UK Fusion Energy STEP tenders: scope, lots and timelines for project teams
Reviewed by Tom Sullivan
First reported on The Construction Index
30 Second Briefing
Tenders have opened for UK Fusion Energy’s £138m STEP Fusion programme, which aims to deliver the UK’s first energy-producing fusion reactor after decades of sub‑break‑even fusion experiments. The procurement is split into five lots, including a Breeder Blanket System (Lot 1), a Fuel Cycle System Partner to design and integrate fuelling and fuel cycle sub-systems (Lot 2), and a Test Operations Partner to run UK fusion test facilities (Lot 3). Additional lots cover plant-wide control systems and whole-plant systems engineering and integration, with bids due by 29 January and contract awards targeted for April.
Technical Brief
- £138m procurement is structured into five distinct technical and integration lots under UK Fusion Energy.
- Fuel Cycle System Partner in Lot 2 will ultimately lead integrated fuelling and fuel cycle subsystem delivery.
- Lot 3’s Test Operations Partner will operate UK Fusion Energy test facilities and coordinate all associated test campaigns.
- Lot 5 covers systems engineering and whole-plant integration to deliver a single coherent operational facility.
- UKFE intends to cap awards at three lots per supplier to avoid over‑concentration of delivery risk.
- Tender submissions close 29 January, with contract awards targeted for April to maintain programme momentum.
Our Take
Capping awards at three lots per partner will likely draw in a broader spread of UK and European contractors than a single EPC model, which is consistent with how other complex Infrastructure projects in our database de-risk first-of-a-kind technology builds.
UK Fusion Energy’s earlier move to become a Tier 1 member of the Manufacturing Technology Centre suggests these lots may lean heavily on advanced manufacturing and prototyping capability, so bidders with MTC links or demonstrable fusion-adjacent R&D may be at an advantage.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
