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Maentwrog Hydro Power Station Optimisation Services

Nuclear Decommissioning Authority

This public procurement record has 7 releases in its history.

Award

31 Jul 2026 at 10:56

UK7 - Contract Details Notice
Award

21 Jul 2026 at 13:17

UK6 - Contract Award Notice
Tender

13 Jan 2026 at 16:51

UK4 - Tender Notice
PlanningUpdate

30 Jul 2025 at 09:33

UK2 - Preliminary Market Engagement Notice
PlanningUpdate

30 Jul 2025 at 08:36

UK2 - Preliminary Market Engagement Notice
PlanningUpdate

24 Jul 2025 at 13:47

UK2 - Preliminary Market Engagement Notice
Planning

24 Jul 2025 at 09:55

UK2 - Preliminary Market Engagement Notice
Summary of the contracting process

The Nuclear Decommissioning Authority (NDA) procured energy generation and trading optimisation services for Maentwrog Hydroelectric Power Station, a 28MW hydroelectric plant owned by the NDA and operated by Magnox Limited. The service covers trading available generation capacity in the wholesale electricity market, using market expertise, fundamental and technical analysis, water volumes, rainfall and operational measurements. It also includes energy management, power-plant operation support, market and income analysis, metering, electricity control equipment and systems integration. The purpose is to increase income generated by the asset and support the NDA’s nuclear decommissioning mission. Delivery relates to the Maentwrog site in the United Kingdom. This is a services procurement, with associated works covering installation and integration activity.

The procurement has been awarded following an open competitive flexible procedure under the Procurement Act 2023. One lot was awarded to Gridbeyond Ltd, an SME, on 21 July 2026; the contract was signed on 31 July 2026 and is active. The contract value is £1,092,000 excluding VAT (£1,310,400 including VAT). The initial contract period runs from 5 October 2026 to 4 October 2028, with two permitted 12-month extensions taking the maximum end date to 4 October 2030. Evaluation was based on quality and commercial criteria: trading methodology 10%, additional return on investment 15%, performance and contract management 10%, system and dispatch integration 10%, mobilisation 5%, wellbeing and inclusion 10%, set-up costs 5%, core service fee 20%, additional income fees 10%, and capacity market fee 5%.

This award indicates demand for suppliers able to optimise revenue from operational hydroelectric generation in wholesale electricity markets, rather than simply provide conventional energy consultancy. A credible competitor would need trading capability, broad market access, forecasting and profiling expertise, and the ability to combine technical and fundamental analysis with rainfall, water-volume and site-operational data. It would also need a risk management approach aligned with an asset owner’s risk appetite, plus processes for identifying additional markets, revenue stacking and income above the N2EX benchmark. Delivery requires remote dispatch and two-way systems integration, secure connectivity, metering and electricity-control expertise, testing, maintenance and regulatory compliance. Strong contract-management, mobilisation, stakeholder, KPI and management-information capability are also important, alongside measurable wellbeing and inclusion commitments.

How relevant is this notice?

Notice Information

Notice Title

Maentwrog Hydro Power Station Optimisation Services

Notice Description

NDA 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 PS240,000 and PS500,000 for the initial term, with a potential income value between PS480,000 and PS800,000 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.

Lot Information

Lot 1

Options: The contract term will be valid from contract commencement for an initial two (2) year period, following which there are with two (2) 12-month optional extensions, which may be invoked by agreement between the parties, a minimum of 9 months prior to the end date.

Renewal: 2 x12 month extensions

Planning Information

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: https://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.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-h6vhtk-056518
Publication Source
Find A Tender Service
Latest Notice
https://www.find-tender.service.gov.uk/Notice/072589-2026
Current Stage
Award
All Stages
Planning, Tender, Award

Procurement Classification

Notice Type
UK7 - Contract Details Notice
Procurement Type
Standard
Procurement Category
Services
Procurement Method
Open
Procurement Method Details
Competitive flexible procedure
Tender Suitability
SME
Awardee Scale
SME

Common Procurement Vocabulary (CPV)

CPV Divisions

09 - Petroleum products, fuel, electricity and other sources of energy

31 - Electrical machinery, apparatus, equipment and consumables; lighting

38 - Laboratory, optical and precision equipments (excl. glasses)

51 - Installation services (except software)

65 - Public utilities

71 - Architectural, construction, engineering and inspection services

72 - IT services: consulting, software development, Internet and support

79 - Business services: law, marketing, consulting, recruitment, printing and security

CPV Codes

09300000 - Electricity, heating, solar and nuclear energy

09310000 - Electricity

31682000 - Electricity supplies

38551000 - Energy meters

51112200 - Installation services of electricity control equipment

65300000 - Electricity distribution and related services

65400000 - Other sources of energy supplies and distribution

65410000 - Operation of a power plant

71241000 - Feasibility study, advisory service, analysis

71314000 - Energy and related services

71314200 - Energy-management services

71314300 - Energy-efficiency consultancy services

72227000 - Software integration consultancy services

72228000 - Hardware integration consultancy services

79930000 - Specialty design services

Notice Value(s)

Tender Value
£1,092,000 £1M-£10M
Lots Value
£1,092,000 £1M-£10M
Awards Value
£1,092,000 £1M-£10M
Contracts Value
£1,092,000 £1M-£10M

Notice Dates

Publication Date
31 Jul 20261 months ago
Submission Deadline
17 Feb 2026Expired
Future Notice Date
6 Oct 2025Expired
Award Date
21 Jul 20261 months ago
Contract Period
5 Oct 2026 - 4 Oct 2028 2-3 years
Recurrence
Not specified

Notice Status

Tender Status
Complete
Lots Status
Complete
Awards Status
Active, Pending
Contracts Status
Active

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
Nuclear Decommissioning Authority
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
CUMBRIA
Postcode
CA24 3HU
Postcode Area
Carlisle
Country
England
Major Region (ITL 1)
TLD North West (England)
Basic Region (ITL 2)
TLD1 Cumbria
Small Region (ITL 3)
TLD13 Cumberland
Delivery Location
Not specified
Local Authority
Cumberland
Electoral Ward
Egremont North and St Bees
Westminster Constituency
Whitehaven and Workington

Supplier Information

Number of Suppliers
1
Supplier Name

GRIDBEYOND LIMITED

Further Information

Notice Documents

Open Contracting Data Standard (OCDS)

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