Last update at: 2023-11-28T13:00:00+00:00

**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
< 1 2 3 4 5 >
Aldbrough	ALD_000000000000000000480_001	Dismissed	Planned	Withdrawal unavailability	2020-07-11T16:29:20+01:00	2024-05-12T05:00:00+01:00	2024-05-24T18:00:00+01:00	GWh/d	342.3	0	342.3	Planned Outage	Full Site Outage	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000479_005	Active	Planned	Injection unavailability	2023-11-01T08:19:18+00:00	2024-05-12T05:00:00+01:00	2024-05-26T18:00:00+01:00	GWh/d	311.56	0	311.56	Planned Outage	Full Site Outage.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000479_004	Dismissed	Planned	Injection unavailability	2023-07-25T08:42:49+01:00	2024-05-12T05:00:00+01:00	2024-05-21T18:00:00+01:00	GWh/d	311.56	0	311.56	Planned Outage	Full Site Outage.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000479_003	Dismissed	Planned	Injection unavailability	2020-09-20T09:03:10+01:00	2024-05-12T05:00:00+01:00	2024-05-21T18:00:00+01:00	GWh/d	311.56	0	311.56	Planned Outage	Full Site Outage	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000479_002	Dismissed	Planned	Injection unavailability	2020-09-20T08:57:21+01:00	2024-05-12T05:00:00+01:00	2024-05-21T09:00:00+01:00	GWh/d	311.56	0	311.56	Planned Outage	Full Site Outage	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000479_001	Dismissed	Planned	Injection unavailability	2020-07-11T16:25:45+01:00	2024-05-12T05:00:00+01:00	2024-05-24T18:00:00+01:00	GWh/d	311.56	0	311.56	Planned Outage	Full Site Outage	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000832_002	Inactive	Unplanned	Injection unavailability	2023-10-30T18:07:12+00:00	2023-10-30T13:15:00+00:00	2023-10-30T17:15:00+00:00	GWh/d	311.56	0	311.56	Planned Outage	SSSV testing.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000832_001	Dismissed	Unplanned	Injection unavailability	2023-10-30T13:21:50+00:00	2023-10-30T13:15:00+00:00	2023-10-30T17:15:00+00:00	GWh/d	311.56	0	311.56	Planned Outage	SSSV testing.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000833_002	Inactive	Unplanned	Withdrawal unavailability	2023-10-30T18:06:47+00:00	2023-10-30T13:15:00+00:00	2023-10-30T17:15:00+00:00	GWh/d	342.3	0	342.3	Planned Outage	SSSV testing.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000833_001	Dismissed	Unplanned	Withdrawal unavailability	2023-10-30T13:23:05+00:00	2023-10-30T13:15:00+00:00	2023-10-30T17:15:00+00:00	GWh/d	342.3	0	342.3	Planned Outage	SSSV testing.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000822_006	Inactive	Planned	Injection unavailability	2023-10-29T16:12:12+00:00	2023-10-28T05:00:00+01:00	2023-10-29T16:00:00+00:00	GWh/d	111.02	200.54	311.56	Planned Outage	Siemens electrical maintenance	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000822_005	Dismissed	Planned	Injection unavailability	2023-10-29T13:34:03+00:00	2023-10-28T05:00:00+01:00	2023-10-29T16:00:00+00:00	GWh/d	111.02	200.54	311.56	Planned Outage	Siemens electrical maintenance	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000822_004	Dismissed	Planned	Injection unavailability	2023-10-29T11:08:05+00:00	2023-10-28T05:00:00+01:00	2023-10-29T14:00:00+00:00	GWh/d	111.02	200.54	311.56	Planned Outage	Siemens electrical maintenance	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000822_003	Dismissed	Planned	Injection unavailability	2023-10-28T20:37:08+01:00	2023-10-28T05:00:00+01:00	2023-10-29T12:00:00+00:00	GWh/d	111.02	200.54	311.56	Planned Outage	Siemens electrical maintenance	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000822_002	Dismissed	