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Wastewater ponds may seem an unlikely place to look for solutions to New Zealand's electricity security crisis. But their underutilized surfaces could help tackle two problems at once—high power prices and algal growth.

Floating solar panels on wastewater ponds offer a multifaceted answer. They generate renewable energy, improve water quality in the treatment ponds and reduce costs.

Leading this approach is the 2020 installation of New Zealand's first floating solar array at the Rosedale wastewater treatment plant in Auckland. This project demonstrates how New Zealand could double the country's power supply without requiring additional land. It serves as a test for future deployments on other reservoirs and dams.

The project comprises 2,700 solar panels and 4,000 floating pontoons. It covers one hectare of the treatment pond, making excellent use of a marginal land asset in a dense urban environment.

The floating solar array generates 1,040 kilowatts of electricity and reduces 145 tons of carbon dioxide annually. It also saves NZ$4.5 million in electricity costs per year. The electricity it generates, alongside biogas co-generation, meets 25% of the plant's energy needs.

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