Last update at: 2024-10-13T11:00:00+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
< 5 6 7 8 9 >
Atwick	ATW_000000000000000000767_002	Inactive	Planned	Withdrawal unavailability	2023-06-29T08:29:51+01:00	2023-06-24T07:00:00+01:00	2023-06-29T08:28:00+01:00	GWh/d	100	30	130	Planned Outage	Phase 6	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000767_001	Dismissed	Planned	Withdrawal unavailability	2023-06-23T12:45:15+01:00	2023-06-24T07:00:00+01:00	2023-06-30T05:00:00+01:00	GWh/d	100	30	130	Planned Outage	Phase 6	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_000000000000000000770_002	Inactive	Unplanned	Withdrawal unavailability	2023-06-28T14:05:55+01:00	2023-06-28T11:46:00+01:00	2023-06-29T14:05:00+01:00	GWh/d	130	0	130	Failure		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000770_001	Dismissed	Unplanned	Withdrawal unavailability	2023-06-28T11:47:13+01:00	2023-06-28T11:46:00+01:00	2023-06-29T18:00:00+01:00	GWh/d	130	0	130	Failure		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000769_002	Inactive	Unplanned	Withdrawal unavailability	2023-06-28T10:40:27+01:00	2023-06-27T21:10:00+01:00	2023-06-28T10:40:00+01:00	GWh/d	130	0	130	Failure	full site out	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000769_001	Dismissed	Unplanned	Withdrawal unavailability	2023-06-27T21:14:15+01:00	2023-06-27T21:10:00+01:00	2023-06-28T12:00:00+01:00	GWh/d	130	0	130	Failure	full site out	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000761_005	Inactive	Planned	Storage unavailability	2023-06-27T19:02:33+01:00	2023-06-21T09:00:00+01:00	2023-06-27T18:00:00+01:00	TWh	0.468711066	2.999933634	3.4686447	Planned Outage	Cavity 9 Annual Wellhead Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000761_004	Dismissed	Planned	Storage unavailability	2023-06-26T16:26:05+01:00	2023-06-21T09:00:00+01:00	2023-06-27T18:00:00+01:00	TWh	0.468711066	2.999933634	3.4686447	Planned Outage	Cavity 9 Annual Wellhead Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000761_003	Dismissed	Planned	Storage unavailability	2023-06-23T11:53:57+01:00	2023-06-21T09:00:00+01:00	2023-06-26T18:00:00+01:00	TWh	0.468711066	2.999933634	3.4686447	Planned Outage	Cavity 9 Annual Wellhead 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_000000000000000000768_003	Inactive	Unplanned	Storage unavailability	2023-06-27T19:02:33+01:00	2023-06-24T07:30:00+01:00	2023-06-27T18:00:00+01:00	TWh	0.48312084	2.5168128	3.4686447	Failure	Cavity 8	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000768_002	Dismissed	Unplanned	Storage unavailability	2023-06-26T16:22:59+01:00	2023-06-24T07:30:00+01:00	2023-06-27T18:00:00+01:00	TWh	0.48312084	2.5168128	3.4686447	Failure	Cavity 8	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000761_002	Dismissed	Planned	Storage unavailability	2023-06-17T13:38:52+01:00	2023-06-21T09:00:00+01:00	2023-06-25T18:00:00+01:00	TWh	0.468711066	2.999933634	3.4686447	Planned Outage	Cavity 9 Annual Wellhead 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_000000000000000000761_001	Dismissed	Planned	Storage unavailability	2023-05-30T09:54:03+01:00	2023-06-19T09:00:00+01:00	2023-06-23T18:00:00+01:00	TWh	0.468711066	2.999933634	3.4686447	Planned Outage	Cavity 9 Annual Wellhead Maintenance	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_000000000000000000768_001	Dismissed	Unplanned	Storage unavailability	2023-06-24T08:10:17+01:00	2023-06-24T07:30:00+01:00	2023-06-26T18:00:00+01:00	TWh	0.48312084	2.5168128	3.4686447	Failure	Cavity 8	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_000000000000000000766_002	Inactive	Unplanned	Storage unavailability	2023-06-23T19:02:32+01:00	2023-06-21T07:53:00+01:00	2023-06-23T18:00:00+01:00	TWh	0.48312084	2.98552386	3.4686447	Failure	Cavity 8	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000766_001	Dismissed	Unplanned	Storage unavailability	2023-06-21T07:55:58+01:00	2023-06-21T07:53:00+01:00	2023-06-23T18:00:00+01:00	TWh	0.48312084	2.98552386	3.4686447	Failure	Cavity 8	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_000000000000000000765_002	Inactive	Unplanned	Storage unavailability	2023-06-08T16:55:19+01:00	2023-06-07T16:00:00+01:00	2023-06-08T16:40:00+01:00	TWh	0.555695	2.9129497	3.4686447	Failure	Cavity 7 wellhead panel	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000765_001	Dismissed	Unplanned	Storage unavailability	2023-06-07T16:09:37+01:00	2023-06-07T16:00:00+01:00	2023-06-09T18:00:00+01:00	TWh	0.555695	2.9129497	3.4686447	Failure	Cavity 7 wellhead panel	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000764_002	Inactive	Unplanned	Withdrawal unavailability	2023-06-07T15:19:59+01:00	2023-06-07T11:50:00+01:00	2023-06-07T15:00:00+01:00	GWh/d	130	0	130	Failure	.