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AwardedUnited KingdomWorks£1Add to pipeline

STEP Construction Partner

Awarded to ILIOS

UK Atomic Energy Authority(buyer)

Published
Published 22 April 2026
Deadline
Closed 17 July 2024

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Overview

The UK Atomic Energy Authority (via UKFE) has awarded a construction partner contract to ILIOS valued at £10 billion for designing and building a UK prototype fusion energy plant capable of delivering net energy to the grid. The contract, which commenced in April 2026, runs until March 2029 with optional extension periods available, with a maximum duration of 20 years. This procurement originally included an engineering partner lot, which has since been cancelled, leaving only the construction partner scope.

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Key details

Country
United Kingdom
Status
Awarded
Category
Works
Estimated value
£1
Procedure
Competitive dialog
SME suitable
Yes
Published
22 April 2026
Deadline
Closed
Classification (CPV)
Works for complete or part construction and civil engineering workEngineering works and construction worksEngineering, auxiliary, average, loss, actuarial and salvage insurance servicesArchitectural, construction, engineering and inspection servicesArchitectural, engineering and planning servicesArchitectural, engineering and surveying servicesEngineering servicesConsultative engineering and construction services+17 more

Award outcome

Awarded value
£10,000,000,000
Award date
1 April 2026
Contract period
1 April 2026 → 31 March 2029
Contract length
3 years
Against estimate
999999999900% above
Winner
  • ILIOS

This contract ends on 31 March 2029.

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About the winner

ILIOS

No other contract from UK Atomic Energy Authority under this supplier name in Skim's records.

See every contract ILIOS holds and when each one ends

Market context

Typical award in Construction work

£160,228

Median of 19,437 awards in the last 24 months

This award is 62410.9× the median.

UK Atomic Energy Authority in the last 12 months

38

contracts awarded, worth £11,656,123,886 in total

See their procurement profile →

Recent awards in Construction work

The latest contracts other buyers awarded under the same classification.

Notice history

Every published notice in this contracting process, newest first.

  1. Contract Award Notice

    22 April 2026

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