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PROCUREMENT OPPORTUNITY

STEP Construction Partner (CP)

United Kingdom Fusion Energy · award, contract

Tender information last checkedLast checked 2 Oct 2026, 18:32.

Opportunity overview

UKIFS (now UKFE) has conducted this Procurement for a Construction Partner, who, together with a Fusion Partner (determined to be United Kingdom Atomic Energy Authority (UKAEA)), will bring together and develop extensive industrial capabilities to design and build a UK prototype fusion energy plant capable of delivering net-energy to the grid, and build a world-leading fusion delivery industry. The Procurement was originally divided into two lots: • Lot 1: Engineering Partner (EP) • Lot 2: Construction Partner (CP) However, Lot 1 – EP has since been cancelled. Lot 2 – CP is now the only Lot included in this Procurement exercise. The contract term for Lot 2 will expire 31 March 2029, followed by three (3) optional extension periods of four (4), six (6) and seven (7) years. UKFE will have the right to exercise an extension option at six (6) months’ notice. The maximum contract duration will be twenty (20) years with an estimated value of £10,000,000,000 across this period.

Awarded to

Amounts belong to published awards or contracts. Where several suppliers share one value, it is labelled as shared and is not a supplier-specific allocation.

ILIOS

Match pending…
Contract value
£10bn
Awarded
Not supplied
Contract signed
1 Apr 2026
Award ID
036554-2026-1-1
Status
active
Identifier
1157281
Location
Salford, UK, M50 3XP, United Kingdom

Classification

  • CPV45220000 — Engineering works and construction works
  • CPV45200000 — Works for complete or part construction and civil engineering work
  • CPV45213250 — Construction work for industrial buildings
  • CPV45214610 — Laboratory building construction work
  • CPV45222000 — Construction work for engineering works except bridges, tunnels, shafts and subways
  • CPV45223000 — Structures construction work
  • CPV45251000 — Construction works for power plants and heating plants
  • CPV45251100 — Construction work for power plant
  • CPV45251110 — Nuclear-power station construction work
  • CPV45251111 — Construction work for nuclear reactors
  • CPV45254200 — Construction work for manufacturing plant
  • CPV71500000 — Construction-related services
  • CPV71520000 — Construction supervision services
  • CPV71521000 — Construction-site supervision services
  • CPV71530000 — Construction consultancy services
  • CPV71540000 — Construction management services
  • CPV71541000 — Construction project management services
  • CPV79418000 — Procurement consultancy services

Lots

  • Construction PartnerValue not stated

Published notice details

Additional information from the published procurement release. Fields appear only when supplied by the source; check the original notice and tender documents before acting.

Scope, procedure and submissions

Id
T-SP050-22
Status
complete
Main Procurement Category
works
Procurement Method
selective
Procurement Method Details
Competitive dialogue
Review Details
In accordance with the Public Contracts Regulations (PCR) 2015, the authority will observe a minimum ten (10) calendar day standstill period at the point that information regarding the award of the contract is communicated to tenderers. If an appeal regarding the award of a contract has not been successfully resolved by the authority, the Public Contracts Regulations (PCR) 2015 provide for aggrieved parties who have been harmed or are at risk of harm by a breach of the Regulations to take action in the High Court (England, Wales and Northern Ireland).

Legal basis

Id
32014L0024
Scheme
CELEX

Classification

Scheme
CPV
Id
45220000
Description
Engineering works and construction works

Covered By

GPA

Lots and requirements

Entry 1
Id
2
Title
Construction Partner
Description
The Construction Partner’s (CP) primary responsibility will be to collaboratively provide the capability to drive the integrated design of the overall layout, buildings, infrastructure, onsite and offsite facilities of the STEP Prototype Plant (SPP) to fulfil the support, enclosure and environmental requirements of the operational plant. The CP will then purchase, fabricate, deliver and install all elements of the designed facilities utilising existing and new supply chains, directly sourced or contracted resources. The CP’s responsibilities will include (but not be limited to) managing the overall health, safety, environment and security systems applicable to all parties engaged at the site. Additional information: Lot 1 for the Engineering Partner (EP) was cancelled and will not be awarded. Only Lot 2 for the Construction Partner (CP) forms part of this notice.
Has Options
No
Status
cancelled

