Last update at: 2024-05-14T13:30:00+01:00

**Please note that the last update time shown is rounded to the next market interval of 30 minutes

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Gas Storage: Historical Outages (https://www.ssehl.co.uk/HALO/)

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	Event Status			Type Of Unavailability			Type of Event
	Affected Asset or Unit			Affected Asset or Unit EIC Code

Affected Asset or Unit	Message ID	Event Status	Type Of Unavailability	Type Of Event	Publication Date/Time	Event Start	Event Stop	Unit of Measurement	Unavailable Capacity	Available Capacity	Technical Capacity	Reason Of Unavailability	Remarks	Balancing Zone	Affected Asset or Unit EIC Code	Market Participant	Market Participant Code
< 7 8 9 10 11 >
Aldbrough	ALD_000000000000000000661_005	Dismissed	Unplanned	Storage unavailability	2022-10-25T15:30:17+01:00	2022-03-22T14:15:00+00:00	2023-01-31T05:00:00+00:00	TWh	0.06761	2.3882077	2.9453019	Failure	Cavern 4 unavailable	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000661_004	Dismissed	Unplanned	Storage unavailability	2022-09-05T15:54:31+01:00	2022-03-22T14:15:00+00:00	2022-11-01T05:00:00+00:00	TWh	0.06761	2.3882077	2.9453019	Failure	Cavern 4 unavailable	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000661_003	Dismissed	Unplanned	Storage unavailability	2022-07-27T15:33:45+01:00	2022-03-22T14:15:00+00:00	2022-09-12T14:15:00+01:00	TWh	0.06761	2.3882077	2.4849147	Failure	Cavern 4 unavailable	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000843_001	Active	Planned	Storage unavailability	2023-11-13T10:05:32+00:00	2024-10-01T05:00:00+01:00	2024-12-31T05:00:00+00:00	TWh	0.232	2.9301642	3.1621642	Planned Outage	Cavern 6. Removed from service AHS.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000871_002	Inactive	Unplanned	Storage unavailability	2024-01-05T11:37:51+00:00	2023-12-28T14:26:00+00:00	2024-01-05T11:35:00+00:00	TWh	0.421650307	3.046994393	3.4686447	Failure	Cavity 1	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000871_001	Dismissed	Unplanned	Storage unavailability	2023-12-28T14:35:27+00:00	2023-12-28T14:26:00+00:00	2024-01-15T18:00:00+00:00	TWh	0.421650307	3.046994393	3.4686447	Failure	Cavity 1	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000817_002	Inactive	Planned	Storage unavailability	2023-10-13T16:49:45+01:00	2023-10-12T09:00:00+01:00	2023-10-13T16:40:00+01:00	TWh	0.4216	3.0470447	3.4686447	Planned Outage	Cavity 1 - 6 Monthly Wellhead Maintenance.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000817_001	Dismissed	Planned	Storage unavailability	2023-10-05T11:58:28+01:00	2023-10-12T09:00:00+01:00	2023-10-13T18:00:00+01:00	TWh	0.4216	3.0470447	3.4686447	Planned Outage	Cavity 1 - 6 Monthly Wellhead Maintenance.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000662_002	Dismissed	Planned	Storage unavailability	2022-04-01T10:57:06+01:00	2022-04-06T05:00:00+01:00	2022-04-09T18:00:00+01:00	TWh	0.421650307	3.046994393	3.4686447	Planned Outage	Cavity 1 Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000662_001	Dismissed	Planned	Storage unavailability	2022-03-24T13:27:01+00:00	2022-04-06T05:00:00+01:00	2022-04-09T18:00:00+01:00	TWh	0.421650307	3.046994393	3.4686447	Planned Outage	Cavity 1 Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000756_002	Inactive	Planned	Storage unavailability	2023-06-26T19:02:32+01:00	2023-06-26T05:00:00+01:00	2023-06-26T18:00:00+01:00	TWh	0.421650307	3.046994393	3.4686447	Planned Outage	Cavity 1 Wellhead Panel maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000756_001	Dismissed	Planned	Storage unavailability	2023-05-30T09:11:23+01:00	