--- title: "ESS Electrical , Remedial & Integration Works Project is Sweden" ocid: "ocds-h6vhtk-06aadb" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-06aadb" markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-06aadb.md" json_url: "https://d3tenders.com/contract/ocds-h6vhtk-06aadb.json" source: "Find A Tender Service" current_stage: "Award" buyer: "UK ATOMIC ENERGY AUTHORITY" published: "2026-06-01" --- # ESS Electrical , Remedial & Integration Works Project is Sweden Buyer: UK ATOMIC ENERGY AUTHORITY Current stage: Award OCID: ocds-h6vhtk-06aadb [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-h6vhtk-06aadb) [Download OCDS JSON](https://d3tenders.com/contract/ocds-h6vhtk-06aadb.json) ## Summary The procurement process, initiated by the UK Atomic Energy Authority, pertains to the "ESS Electrical, Remedial & Integration Works Project" at the ESS Active Cells Facility in Lund, Sweden. This project falls under the industry category of "other electrical installation work," with a focus on works. The procurement stage is at the award, with a contract signed on 1st June 2026. The awarded supplier is Optimum Electrical Engineering Ltd, and the procurement method was limited, negotiated without publication due to technical continuity requirements. This continuation of electrical installation and integration works, valued at £109,000, ensures minimal disruption and adheres to safety and technical standards crucial for the project's completion. This tender presents opportunities predominantly for businesses experienced in complex electrical installations, especially those able to provide continuity in ongoing projects. Companies like Optimum Electrical Engineering Ltd, with existing compliance in Sweden and understanding of site-specific technicalities, are well-suited to compete in such contracts. The procurement process carefully avoids the risks associated with replacing a supplier mid-project, hence benefiting businesses that can assure seamless integration without compromising on quality and safety standards. This is an attractive venture for large-scale firms capable of managing detailed electrical projects within a strategic partnership framework. ## Notice The requirement relates to the continuation of existing electrical, remedial, snagging, labelling, energisation/de-energisation support, commissioning support and integration works being undertaken by Optimum Electrical Engineering Ltd on the ESS Active Cells Facility project in Lund, Sweden. ### Lot Information Lot 1 The requirement relates to the continuation of existing electrical, remedial, snagging, labelling, energisation/de-energisation support, commissioning support and integration works being undertaken by Optimum Electrical Engineering Ltd on the ESS Active Cells Facility project in Lund, Sweden. Optimum has been delivering the electrical installation and associated support works on site since the original competitively tendered arrangement. The remaining requirement is not a discrete new package of work that can be separated and competed without significant technical, safety, quality and programme risk. It is a continuation of ongoing works across partially completed electrical installations, live snagging, system interfaces, Quality Assurance handover, commissioning support and subcontractor Site Acceptance Test readiness. Optimum currently manages the electrical installation programme at the ESS Active Cells Facility site and is responsible for the day-to-day electrical safety activities associated with the works. Optimum has established site processes, RAMS, QA documentation routes, ESS competency arrangements and electrical safety responsibilities that are already embedded into the project delivery model. Optimum's Lead Project Engineer has also held key electrical safety responsibilities on site, including AP(E)-type duties and authority to support switching arrangements agreed with ESS. Replacing Optimum would require these arrangements to be re-established, reassessed and accepted by ESS, which would introduce delay and additional safety assurance risk. A change in supplier at this stage would result in disproportionate technical difficulties and delivery risk. Any replacement supplier would need to mobilise, familiarise itself with the facility, review partially completed electrical works, understand historical design and installation decisions, engage with Optimum for technical and QA handover, establish RAMS and ESS competency approvals, and take responsibility for live electrical safety and commissioning interfaces. This would create duplicated effort, additional UKAEA management burden and a high risk of delay to the remaining installation, testing, commissioning and handover programme. There is also a regulatory constraint. UKAEA cannot directly undertake electrical installation works in Sweden because Swedish electrical installation companies must hold