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
< 2 3 4 5 6 >
Aldbrough	ALD_000000000000000000772_004	Dismissed	Planned	Storage unavailability	2023-09-13T09:51:24+01:00	2023-09-12T06:00:00+01:00	2023-09-14T05:00:00+01:00	TWh	0.4123	2.7498642	3.1621642	Planned Outage	Loss of Ald 3 WHM	21YGB-UKGASGRIDW	55WALDBOROUGH00H	SSE Hornsea Ltd	A0001033U.UK
Aldbrough	ALD_000000000000000000772_003	Dismissed	Planned	Storage unavailability	2023-08-30T15:28:22+01:00	2023-09-12T06:00:00+01:00	2023-09-22T18:00:00+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_000000000000000000772_002	Dismissed	Planned	Storage unavailability	2023-08-23T09:12:19+01:00	2023-09-10T06:00:00+01:00	2023-09-22T18:00:00+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_000000000000000000772_001	Dismissed	Planned	Storage unavailability	2023-07-05T15:27:29+01:00	2023-09-12T06:00:00+01:00	2023-09-24T18:00:00+01:00	TWh	0.412	2.8872861	3.2992861	Planned Outage	Loss of Ald 3	21YGB-UKGASGRIDW	55WALDBOROUGH00H	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_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_000000000000000000787_002	Inactive	Planned	Withdrawal unavailability	2023-08-30T16:30:45+01:00	2023-08-30T08:00:00+01:00	2023-08-30T16:15:00+01:00	GWh/d	130	0	130	Planned Outage	Chromatograph works	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000787_001	Dismissed	Planned	Withdrawal unavailability	2023-07-21T07:53:47+01:00	2023-08-30T08:00:00+01:00	2023-09-01T18:00:00+01:00	GWh/d	130	0	130	Planned Outage	Chromatograph works	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000798_002	Inactive	Planned	Injection unavailability	2023-08-30T16:27:14+01:00	2023-08-30T09:50:00+01:00	2023-08-30T16:15:00+01:00	GWh/d	0	30	30	Planned Outage	ESD testing	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000798_001	Dismissed	Planned	Injection unavailability	2023-08-30T09:48:05+01:00	2023-08-30T09:50:00+01:00	2023-08-30T18:00:00+01:00	GWh/d	0	30	30	Planned Outage	ESD testing	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000790_002	Dismissed	Planned	Injection unavailability	2023-08-30T09:46:25+01:00	2023-08-31T08:00:00+01:00	2023-08-31T16:00:00+01:00	GWh/d	30	0	30	Planned Outage	ESD Testing	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000790_001	Dismissed	Planned	Injection unavailability	2023-08-01T09:18:34+01:00	2023-08-31T08:00:00+01:00	2023-08-31T16:00:00+01:00	GWh/d	30	0	30	Planned Outage	ESD Testing	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000784_003	Inactive	Planned	Storage unavailability	2023-08-25T06:02:32+01:00	2023-07-31T05:00:00+01:00	2023-08-25T04:59:00+01:00	TWh	0.317415066	3.151229634	3.4686447	Planned Outage	Cavity 7 Intervention Works	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000784_002	Dismissed	Planned	Storage unavailability	2023-07-19T16:54:44+01:00	2023-07-31T05:00:00+01:00	2023-08-25T04:59:00+01:00	TWh	0.317415066	3.151229634	3.4686447	Planned Outage	Cavity 7 Intervention Works	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000784_001	Dismissed	Planned	Storage unavailability	2023-07-17T12:03:37+01:00	2023-07-24T05:00:00+01:00	2023-08-18T18:00:00+01:00	TWh	0.317415066	3.151229634	3.4686447	Planned Outage	Cavity 7 Intervention Works	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_000000000000000000785_002	Dismissed	Planned	Storage unavailability	2023-08-17T13:50:19+01:00	2023-08-25T05:00:00+01:00	2023-09-19T18:00:00+01:00	TWh	0.48312084	2.98552386	3.4686447	Planned Outage	Cavity 8 Intervention works	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000785_001	Dismissed	Planned	Storage unavailability	2023-07-17T12:08:57+01:00	2023-08-25T05:00:00+01:00	2023-09-19T18:00:00+01:00	TWh	0.48312084	2.98552386	3.4686447	Planned Outage	Cavity 8 Intervention works	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000788_003	Inactive	Planned	Withdrawal unavailability	2023-08-15T07:21:49+01:00	2023-07-21T15:16:00+01:00	2023-08-15T07:21:00+01:00	GWh/d	30	70	130	Planned Outage	.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000788_002	Dismissed	Planned	Withdrawal unavailability	2023-07-21T15:36:15+01:00	2023-07-21T15:16:00+01:00	2024-06-01T05:00:00+01:00	GWh/d	30	70	130	Planned Outage	.