Find a TenderPlanned procurementPreliminary market engagement notice
Published 9 Nov 2026, 14:28 GMT

Official UK procurement notice

Moyle Interconnector Circuit Breaker Replacement Programme

Authority: MOYLE INTERCONNECTOR LIMITED (Public body)

GoodsAbove thresholdUtilities
Planned pipeline valueValue not publishedpipeline notice, not a live tender
Tender notice expected Date not publishedfrom the planned procurement notice
Contract term 5 yrsends 31 Dec 2032 · starts 1 Jan 2028
Notice summaryFrom the published notice

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 description

Background

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 published
Lot #1Planned 5 yrs
Contract period: 1 Jan 2028 – 31 Dec 2032 (5 yrs)

Who is likely to bid for this lot ↓

Pipeline 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) →

1

How the contest usually goes

Winner shares use published awards; bid and price charts use contested lots.

Question for the bid
This buyerMOYLE INTERCONNECTOR LIMITED · all categories
What to do with it
How often do SMEs win?
i

The counts under this question show how many awards have a known supplier size.

Buyer: 0 of 1 known-size awards · market: CPV 3121 · UK-wide, n=25
0 of 144%

No small-firm winners recorded among this authority’s published awards in this sample.

How often do local suppliers win?
i

Local means the winner is registered in the region where that award was delivered.

Buyer: 0 of 1 known-location awards · market: CPV 3121 · UK-wide, n=9
0 of 133%

Most of this buyer’s recorded winners were registered outside the region where that award was delivered.

How long to a decision?
i
Buyer: no decision dates published · market: division 31 · Northern Ireland, n=9
—42 days

Half of these awards have an award date within 42 days of the bid deadline.

How often single-bid or direct?
i

Both shares are minimums: some awards have no bid count.

Buyer: at least 0 of 1 procurements with awards had no recorded rival · market: CPV 3121 · UK-wide, n=33
0 of 167%

Missing bid counts may hide more single-bid awards. This share is a minimum.

How many bids did past lots attract?

i
This buyerNo bid counts published
The market21 lots with bid counts · division 31 · Northern Ireland
29% had one bid
% of the market's 21 lots with a published bid count · select a colour for counts
1 bid29%
Market: 6 of 21 lots with published bid counts.
2–343%
Market: 9 of 21 lots with published bid counts.
4–624%
Market: 5 of 21 lots with published bid counts.
7+5%
Market: 1 of 21 lots with published bid counts.

How did awards compare with estimates?

i
This buyerNo estimate-and-award pairs published
The market8 lots with estimate and award · division 31 · Northern Ireland
13% below estimate
% of the market's 8 lots with an estimate and award · select a colour for counts
Below estimate13%
Market: 1 of 8 lots with an estimate and award.
Within ±2%50%
Market: 4 of 8 lots with an estimate and award.
Above estimate38%
Market: 3 of 8 lots with an estimate and award.
2

Assess each lot
i

Open a lot for its forecast, this buyer’s previous supplier and possible competitors, from published award history, not a bid list

Lot #1CPV 312160 monthsEstimate not published
Expected competition
i

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.

—No model forecast yet29% chance of a single bid
Past bids on 21 similar lots
1 bid29%
6 of 21 similar past lots received 1 bid (29%).
2–343%
9 of 21 similar past lots received 2–3 (43%).
4–624%
5 of 21 similar past lots received 4–6 (24%).
7+5%
1 of 21 similar past lots received 7+ (5%).
Comparable past lots usually drew 2 bids.
Commercial price forecast
i

No comparable awards for this lot yet.

—Estimate not published
The buyer published no estimate for this lot, so there is nothing to forecast against. A price prediction here would be a number about a number we do not have.

Who has supplied this buyer on similar work?
i

No earlier contract of this buyer matches this lot on the published record.

Who could compete for this lot?
i

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)
Circuit breakers
Delivery area
Northern Ireland (UKN)
Official registry OCID
ocds-h6vhtk-07b7b5 Find a Tender

How it was run

Official notice
Submission deadline
—

Timeline

9 Nov 2026 → 1 Jan 2028 · 3 dates
  1. Planning notice published4 days ago
    9 Nov 2026, 14:28 GMT
  2. Today
    14 Nov 2026
  3. Market engagementin 20 days
    4 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 ↗

  4. Contract starts
    1 Jan 2028

Notice history

1 event · 1 release on Find a Tender
  1. Preliminary market engagement notice published
    9 Nov 2026, 14:28 GMT
    UK2

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

MOYLE INTERCONNECTOR LIMITED

Contracting authorityPrivate utility GB-COH: NI036562 · GB-PPON: PVGR-7354-RZGL First Floor, The Arena Building, 85 Ormeau Road, Northern Ireland, BT7 1SHContact email

Official documents & specifications (1)

Official links; attachments are not copied

Notices published for this procedure