Official UK procurement notice
Moyle Interconnector Circuit Breaker Replacement Programme
Authority: MOYLE INTERCONNECTOR LIMITED (Public body)
Mutual Energy Limited (MEL) owns and operates energy infrastructure for the long-term benefit of energy consumers in Northern Ireland. Moyle Interconnector Limited (MIL) owns the 500MW High Voltage Direct Current (HVDC) Moyle Interconnector, commissioned in 2001, linking Northern Ireland and Scotland. It is a vital asset for Northern Ireland's electricity grid and provides support to Great Britain when required. The existing Siemens 3AQ2-EE circuit breakers were commissioned in 2001 and are approaching the stage at which significant refurbishment or replacement is required. Published service areas include: design, engineering, manufacture, supply, installation, testing and commissioning;; demonstration of compliance with the required electrical ratings and project-specific TRV duty;; controlled-switching and Point-on-Wave capability;; factory inspection and testing;; delivery and site logistics;; assessment of compatibility with existing foundations, structures, buswork, cabling…
What is being bought
Published requirement descriptionBackground
Mutual Energy Limited (MEL) owns and operates energy infrastructure for the long-term benefit of energy consumers in Northern Ireland. Moyle Interconnector Limited (MIL) owns the 500MW High Voltage Direct Current (HVDC) Moyle Interconnector, commissioned in 2001, linking Northern Ireland and Scotland. It is a vital asset for Northern Ireland's electricity grid and provides support to Great Britain when required
The Moyle Interconnector has seventeen 275 kV circuit breakers across its two converter stations. The existing Siemens 3AQ2-EE circuit breakers were commissioned in 2001 and are approaching the stage at which significant refurbishment or replacement is required.
Proposed Requirement
The proposed replacement programme is driven by the age, condition and maintenance requirements of the existing circuit breakers, together with the need to address project-specific requirements. The existing Siemens 3AQ2-EE circuit breakers are approaching their major refurbishment stage. The replacement programme also provides an opportunity to improve controlled energisation performance for the converter transformers through addition of suitable and Point-on-Wave switching capability.
The existing Moyle circuit breakers include equipment rated at 300 kV but incorporating 420 kV interrupters. Studies have identified a more onerous project-specific Transient Recovery Voltage (TRV) requirement associated with the low short-circuit ratio on the Scottish grid side of the converter. The replacement solution must meet this TRV duty and may require interrupters of a higher voltage class than the existing arrangements. Suppliers will be expected to propose a suitable solution and demonstrate compliance through appropriate studies, calculations and supporting test evidence.
The initial requirement is expected to comprise four converter pole circuit breakers, with two breakers at each converter station. MIL is also considering:
- the progressive replacement of up to thirteen additional filter, transmission line and busbar coupler circuit breakers.
- The anticipated scope includes:
- design, engineering, manufacture, supply, installation, testing and commissioning;
- demonstration of compliance with the required electrical ratings and project-specific TRV duty;
- controlled-switching and Point-on-Wave capability;
- factory inspection and testing;
- delivery and site logistics;
- assessment of compatibility with existing foundations, structures, buswork, cabling, protection and control systems;
- associated civil, structural, electrical, protection and control modifications; and
- training, recommended spares, specialist tools and through-life technical support.
The initial four circuit breakers are currently intended to be replaced during the planned summer outages in 2028 and 2029. The final scope, technical solution, procurement structure and allocation of responsibilities will be informed by this market engagement and remain subject to the relevant approvals.
NB The estimated contract dates included below are purely indicative as the notice requires dates to be included and they may move.
CPV: Circuit breakers
The lotProcurement structure
single lot · no lot value publishedPipeline intelligence · planning stage: how this market runs before the tender is published
How MOYLE INTERCONNECTOR LIMITED buys Electrical apparatus for switching or protecting electrical circuits (CPV 3121), and who usually turns up
MOYLE INTERCONNECTOR LIMITED has little published record in this market. Frameworks and DPS are left out: they draw different bid counts. Whole-market view: Electrical apparatus for switching or protecting electrical circuits (CPV 3121) →
How the contest usually goes
Winner shares use published awards; bid and price charts use contested lots.
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The counts under this question show how many awards have a known supplier size.
No small-firm winners recorded among this authority’s published awards in this sample.
i
Local means the winner is registered in the region where that award was delivered.
Most of this buyer’s recorded winners were registered outside the region where that award was delivered.
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Half of these awards have an award date within 42 days of the bid deadline.
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Both shares are minimums: some awards have no bid count.
Missing bid counts may hide more single-bid awards. This share is a minimum.
How many bids did past lots attract?
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1 bid29%
2–343%
4–624%
7+5%
How did awards compare with estimates?
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Below estimate13%
Within ±2%50%
Above estimate38%
Assess each lot i
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Open a lot for its forecast, this buyer’s previous supplier and possible competitors, from published award history, not a bid list
Lot #1CPV 3121Estimate not published
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Each lot shows its own forecast based on its own category; forecasts for different lots of the same notice are not comparative. The bar shows 21 past lots.
1 bid29%
2–343%
4–624%
7+5%
i
No comparable awards for this lot yet.
Who has supplied this buyer on similar work? i
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No earlier contract of this buyer matches this lot on the published record.