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000788_001	Dismissed	Planned	Withdrawal unavailability	2023-07-21T15:24:47+01:00	2023-07-21T15:16:00+01:00	2024-06-01T05:00:00+01:00	GWh/d	30	70	130	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000789_004	Inactive	Planned	Withdrawal unavailability	2023-08-01T16:06:37+01:00	2023-08-01T05:00:00+01:00	2023-08-01T16:05:00+01:00	GWh/d	130	0	130	Planned Outage	Fuel Gas pipework repair.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000789_003	Dismissed	Planned	Withdrawal unavailability	2023-07-27T11:20:37+01:00	2023-08-01T05:00:00+01:00	2023-08-01T18:00:00+01:00	GWh/d	130	0	130	Planned Outage	Fuel Gas pipework repair.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000789_002	Dismissed	Planned	Withdrawal unavailability	2023-07-27T11:18:44+01:00	2023-08-01T05:00:00+01:00	2023-08-01T18:00:00+01:00	GWh/d	100	0	130	Planned Outage	Fuel Gas pipework repair.	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000789_001	Dismissed	Planned	Withdrawal unavailability	2023-07-27T11:12:08+01:00	2023-08-01T05:00:00+01:00	2023-08-01T18:00:00+01:00	GWh/d	70	0	130	Planned Outage	Fuel Gas pipework repair.	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_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_000000000000000000492_003	Inactive	Planned	Injection unavailability	2023-07-17T05:46:11+01:00	2023-06-30T05:00:00+01:00	2023-07-17T05:00:00+01:00	GWh/d	30	0	30	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000492_002	Dismissed	Planned	Injection unavailability	2023-02-24T11:55:28+00:00	2023-06-30T05:00:00+01:00	2023-07-17T05:00:00+01:00	GWh/d	30	0	30	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000492_001	Dismissed	Planned	Injection unavailability	2020-07-11T23:11:57+01:00	2023-07-01T05:00:00+01:00	2023-07-15T05:00:00+01:00	GWh/d	30	0	30	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000493_004	Inactive	Planned	Withdrawal unavailability	2023-07-17T05:45:47+01:00	2023-06-30T05:00:00+01:00	2023-07-17T05:00:00+01:00	GWh/d	130	0	130	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000493_003	Dismissed	Planned	Withdrawal unavailability	2023-02-24T11:56:39+00:00	2023-06-30T05:00:00+01:00	2023-07-17T05:00:00+01:00	GWh/d	130	0	130	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000493_002	Dismissed	Planned	Withdrawal unavailability	2020-07-28T13:48:32+01:00	2023-07-01T05:00:00+01:00	2023-07-15T05:00:00+01:00	GWh/d	130	0	130	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000493_001	Dismissed	Planned	Withdrawal unavailability	2020-07-11T23:13:18+01:00	2023-07-01T05:00:00+01:00	2023-07-08T05:00:00+01:00	GWh/d	130	0	130	Planned Outage		21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000750_002	Inactive	Planned	Withdrawal unavailability	2023-07-17T05:45:10+01:00	2027-07-01T05:00:00+01:00	2027-07-15T05:00:00+01:00	GWh/d	130	0	130	Planned Outage	Annual Full Site Outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000750_001	Dismissed	Planned	Withdrawal unavailability	2023-04-27T08:13:14+01:00	2027-07-01T05:00:00+01:00	2027-07-15T05:00:00+01:00	GWh/d	130	0	130	Planned Outage	Annual Full Site Outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000751_002	Inactive	Planned	Injection unavailability	2023-07-17T05:44:50+01:00	2027-07-01T05:00:00+01:00	2027-07-15T05:00:00+01:00	GWh/d	30	0	30	Planned Outage	Annual Full Site Outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_000000000000000000751_001	Dismissed	Planned	Injection unavailability	2023-04-27T08:14:31+01:00	2027-07-01T05:00:00+01:00	2027-07-15T05:00:00+01:00	GWh/d	30	0	30	Planned Outage	Annual Full Site Outage	21YGB-UKGASGRIDW	55WATWICK-SSE00J	SSE Hornsea Ltd	A0001033U.UK
Atwick	ATW_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
Atwick	ATW_000000000000000000759_001	Dismissed	Planned	Storage unavailability	2023-05-30T09:23:28+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
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

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.