Official UK procurement notice
Maentwrog Hydro Power Station Optimisation Services
Authority: Nuclear Decommissioning Authority (Central government)
What is being bought
Published requirement descriptionNDA is a non-departmental public body charged, on behalf of government, with the mission to clean-up the UK’s earliest nuclear sites safely, securely and cost effectively. We’re committed to overcoming the challenges of nuclear clean-up and decommissioning, leaving the 17 nuclear sites ready for their next use. We do this work with care for our people, communities and the environment, with safety, as always, our number one priority. We also play an important role in supporting government’s aspiration for the UK to be a global leader in the civil nuclear sector. We strive to deliver best value for the UK taxpayer by focusing on reducing the highest hazards and risks, while ensuring safe, secure, and environmentally responsible operations at our sites. We seek ways to reduce the level of public funding from government by generating revenue through our commercial activities.
Maentwrog Hydroelectric Power Station (“Maentwrog”) is a 28MW hydroelectric plant owned by NDA and operated by Magnox Limited (“Magnox”).
The NDA is seeking to engage with economic operators obtain feedback regarding a forthcoming tender to appoint an economic operator to deliver energy generation and trading optimisation services for the NDA's Maentwrog Hydropower station asset. The core service to be delivered includes, but is not limited to the provision of trading available energy generation capacity within the wholesale market, based upon fundamental and technical analysis, market expertise and available generation capacity based upon water volumes, rainfall and available measurements within defined operational parameters.
The aim of this procurement is to increase income generation to support the NDA in delivering it's mission.
It is anticipated that the agreement may be based upon a 2 year initial term with 2 twelve month optional extensions.
It is anticipated that the total contract value will be circa £240,000 and £500,000 for the initial term, with a potential income value between £480,000 and £800,000 across a potential total 4-year term, subject to Supplier performance. Please note, we appreciate that income will change based upon market conditions and fluctuations, therefore these are indicative estimates.
- How the procedure runs: This tender will utilise the Competitive Flexible Procedure under Procurement Act 2023
CPV: Electricity · Electricity distribution and related services · Electricity supplies · Electricity, heating, solar and nuclear energy · Energy and related services · Energy meters · Energy-efficiency consultancy services · Energy-management services · Feasibility study, advisory service, analysis · Hardware integration consultancy services · Installation services of electricity control equipment · Operation of a power plant · +3 more
The lotProcurement structure
single lot · value publishedWhat it takes to wini
How this buyer will score bids.
The evaluation criteria and weights exactly as published on the notice, grouped by family (price, quality, social value and so on).
Evaluation split and conditions of participation as published; the tender pack may add morei
How this buyer will score bids.
The evaluation criteria and weights exactly as published on the notice, grouped by family (price, quality, social value and so on).
Published sub-criteria (10)
- T1 - Trading Methodology: 10%
- T2 - Ensuring Additional return on Investment: 15%
- T3 - Performance & Contract Management: 10%
- T4 - System & Dispatch Integration Solution: 10%
- T5 - Implementation & Mobilisation: 5%
- SV01 - Wellbeing & Inclusion: 10%
- C1 - Set up costs: 5%
- C2 - Core Service Fee: 20%
- C3 - Additional Income Fees: 10%
- C4 - Capacity Market Fee: 5%
Published award criteria (10)
- T1 - Trading Methodology: Please detail you proposed trading methodology for the Maentwrog Hydro Power Plant in compliance with Document 2 - Optimisation Specification. Your answer should include the following areas: • Details of a draft Trading Risk Management Strategy which details how you will trade the asset in line with parameters defined within Document 2 - Optimisation Specification. • Forecasting & profiling, technical & fundamental analysis • Appropriate Resource Allocation • Alignment with NDA’s defined risk appetite • Breadth of market access • Alignment with operational parameters detailed within Document 2 - Optimisation Specification • Learning from experience (LFE)
- T2 - Ensuring Additional return on Investment: Describe the processes and procedures you have in place to support your strategy delivery, which ensure the return of additional income over and above N2EX. Your answer should cover the following areas: • Flexibility to respond to market movements • Diversification of markets • Revenue stacking opportunities and processes in place to utilise and benefit from the opportunities available to this asset • Market intelligence and data, including how you plan to utilise information and knowledge available to ensure the best possible income generation for the asset. • Ensuring site level knowledge is captured and continually considered in strategy execution • Continuous review of appropriate market access and availability • Any additional opportunities not evident within this tender which may demonstrate additional benefit
- T3 - Performance & Contract Management: Please explain how you will ensure your organisation successfully performs under this contract. Within your response, please detail the contract management processes and resources you will deploy to ensure successful delivery. Your answer should include the following areas: Identification of contract management team, including a dedicated account manager and support services. A robust and appropriate approach to stakeholder management. Facilitation of access to market expert Review meetings attendance from appropriate representatives The production, distribution and review of Key Performance Indicators, Management Information & Learning from Experience. Presentation of additional opportunities. Identification and management of risk collaboratively Dispute resolution, escalation processes & procedures Tracking of forecasted additional return on investment, performance and maximum opportunity available Cascading of market knowledge and regulation updates and through newsletters and training available on a free of charge basis. To support NDA colleagues with internal and external stakeholder engagement activities and publications.
