Løren School Leads the Way in Green Roof Solar Innovation

Løren School Leads the Way in Green Roof Solar Innovation

© Sempergreen Services and BrightView 

Løren Elementary School in Oslo has taken a significant step toward sustainability by integrating solar energy technology with its existing green roof. The challenge was to install solar panels while preserving the biodiversity and structural integrity of the roof. Thanks to a collaboration between Sempergreen and Over Easy Solar, an innovative solution was implemented: lightweight vertical PV units that enhance energy output without compromising the Sedum roof. This groundbreaking renovation sets a new standard for urban sustainability.

Advancing Sustainable Education
With 750 students, Løren Elementary School prioritizes environmental responsibility. In 2022, the school aimed to advance its sustainability efforts by transforming its green roof into an energy-generating ecosystem. The goal was to maintain biodiversity while harnessing solar power, ensuring a functional and eco-friendly learning environment.

Overcoming Challenges with Smart Design
The biggest hurdle was finding a lightweight solar solution that seamlessly integrated with the existing Sedum roof while staying within the building’s load-bearing limits. The school needed a system that preserved the greenery’s quality, efficiently produced energy, and utilized cutting-edge technology.
Løren School is now a role model for urban sustainability, demonstrating that solar energy and rooftop biodiversity can coexist.

Sempergreen & Over Easy Solar’s Unique Approach
In partnership with Over Easy Solar, Sempergreen provided a lightweight, prefabricated VPV system specifically designed for green roofs. This innovation not only facilitated smooth integration but also enhanced the performance of both the Sedum vegetation and the solar panels.

How the System Works

  • Vertical Double-Sided Solar Panels: Capture sunlight from both sides, maximizing energy production.
  • Cooling & Reflective Effects: The Sedum roof cools the panels, while its reflective properties (albedo effect) boost efficiency.
  • Biodiversity Protection: The system ensures the green roof remains healthy and functional under the panels.

Project Highlights

  • Smart Synergy: The Sedum roof enhances solar panel performance while thriving beneath the PV units.
  • Lightweight & Load-Friendly: The system weighs only 51 kg/m² when fully saturated, ideal for weight-sensitive structures.
  • Fast & Easy Installation: Ballast-free design allows quick assembly without mechanical fastenings.
  • Scalability & Growth: Following the successful 2022 pilot, the project expanded in 2023, reaching 46 kWp across 500 m².
  • Urban Sustainability Model: A leading example of how cities can integrate green roofs and renewable energy.

Delivering Energy-Efficient Results
The combination of green roofs and vertical PV panels has produced impressive results. The 2022 pilot demonstrated high energy yields, and surprisingly, the quality of the green roof improved beneath the panels compared to uncovered sections. Encouraged by these outcomes, the school expanded the project in 2023, solidifying its commitment to sustainability.

The unique VPV system from Over Easy Solar optimizes energy production by balancing output throughout the day, reducing CO₂ emissions, and increasing overall efficiency.

Løren School’s green roof solar project is a shining example of how urban spaces can embrace sustainability without compromise, leading the way for future innovations.

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