This report, supported by the International Renewable Energy Agency (IRENA) and the International Climate Initiative (IKI), highlights the importance of renewable energy solutions in cities for the urban future. It emphasizes the need for sustainable use of all forms of renewable energy, including bioenergy, geothermal, hydropower, ocean, solar, and wind energy, to achieve sustainable development, energy access, energy security, and low-carbon economic growth. The report also suggests that the widespread adoption of renewable energy solutions in cities can help to address the challenges of climate change and energy poverty.