Solar Arrays Can Aid Grasslands During Drought — New Research - CleanTechnica

New research conducted at Jack’s Solar Garden in Longmont, Colorado, reveals that solar panel arrays in semi-arid grasslands can reduce water stress and improve soil moisture, leading to increased plant growth—particularly during drought conditions. Over four years, researchers observed that partial shading from photovoltaic (PV) panels and water runoff from the panels helped grasses survive harsh summer months, with growth on the east side of panels increasing by up to 90% compared to open fields during dry years. Even in normal or wet years, grass productivity remained higher near the panels. This study is the first to field test how co-locating solar arrays with grasslands affects ecosystem dynamics, highlighting potential benefits for renewable energy development and ecosystem stability in drought-prone regions. The research, led by Colorado State University scientists including Matthew Sturchio and Knapp, emphasizes that although the solar array was designed primarily for energy generation, it inadvertently created a more favorable environment for grasses during dry periods. The findings suggest that modifying solar panel design—such as adjusting panel positioning to optimize shade and light exposure—could further enhance water use efficiency and plant growth. The study focuses on perennial C3 “cool season” grasses, with plans to extend research to C4 grasses common in Colorado’s plains, which thrive in warmer, sunnier conditions. This work contributes to understanding how agrivoltaics can support both renewable energy goals and grassland ecosystem health amid increasing drought and climate change challenges.