2023-06-26T05:00:00+01:00	2023-06-26T18:00:00+01:00	TWh	0.421650307	3.046994393	3.4686447	Planned Outage	Cavity 1 Wellhead Panel maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000583_003	Inactive	Planned	Storage unavailability	2021-06-02T15:34:06+01:00	2021-05-30T19:05:00+01:00	2021-06-02T15:34:00+01:00	TWh	0.226309	3.1062104	3.3325194	Planned Outage	Cavity 2	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000583_002	Dismissed	Planned	Storage unavailability	2021-05-30T19:05:34+01:00	2021-05-30T19:05:00+01:00	2021-06-06T18:00:00+01:00	TWh	0.226309	3.1062104	3.3325194	Planned Outage	Cavity 2	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000583_001	Dismissed	Planned	Storage unavailability	2021-05-05T16:01:27+01:00	2021-06-01T05:00:00+01:00	2021-06-06T18:00:00+01:00	TWh	0.226309	3.1062104	3.3325194	Planned Outage	Cavity 2	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000805_002	Inactive	Planned	Storage unavailability	2023-09-12T10:32:11+01:00	2023-09-11T08:00:00+01:00	2023-09-12T18:00:00+01:00	TWh	0.238280125	3.230364575	3.4686447	Planned Outage	Cavity 2	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000805_001	Dismissed	Planned	Storage unavailability	2023-09-07T13:34:25+01:00	2023-09-11T08:00:00+01:00	2023-09-12T18:00:00+01:00	TWh	0.238280125	3.230364575	3.4686447	Planned Outage	Cavity 2	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000722_002	Inactive	Planned	Storage unavailability	2023-01-19T19:02:32+00:00	2023-01-19T06:00:00+00:00	2023-01-19T18:00:00+00:00	TWh	0.238280125	3.230364575	3.4686447	Planned Outage	Cavity 2 Six Monthly Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000722_001	Dismissed	Planned	Storage unavailability	2023-01-10T07:29:17+00:00	2023-01-19T06:00:00+00:00	2023-01-19T18:00:00+00:00	TWh	0.238280125	3.230364575	3.4686447	Planned Outage	Cavity 2 Six Monthly Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000815_003	Inactive	Planned	Storage unavailability	2023-10-05T15:50:35+01:00	2023-10-03T16:00:00+01:00	2023-10-05T15:45:00+01:00	TWh	0.2383	3.2303447	3.4686447	Planned Outage	Cavity 2 SSSV	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000815_002	Dismissed	Planned	Storage unavailability	2023-10-04T15:53:28+01:00	2023-10-03T16:00:00+01:00	2023-10-05T16:00:00+01:00	TWh	0.2383	3.2303447	3.4686447	Planned Outage	Cavity 2 SSSV	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000815_001	Dismissed	Planned	Storage unavailability	2023-10-03T16:01:59+01:00	2023-10-03T16:00:00+01:00	2023-10-04T16:00:00+01:00	TWh	0.2383	3.2303447	3.4686447	Planned Outage	Cavity 2 SSSV	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000760_004	Inactive	Planned	Storage unavailability	2023-06-21T11:16:09+01:00	2023-06-02T09:00:00+01:00	2023-06-21T11:15:00+01:00	TWh	0.238280125	3.230364575	3.4686447	Planned Outage	Cavity 2 Wellhead maintenance and intervention works.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000760_003	Dismissed	Planned	Storage unavailability	2023-06-20T17:32:54+01:00	2023-06-02T09:00:00+01:00	2023-06-21T18:00:00+01:00	TWh	0.238280125	3.230364575	3.4686447	Planned Outage	Cavity 2 Wellhead maintenance and intervention works.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000760_002	Dismissed	Planned	Storage unavailability	2023-06-17T13:36:43+01:00	2023-06-02T09:00:00+01:00	2023-06-20T18:00:00+01:00	TWh	0.238280125	3.230364575	3.4686447	Planned Outage	Cavity 2 Wellhead maintenance and intervention works.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000760_001	Dismissed	Planned	Storage unavailability	2023-05-30T09:33:05+01:00	2023-06-02T09:00:00+01:00	2023-06-18T18:00:00+01:00	TWh	0.238280125	3.230364575	3.4686447	Planned Outage	Cavity 2 Wellhead maintenance and intervention works.