- T4 - System & Dispatch Integration Solution: Please provide an explanation of your proposed integration design solution detailing the infrastructure, connectivity, security protocols, testing and required maintenance. Additionally, please attached a single line diagram which details the current site configuration in addition to the proposed infrastructure and/or connectivity based upon your proposal and the information shared within Document 2 – Service Specification. Your response should address the below requirements. • Define what technology will be utilised for your proposed Solution for remote dispatch • Detail how it will integrate with current system. • How the solution with ensure and detail the method for two-way communication, i.e. notices to and from site. • How you will ensure the installation/ integration is compliant with all appropriate regulations, i.e. wiring appropriate to the asset. • Detail the methods of systems protection specifically for the integration and the methodologies applied for the wider organisation, with confirmation that they meet the requirements detail within ‘Document 3 - System Interfaces and Integration Requirements’.
- T5 - Implementation & Mobilisation: Please provide a mobilisation project plan and narrative detailing how you will implement and mobilise this agreement should you be successful. The plan should detail all activities to be completed between contract signature and contract go live (estimated to be a 3-month period). Your response should address the below requirements. • The production of a mobilisation project plan detailing who, what, when, why and how approach and highlights key sign off stages for the plan pre and post go live. • Progress against plan review mechanisms and appropriate timeliness of reviews. • A dedicated implementation lead allocated by the Supplier at contract signature stage. • Timely resource allocation and team onboarding processes for trading, contract management, and all relevant support functions. • Inclusion of all relevant vetting and/or onboarding processes. • Systems integration deployment, including any associated installation at all locations, including remote activity. • All associated metering and notifications required to support contract go live, e.g. MVRAN transition, notice to incumbent. • Creating and set up of all appropriate billing and invoicing processes • Creating and set up of all appropriate Management Information and KPI reporting processes. • Identification of what NDA resource and how much time will be required and when. • Identification of what subcontractor resource and how much time will be required and when. • Inclusion of any relevant vetting and/or onboarding procedures. • All relevant security and access requirements will be met. • All appropriate training provisions delivery to time. • The plan and narrative are supported by appropriate resource, data, calculations and other relevant evidence, including flow charts, organisational structures etc. to demonstrate appropriateness.
- SV01 - Wellbeing & Inclusion: Social Value - Supporting Wellbeing and Inclusion including Mental Health of Employees Supporting Wellbeing and Inclusion including Mental Health of Employees Proposals should demonstrate the action that will be taken throughout this specific contract to support the health and wellbeing, including physical and mental health in the contract workforce. Proposals should also demonstrate how they will influence staff, suppliers, customers and communities through the delivery of the contract to support health and wellbeing including physical and mental health. Proposals should also demonstrate how they will embed Wellbeing and Inclusion into their organisation, and also Improve Health and Wellbeing within the team specifically working on this requirement. Please demonstrate the following: • What will your organisation do specifically for this requirement? • How will you do this? • How will this be monitored and measured against on a quarterly basis?
