Solar Panels, Green Roofs & Urban Biodiversity | Rethink What Matters Podcast

In this episode of Rethink What Matters, Paul is joined by Alan Burchell from Urban Strong to explore the innovative combination of solar panels and green roofs and how these systems can transform urban environments into more sustainable, resilient, and biodiverse spaces.

Alan shares his journey from working within the wind energy sector to becoming passionate about green roofing and sustainable urban infrastructure. He explains how Urban Strong was founded with the goal of bringing nature back into dense urban environments, helping counter the environmental and psychological impacts of concrete-heavy cities.

The conversation explores the growing integration of solar energy systems with green roof technology and why the two solutions work so effectively together. Alan explains that while solar panels generate renewable energy, they also lose efficiency as surrounding temperatures rise. Green roofs help solve this issue through evapotranspiration, a natural cooling process where vegetation lowers the temperature around the panels, improving energy performance.

Paul and Alan discuss how this cooling effect can increase solar panel efficiency by as much as 6–12% during hot weather, making solar-integrated green roofs both environmentally and economically beneficial. Rather than competing for rooftop space, Alan explains that solar panels and green roofs can become highly complementary systems when designed correctly.

The episode also highlights the biodiversity benefits of green roof systems. Alan explains how Urban Strong carefully selects low-growing, shade-tolerant, and drought-resistant plant species that support pollinators and urban wildlife while avoiding interference with solar energy production. Diverse planting strategies create miniature ecosystems that improve ecological resilience and contribute positively to urban biodiversity.

The discussion addresses common misconceptions surrounding solar-integrated green roofs, particularly concerns around maintenance and water use. Alan explains how these systems are designed to operate efficiently with minimal maintenance, often using rainwater redirected from solar panels to naturally irrigate vegetation below.

Paul and Alan also explore the structural and engineering innovations behind these installations. Urban Strong uses the weight of the green roof system itself to ballast solar racking, reducing the need for roof penetrations and helping protect building membranes while improving stormwater management in urban areas.

A major theme throughout the episode is the broader role green infrastructure can play in improving human wellbeing. Alan reflects on research showing that even small connections to nature can positively impact mental and physical health, reinforcing the importance of integrating greenery into urban design.

The conversation concludes with a look towards the future of sustainable cities. Alan believes solar-integrated green roofs will continue growing in popularity as cities increasingly prioritise climate resilience, biodiversity, stormwater management, renewable energy, and healthier urban living environments.

This insightful episode offers a compelling exploration of how combining renewable energy with nature-based infrastructure can create smarter, greener, and more resilient cities while supporting both environmental sustainability and human wellbeing.