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Technical Consultancy Framework

NATIONAL ENERGY SYSTEM OPERATOR LIMITED

This public procurement record has 4 releases in its history.

Tender

30 Jul 2026 at 09:10

UK4 - Tender Notice
Planning

12 Dec 2025 at 13:21

UK2 - Preliminary Market Engagement Notice
PlanningUpdate

24 Sep 2025 at 11:15

UK1 - Pipeline Notice
Planning

23 May 2025 at 12:38

UK1 - Pipeline Notice
Summary of the contracting process

National Energy System Operator Limited is procuring a UK-wide technical consultancy services framework for work supporting the energy system. It covers five disciplines: engineering and technical analysis; modelling, simulation and analytics; strategic technical consultancy; technical assurance covering safety, quality and compliance; and market design, economics and regulation. Services may include asset assessment and lifecycle modelling, power and gas network analysis, forecasting, energy-transition and decarbonisation modelling, whole-system strategy, resilience planning, safety engineering, quality management, sustainability advice, market design, econometrics, auction design and cost-benefit analysis. Lot 2 excludes data models, software and software-service packages, while end-to-end strategy-to-implementation solutions are procured elsewhere. Delivery is across the United Kingdom.

The procurement has reached tender: the buyer invited offers through a selective, competitive flexible procedure with two stages, a PSQ followed by an invitation to tender and contract award. Expressions of interest were due by 26 August 2026 at 23:59 BST. Tenders are submitted electronically through Ivalua, and the award decision was scheduled for 11 December 2026. The framework is expected to run from 4 January 2027 to 3 January 2031, with extension provisions potentially taking it to 3 January 2035. Its estimated value is £60.5 million excluding VAT (£72.6 million including VAT); each of the five lots is valued at £12.1 million excluding VAT (£14.52 million including VAT). The framework uses competitive and direct allocation, with commercial, technical and social-value criteria weighted 30%, 60% and 10%.

This opportunity suits technical consultancies, engineering firms, energy specialists, modelling and analytics providers, economists, regulatory advisers, assurance professionals and organisations working across safety, quality, risk, sustainability or resilience. Small and medium-sized enterprises are expressly considered suitable. Suppliers should be able to provide specialist advice relevant to the energy sector and demonstrate capability in one or more of the five disciplines, including the lot-specific technical work described. The PSQ includes mandatory NESO-specific questions assessed on a pass/fail basis, followed by technical scoring for shortlisted suppliers. Requests to participate require agreement to NESO-specific non-disclosure and non-collusion agreements. Framework rate cards, rebates and discounts will support later call-offs, and social value forms part of evaluation.

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Notice Information

Notice Title

Technical Consultancy Framework

Notice Description

Technical Consultancy Framework shall be a multi-lot framework. Works shall be awarded in line Framework Call-Off Procedure. The framework shall consist of 5 lots covering numerous disciplines: - Engineering & Technical Analysis, - Modelling, Simulation & Analytics, - Strategic Technical Consultancy, - Technical Assurance, Safety & Quality, - Market Modelling Design & Economics. Once established works under the framework shall be awarded via a combination of competitive allocation and direct allocation.

Lot Information

Engineering & Technical Analysis

Provision advice and consulting services across various energy types in relation to engineering and technical analysis advice relevant to NESO specific requirements. Types of services required in this lot includes but is not limited to: * Asset assessment, Asset lifecycle modelling, CAPEX optimisation / investment planning & Criticality frameworks and maintenance strategy * Root-cause analysis * Risk analysis * Unit cost analysis and data * Engineering technical support & Network resilience * Problem resolution * Power system engineering analysis * Gas network hydraulic analysis * Energy Transition (Multi Energy & Net Zero)

Renewal: 1 + 1 + 1 + 1 extension provision

Modelling, Simulation & Analytics

Provision advice and consulting services in relation to the strategy formation of Modelling, Simulation & Analytics including, discovery, envisage and design stages of advice relevant to NESO specific requirements. Consultancy and advice in this area may include, but not limited to, consultancy relating to the following topics: * Power system modelling * Scenario analysis * Network & demand forecasting & planning support * Digital simulations * Nodal Plexos (or equivalent) modelling * Integrated energy system planning * Flexibility & Future System Modelling * Climate and Resilience analysis and modelling * Energy transition analysis and modelling * Decarbonisation modelling Please note; Lot 2 does not include the procurement of data models or the provision of software and services packages. Projects which require end to end solutions from strategy, discovery design & implementation will be procured via alternative routes to market.

