"The second iteration of the Energy Toolkit, a collection of leading instruments and methodologies for climate-compatible energy planning, offers energy practitioners, policymakers, and experts a quick reference guide to some of the best-established instruments available at no or low cost. The result is a compilation of 26 tools from agencies around the world. The toolkit was produced as a team effort with the many members of the Low-Emissions Development Strategies Global Partnership (LEDS GP), in particular its Energy Working Group (LEDS EWG). The LEDS GP was founded in 2011 to facilitate peer learning, technical cooperation, and information exchange to support the formation and implementation of low emission development strategies. It has a focus on supporting developing countries and regions. It engages leaders from over 300 institutions across government agencies, technical institutes, international agencies, and non-governmental organizations. The LEDS EWG promotes sustainable and climate-compatible development in the energy sector through a work program focused on peer-to-peer learning, technical assistance, and enhanced opportunities for coordination and collaboration between LEDS GP members. The LEDS EWG also produces supporting materials, such as best-case studies or reference guides like the one presented here. This toolkit does not claim to be a complete encyclopedia of all available tools. We hope to update and further improve the toolkit in coming years. If you have developed a sustainable energy modelling tool or know of one that should be featured here, please contact us at [email protected]. Thank you! We hope this toolkit will help you to make energy fairer, safer, and greener for all..."