---
title: "Software for Cable Thermal Ratings, Tunnel Thermal Modelling and Specialist Calculation capabilities (RoCiT, DRY, THORIN, RAUROS)"
ocid: "ocds-h6vhtk-06c684"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-06c684"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-06c684.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-06c684.json"
source: "Find A Tender Service"
current_stage: "Planning"
buyer: "NATIONAL GRID UK LIMITED"
published: "2026-07-08"
---

# Software for Cable Thermal Ratings, Tunnel Thermal Modelling and Specialist Calculation capabilities (RoCiT, DRY, THORIN, RAUROS)

Buyer: NATIONAL GRID UK LIMITED  
Current stage: Planning  
OCID: ocds-h6vhtk-06c684

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## Summary

National Grid UK Limited is currently in the planning stage of a procurement process titled "Software for Cable Thermal Ratings, Tunnel Thermal Modelling and Specialist Calculation capabilities (RoCiT, DRY, THORIN, RAUROS)." This procurement, initiated on 8th July 2026, seeks to engage with the market through a Request for Information (RFI) to understand the capabilities and solutions available for developing a comprehensive cable thermal rating and specialist calculation platform. The project falls under the goods category specifically within the software package and information systems industry (CPV code: 48000000), and is situated in the United Kingdom. Interested parties are requested to provide their responses by 23:00 UK time on 24th July 2026. This initiative is aimed at preparing National Grid Electricity Transmission (NGET) for subsequent procurement processes by identifying the right solutions suitable for critical national infrastructure environments.

This tender presents business growth opportunities for companies specialising in software development, particularly those with expertise in thermal modelling, engineering calculations, and system integrations within utility sectors. Firms that can offer comprehensive, modular, and scalable software solutions will find this RFI process particularly beneficial. Companies with a strong track record in cable thermal modelling, product maturity, and commercial innovation within critical infrastructure settings will be well-positioned. Additionally, providers with the ability to deliver auditable, transparent, and reproducible engineering-grade calculations aligned with evolving regulatory requirements are likely to contribute significantly to NGET’s future strategy and operations.

## Notice

The purpose of this Request for Information (RFI) is to obtain structured input from the market regarding the functional, technical, commercial, and non-functional capabilities required to support a future cable thermal rating and specialist calculation platform for National Grid Electricity Transmission (NGET). NGET is seeking to understand the availability, maturity, and suitability of solutions that can support the replacement, enhancement, or evolution of existing in-house engineering capabilities, including: * RoCiT - tunnel cable thermal modelling * DRY - direct burial dry-out and effective backfill diameter calculation * THORIN - effective backfill modelling for solid-filled troughs and non-standard geometries * RAUROS - thermal modelling of water-cooled cable systems In addition, NGET is interested in understanding broader rating enhancement capabilities and specialist calculation tools that improve modelling accuracy in complex installation environments. Through this RFI, NGET aims to gather insight into: * Supplier capability, domain expertise, and relevant experience in cable thermal modelling * Product maturity, technical readiness, and proven use in comparable utility environments * Commercial models, including licensing approaches, modular pricing (including specialist calculators), total cost of ownership, and flexibility to scale * Architectural approaches, integration patterns, and deployment models appropriate for a Critical National Infrastructure (CNI) environment * Security, scalability, and compliance considerations * Implementation methodologies, delivery approaches, and associated risks * Availability of integrated or modular solutions, including core rating engines and supporting calculators This RFI will inform NGET's future sourcing strategy and solution design, including the potential adoption of product- based, configurable, bespoke, or hybrid approaches, as well as appropriate commercial and contracting structures. The objective is to identify solutions that can deliver engineering-grade, transparent, auditable, and reproducible calculations, while supporting long-term maintainability, extensibility, and alignment with evolving operational, regulatory, and commercial requirements.

### Planning Information

Contact details: box.software-procurement@nationalgrid.com if you would like to receive the RFI document. 
Please send in your written response by 23:00 (UK time) on 24 July 2026 to box.software-procurement@nationalgrid.com
You may include diagrams and drawings along with your written content.

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/064265-2026 |
| Notice type | UK2 - Preliminary Market Engagement Notice |
| Procurement type | Standard |
| Procurement category | Goods |
| Procurement method | Not Specified |
| Procurement method details | Not specified |
| Tender suitability | Not specified |
| Awardee scale | Not specified |
| All stages | Planning |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 8 Jul 2026 |
| Submission deadline | Not specified |
| Future notice date | 3 Sep 2026 |
| Award date | Not specified |
| Contract period | 15 Jan 2027 - 14 Jan 2030 |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | Not specified |
| Lots value | Not specified |
| Awards value | Not specified |
| Contracts value | Not specified |

## Status

| Field | Value |
| --- | --- |
| Tender status | Planning |
| Lots status | Planning |
| Awards status | Not specified |
| Contracts status | Not specified |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | NATIONAL GRID UK LIMITED |
| Locality | LONDON |
| Post town | Central London |
| Postcode | WC2N 5EH |
| Country | England |
| ITL 1 | TLI London |
| ITL 2 | TLI3 Inner London - West |
| ITL 3 | TLI35 Westminster and City of London |
| Local authority | Westminster |
| Electoral ward | St James's |
| Westminster constituency | Cities of London and Westminster |
| Delivery location | Not specified |

## CPV Codes

### Divisions

- 48 - Software package and information systems

### Codes

- 48000000 - Software package and information systems

## Release History

- 8 Jul 2026 at 13:16 - Planning - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/064265-2026

## Documents

- https://www.find-tender.service.gov.uk/Notice/064265-2026
  8th July 2026 - Preliminary market engagement notice on Find a Tender

## Notice URLs

- https://www.legislation.gov.uk/ukpga/2023/54/contents

## 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-06c684. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-06c684.json.