Planned	Injection unavailability	2023-10-28T17:54:42+01:00	2023-10-28T05:00:00+01:00	2023-10-28T22:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	Siemens electrical maintenance	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000822_001	Dismissed	Planned	Injection unavailability	2023-10-18T14:11:06+01:00	2023-10-28T05:00:00+01:00	2023-10-28T18:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	Siemens electrical maintenance	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000831_002	Inactive	Unplanned	Withdrawal unavailability	2023-10-29T15:24:04+00:00	2023-10-29T12:45:00+00:00	2023-10-29T15:22:00+00:00	GWh/d	130	0	130	Failure	Unavailable for withdrawal	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000831_001	Dismissed	Unplanned	Withdrawal unavailability	2023-10-29T12:55:02+00:00	2023-10-29T12:45:00+00:00	2023-10-29T18:00:00+00:00	GWh/d	130	0	130	Failure	Unavailable for withdrawal	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000478_002	Inactive	Planned	Injection unavailability	2023-10-27T23:16:53+01:00	2023-10-23T05:00:00+01:00	2023-10-27T23:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	Comp 3 Outage	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000478_001	Dismissed	Planned	Injection unavailability	2020-07-11T16:22:41+01:00	2023-10-23T05:00:00+01:00	2023-10-28T05:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	Comp 3 Outage	21YGB-UKGASGRIDW	55WALDBOROUGH00H	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_000000000000000000828_002	Dismissed	Planned	Withdrawal unavailability	2023-10-21T11:02:55+01:00	2024-08-31T05:00:00+01:00	2024-09-29T18:00:00+01:00	GWh/d	30	100	130	Planned Outage	Vortisep outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000828_001	Dismissed	Planned	Withdrawal unavailability	2023-10-21T10:59:07+01:00	2024-08-31T05:00:00+01:00	2024-09-29T18:00:00+01:00	GWh/d	30	100	130	Planned Outage	Vortisep outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000829_001	Active	Planned	Withdrawal unavailability	2023-10-21T11:00:57+01:00	2024-08-31T05:00:00+01:00	2024-09-29T18:00:00+01:00	GWh/d	30	100	130	Planned Outage	Vortisep outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000477_003	Inactive	Planned	Injection unavailability	2023-10-21T06:02:31+01:00	2023-10-16T05:00:00+01:00	2023-10-21T05:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	Comp 2 Outage	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000477_002	Dismissed	Planned	Injection unavailability	2021-06-30T10:43:14+01:00	2023-10-16T05:00:00+01:00	2023-10-21T05:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	Comp 2 Outage	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000477_001	Dismissed	Planned	Injection unavailability	2020-07-11T16:17:27+01:00	2023-10-16T05:00:00+01:00	2023-10-21T05:00:00+01:00	GWh/d	0	311.56	311.56	Planned Outage	Comp 2 Outage	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000827_001	Active	Planned	Withdrawal unavailability	2023-10-20T20:21:46+01:00	2024-07-23T05:00:00+01:00	2024-08-06T18:00:00+01:00	GWh/d	96.67	33.33	130	Planned Outage	Phase 6 - outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000826_001	Active	Planned	Withdrawal unavailability	2023-10-20T20:13:14+01:00	2024-06-28T05:00:00+01:00	2024-07-23T05:00:00+01:00	GWh/d	130	0	130	Planned Outage	Full site outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000825_001	Active	Planned	Injection unavailability	2023-10-20T20:09:26+01:00	2024-06-28T05:00:00+01:00	2024-07-23T05:00:00+01:00	GWh/d	30	0	30	Planned Outage	Full site outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000824_001	Active	Planned	Withdrawal unavailability	2023-10-20T19:56:33+01:00	2024-06-19T05:00:00+01:00	2024-06-28T05:00:00+01:00	GWh/d	48.33	81.67	130	Planned Outage	stream 8 - outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000823_001	Active	Planned	Withdrawal unavailability	2023-10-20T19:45:15+01:00	2024-06-01T05:00:00+01:00	2024-06-11T18:00:00+01:00	GWh/d	48.33	81.67	130	Planned Outage	Stream 7 - outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000499_002	Dismissed	Planned	Withdrawal unavailability	2023-10-20T17:32:15+01:00	2024-07-15T05:00:00+01:00	2024-08-01T00:00:00+01:00	GWh/d	96.67	33.33	130	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000499_001	Dismissed	Planned	Withdrawal unavailability	2020-07-28T14:14:38+01:00	2024-07-15T05:00:00+01:00	2024-08-01T00:00:00+01:00	GWh/d	96.67	33.33	130	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000495_002	Dismissed	Planned	Injection unavailability	2023-10-20T17:28:55+01:00	2024-07-01T05:00:00+01:00	2024-07-15T05:00:00+01:00	GWh/d	30	0	30	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000495_001	Dismissed	Planned	Injection unavailability	2020-07-12T00:14:47+01:00	2024-07-01T05:00:00+01:00	2024-07-15T05:00:00+01:00	GWh/d	30	0	30	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000498_003	Dismissed	Planned	Withdrawal unavailability	2023-10-20T17:25:46+01:00	2024-07-01T05:00:00+01:00	2024-07-15T05:00:00+01:00	GWh/d	130	0	130	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000498_002	Dismissed	Planned	Withdrawal unavailability	2020-07-28T17:58:18+01:00	2024-07-01T05:00:00+01:00	2024-07-15T05:00:00+01:00	GWh/d	130	0	130	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000498_001	Dismissed	Planned	Withdrawal unavailability	2020-07-28T14:11:39+01:00	2020-07-01T05:00:00+01:00	2024-07-15T05:00:00+01:00	GWh/d	130	0	130	Planned Outage		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_000000000000000000819_002	Inactive	Planned	Storage unavailability	2023-10-18T16:41:38+01:00	2023-10-18T09:00:00+01:00	2023-10-19T16:30:00+01:00	TWh	0.48312084	2.98552386	3.4686447	Planned Outage	Cavity 8 - 6 Monthly Wellhead maintenance.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000819_001	Dismissed	Planned	Storage unavailability	2023-10-05T13:33:30+01:00	2023-10-18T09:00:00+01:00	2023-10-19T18:00:00+01:00	TWh	0.48312084	2.98552386	3.4686447	Planned Outage	Cavity 8 - 6 Monthly Wellhead maintenance.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000818_002	Inactive	Planned	Storage unavailability	2023-10-17T19:26:22+01:00	2023-10-17T09:00:00+01:00	2023-10-17T19:24:00+01:00	TWh	0.317415066	3.151229634	3.4686447	Planned Outage	Cavity 7 - 6 Monthly wellhead maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000818_001	Dismissed	Planned	Storage unavailability	2023-10-05T13:29:41+01:00	2023-10-17T09:00:00+01:00	2023-10-18T18:00:00+01:00	TWh	0.317415066	3.151229634	3.4686447	Planned Outage	Cavity 7 - 6 Monthly wellhead maintenance	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_000000000000000000804_002	Inactive	Planned	Withdrawal unavailability	2023-10-10T15:42:19+01:00	2023-10-10T08:00:00+01:00	2023-10-10T15:41:00+01:00	GWh/d	130	0	130	Planned Outage	Withdrawal - USM Validations(Day 2)	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000804_001	Dismissed	Planned	Withdrawal unavailability	2023-09-05T09:58:44+01:00	2023-10-10T08:00:00+01:00	2023-10-10T17:00:00+01:00	GWh/d	130	0	130	Planned Outage	Withdrawal - USM Validations(Day 2)	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.