Market Brief: Green technologies for urban food production

The document evaluates green technologies for urban food production in Cape Town, categorising them into incremental and transformational levels based on Gliessman’s framework. It analyzes the financial viability of hydroponics, aquaponics, and complete Controlled Environment Agriculture (CEA) systems, while also identifying investment opportunities for different farm scales, from community gardens to large-scale commercial operations.

• Green technologies for urban food production are classified into three levels: Level 1 focuses on increasing the efficiency of current practices (e.g., sensor technology, drip irrigation), Level 2 involves substituting alternative practices and inputs (e.g., vermicomposting, cover crops), and Level 3 focuses on re-establishing agricultural production through novel growing systems (e.g., hydroponics, aquaponics).
• Among hydroponic systems, Deep Water Culture (DWC) is more financially viable than Nutrient Film Technique (NFT) systems, with a payback period of 1.36 years compared to 2.66 years, primarily due to lower setup costs and lower energy requirements.
• Small-scale commercial aquaponic systems can be financially viable, with the shortest payback period (under one year) achieved when producing only lettuce and tilapia. However, as crop diversity increases, the payback period can extend up to four years.
• High-tech complete Controlled Environment Agriculture (CEA) container systems producing basil are not viable in South Africa because electricity costs account for approximately 75.5% of operational expenses. While adding solar PV capacity or producing higher-value crops like Asian greens can move the system toward profitability, the payback periods remain largely unviable (e.g., 27.1 years for solar capacity).
• Investment opportunities in Cape Town vary by farm scale: home and community gardens are best served by low-cost interventions like non-mechanised drip irrigation and soilless growing kits; small-scale commercial farms can benefit from soil sensors and variable speed drives; and large-scale farms should focus on Level 1 and 2 technologies to increase efficiency and reduce input costs.
• Case studies of aquaponic farms in the Western Cape indicate that technical skills and water temperature control are critical for viability; only one of three studied farms showed a positive net present value by year 4, largely due to self-installation and the use of solar water heaters.

APA

Shai, T., Maseko, S., & Basson, L. (2021). Market Brief: Green technologies for urban food production. GreenCape. https://greencape.co.za/assets/Urban-Food-Production-Industry-Brief-19-July-2021-v4.pdf

Chicago

Shai, Tokelo, Sibusisiwe Maseko, and Lauren Basson. Market Brief: Green technologies for urban food production. GreenCape, 2021. https://greencape.co.za/assets/Urban-Food-Production-Industry-Brief-19-July-2021-v4.pdf.

Wikipedia

{{cite report |last1=Shai |first1=Tokelo |last2=Maseko |first2=Sibusisiwe |last3=Basson |first3=Lauren |title=Market Brief: Green technologies for urban food production |publisher=GreenCape |date=June 2021 |url=https://greencape.co.za/assets/Urban-Food-Production-Industry-Brief-19-July-2021-v4.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{shai2021market, author = {Shai, Tokelo and Maseko, Sibusisiwe and Basson, Lauren}, title = {{Market Brief: Green technologies for urban food production}}, institution = {GreenCape}, year = {2021}, month = jun, url = {https://greencape.co.za/assets/Urban-Food-Production-Industry-Brief-19-July-2021-v4.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }