In brief
- £9.5 million, 20-month contract for effluent discharge works at Hunterston B
- Ranks fourth among NRS awards since 2023 in GovMarket records
- Runs 19 October 2026 to 9 June 2028
Nuclear Restoration Services has awarded Costain a £9.5 million, 20-month contract for final design and marine installation of alternative active effluent discharge lines at the Hunterston B nuclear site, according to a notice published on 5 November.
The work covers the seaward-side effluent pipework and valves, including end-of-line isolation and backflow protection, culvert fixings, pipe fitting and valve replacement, pressure testing and a maintenance strategy at Hunterston B. The award was made via a mini-competition under NRS's Decommissioning and Asbestos Removal Framework Lot 1.
It ranks fourth among NRS contracts since 2023 in GovMarket records. Costain is among NRS's top suppliers by value, with three contracts worth £81.3 million.
Costain has 89 public sector contracts worth £2.54 billion in GovMarket records since 2016. Its largest other contract is an £840 million award from Transport for London in 2026.
The contract runs from 19 October 2026. It ends on 9 June 2028.
Key facts
* 2026 so far
| Year | Value | Contracts |
|---|---|---|
| 2022 | £532k | 5 |
| 2023 | £2.8m | 24 |
| 2024 | £33.4m | 123 |
| 2025 | £129.2m | 91 |
| 2026 | £87.6m | 133 |
* 2026 so far
| Year | Value | Contracts |
|---|---|---|
| 2021 | £140.8m | 15 |
| 2022 | £107.3m | 13 |
| 2023 | £7.6m | 12 |
| 2024 | £379k | 6 |
| 2025 | £481.6m | 11 |
| 2026 | £974.8m | 12 |
Written from published notices and GovMarket contract records. Totals cover GovMarket records, which start at different dates for each source.