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000764_001	Dismissed	Unplanned	Withdrawal unavailability	2023-06-07T11:52:59+01:00	2023-06-07T11:50:00+01:00	2023-06-07T16:00:00+01:00	GWh/d	130	0	130	Failure	.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000762_002	Inactive	Unplanned	Storage unavailability	2023-06-06T15:36:51+01:00	2023-06-05T16:00:00+01:00	2023-06-06T15:25:00+01:00	TWh	0.3908	2.8395647	3.4686447	Failure	Atwick 3 WHP N2 Leak	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000762_001	Dismissed	Unplanned	Storage unavailability	2023-06-05T16:22:12+01:00	2023-06-05T16:00:00+01:00	2023-06-06T18:00:00+01:00	TWh	0.3908	2.8395647	3.4686447	Failure	Atwick 3 WHP N2 Leak	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000755_003	Inactive	Unplanned	Storage unavailability	2023-05-30T15:37:39+01:00	2023-05-27T13:36:00+01:00	2023-05-30T15:35:00+01:00	TWh	0.3908	3.0778447	3.4686447	Failure		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000755_002	Dismissed	Unplanned	Storage unavailability	2023-05-28T07:47:44+01:00	2023-05-27T13:36:00+01:00	2023-05-30T18:00:00+01:00	TWh	0.3908	3.0778447	3.4686447	Failure		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000755_001	Dismissed	Unplanned	Storage unavailability	2023-05-27T13:36:42+01:00	2023-05-27T13:36:00+01:00	2023-05-29T18:00:00+01:00	TWh	0.3908	3.0778447	3.4686447	Failure		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000754_002	Inactive	Unplanned	Storage unavailability	2023-05-25T14:47:07+01:00	2023-05-24T22:35:00+01:00	2023-05-25T14:45:00+01:00	TWh	0.317415066	3.151229634	3.4686447	Failure	.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000754_001	Dismissed	Unplanned	Storage unavailability	2023-05-24T22:38:19+01:00	2023-05-24T22:35:00+01:00	2023-05-25T15:00:00+01:00	TWh	0.317415066	3.151229634	3.4686447	Failure	.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000749_001	Active	Planned	Injection unavailability	2023-04-27T08:11:12+01:00	2026-07-01T05:00:00+01:00	2026-07-15T05:00:00+01:00	GWh/d	30	0	30	Planned Outage	Annual Full Site outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000748_001	Active	Planned	Withdrawal unavailability	2023-04-27T08:09:23+01:00	2026-07-01T05:00:00+01:00	2026-07-15T05:00:00+01:00	GWh/d	130	0	130	Planned Outage	Annual Full Site Outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000734_007	Inactive	Planned	Injection unavailability	2023-03-31T11:56:18+01:00	2023-03-30T08:00:00+01:00	2023-03-31T11:55:00+01:00	GWh/d	30	0	30	Planned Outage	USM	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000734_006	Dismissed	Planned	Injection unavailability	2023-03-30T18:03:45+01:00	2023-03-30T08:00:00+01:00	2023-03-31T16:00:00+01:00	GWh/d	30	0	30	Planned Outage	USM	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000734_005	Dismissed	Planned	Injection unavailability	2023-03-30T17:00:06+01:00	2023-03-30T08:00:00+01:00	2023-03-30T19:00:00+01:00	GWh/d	22.5	7.5	30	Planned Outage	USM	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000734_004	Dismissed	Planned	Injection unavailability	2023-03-30T14:58:51+01:00	2023-03-30T08:00:00+01:00	2023-03-30T17:00:00+01:00	GWh/d	22.5	7.5	30	Planned Outage	USM	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000734_003	Dismissed	Planned	Injection unavailability	2023-03-30T13:00:53+01:00	2023-03-30T08:00:00+01:00	2023-03-30T16:00:00+01:00	GWh/d	22.5	7.5	30	Planned Outage	USM	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000734_002	Dismissed	Planned	Injection unavailability	2023-03-24T15:02:36+00:00	2023-03-30T08:00:00+01:00	2023-03-30T16:00:00+01:00	GWh/d	30	0	30	Planned Outage	USM	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000734_001	Dismissed	Planned	Injection unavailability	2023-03-22T10:27:02+00:00	2023-03-29T08:00:00+01:00	2023-03-29T16:00:00+01:00	GWh/d	30	0	30	Planned Outage	USM	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000735_007	Inactive	Planned	Withdrawal unavailability	2023-03-31T11:55:42+01:00	2023-03-30T08:00:00+01:00	2023-03-31T11:55:00+01:00	GWh/d	130	0	130	Planned Outage	USM	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000735_006	Dismissed	Planned	Withdrawal unavailability	2023-03-30T18:03:03+01:00	2023-03-30T08:00:00+01:00	2023-03-31T16:00:00+01:00	GWh/d	130	0	130	Planned Outage	USM	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000735_005	Dismissed	Planned	Withdrawal unavailability	2023-03-30T17:00:26+01:00	2023-03-30T08:00:00+01:00	2023-03-30T19:00:00+01:00	GWh/d	120	10	130	Planned Outage	USM	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.