- C1 - Set up costs: This fee is the cost to implement and mobilise the agreement and should include all costs associated with solution and system design and integration. It will not be possible to request additional payment following the submission of the tender.
- C2 - Core Service Fee: This fee covers the provision of the services as detailed within the specification up to the N2EX price for the settlement period.
- C3 - Additional Income Fees: This fee is for income above the N2EX price for the settlement period. This is in addition to the core service fee and is an incentive for performing over and above the N2EX price. This additional fee is only applied to income amounts above the N2EX value on a total £ (pounds) basis for each trade identified as being over and above equivalent N2EX prices for that trade period.
- C4 - Capacity Market Fee: Fixed Annual Cost for administration and management of the Capacity market requirements under this agreement
- Price carries 40 of 100 points: a 10% discount moves about 4 points. The method statement decides this lot, not the discount.
Price arithmetic assumes straight proportional scoring; the tender pack may use another formula.
Procedure terms & legal framework
From the official record- Procedure method
- Competitive flexible procedure
- Legal basis
- UKPGA · 2023/54 Procurement Act 2023
- Procurement category
- Services
- Notice status
- Awarded
- Procurement threshold
- Above threshold (FTS publication)
- Regulatory regime
- Standard
- Commercial structure
- Stand-alone contract (no framework)
- Competition type
- Competitive procedure
- GPA / WTO covered
- Unspecified in notice
- Recurring procurement
- Unspecified in notice
- First published
- 24 Jul 2025, 09:55 BST
- Last source update
- 31 Jul 2026, 10:56 BST
- Award evaluation window
- Submission end – 25 May 2026
- Authority reference
C32127- FTS notice number
2026/S 000-002854- Latest notice
- Contract details notice (UK7)
- Classification (CPV)
- Delivery area
- Official registry OCID
ocds-h6vhtk-056518Find a Tender
- How it runs
This tender will utilise the Competitive Flexible Procedure under Procurement Act 2023
How it was run
Official notice- Submission deadline
- 17 Feb 2026, 12:00 GMT
- Clarification deadline
- 17 Feb 2026, 12:00 GMT
- Submission channel
- Official e-sourcing portal
- Electronic submission
- Allowed
- Accepted languages
- en
All communication and tender submissions should be submitted via the Atamis Supplier Portal
Timeline
24 Jul 2025 → 31 Jul 2026 · 11 dates- Planning notice published24 Jul 2025, 09:55 BST
- Market engagement15 Aug 2025, 23:59 BST
As part of the engagement process, NDA will seek feedback relating to the scope of services, commercial model and anticipated key terms and conditions of contract for the purpose of market feedback. Sharing of information and feedback will be facilitated via the Atamis procurement portal, however NDA reserve the right to change the format of communication with parties who register interest to Teleconference where relevant and appropriate to expedite the process. Interested parties should register their interest to this UK02: Preliminary Market Engagement Notice via the OneNda Atamis portal. This can be found at the following address: one-nda.force.com/s/Welcome ↗ Initial registration of your company is achieved by using the above website link and then clicking on "Register Here". It is envisaged that the information will be made available to interested parties on 28th July 2025 along with a questionnaire to capture feedback which should be submitted to the NDA via Atamis by 12 noon on 14th August 2025, however these dates be subject to change.
