Renewable energy and energy efficiency technologies for wastewater treatment works in South Africa

The document outlines how mini-hydro and wind energy can be integrated into South African municipal wastewater treatment works (WWTWs) to lower energy bills and greenhouse gas emissions. Mini-hydro is presented as highly compatible with WWTW infrastructure, utilizing water flow and elevation drops to generate electricity, with a typical payback period of 5 to 10 years. Small-scale wind is described as a supplementary option to offset grid use, though it is less common due to cost and the need for multi-year wind studies. The factsheet also provides a framework for financing these projects through municipal budgets, grants, concessional loans, and energy performance contracts.

• Mini-hydro technology is well-suited for WWTWs because it can be integrated into existing plant infrastructure, specifically in drop structure locations such as headworks, aeration tanks, and clarifiers, which reduces the need for extensive civil works.
• The business case for mini-hydro installations in WWTWs typically features an internal rate of return (IRR) between 10% and 20% and a payback period ranging from 5 to 10 years.
• Small-scale wind generation has not been extensively adopted in South Africa because of its complexity and cost, requiring multi-year wind studies for project validation; capital costs for these systems range from 6,000 to 30,000 R/kWp.
• Municipalities can finance energy efficiency and renewable energy projects through several mechanisms, including municipal budgets, government or donor grants (such as MIG, RBIG, and WSIG), concessional loans from foreign funders (e.g., AFD, SEFA, DBSA), commercial bank loans, and energy performance contracts via Energy Services Companies (ESCos).

APA

GreenCape (n.d.). Renewable energy and energy efficiency technologies for wastewater treatment works in South Africa. https://greencape.co.za/wp-content/uploads/2023/08/Factsheet-8_Mini-Hydro-and-other-Alternative-Generation.pdf

Chicago

GreenCape. Renewable energy and energy efficiency technologies for wastewater treatment works in South Africa. n.d. https://greencape.co.za/wp-content/uploads/2023/08/Factsheet-8_Mini-Hydro-and-other-Alternative-Generation.pdf.

Wikipedia

{{cite report |author=GreenCape |title=Renewable energy and energy efficiency technologies for wastewater treatment works in South Africa |url=https://greencape.co.za/wp-content/uploads/2023/08/Factsheet-8_Mini-Hydro-and-other-Alternative-Generation.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{greencapendrenewable, author = {{GreenCape}}, title = {{Renewable energy and energy efficiency technologies for wastewater treatment works in South Africa}}, institution = {GreenCape}, url = {https://greencape.co.za/wp-content/uploads/2023/08/Factsheet-8_Mini-Hydro-and-other-Alternative-Generation.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }