The purpose of the final assessment stage for the Million Cool Roofs Challenge is to update the judging panel on how your cool roofs initiative has progressed since September 2019 and how you plan to scale your project, in order to determine which finalist will receive the final prize award of $750,000.


Finalists will be assessed based on the status of their projects and future plans at the end of the Challenge development period. Your project will be assessed by the judging panel against the published assessment criteria for the Million Cool Roofs Challenge, as outlined below.

The judging panel will take all four criteria into account when making their decision. This means that the team who has covered the most square metres of roofs will not necessarily win the prize; effectiveness, quality and potential for scale will also be considered.

Criteria 1 - Effectiveness

What difference does the project make to people’s lives?

We will be assessing:

  • Community impact and engagement
  • Effectiveness and durability of materials
  • The level of benefit in terms of:
    • Thermal comfort & access to cooling
    • Energy savings
    • Reduction in urban heat island effect

Criteria 2 - Project Viability

Does the entrant have a plausible project plan and the capabilities to execute it?

We will be assessing:

  1. Monitoring and evaluation plans
  2. Team capabilities
  3. Communications/dissemination strategy
  4. Budget and additional resource commitment

Criteria 3 - Scalability & Sustainability of Approach

How will the approach be sustained/embedded and grown over time?

We will be assessing:

  1. Operational or business model, including financial sustainability and impact on policy change
  2. Local capacity and collaboration (skills, supply chain, institutional support)
  3. Size of addressable market

Criteria 4 - Challenge Statement target met

Has the team deployed 1 million square meters of cool roofs?


Please complete the following documents and return them to by 9am BST on 1st August 2021:

  • The submission form (below)
  • Annex 2: The prize budget and final financial report
  • Supporting documents. Suggestions for supporting documents can be found under each question

Each question has a word limit and the total word limit is 6,050. Please do not exceed the word limit.

Nesta Challenges