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000757_001	Dismissed	Planned	Storage unavailability	2023-05-30T09:16:24+01:00	2023-06-26T18:00:00+01:00	2023-06-27T18:00:00+01:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 2 Wellhead Panel Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000821_002	Inactive	Planned	Storage unavailability	2023-10-24T16:45:00+01:00	2023-10-23T09:00:00+01:00	2023-10-24T16:40:00+01:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 3 - 6 Monthly Wellhead maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000821_001	Dismissed	Planned	Storage unavailability	2023-10-13T08:05:53+01:00	2023-10-23T09:00:00+01:00	2023-10-24T18:00:00+01:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 3 - 6 Monthly Wellhead maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000786_004	Inactive	Planned	Storage unavailability	2023-09-05T16:33:08+01:00	2023-08-25T05:00:00+01:00	2023-09-05T16:32:00+01:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 3 Intervention works	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000786_003	Dismissed	Planned	Storage unavailability	2023-08-17T14:47:49+01:00	2023-08-25T05:00:00+01:00	2023-09-09T18:00:00+01:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 3 Intervention works	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000786_002	Dismissed	Planned	Storage unavailability	2023-08-17T14:02:38+01:00	2023-08-25T05:00:00+01:00	2023-09-05T18:00:00+01:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 3 Intervention works	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000786_001	Dismissed	Planned	Storage unavailability	2023-07-17T12:12:54+01:00	2023-09-26T05:00:00+01:00	2023-10-24T18:00:00+01:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 3 Intervention works	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000618_003	Inactive	Unplanned	Storage unavailability	2021-11-29T15:35:20+00:00	2021-11-24T16:23:00+00:00	2021-11-29T15:30:00+00:00	TWh	0.371148	2.9581143	3.3292623	Planned Outage	Cavity 3 outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000618_002	Dismissed	Unplanned	Storage unavailability	2021-11-26T12:31:29+00:00	2021-11-24T16:23:00+00:00	2021-11-29T18:00:00+00:00	TWh	0.371148	2.9581143	3.3292623	Planned Outage	Cavity 3 outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000723_002	Inactive	Planned	Storage unavailability	2023-01-20T18:43:05+00:00	2023-01-20T06:00:00+00:00	2023-01-20T18:00:00+00:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 3 Six Monthly Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000723_001	Dismissed	Planned	Storage unavailability	2023-01-10T07:31:25+00:00	2023-01-20T06:00:00+00:00	2023-01-20T18:00:00+00:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 3 Six Monthly Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000757_003	Inactive	Planned	Storage unavailability	2023-06-27T19:02:33+01:00	2023-06-26T18:00:00+01:00	2023-06-27T18:00:00+01:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 3 Wellhead Panel Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000757_002	Dismissed	Planned	Storage unavailability	2023-05-30T09:18:02+01:00	2023-06-26T18:00:00+01:00	2023-06-27T18:00:00+01:00	TWh	0.390799835	3.077844865	3.4686447	Planned Outage	Cavity 3 Wellhead Panel Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000783_002	Inactive	Planned	Storage unavailability	2023-07-24T15:46:21+01:00	2023-07-20T05:00:00+01:00	2023-07-24T15:40:00+01:00	TWh	0.665322552	2.803322148	3.4686447	Planned Outage	Cavity 5 Interventions and wellhead maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000783_001	