Financial market participants and corporations are increasingly driven by evolving sustainability regulations, seeking reliable and accessible information on their stakeholders’ sustainability practices. To foster a shared understanding of environmental sustainability among companies, investors, and policymakers, the European Commission introduced the EU Taxonomy—a classification system for environmentally sustainable economic activities within the EU. Under this regulation, financial market participants and corporations must disclose the extent to which their activities align with the Taxonomy criteria. However, the EU Taxonomy poses an indirect challenge for small and medium-sized enterprises (SMEs), which often serve as part of the supply chain for corporations and seek financing from financial market actors. Their limited resources and knowledge in this area make compliance a significant challenge. Therefore, the CONFESS project aims to address this challenge by developing a conformity scheme specifically for clean energy SMEs, based on the EU Taxonomy. This project seeks to improve access to sustainable financing for these SMEs, positioning the conformity scheme as a key tool for financial market participants to evaluate the sustainability of energy investments and support the growth of sustainable energy investments. To ensure the conformity scheme’s affordability and practicality for SMEs while providing financial market actors with essential information, the project will involve close collaboration and pilot testing with financial institutions, certification bodies, and relevant SMEs in Germany, Italy, and Czechia.