Ameresco Insights
Ameresco Secures Position on RE:FIT 5 Framework, Expanding Public Sector Decarbonisation Delivery Across the UK
Published May 27, 2026
Ameresco has been selected for the RE:FIT 5 framework, reinforcing its role as a leading energy solutions provider supporting UK public sector organisations to decarbonise their estates.
This procurement framework, launched by the Mayor of London in April 2026, enables councils, education and healthcare institutions, and other public organisations to accelerate progress toward net zero. RE:FIT 5 represents a significant evolution of the framework. Having already supported public sector organisations through RE:FIT 4, Ameresco is pleased to continue as part of RE:FIT 5 – now with an even broader and more flexible offering.
The framework’s performance‑based financing structure, alongside the inclusion of social housing and new Direct Award options, creates greater accessibility and speed for organisations looking to accelerate decarbonisation and infrastructure delivery.
What Is the RE:FIT 5 Framework?
The RE:FIT framework uses Energy Performance Contracts (EPCs) to secure funding for investing in new and improved energy efficiency systems and technologies – such as heat networks, heat pumps, solar systems, lighting retrofits, insulation, and controls. It is a recognised public sector procurement route designed to help organisations deliver energy efficiency, renewable energy, and decarbonisation projects through performance-based contracting.
RE:FIT 5 builds on earlier iterations by:
- Expanding eligible technologies and project scopes
- Increasing flexibility in funding and delivery models
- Supporting a wider range of public sector organisations
Ameresco’s Track Record on RE:FIT: Proven Delivery at Scale
Ameresco has delivered multi-site, multi-phase decarbonisation programmes through the RE:FIT framework for more than a decade, helping public sector organisations across the UK reduce emissions, enhance performance, and drive long-term savings. A sampling of projects leveraging RE:FIT frameworks are below:
- Beckfoot Trust: Energy efficiency and renewable technologies across education estates, demonstrating the flexibility of RE:FIT for the education sector. ➞
- Carmarthenshire County Council: Estate‑wide energy efficiency and renewable upgrades to support the Council’s net zero by 2030 target. ➞
- Manchester City Council: Large-scale energy efficiency and renewable upgrades across multiple sites, supporting the Council’s net-zero ambitions. ➞
- Merthyr Tydfil County Borough Council: Extensive energy conservation measures across council buildings, supporting Wales’ public sector carbon neutrality ambitions. ➞
- Pembrokeshire County Council: Estate-wide decarbonisation measures to improve energy performance while reducing long-term operating costs. ➞
- Royal Marsden Hospital: Energy efficiency and cogeneration upgrades to modernise critical NHS hospital infrastructure. ➞
- Swansea Council: Estate-wide energy efficiency and renewable upgrades, reducing carbon emissions and energy costs while optimising Council facilities. ➞
- University of West London: Campus‑wide decarbonisation upgrades across multiple sites, integrating low‑carbon heating and renewable energy. ➞
Why RE:FIT 5 Matters for Public Sector Organisations
The launch of RE:FIT 5 marks an exciting step forward. The expanded framework broadens the scope of delivery and enables access to new project types, sectors, and enhanced delivery flexibility. By building on previous frameworks and introducing options aligned to today’s decarbonisation priorities, RE:FIT 5 will help organisations accelerate progress toward net-zero goals.
RE:FIT 5 enables organisations to:
- Access compliant procurement without lengthy tender processes
- Deliver guaranteed performance and measurable outcomes
- Unlock innovative funding solutions
- Address ageing infrastructure while progressing net zero commitments
- Remove barriers that previously delayed or prevented decarbonisation projects
What is RE:FIT 5?
RE:FIT 5 is the latest iteration of the UK public sector RE:FIT procurement framework, developed by the Mayor of London to enable organisations to deliver energy efficiency, renewable energy, and decarbonisation projects through compliant Energy Performance Contracts that support net‑zero delivery.
Who can use the RE:FIT 5 framework?
RE:FIT 5 is available to public sector organisations across the UK, including local authorities, education institutions, healthcare bodies, housing providers, and other publicly funded organisations seeking to decarbonise their estates.
What types of projects can be delivered through RE:FIT 5?
RE:FIT 5 supports a wide range of projects, including energy efficiency upgrades, low‑carbon heating, renewable energy generation, building controls, lighting and insulation improvements, and estate‑wide decarbonisation programmes across single or multiple sites.
How does RE:FIT 5 support project funding?
RE:FIT 5 uses Energy Performance Contracts, enabling projects to be funded through performance‑based savings and structured financing approaches that help organisations reduce upfront capital requirements while managing delivery and performance risk.
Is Ameresco an approved provider on the RE:FIT 5 framework?
Yes. Ameresco has been appointed as an approved provider on the RE:FIT 5 framework, allowing public sector organisations to procure decarbonisation and energy infrastructure projects through this compliant route.
Has Ameresco delivered projects through RE:FIT before?
Yes. Ameresco has delivered multiple public sector projects through previous RE:FIT frameworks for more than a decade, including council estates, education facilities, and multi‑site decarbonisation programmes across the UK.
What makes RE:FIT 5 different from earlier RE:FIT frameworks?
RE:FIT 5 expands eligibility, broadens technology scope, and introduces greater delivery flexibility and streamlined call‑off options, reflecting today’s net‑zero, infrastructure renewal, and pace‑of‑delivery requirements.
How can organisations engage with Ameresco through RE:FIT 5?
Public sector organisations can engage with Ameresco through the RE:FIT 5 framework to explore compliant procurement options, develop decarbonisation strategies, and deliver performance‑based energy and infrastructure projects.