The Covenant of Mayors for Climate and Energy brings together local and regional authorities voluntarily committing to implementing the European Union’s climate and energy objectives in their territory. Signatory local authorities share a vision of decarbonised and resilient cities, where citizens have access to secure, sustainable and affordable energy. Signatories pledge to reduce CO2 emissions by at least 40% by 2030 and to increase their resilience to the impacts of climate change. To facilitate this process, the Covenant of Mayors provides signatories with a data compilation and reporting framework which is unique in Europe. It assists them in following a systemic climate and energy planning and in monitoring processes at the local level. The Covenant reporting and monitoring framework has been developed in close consultation with practitioners from local and regional authorities, climate and energy experts and with the methodological support of the European Commission’s Joint Research Centre (JRC). The regular process of consultation allows for the further development and refinement of the framework to ensure it aligns with the practice and methodologies most commonly used by local authorities in Europe. Over the course of 2019, the Covenant framework was aligned with the recommendations of the Common Reporting Framework by the Global Covenant of Mayors for Climate and Energy.