Awarded contract

STEP Construction Partner (CP)

Details

Supplier(s)
ILIOS
Value
GBP 10,000,000,000
Topic
Works for complete or part construction and civil engineering work
Published
22 April 2026

Tender description

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. Lot 2: Construction Partner 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.

Timeline

  1. Completed: Award date2 April 2026
  2. Completed: Award published22 April 2026
    Current notice

About the buyer

UK Atomic Energy Authority is a public sector buyer in United Kingdom publishing tenders and awards on Stotles. Explore their procurement activity and find more opportunities like this one.

Relevant CPV codes

  • 45200000 · Works for complete or part construction and civil engineering work
  • 45213250 · Construction work for industrial buildings
  • 45214610 · Laboratory building construction work
  • 45220000 · Engineering works and construction works
  • 45222000 · Construction work for engineering works except bridges, tunnels, shafts and subways
  • 45223000 · Structures construction work
  • 45251000 · Construction works for power plants and heating plants
  • 45251100 · Construction work for power plant
  • 45251110 · Nuclear-power station construction work
  • 45251111 · Construction work for nuclear reactors
  • 45254200 · Construction work for manufacturing plant
  • 71500000 · Construction-related services
  • 71520000 · Construction supervision services
  • 71521000 · Construction-site supervision services
  • 71530000 · Construction consultancy services
  • 71540000 · Construction management services
  • 71541000 · Construction project management services
  • 79418000 · Procurement consultancy services

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Contracts Manager+44 •••• ••••••

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