Cooling the Concrete Jungle—UN Endorses Tamil Nadu’s Roof Revolution

Updated: June 17, 2025 13:54

Image Source: Lawsisto

Tamil Nadu’s innovative “Cool Roof” initiative has earned international acclaim, with the United Nations Environment Programme (UNEP) spotlighting it as a model for climate resilience and urban heat mitigation. The project, piloted in Chennai’s Perumbakkam neighborhood, is now being hailed as a scalable solution for cities grappling with rising temperatures and the urban heat island effect.

Project Overview: What Is the Cool Roof Initiative?

Location: Lighthouse Project site, Perumbakkam, Chennai
Partners: Tamil Nadu State Government, UNEP-led Cool Coalition, Rocky Mountain Institute
Technology Used: Silka Cool Roof Paint with a Solar Reflective Index (SRI) of 102
Scope: Applied to two residential blocks (200 homes) in affordable housing
Impact: Achieved 5–8°C reduction in indoor temperatures in peak summer months

Why It Matters: Addressing Urban Heat

Chennai’s Challenge: Dense high-rises, limited green cover, and concrete sprawl make it highly vulnerable to heatwaves
Heat Island Effect: The city’s built environment traps heat, raising ambient temperatures significantly
UNEP’s Findings: Passive cooling strategies like cool roofs can reduce urban heat by up to 4°C and cut heat-related illnesses by 15–30%

Global Recognition & Replication

UNEP Endorsement: Featured in UNEP’s latest report on climate innovations
Scaling Up: Incorporated in the master plan of Chennai and being scaled up in Tamil Nadu
Inspiration for Others: Delhi retrofitting Kashmere Gate bus depot with a 150,000 sq. ft. cool roof to accommodate 100,000 daily commuters

Broader Impact & Future Plans

National Integration: Passive cooling features being integrated into 10 million houses under the Pradhan Mantri Awas Yojana–Urban (PMAY-U)
Financing Mechanisms: UNEP and their stakeholders are developing funding models to support the adoption of cool roofs in social housing
India's Leadership: UNEP calls India a "global champion of passive cooling", citing its incorporation in national urban policy

Sources: The Hindu Business Line

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