Dismissed	Planned	Storage unavailability	2023-07-17T11:58:25+01:00	2023-07-20T05:00:00+01:00	2023-07-25T18:00:00+01:00	TWh	0.665322552	2.803322148	3.4686447	Planned Outage	Cavity 5 Interventions and wellhead maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000724_002	Inactive	Planned	Storage unavailability	2023-01-27T18:55:31+00:00	2023-01-27T06:00:00+00:00	2023-01-27T18:55:00+00:00	TWh	0.665322552	2.803322148	3.4686447	Planned Outage	Cavity 5 Six Monthly Maintenace	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000724_001	Dismissed	Planned	Storage unavailability	2023-01-10T07:34:25+00:00	2023-01-27T06:00:00+00:00	2023-01-27T18:00:00+00:00	TWh	0.665322552	2.803322148	3.4686447	Planned Outage	Cavity 5 Six Monthly Maintenace	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000758_002	Inactive	Planned	Storage unavailability	2023-06-28T19:02:32+01:00	2023-06-27T18:00:00+01:00	2023-06-28T18:00:00+01:00	TWh	0.665322552	2.803322148	3.4686447	Planned Outage	Cavity 5 Wellhead panel maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000758_001	Dismissed	Planned	Storage unavailability	2023-05-30T09:20:27+01:00	2023-06-27T18:00:00+01:00	2023-06-28T18:00:00+01:00	TWh	0.665322552	2.803322148	3.4686447	Planned Outage	Cavity 5 Wellhead panel maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000820_002	Inactive	Planned	Storage unavailability	2023-10-19T17:00:38+01:00	2023-10-19T09:00:00+01:00	2023-10-19T17:00:00+01:00	TWh	0.483344926	2.985299774	3.4686447	Planned Outage	Cavity 6 - 6 monthly Wellhead Maintenance.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000820_001	Dismissed	Planned	Storage unavailability	2023-10-05T13:36:56+01:00	2023-10-19T09:00:00+01:00	2023-10-20T18:00:00+01:00	TWh	0.483344926	2.985299774	3.4686447	Planned Outage	Cavity 6 - 6 monthly Wellhead Maintenance.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000663_002	Dismissed	Planned	Storage unavailability	2022-04-01T10:57:31+01:00	2022-04-09T18:00:00+01:00	2022-04-14T18:00:00+01:00	TWh	0.483344926	2.985299774	3.4686447	Planned Outage	Cavity 6 Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000663_001	Dismissed	Planned	Storage unavailability	2022-03-31T13:19:34+01:00	2022-04-09T18:00:00+01:00	2022-04-14T18:00:00+01:00	TWh	0.483344926	2.985299774	3.4686447	Planned Outage	Cavity 6 Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000759_002	Inactive	Planned	Storage unavailability	2023-06-29T19:02:32+01:00	2023-06-28T18:00:00+01:00	2023-06-29T18:00:00+01:00	TWh	0.483344926	2.985299774	3.4686447	Planned Outage	Cavity 6 Wellhead Panel Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK

The information that is set out on these pages is provided pursuant to Regulation (EU) 1227/2011 and associated guidance. The provision, reading or use of the information neither establishes a contract nor creates a unilateral guarantee. Nor does the provision of information constitute the furnishing of investment advice, or an invitation to buy or sell goods, derivatives or (other) financial instruments. If any provisions of this disclaimer shall be unlawful, void or for any reason unenforceable then that provision shall be deemed severable and shall not affect the validity and enforceability of the remaining provisions. This disclaimer is given on the basis of English law and shall be subject to the exclusive jurisdictions of the English courts. Historical UMMs as previously published can be located within the public area of our website – https://www.ssehl.co.uk/HALO. An explanation of how we calculate our maximum technical capacities and how we measure is available from https://www.ssehl.co.uk/HALO.