Award criteria

Criteria

Criterion 1
Name
Corporate: Economic Value
Type
quality
Description
15%
Criterion 2
Name
Corporate: Social Value
Type
quality
Description
10%
Criterion 3
Name
Programme
Type
quality
Description
17%
Criterion 4
Name
Technical
Type
quality
Description
18%
Criterion 5
Name
Cultural: Behavioural and Collaborative Assessment
Type
quality
Description
15%
Criterion 6
Name
Contractual Compliance
Type
quality
Description
Pass / Fail
Criterion 7
Type
price
Description
25%

Items and delivery

Item 1
Id
2
Related Lot
2

Additional Classifications

Entry 1
Scheme
CPV
Id
45200000
Description
Works for complete or part construction and civil engineering work
Entry 2
Scheme
CPV
Id
45213250
Description
Construction work for industrial buildings
Entry 3
Scheme
CPV
Id
45214610
Description
Laboratory building construction work
Entry 4
Scheme
CPV
Id
45222000
Description
Construction work for engineering works except bridges, tunnels, shafts and subways
Entry 5
Scheme
CPV
Id
45223000
Description
Structures construction work
Entry 6
Scheme
CPV
Id
45251000
Description
Construction works for power plants and heating plants
Entry 7
Scheme
CPV
Id
45251100
Description
Construction work for power plant
Entry 8
Scheme
CPV
Id
45251110
Description
Nuclear-power station construction work
Entry 9
Scheme
CPV
Id
45251111
Description
Construction work for nuclear reactors
Entry 10
Scheme
CPV
Id
45254200
Description
Construction work for manufacturing plant
Entry 11
Scheme
CPV
Id
71500000
Description
Construction-related services
Entry 12
Scheme
CPV
Id
71520000
Description
Construction supervision services
Entry 13
Scheme
CPV
Id
71521000
Description
Construction-site supervision services
Entry 14
Scheme
CPV
Id
71530000
Description
Construction consultancy services
Entry 15
Scheme
CPV
Id
71540000
Description
Construction management services
Entry 16
Scheme
CPV
Id
71541000
Description
Construction project management services
Entry 17
Scheme
CPV
Id
79418000
Description
Procurement consultancy services

Delivery locations

Entry 1
Region
UK

Buyer, suppliers and contacts

Organisation 1
Name
United Kingdom Fusion Energy
Id
GB-FTS-180527

Identifier

Legal Name
United Kingdom Fusion Energy
Id
N/A

Address

Street Address
Culham Campus
Locality
Abingdon
Region
UK
Postal Code
OX14 3DB
Country Name
United Kingdom

Contact

Roles

buyer

Details

Classifications

Entry 1
Scheme
TED_CA_TYPE
Id
BODY_PUBLIC
Description
Body governed by public law
Entry 2
Scheme
COFOG
Id
01
Description
General public services
Organisation 2
Name
ILIOS
Id
GB-FTS-180528

Identifier

Legal Name
ILIOS
Id
1157281

Address

Street Address
2nd Floor, Optimum House, Clippers Quay
Locality
Salford
Region
UK
Postal Code
M50 3XP
Country Name
United Kingdom

Roles

supplier

Details

Scale
large
Organisation 3
Name
The High Court
Id
GB-FTS-2714

Identifier

Legal Name
The High Court

Address

Street Address
The Royal Courts of Justice
Locality
London
Country Name
United Kingdom

Roles

reviewBody
mediationBody
reviewContactPoint

Award information

Award 1
Id
036554-2026-1-1
Title
STEP Engineering Partner and Construction Partner
Status
active

Related lots

2

Suppliers

Supplier 1
Id
GB-FTS-180528
Name
ILIOS

Contracts and changes

Entry 1
Id
036554-2026-1-1
Award ID
036554-2026-1-1
Title
STEP Engineering Partner and Construction Partner
Status
active
Date Signed
2 Apr 2026, 00:00

Value

Amount
10,000,000,000
Currency
GBP

Recorded locations

  • Buyer location · Abingdon · UK · OX14 3DB · United Kingdom
  • Delivery location · UK

Notice and amendment history

1 published notice version reviewed by ProcuraAxis.

1 VERSION
  1. 036554-2026award, contract ·