Perseus: unlocking sustainable finance with assurable smart data

Perseus has the potential to unlock a £5–10bn opportunity in embedded sustainable finance. With incentives that can radically reduce reporting costs, Perseus accelerates capital into energy efficiency, lowers carbon intensity, and enables new financial innovation on resilience and adaptation. It is led by 70 commercial members, including 12 banks and lenders, and orchestrated by IB1.  […]

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Perseus has the potential to unlock a £5–10bn opportunity in embedded sustainable finance.

With incentives that can radically reduce reporting costs, Perseus accelerates capital into energy efficiency, lowers carbon intensity, and enables new financial innovation on resilience and adaptation. It is led by 70 commercial members, including 12 banks and lenders, and orchestrated by IB1. 

Join Perseus today

2025 report

Read about the progress of Perseus in 2025 and the plans for 2026.

“The Net Zero Council welcomes innovative programmes such as Perseus that help simplify and automate emissions reporting and unlock access to finance for SMEs” 

UK Net Zero Council gov.uk/government/groups/net-zero-council
“We are participating in the pilot to demonstrate use cases of Perseus in Green investment, using Perseus derived emissions data in our due diligence for green business loans. We think that Perseus is a feasible market solution to scale assurable SME carbon accounting and disclosures. It can help to reduce business burden and drive down costs for SMEs, while providing assurance of data sources for lenders, thereby supporting SMEs to access the finance they need to help deliver Net Zero.” 
Matthew Kelly, Sustainability Manager, Development Bank of Wales

Vision
Perseus will help unlock access to finance that reduces emissions faster by automating sustainability reporting for every SME business in the UK. Perseus will make it easy to share accurate, assurable data that sits behind emissions calculations to enable better analysis, action and impact.

The challenge

There are more than 5.5 million Small and Medium-sized Enterprises (SMEs) in the UK, accounting for around half of the country’s business greenhouse gas emissions. However, there is no common process to follow when reporting emissions, and many reports are based on inaccurate estimates. SMEs’ stakeholders like banks and corporate customers are therefore receiving low-quality data that is not comparable or actionable. Emissions reporting is currently a burdensome process for SMEs that prevents them from focusing on their core business.

The solution

Perseus enables automated emissions reporting for every SME in the UK, so that we can get to Net Zero faster. It creates the rules and processes that make automated reporting possible. These rules will enable products and services such as accounting platforms, emissions calculators, and reporting software to deliver higher-quality emissions data at scale. This will inform investment decisions, enable targeted decarbonisation interventions, reduce reporting burdens and unlock green finance. IB1 are convening a cross-sector coalition to collaboratively shape the future of emissions reporting, ensuring that a wide range of stakeholder needs are met.

Join Perseus today

Leadership & governance

Perseus has convened an outstanding constellation of stakeholders to co-design and implement the solution (more detail at https://ib1.org/perseus/governance).

Steering Group (government, national and supranational non-profits)

Commercial Members (lead Advisory and Working Groups to shape implementation)

Please contact perseus@ib1.org on any questions.

Join Perseus today

2026 links

Archive links

2025 links

2024 reports

Read reports and supporting documentation to learn about the foundations of the programme.

Learn more

Join — 2026 Perseus membership

In 2026 Perseus is moving to market implementation, driven by its members. As a member, your organisation will influence the future of embedded sustainable finance, emissions reporting and data sharing across the economy. Membership enables: IB1 acts as the (non-profit) implementation partner, with oversight from an independent Delivery Oversight Committee, and Steering Group (https://ib1.org/perseus/governance). NB: […]

Members
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In 2026 Perseus is moving to market implementation, driven by its members. As a member, your organisation will influence the future of embedded sustainable finance, emissions reporting and data sharing across the economy.

Membership enables:

  1. Your needs to be included in the design and implementation
  2. Direct influence in design and implementation via Advisory Groups and Working Groups
  3. Direct engagement in, and integration with, the 2026 development
  4. Early visibility of sectoral developments, allowing you to strategically position for the future
  5. Opportunities for new relationships and collaborations
  6. Material visibility and brand opportunities
  7. Membership of the IB1 Trust Framework (additional opt-in required) and full sandbox for the Perseus Scheme implementation

IB1 acts as the (non-profit) implementation partner, with oversight from an independent Delivery Oversight Committee, and Steering Group (https://ib1.org/perseus/governance). NB: long-term pricing is co-developed with Members and approved using the Perseus governance processes.

Perseus Membership (2026 pricing)

To ensure that the programme is open and accessible to all businesses, we have made the fees flexible propose the values below. We will invoice annual fees in advance unless otherwise agreed. Alternatively, you can sign up above using with online payment.

If you have any questions or require an invoice, please contact partners@ib1.org

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Please contact us at perseus@ib1.org if you would like to discuss anything.