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 >
Atwick	ATW_000000000000000000849_002	Active	Unplanned	Withdrawal unavailability	2023-11-28T12:52:13+00:00	2023-11-28T12:48:00+00:00	2023-12-19T18:00:00+00:00	GWh/d	50	80	130	Failure	Stream 7	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000865_001	Active	Planned	Injection unavailability	2023-11-28T09:32:01+00:00	2026-10-24T05:00:00+01:00	2026-10-24T18:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	GC- Siemens maintenance.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000864_001	Active	Planned	Injection unavailability	2023-11-28T09:29:35+00:00	2026-10-25T05:00:00+00:00	2026-11-08T18:00:00+00:00	GWh/d	111.02	200.54	311.56	Planned Outage	GC-3 outage.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000863_001	Active	Planned	Injection unavailability	2023-11-28T09:26:33+00:00	2026-10-19T05:00:00+01:00	2026-10-23T18:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	GC-2 outage.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000862_001	Active	Planned	Injection unavailability	2023-11-28T09:23:56+00:00	2026-10-12T05:00:00+01:00	2026-10-16T18:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	GC-1 outage.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000861_001	Active	Planned	Withdrawal unavailability	2023-11-28T09:20:21+00:00	2026-05-30T05:00:00+01:00	2026-06-14T18:00:00+01:00	GWh/d	121.5	220.8	342.3	Planned Outage	Production train 1 outage.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000860_001	Active	Planned	Withdrawal unavailability	2023-11-28T09:17:51+00:00	2026-05-02T05:00:00+01:00	2026-05-09T05:00:00+01:00	GWh/d	121.5	220.8	342.3	Planned Outage	Production train 2 outage.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000859_001	Active	Planned	Withdrawal unavailability	2023-11-28T09:12:48+00:00	2026-05-09T05:00:00+01:00	2026-05-24T18:00:00+01:00	GWh/d	342.3	0	342.3	Planned Outage	Full outage. Withdrawal.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000858_001	Active	Planned	Injection unavailability	2023-11-28T09:07:13+00:00	2026-05-09T05:00:00+01:00	2026-05-24T18:00:00+01:00	GWh/d	311.56	0	311.56	Planned Outage	Full outage. Injection.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000857_001	Active	Planned	Injection unavailability	2023-11-27T14:25:31+00:00	2025-10-27T05:00:00+00:00	2025-10-27T18:00:00+00:00	GWh/d	111.02	200.54	311.56	Planned Outage	GC-1. Siemens Maintenance.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000856_001	Active	Planned	Injection unavailability	2023-11-27T14:23:04+00:00	2025-10-28T05:00:00+00:00	2025-11-11T18:00:00+00:00	GWh/d	111.02	200.54	311.56	Planned Outage	GC-3. Level 3.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000855_001	Active	Planned	Injection unavailability	2023-11-27T14:21:39+00:00	2025-10-20T05:00:00+01:00	2025-10-26T18:00:00+00:00	GWh/d	111.02	200.54	311.56	Planned Outage	GC-2. Level 2.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000854_001	Active	Planned	Injection unavailability	2023-11-27T14:20:09+00:00	2025-10-13T05:00:00+01:00	2025-10-17T18:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	GC-1 Level 1.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000853_001	Active	Planned	Withdrawal unavailability	2023-11-27T13:17:17+00:00	2025-05-04T05:00:00+01:00	2025-05-10T05:00:00+01:00	GWh/d	121.5	220.8	342.3	Planned Outage	Production train 2 outage.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000852_001	Active	Planned	Withdrawal unavailability	2023-11-27T13:13:23+00:00	2025-05-10T05:00:00+01:00	2025-06-14T18:00:00+01:00	GWh/d	342.3	0	342.3	Planned Outage	Full site outage. Withdrawal.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000851_001	Active	Planned	Injection unavailability	2023-11-27T13:10:39+00:00	2025-05-10T05:00:00+01:00	2025-06-14T18:00:00+01:00	GWh/d	311.56	0	311.56	Planned Outage	Full site outage. Injection.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000791_007	Active	Planned	Withdrawal unavailability	2023-11-23T09:43:25+00:00	2023-12-19T18:00:00+00:00	2024-06-01T05:00:00+01:00	GWh/d	30	100	130	Planned Outage	Phase 6 reduction	21YGB-UKGASGRIDW	55WATWICK-SSE00J	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