- Next notice expected380 days ago6 Oct 2025, 23:59 BST
- Tender notice published281 days ago13 Jan 2026, 16:51 GMT
- Clarification questions by247 days ago17 Feb 2026, 12:00 GMT
- Submission deadline247 days ago17 Feb 2026, 12:00 GMT
- Contract starts150 days ago25 May 2026, 00:00 BST
- Award decision expected by149 days ago25 May 2026, 23:59 BST
- Assessment summaries sent93 days ago21 Jul 2026, 00:00 BST
- Standstill ends83 days ago30 Jul 2026, 23:59 BST
- Latest notice published83 days ago31 Jul 2026, 10:56 BST
Notice history
13 events · 7 releases on Find a Tender · since 24 Jul 2025- Preliminary market engagement notice published24 Jul 2025, 09:55 BSTUK2
- Preliminary market engagement notice published24 Jul 2025, 13:47 BSTUK2
- Preliminary market engagement notice published30 Jul 2025, 08:36 BSTUK2
- Preliminary market engagement notice published30 Jul 2025, 09:33 BSTUK2
- Tender notice published13 Jan 2026, 16:51 GMTUK4
- Published value updated to £1,092,00013 Jan 2026, 16:51 GMTwas £1,100,000
- Status changed to active13 Jan 2026, 16:51 GMT
- Procurement method changed13 Jan 2026, 16:51 GMT
- Deadline published: 17 Feb 2026, 12:00 GMT13 Jan 2026, 16:51 GMT
- Contract award notice published21 Jul 2026, 13:17 BSTUK6
- Status changed to complete21 Jul 2026, 13:17 BST
- Contract details notice published31 Jul 2026, 10:56 BSTUK7
- Contract signature expected17 Aug 2026, 23:59 BSTscheduled
Published amendments (3)
The 'Description' section has been updated to form paragraphs to make the scope more readable.
Update Procurement Reference number.
Formatting paragraphs in the Description field
Routine re-releases (7)
- 2025-07: 4 releases · 24 Jul 2025, 30 Jul 2025
Commercial outcome & contract awards
Published awards, contracts and bid statistics, not a forecast| Awarded to | Value | Date | Status |
|---|---|---|---|
| GRIDBEYOND LIMITEDSMEVCSEMaentwrog Hydro Power Station Optimisation5 Oct 2026 – 4 Oct 2028 · up to 4 Oct 2030Extensions: 12+ 12 months · Options: 12+ 12 month permitted extensions upon approval of the Authority | £1,092,000same award published again · counted once | 21 Jul 2026standstill to 30 Jul 2026 | Standstill |
| GRIDBEYOND LIMITEDSMEVCSE | £1,092,000 † | — | Awarded |
Contracts
Maentwrog Hydro Power Station Optimisation · GRIDBEYOND LIMITEDSMEVCSE
- Signed
- 31 Jul 2026
- Value
- £1,092,000
- Period
- 5 Oct 2026 – 4 Oct 2028 · up to 4 Oct 2030 with extensions
- Status
- active
- Extensions
- 12+12 Options on approval from the Authority
- Options
- 12+12 Options on approval from the Authority
5 agreed KPIs: Trading Performance · Lake Level Management · Management Information …
- Trading Performance, Performance versus N2EX Day-Ahead Auction Price
- Lake Level Management, Maintenance of lake level between upper and lower thresholds, avoiding, where possible, overspilling of the reservoir or exposure of the lake bed.
- Management Information, The actual receipt of the management information required by the Generator’s contract manager by [tobe agreed] day of each Month.
- Social Value, The actual performance, with supporting evidence of delivery of the individual elements of the social value delivery plan
- Annual Review Meeting, Annual review to be completed within 1 Month of the contract anniversary and on an annual basis.The revise must include●Annual Performance Summary Review●Presentation & review of additional income generating opportunities or markets which mayor could become available to NDA to increase return on investment for the NDA. (This information must be captured and an owner assigned to each initiative. If the initiative is not appropriate, it must be marked as closed,documenting the reason why.)●Proposed/ potential opportunities or changes to trading strategy for consideration.
Bid statistics published by the authority
| Bids | SME | VCSE | Valid bid range |
|---|---|---|---|
| 1final-stage tenders | 1 | 0 | — |
Contracting authority & participating public bodies
Bidders & participating suppliers
1 commercial party on the notice- Gridbeyond LtdAwarded supplier
Official documents & specifications (7)
Official links; attachments are not copiedNotices published for this procedure
- Contract details notice Contract details notice on Find a Tender
- Contract award notice Contract award notice on Find a Tender
- Tender notice Tender notice on Find a Tender
- Preliminary market engagement notice Preliminary market engagement notice on Find a Tender
- Preliminary market engagement notice Preliminary market engagement notice on Find a Tender
- Preliminary market engagement notice Preliminary market engagement notice on Find a Tender
- Preliminary market engagement notice Preliminary market engagement notice on Find a Tender