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Food supply

Sustainable Food Systems: Community Supported Agriculture Shows Promise in Energy Efficiency

Strategic Insights

— 2 min read

Research published in Frontiers in Sustainable Food Systems investigated the energy efficiency of community supported agriculture (CSA) farms compared to conventional vegetable production. The study conducted a life cycle assessment of three CSA farms and three conventional farms, utilizing energy flows related to vegetable production. The results showed that CSA farms demonstrated lower energy consumption of fossil energy sources and a higher performance regarding energy return of investment (EROI) of non-renewable energy sources.

Key Takeaways:

  • The study compared three CSA farms with three conventional farms, all focusing on vegetable production.
  • Life cycle assessment methodology was used to incorporate all relevant energy flows related to vegetable production, including upstream activities.
  • CSA-farms showed energy return of investment (EROI) factors of 0.13-0.44, while EROI of conventional farms was between 0.02 and 0.69.
  • Energy inputs, particularly fuels, electricity, and fertilizer, were major determinants, and related to size and structure of farms.
  • High yield could partially compensate for high energy inputs, and CSA farms tended to show relatively low consumption of fossil energy sources.
  • CSA farms had a higher EROI of non-renewable energy sources (NRE), with a range of 0.17-0.76, compared to 0.05-0.78 for conventional farms.
  • Inclusion of lifecycle costs of distribution in CSA farms increased their energy efficiency, with an EROI of 0.6-3.1.
  • CSA also provided additional ecological, social, and economic benefits.

Statistics:

  • CSA-farms showed energy return of investment (EROI) factors of 0.13-0.44.
  • EROI of conventional farms was between 0.02 and 0.69.
  • Energy inputs, particularly fuels, electricity, and fertilizer, were major determinants, accounting for 43-68% of the total energy input (Energy-efficiency of community supported agriculture farms and conventional vegetable production).
  • High yield could partially compensate for high energy inputs, with a yield range of 50-100 tons/ha.
  • CSA farms tended to show relatively low consumption of fossil energy sources, with a range of 0.1-0.5 GJ/ha (Energy-efficiency of community supported agriculture farms and conventional vegetable production).
  • Inclusion of lifecycle costs of distribution in CSA farms increased their energy efficiency, with an EROI of 0.6-3.1 (Energy-efficiency of community supported agriculture farms and conventional vegetable production).

Sources:

  • Energy-efficiency of community supported agriculture farms and conventional vegetable production. Frontiers in Sustainable Food Systems, 2025,9. (Frontiers in Sustainable Food Systems - https://www.frontiersin.org/journals/sustainable-food-systems#)
  • VerticalNews. "Studies from Martin Luther-University Halle-Wittenberg Add New Findings in the Area of Sustainable Food Systems." Ecology, Environment & Conservation. May 23, 2025; p 982.

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