Aldbrough	ALD_000000000000000000842_001	Active	Planned	Storage unavailability	2023-11-13T10:03:43+00:00	2024-07-01T05:00:00+01:00	2024-12-31T05:00:00+00:00	TWh	0.412	2.7501642	3.1621642	Planned Outage	Cavern 1. Removed from service AHS.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000483_005	Active	Planned	Injection unavailability	2023-11-10T08:26:00+00:00	2024-10-27T05:00:00+00:00	2024-11-09T18:00:00+00:00	GWh/d	111.02	200.54	311.56	Planned Outage	Comp 1 Outage. L3	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000834_002	Active	Planned	Injection unavailability	2023-11-10T08:09:26+00:00	2024-10-26T05:00:00+01:00	2024-10-26T18:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	Gas compressor 3. Siemens maintenance	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000484_005	Active	Planned	Injection unavailability	2023-11-10T08:06:56+00:00	2024-10-21T05:00:00+01:00	2024-10-25T18:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	Comp 2 Outage. L1	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000481_003	Active	Planned	Withdrawal unavailability	2023-11-01T08:59:38+00:00	2024-06-01T05:00:00+01:00	2024-06-18T18:00:00+01:00	GWh/d	121.5	220.8	342.3	Planned Outage	Prod Train 1 Outage.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000482_003	Active	Planned	Withdrawal unavailability	2023-11-01T08:58:13+00:00	2024-05-05T05:00:00+01:00	2024-05-27T18:00:00+01:00	GWh/d	121.5	220.8	342.3	Planned Outage	Prod Train 2 Outage.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000485_003	Active	Planned	Injection unavailability	2023-11-01T08:33:49+00:00	2024-10-14T05:00:00+01:00	2024-10-18T18:00:00+01:00	GWh/d	111.02	200.54	311.56	Planned Outage	Comp 3 Outage. L1	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000480_004	Active	Planned	Withdrawal unavailability	2023-11-01T08:20:00+00:00	2024-05-12T05:00:00+01:00	2024-05-26T18:00:00+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
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
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
Aldbrough	ALD_000000000000000000795_001	Active	Unplanned	Storage unavailability	2023-08-21T14:49:04+01:00	2024-09-02T05:00:00+01:00	2024-10-11T18:00:00+01:00	TWh	0.4123	2.7498642	3.1621642	Planned Outage	Loss of Ald 3.	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000794_001	Active	Unplanned	Storage unavailability	2023-08-21T14:43:47+01:00	2024-05-02T05:00:00+01:00	2024-06-11T18:00:00+01:00	TWh	0.4123	2.7498642	3.1621642	Planned Outage	Loss of Ald 3	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000782_001	Active	Planned	Withdrawal unavailability	2023-07-17T07:49:13+01:00	2027-07-01T05:00:00+01:00	2027-07-15T05:00:00+01:00	GWh/d	130	0	130	Planned Outage	2027 full site outage (Withdrawal)	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000781_001	Active	Planned	Injection unavailability	2023-07-17T07:45:35+01:00	2027-07-01T05:00:00+01:00	2027-07-15T05:00:00+01:00	GWh/d	30	0	30	Planned Outage	2027 Full Site outage (Injection)	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_000000000000000000747_001	Active	Planned	Injection unavailability	2023-04-27T08:07:00+01:00	2025-07-01T05:00:00+01:00	2025-07-15T05:00:00+01:00	GWh/d	30	0	30	Planned Outage	Annual Full Site outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000746_001	Active	Planned	Withdrawal unavailability	2023-04-27T08:04:47+01:00	2025-07-01T05:00:00+01:00	2025-07-15T05:00:00+01:00	GWh/d	130	0	130	Planned Outage	Annual Full site Outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000849_001	Dismissed	Unplanned	Withdrawal unavailability	2023-11-23T09:42:48+00:00	2023-11-28T18:00:00+00:00	2023-12-19T18:00:00+00:00	GWh/d	50	80	130	Failure	Stream 7	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000848_001	Dismissed	Planned	Withdrawal unavailability	2023-11-23T09:39:42+00:00	2023-11-27T14:00:00+00:00	2023-11-28T18:00:00+00:00	GWh/d	100	30	130	Planned Outage	Regen Heater (Continuation)	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000846_001	Dismissed	Planned	Injection unavailability	2023-11-23T09:33:13+00:00	2023-11-27T10:00:00+00:00	2023-11-27T14:00:00+00:00	GWh/d	30	0	30	Planned Outage	.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000847_001	Dismissed	Planned	Withdrawal unavailability	2023-11-23T09:34:15+00:00	2023-11-27T10:00:00+00:00	2023-11-27T14:00:00+00:00	GWh/d	130	0	130	Planned Outage	.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000840_002	Dismissed	Planned	Withdrawal unavailability	2023-11-23T09:35:32+00:00	2023-11-18T05:00:00+00:00	2023-11-27T10:00:00+00:00	GWh/d	100	30	130	Planned Outage	Regen Heater Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000840_001	Dismissed	Planned	Withdrawal unavailability	2023-11-10T17:54:08+00:00	2023-11-18T05:00:00+00:00	2023-11-28T18:00:00+00:00	GWh/d	100	30	130	Planned Outage	Regen Heater Maintenance	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000850_002	Dismissed	Unplanned	Withdrawal unavailability	2023-11-27T07:14:03+00:00	2023-11-27T00:10:00+00:00	2023-11-27T10:00:00+00:00	GWh/d	130	0	130	Failure	H2S	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000850_001	Dismissed	Unplanned	Withdrawal unavailability	2023-11-27T00:21:50+00:00	2023-11-27T00:10:00+00:00	2023-11-27T12:00:00+00:00	GWh/d	130	0	130	Failure	H2S	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000844_001	Dismissed	Planned	Injection unavailability	2023-11-15T10:33:20+00:00	2023-11-23T12:00:00+00:00	2023-11-23T16:00:00+00:00	GWh/d	311.56	0	311.56	Planned Outage	PCS download	21YGB-UKGASGRIDW	55WALDBOROUGH00H	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.