compliance officer status. UKAEA has previously been rejected by Sweden's National Electrical Safety Board for company registration and compliance officer status. ESS holds this status but has not agreed for UKAEA to work under ESS's compliance officer arrangements. Optimum holds the required Swedish compliance officer status and is therefore the current route through which UKAEA can continue electrical installation, energisation, de-energisation, commissioning support and associated electrical safety activities on site. The new contract will be supported by a defined Scope of Work, managed through the contract documentation, Primavera P6 programme, electrical package snagging list and UKAEA instruction. This will allow UKAEA to control, instruct, prioritise and monitor the remaining activities while retaining flexibility to respond to emerging snags, system readiness, external supplier delays and commissioning requirements. ### Procurement Information The requirement relates to the continuation of existing electrical, remedial, snagging, labelling, energisation/de-energisation support, commissioning support and integration works being undertaken by Optimum Electrical Engineering Ltd on the ESS Active Cells Facility project in Lund, Sweden. Optimum has been delivering the electrical installation and associated support works on site since the original competitively tendered arrangement. The remaining requirement is not a discrete new package of work that can be separated and competed without significant technical, safety, quality and programme risk. It is a continuation of ongoing works across partially completed electrical installations, live snagging, system interfaces, Quality Assurance handover, commissioning support and subcontractor Site Acceptance Test readiness. The remaining works are programme-critical and directly linked to system readiness, commissioning, subcontractor SATs and handover. Re-procuring or onboarding a new supplier would create an intolerable risk of delay, duplicated cost, loss of technical continuity, quality assurance issues and potential disruption to other subcontractors. It would also introduce serious reputational risk. ESS is a major European research infrastructure programme and delays to the UK-delivered Active Cells Facility could impact ESS operational readiness and the UK's reputation as a reliable delivery partner. The new contract will be supported by a defined Scope of Work, managed through the contract documentation, Primavera P6 programme, electrical package snagging list and UKAEA instruction. This will allow UKAEA to control, instruct, prioritise and monitor the remaining activities while retaining flexibility to respond to emerging snags, system readiness, external supplier delays and commissioning requirements. ## Key Details | Field | Value | | --- | --- | | Publication source | Find A Tender Service | | Latest notice | https://www.find-tender.service.gov.uk/Notice/051619-2026 | | Notice type | Award Notice | | Procurement type | Standard | | Procurement category | Works | | Procurement method | Limited | | Procurement method details | Negotiated without publication of a contract notice | | Tender suitability | Not specified | | Awardee scale | Large | | All stages | Award | ## Dates | Field | Value | | --- | --- | | Publication date | 1 Jun 2026 | | Submission deadline | Not specified | | Future notice date | Not specified | | Award date | 31 May 2026 | | Contract period | Not specified | | Recurrence | Not specified | ## Values | Field | Value | | --- | --- | | Tender value | Not specified | | Lots value | Not specified | | Awards value | Not specified | | Contracts value | £109,000 | ## Status | Field | Value | | --- | --- | | Tender status | Complete | | Lots status | Not specified | | Awards status | Active | | Contracts status | Active | ## Buyer | Field | Value | | --- | --- | | Main buyer | UK ATOMIC ENERGY AUTHORITY | | Locality | OXFORDSHIRE | | Post town | Oxford | | Postcode | OX14 3DB | | Country | England | | ITL 1 | TLJ South East (England) | | ITL 2 | TLJ1 Berkshire, Buckinghamshire and Oxfordshire | | ITL 3 | TLJ14 Oxfordshire CC | | Local authority | South Oxfordshire | | Electoral ward | Sandford & the Wittenhams | | Westminster constituency | Didcot and Wantage | | Delivery location | Not specified | ## Supplier | Field | Value | | --- | --- | | Number of suppliers | 1 | | Supplier names | OPTIMUM ELECTRICAL ENGINEERING | ## CPV Codes ### Divisions - 45 - Construction work ### Codes - 45317000 - Other electrical installation work ## Release History - 1 Jun 2026 at 22:23 - Award - Award Notice - https://www.find-tender.service.gov.uk/Notice/051619-2026 ## Notice URLs - https://www.gov.uk/government/organisations/uk-atomic-energy-authority ## Provenance This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-06aadb. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-06aadb.json.