Renewal: 1 + 1 + 1 + 1 extension provision

Strategic Technical Consultancy

Provision advice and consulting services in relation to Strategic Technical Consultancy advice relevant to NESO specific requirements. Types of services required in this lot includes but is not limited to: * Whole-system strategy * Market analysis * Technical advisory * Infrastructure and Operational optimisation * Net Zero & Energy Transition Strategy * Resilience strategy (National energy resilience planning & Security of supply strategy)

Renewal: 1 + 1 + 1 + 1 extension provision

Technical Assurance - Safety, Quality & Compliance

Provision advice and consulting services in relation to Environmental, Safety & Compliance advice relevant to NESO specific requirements. Types of services required in this lot includes but is not limited to: * Safety engineering * Quality management * Risk assessments and risk assessment methodologies * Technical policy review & drafting * Stakeholder & Policy Interface and alignment * Advisory Climate & Sustainability * Socio-economic Impact & Consumers analysis

Renewal: 1 + 1 + 1 + 1 extension provision

Market Design & Economics & Regulation

Provision advice and consulting services in relation to Market Design & Economics & Regulation advice relevant to NESO specific requirements. Types of services required in this lot includes but is not limited to: * Investment Mechanisms * Market design including wholesale Balancing and ancillary markets * Economics regulatory design * Cost of Capital Analysis * Microeconomics & Econometrics * Auction design * Cost-benefit analysis * Reliability mechanisms

Renewal: 1 + 1 + 1 + 1 extension provision

Planning Information

Objectives of the Engagement 1. Capture the expression of interest from technical consultancy providers who may wish to participate in the upcoming procurement 2. Obtain structured feedback on key aspects of the proposed procurement, including: .Scope and lotting strategy .Delivery models and ways of working .Commercial models and procurement approach Submitting your response would enable us to capture your expression of interest and help ensure the resulting framework is commercial viable, accessible and fit for purpose. Response Instructions All responses (including expression of interest) must be submitted via MS form link https://forms.office.com/e/6SMsr6CgPh by 8th January 2026, 12:00PM (BST). Completion of this form: . Registers your expression of interest . Provides an opportunity to offer feedback Engagement Method All supplier are requested to respond exclusively through the MS form. For any queries or clarifications, please reach out to NESO Procurement team via box.NESOIndirectsProcurement@neso.energy. Please note that we will not be providing any additional information on individual basis to ensure fairness and transparency. Disclaimer This is not a call for competition. Participation does not affect future tendering opportunities.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-h6vhtk-052235
Publication Source
Find A Tender Service
Latest Notice
https://www.find-tender.service.gov.uk/Notice/071979-2026
Current Stage
Tender
All Stages
Planning, Tender

Procurement Classification

Notice Type
UK4 - Tender Notice
Procurement Type
Framework
Procurement Category
Services
Procurement Method
Selective
Procurement Method Details
Competitive flexible procedure
Tender Suitability
SME
Awardee Scale
Not specified

Common Procurement Vocabulary (CPV)

CPV Divisions

71 - Architectural, construction, engineering and inspection services

CPV Codes

71621000 - Technical analysis or consultancy services

Notice Value(s)

Tender Value
£60,500,000 £10M-£100M
Lots Value
£60,500,000 £10M-£100M
Awards Value
Not specified
Contracts Value
Not specified

Notice Dates

Publication Date
30 Jul 20261 months ago
Submission Deadline
Not specified
Future Notice Date
1 Nov 2025Expired
Award Date
Not specified
Contract Period
4 Jan 2027 - 3 Jan 2031 4-5 years
Recurrence
Not specified

Notice Status

Tender Status
Active
Lots Status
Active
Awards Status
Not Specified
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
NATIONAL ENERGY SYSTEM OPERATOR LIMITED
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
WOKINGHAM
Postcode
RG41 5BN
Postcode Area
Reading
Country
England
Major Region (ITL 1)
TLJ South East (England)
Basic Region (ITL 2)
TLJ1 Berkshire, Buckinghamshire and Oxfordshire
Small Region (ITL 3)
TLJ16 Berkshire West
Delivery Location
Not specified
Local Authority
Wokingham
Electoral Ward
Winnersh
Westminster Constituency
Wokingham

Further Information

Notice Documents

Open Contracting Data Standard (OCDS)

View full OCDS Record for this contracting process

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The Open Contracting Data Standard (OCDS) is a framework designed to increase transparency and access to public procurement data in the public sector. It is widely used by governments and organisations worldwide to report on procurement processes and contracts.

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