Who could compete for this lot? i
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Candidate suppliers for this notice have not been worked out yet, so this is not a verdict that nobody fits.
About this data
- Estimates, labelled. The price range, possible competitors and earlier-work matches are our estimates from past awards, not published facts, win chances or price advice. The buyer’s own record and the wider market are shown apart, never mixed.
- Source. Official UK public procurement notices (Find a Tender and Contracts Finder), reused under the Open Government Licence v3.0, updated through the day and rebuilt nightly. Not every figure uses both feeds, and each one shows how many records it rests on: see the methodology. Spotted something wrong? Tell us.
Coming up in this sector
Contracts ending within 12 months · Retender Radar, sector filter set
Procedure terms & legal framework
From the official record- Legal basis
- UKPGA · 2023/54 Procurement Act 2023
- Procurement category
- Goods
- Notice status
- Planned procurement
- Procurement threshold
- Above threshold (FTS publication)
- Regulatory regime
- Utilities
- Commercial structure
- Stand-alone contract (no framework)
- Competition type
- Competitive procedure
- GPA / WTO covered
- Unspecified in notice
- Recurring procurement
- Unspecified in notice
- First published
- 9 Nov 2026, 14:28 GMT
- Last source update
- 9 Nov 2026, 14:28 GMT
- FTS notice number
2026/S 000-106285- Latest notice
- Preliminary market engagement notice (UK2)
- Classification (CPV)
- Delivery area
- Official registry OCID
ocds-h6vhtk-07b7b5Find a Tender
How it was run
Official notice- Submission deadline
- —
Timeline
9 Nov 2026 → 1 Jan 2028 · 3 dates- Planning notice published4 days ago9 Nov 2026, 14:28 GMT
- Today14 Nov 2026
- Market engagementin 20 days4 Dec 2026, 23:59 GMT
MIL wishes to speak with organisations capable of providing all or part of the proposed requirements. Individual pre-market engagement meetings are expected to be held during the week commencing 30th November. Meetings may be held online or in person at MIL office in Belfast.
The meetings are intended to help MIL understand:
- available technical solutions and relevant supplier experience;
- compliance with the anticipated electrical ratings, project-specific TRV duty and controlled-switching requirements;
- manufacturing, delivery, installation and commissioning timescales;
- site interfaces, enabling works and outage requirements;
- appropriate contracting and delivery arrangements;
- ability to provide an integrated design, supply, installation and commissioning solution;
- appropriate packaging of the initial and potential future requirements;
- key technical, commercial and supply-chain risks; and
- high-level indicative costs and the principal factors affecting the overall project cost.
Indicative Cost Information
As part of the engagement, MIL intends to seek high-level, non-binding cost information to support budget development and procurement planning. Suppliers may be asked during or following the meeting to provide:
- an indicative cost or cost range for the design, manufacture and supply of the initial four pole circuit breakers;
- an indicative cost for installation, testing and commissioning;
- an indicative unit cost or cost range for additional circuit breakers;
- an indication of any significant enabling or interface costs;
- the principal assumptions, exclusions and cost drivers; and
- any potential economies associated with combining the initial and future requirements.
Any cost information provided will be used for budget development and procurement planning only. It will not constitute a tender or binding offer and will not form part of the evaluation of any future procurement.
How to Participate
Organisations wishing to participate should email [email protected] with the subject line “Moyle Circuit Breaker Market Engagement” no later than 25th November.
The email should include:
- organisational name;
- names and roles of the representatives wishing to attend;
- a brief summary of relevant experience and the elements of the requirement the organisation may be interested in providing;
- availability during the proposed engagement period; and
- whether an online or in-person meeting is preferred.
Meeting appointments will be confirmed by email, subject to availability. MIL reserves the right to amend the proposed dates or arrange alternative engagement meetings where required.
No detailed technical or commercial submission is required with the expression of interest. MIL may invite participating suppliers to provide relevant supporting information following the meeting.
Future Procurement
If the proposed procurement proceeds, tender documentation will be made available through the Find a Tender service and the Mutual Energy In-Tend portal. Potential tenderers should register on the In-Tend portal and monitor the relevant services for future notices and tender documentation.
In-Tend portal: in-tendhost.co.uk/mutual-energy/aspx/Home ↗
This preliminary market engagement is for information gathering purposes only and does not constitute a call for competition, invitation to tender or commitment to enter into a contract. Participation does not constitute a commitment to participate in any future procurement, and failure to participate will not prevent an organisation from responding to any subsequent procurement opportunity.
Contracting Entity
Moyle Interconnector Limited
First Floor, 85 Ormeau Road, Belfast, BT7 1SH, United Kingdom
Companies House number: NI036562
Contact email: [email protected]
Website: www.mutual-energy.com ↗
- Contract starts1 Jan 2028
Notice history
1 event · 1 release on Find a Tender- Preliminary market engagement notice published9 Nov 2026, 14:28 GMTUK2
Commercial outcome & contract awards
Pipeline notice- Awards (0)
- No award published
- Contracts (0)
- No contract published
- Bid statistics
- No aggregate bid statistics published
Contracting authority & participating public bodies
Official documents & specifications (1)
Official links; attachments are not copiedNotices published for this procedure
- Preliminary market engagement notice Preliminary market engagement notice on Find a Tender