This case study showcases how the installation of solar photovoltaic (PV) panels at a water treatment plant in Rajkot has reduced greenhouse gas emissions and inspired the municipality to scale-up in other parts of the city. Cities represent almost two-thirds of global energy demand, accounting for almost 70 percent of energy-related greenhouse gas emissions that contribute to climate change. Water supply services in particular can be highly energy intensive. In Rajkot, an industrial city in the state of Gujarat in western India, water supply accounted for 61 percent of all municipal electricity consumption from 2015-16. The Rajkot Municipal Corporation installed PV panels at the Aji water treatment plant, providing nearly one-fifth of the plant’s power needs. Following this success, the municipality has commissioned a study to assess the feasibility of using solar PV systems in other water treatment plants in Rajkot, and is currently developing a project for two water treatment and two sewerage plants.