---
title: "Climate Ambition Support Alliance Phase 3 (CASA3)"
ocid: "ocds-h6vhtk-06f0c3"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-06f0c3"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-06f0c3.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-06f0c3.json"
source: "Find A Tender Service"
current_stage: "Tender"
buyer: "Department for Energy Security & Net Zero"
published: "2026-09-02"
---

# Climate Ambition Support Alliance Phase 3 (CASA3)

Buyer: Department for Energy Security & Net Zero  
Current stage: Tender  
OCID: ocds-h6vhtk-06f0c3

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## Summary

The Department for Energy Security & Net Zero is procuring services for Climate Ambition Support Alliance Phase 3 (CASA3). This is an international climate and foreign economic-aid-related service programme, focused on strengthening the capacity and capability of climate-vulnerable developing countries. The work is intended to help these countries participate effectively in international climate negotiations and engage as progressive, inclusive and rules-based voices within the United Nations Framework Convention on Climate Change and associated multilateral forums. Delivery is across the United Kingdom and developing-country partner contexts, with the department acting as the public-sector buyer. The opportunity is therefore relevant to organisations working in international climate policy, climate finance, development assistance, negotiation support or related capacity-building services.

The procurement has reached tender: the department invited offers through an open procedure. It is a single lot for services, with an estimated value of £8,400,000 excluding VAT and £10,080,000 including VAT. Questions could be submitted until 16 September 2026 at 5:00pm. Offers were due by 6 October 2026 at 5:00pm and are submitted electronically through Jaggaer, in English. The contract is scheduled to run from 4 January 2027 to 5 January 2029, with an extension described as two years plus two years and a maximum end date of 4 January 2030. Evaluation is weighted 85% to technical quality and 15% to commercial price. The award decision was due by 5 November 2026.

This opportunity suits organisations able to design and deliver international climate and development programmes that build institutional capacity in climate-vulnerable developing countries. Relevant providers are likely to include consultancies, international development organisations, climate-policy specialists, research bodies and partnerships with experience supporting governments or other public institutions in international negotiations. The requirement’s focus on the UNFCCC and associated multilateral forums favours teams with credible knowledge of global climate governance, negotiation processes and the needs of developing-country partners. Suppliers should be able to provide technically strong, inclusive and practical support, and to work across international stakeholder groups. Because technical quality carries most of the evaluation weighting, organisations with a demonstrably strong delivery approach should be well placed to compete.

## Notice

CASA3 is a strategic International Climate Finance (ICF) programme that strengthens the capacity and capability of climate-vulnerable developing countries to participate effectively in international climate negotiations. The programme contributes directly to UK Government priorities by supporting ambitious, inclusive and rules-based international climate negotiations, enabling developing country partners to engage as progressive voices within the United Nations Framework Convention on Climate Change (UNFCCC) and associated multilateral forums.

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/083238-2026 |
| Notice type | UK4 - Tender Notice |
| Procurement type | Standard |
| Procurement category | Services |
| Procurement method | Open |
| Procurement method details | Open procedure |
| Tender suitability | Not specified |
| Awardee scale | Not specified |
| All stages | Tender |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 2 Sep 2026 |
| Submission deadline | 6 Oct 2026 |
| Future notice date | Not specified |
| Award date | Not specified |
| Contract period | 4 Jan 2027 - 5 Jan 2029 |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | £8,400,000 |
| Lots value | £8,400,000 |
| Awards value | Not specified |
| Contracts value | Not specified |

## Status

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

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | Department for Energy Security & Net Zero |
| Locality | LONDON |
| Postcode area | South West London |
| Postcode | SW1A 2HP |
| 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

- 75 - Administration, defence and social security services

### Codes

- 75211200 - Foreign economic-aid-related services

## Release History

- 2 Sep 2026 at 17:33 - Tender - UK4 - Tender Notice - https://www.find-tender.service.gov.uk/Notice/083238-2026

## Documents

- https://www.find-tender.service.gov.uk/Notice/083238-2026
  2nd September 2026 - Tender notice on Find a Tender

## Notice URLs

- https://www.jaggaer.com/
- 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-06f0c3. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-06f0c3.json.