600 BST

6 mcm/d planned unavailability

BBL Company

BBL pipeline

Sep 08, 0600 CET - Sep 12, 0600 CET

Planned maintenance

Gassco

Fields Delivering Into SEGAL

Sep 09, 0600 CET - Sep 10, 0600 CET

-13.9 mcm/d; Yearly maintenance

Gassco

Nymhamna

Sep 09, 0600 CET - Sep 12, 0600 CET

-49.8 mcm/d; Yearly maintenance

Gassco

Karsto

Sep 09, 0600 CET - Sep 12, 0600 CET

-10.6 mcm/d; Yearly maintenance

Gassco

Kollsnes

Sep 09, 0600 CET - Sep 22, 0600 CET

-16 mcm/d; Yearly maintenance

Gassco

Oseberg

Sep 11, 0600 CET - Sep 23, 0600 CET

-10 mcm/d; yearly maintenance

Gassco

Troll

Sep 13, 0600 CET - Sep 24, 0600 CET

-16.0 mcm/d; Yearly maintenance

Scottish Power

Hatfield Injection

Sep 14, 0500 BST - Sep 26, 1700 BST

27 GWh/d; Planned injection unavailability

Gassco

Nyhamna

Sep 15, 0600 CET - Sept 17, 0600 CET

-51.8 mcm/d; Yearly maintenance

SSE +

Aldbrough

Sep 16, 0500 BST - Sep 24, 1800 BST

0.47 GWh; Planned storage unavailability

Gassco

Nyhamna

Sep 17, 0600 CET - Sep 18, 0600 CET

-34.8 mcm/d; yearly maintenance

Gassco +

Zeebrugge

Sep 18, 0600 CET - Sep 19, 0600 CET

-42.1 mcm/d; upstream restriction

Gassco

Kollsnes

Sep 18, 0600 CET - Sep 22, 0600 CET

-16 mcm/d; Yearly maintenance

Gassco

Emden

Sep 18, 0600 CET - Sep 22, 0600 CET

-20.1 mcm/d; yearly maintenance

Gassco

Ormen Lange

Sep 19, 0600 CET - Sep 20, 0600 CET

-18.2 mcm/d; yearly maintenance

Gassco

Nyhamna

Sep 19, 0600 CET - Sept 21, 0600 CET

-51.8 mcm/d; Yearly maintenance

Gassco

Emden

Sep 19, 0600 CET - Sept 23, 0600 CET

-20.1 mcm/d; Yearly maintenance; Uncertain timing

Gassco

Kristin

Sep 24, 0600 CET - Sep 25, 0600 CET

-12.1 mcm/d; Yearly maintenance

Gassco

Asgard

Sep 23, 0600 CET - Sep 25, 0600 CET

-29.3 to -18.7 mcm/d; Yearly maintenance

Gassco

Skarv

Sep 24, 0600 CET - Sep 25, 0600 CET

-13.9 mcm/d; yearly maintenance

Gassco

Kristin

Sep 24, 0600 CET - Sep 25, 0600 CET

-14.6 mcm/d; yearly maintenance

Gassco

Karsto

Sep 24, 0600 CET - Sep 25, 0600 CET

-67.6 mcm/d; yearly maintenance

Gassco

Nyhamna

Oct 01, 0600 CET - Oct 02, 0600 CET

-51.8 mcm/d; yearly maintenance

Gassco

Karsto

Oct 01, 0600 CET - Oct 15, 0600 CET

19.6 mcm/d; yearly maintenance

KN Energies

Klaipeda LNG

Oct 06, 0400 CET - Oct 09, 0400 CET

117 GWh/d; Regasification plant unavailability

KN Energies

Klaipeda LNG

Oct 13, 0400 CET - Oct 16, 0400 CET

117 GWh/d; Regasification plant unavailability

Gassco

Oseberg

Oct 16, 0600 CET - Oct 17, 0600 CET

-27 mcm/d; yearly maintenance

Kistos Energy Storage Ltd

Hill Top

Oct 21, 1255 GMT - Oct 21, 1800 GMT

0.6477 TWh Planned unavailability

Kistos Energy Storage Ltd

Hill Top

Oct 22, 0800 GMT - Oct 22, 1800 GMT

0.6477 TWh Planned unavailability

Kistos Energy Storage Ltd

Hill Top

Oct 23, 1309 GMT - Oct 23, 1800 GMT

0.6477 TWh Planned unavailability

Gassco

Visund

Dec 01, 0600 CET - Dec 02, 0600 CET

-15.1 mcm/d; yearly maintenance

INEOS

FPS system

2025

The Old Lock Berth Outage will take place

2026 OUTAGES

Gassco

Karsto

Jan 05, 0600 CET - Jan 14, 0600 CET

-15.6 mcm/d; Yearly maintenance

Gassco

Aasta Hansteen

Mar 15, 0600 CET - Mar 20, 0600 CET

-18.7 to -10.0 mcm/d; yearly maintenance

Gassco

Troll

Mar 19, 0600 CET - May 21, 0600 CET

-11.0 to 125.4 mcm/d; yearly maintenance

Gassco

Troll

Apr 09, 0600 CET - Apr 22, 0600 CET

-13.0 mcm/d; yearly maintenance

Gassco

Troll

Apr 22, 0600 CET - May 01, 0600 CET

-13.0 to 98.0 mcm/d; yearly maintenance

Gassco #

Fields delivering into SEGAL

Jun 02, 0600 CET - Jun 09, 0600 CET

-13.9 mcm/d; yearly maintenance

Gassco

Visund

Jun 09, 0600 CET - Jun 11, 0600 CET

-15.1 mcm/d; yearly maintenance

Gassco

Sleipner

Aug 28, 0600 CET - Sep 22, 0600 CET

-13.1 mcm/d; yearly maintenance

Gassco

Troll

Aug 29, 0600 CET - Sep 16, 0600 CET

-13.0 mcm/d; yearly maintenance

Fluxys

Interconnector

Sep 1 - Sep 20

Planned maintenance shutdown

Gassco

Asgard

Sep 23, 0600 CET - Sep 24, 0600 CET

-29.3 mcm/d; yearly maintenance

Gassco

Oseberg

Sep 23, 0600 CET - Sep 30, 0600 CET

-13.5 mcm/d; yearly maintenance

Gassco

Oseberg

Oct 10, 0600 CET - Oct 23, 0600 CET

-27.5 mcm/d; yearly maintenance

Gassco

Visund

Dec 01, 0600 CET - Dec 02, 0600 CET

-14.8 mcm/d; yearly maintenance

NOTES:

  • To see all Gassco outages, please click https://bit.ly/3rQojCd

  • CET - Central European Time (GMT +1 or GMT +2, depending on time of the year)

  • * Capacity loss attributable to separate caverns

  • + indicates new addition

  • # indicates revision

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