Accepting bidstenderUnited Kingdom

Replacement of Large ISIS Power Supply System

Issued by UK Research & Innovation (UKRI) · via UK Find a Tender Service

Published: 10 Sept 2026
Closes: 23 Nov 2026, 14:00 UTC
Value: GBP 3,000,000
Reference: UKRI-6064
Location: United Kingdom
Sector: Energy & Power
Type: goods

At a glance

UK Research & Innovation (UKRI) in United Kingdom has published a tender in energy & power: “Replacement of Large ISIS Power Supply System”. Submissions close on 23 November 2026, 13 days from today. The stated value is GBP 3,000,000. Quote reference UKRI-6064 in any correspondence with the buyer. One document is attached to this notice. FreeTender has recorded 33 notices from this buyer since 2026, 19 of them currently open. There are 117 open energy & power notices in United Kingdom on FreeTender. Bids are submitted to the buyer through UK Find a Tender Service, not through FreeTender.

Key requirements

Taken from the notice by FreeTender. The tender document on the official portal is binding — check it, and any corrigendum, before you bid.

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Details

The ISIS Neutron and Muon Source Facility, part of UKRI’s Science and Technology Facilities Council, are looking to procure a replacement three-phase Alternating Current (AC) Magnet Power Supply System to make up the losses in a resonant magnet circuit. The requirement is for a modular 1200 kVA three-phase AC voltage source power supply that includes a control system capable of regulating the designated magnet load current to a given setpoint and to a high level of stability. It is important to emphasise that the magnet load current to be regulated is not the same as the AC power supply output current and the measurement signal for the load current will be provided by the facility in the form of a DCCT with a -10/+10 V signal representative of the load circuit current. The three-phase output shall have a variable voltage output from 0 V to 250 V line-neutral and an output voltage accuracy of ±50 mV. The system shall be fed from a nominal 400 Vrms AC, 3-phase 50 Hz sinusoidal supply, intrinsically safe by design, with high efficiency, high reliability, high maintainability and fully compliant and marked with relevant standards.

Context for bidders

We hold 33 notices from UK Research & Innovation (UKRI), going back to August 2026 — 19 of them still open. They buy mostly in Water & Environment, Construction & Infrastructure and Financial & Professional Services. There are 117 open Energy & Power tenders in United Kingdom. This one closes in 13 days.

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Documents

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Before you bid on this tender

A quick checklist to help you decide whether to bid and prepare a compliant submission for this energy & power opportunity. Always verify the details on the official source.

Confirm the exact closing date and time (and time zone) on the official portal — deadlines are strict and can be revised by a corrigendum.
Read the full notice and every attached document, including the scope, specifications and any bill of quantities or terms of reference.
Check the eligibility criteria — prior similar experience, annual turnover, certifications and registrations — and make sure you qualify before investing effort.
Prepare any earnest-money deposit (EMD) or bid security and the required formats early; missing or wrongly-formatted documents are a common cause of rejection.
Note how bids must be submitted (online or physical), in what format, and whether a digital signature or portal registration is required.
Watch for corrigenda and clarifications right up to the deadline — requirements and dates can change.

Common bidding mistakes to avoid →Writing a winning proposal