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Building energy resilience in Western Cape wastewater treatment works
The Hartenbos wastewater treatment works (WWTW) in the Western Cape has implemented a hybrid microgrid consisting of solar PV and battery energy storage (BESS) to ensure operational continuity during loadshedding. The system, completed in September 2025 with a cost between R100 million and R112 million, allows the facility to island from the grid, reduce diesel reliance, and export surplus power. The project serves as a model for other municipalities to stabilize critical services and lower energy expenditures through embedded renewable energy.
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Document type: Case study
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