Study Finds Floating Solar Panels on New York Ponds Linked to Higher Greenhouse Gas Emissions

A recent field experiment investigated the immediate environmental effects of placing floating solar panels on small water bodies. Researchers studied three ponds in New York where floating arrays covered 70% of the surface, comparing them to control ponds. According to published findings, the physical cover influenced greenhouse gas dynamics and water conditions during the test period.

Key Findings from the New York Pond Study

• Greenhouse Gas Emissions: Daily greenhouse gas emissions from the covered ponds increased by 26.8% in carbon dioxide equivalent.
• Gas Exchange Changes: While diffusive carbon dioxide and methane decreased due to slowed gas exchange with the atmosphere, bubbling methane emissions from the sediment increased by 57.2%, entirely offsetting those reductions.
• Dissolved Oxygen: Dissolved oxygen levels fell rapidly under the arrays, and dissolved carbon dioxide increased significantly in surface water.
• Seasonal Variation: The increase in emissions was not consistent throughout the year, with researchers noting no significant effect during cooler months.

Additional Research on Lake Maiwald

A separate study published in Scientific Reports looked at a floating photovoltaic plant on Lake Maiwald in Germany. That study observed a 73% reduction in surface sunlight and a 23% reduction in near-surface wind speed under the array, which covered 2% of the deeper lake.

Practical Implications and Verification

The study in Environmental Science & Technology Letters calculated that carbon emissions associated with these water use changes amount to 2.61 g of CO2 equivalent per kilowatt-hour, potentially increasing life-cycle estimates of floating solar by 4.0% to 6.5%. The authors suggest that impacts might be minimized by limiting panel coverage, adjusting panel angles and heights to allow airflow, and using suspended aeration equipment. Readers can verify the original research by reviewing the published paper titled "The Immediate Effect of Floating Solar Energy Deployment on Greenhouse Gas Dynamics in Ponds" in Environmental Science & Technology Letters.