How to reconcile renewable energy and agricultural production in a drying world

Abstract

Societal Impact Statement Renewable energies such as photovoltaics can mitigate climate change by replacing fossil fuels, but they will compete with other forms of land use when implemented in open space. Agrivoltaics provide a promising approach to reconciling food and energy needs by allowing for agricultural and electrical power production on the same area of land. Agrivoltaics have a high potential to attenuate negative effects of drought on crop growth and, thus, can help to increase resilience of agricultural production under increasingly variable environmental conditions. This drought attenuation potential will be especially relevant for regions where drought and population growth co‐occur. Summary Water scarcity is threatening food security and other, plant‐related ecosystem services. Renewable energy production provides a sustainable strategy to replace fossil fuel and, by this, mitigate climate change. However, common forms of renewable energy production such as photovoltaics in open space directly compete with agriculture. Agrivoltaics are proposed as a promising technology to reconcile food and energy needs by allowing for agricultural and electrical power production on the same area of land. However, general understanding of the potential of agrivoltaics to facilitate crop yield under changing climatic conditions is lacking. In this study we provide an overview on the effects of agrivoltaics on microclimate and crop growth and yields. We furthermore quantify the global potential of agrivoltaics to attenuate drought effects on crops and develop a conceptual framework for evaluating interactions between solar power and agricultural production under changing climatic conditions. Generally, shading by agrivoltaics will reduce yield in comparison to maximum possible yield under unshaded, well‐watered conditions but can reduce interannual variation in yields caused by drought, thus, increase resilience of agricultural production. This drought attenuation potential of agrivoltaics seems to be especially promising in the drought prone regions of the world. Land use efficiency of agrivoltaic systems is directly linked the degree of crop shading which covaries with the drought attenuation potential but will ultimately be guided by political decisions on how to weight energy production vs. food security. The latter depends on economic, societal and ecological aspects related to the implementation of agrivoltaics.

Keywords

• climate change
• drought
• drought mitigation
• dual land use
• food security
• land sharing