The International Renewable Energy Agency (IRENA) and Aalborg University have released guidelines for integrating low-temperature renewable energy sources into district energy systems. The guidelines provide policy makers with information on how to effectively integrate these sources into existing district energy systems, including considerations for planning, financing, and operation. The guidelines also highlight the potential benefits of integrating low-temperature renewable energy sources, such as increased energy efficiency and reduced greenhouse gas emissions. Overall, the guidelines are intended to support the transition to a sustainable energy future and promote the widespread adoption and sustainable use of renewable energy sources.