This bill mandates the Comptroller General of the United States to undertake a comprehensive study on how Federal agencies utilize renewable energy certificates (RECs) . The study will specifically evaluate whether the aggregate market demand for RECs genuinely leads to new investments in renewable energy generation capacity and assess Federal agencies' progress in meeting clean energy directives, including those from Executive Order 14057. It will also compare RECs, power purchase agreements , and onsite renewables as means for agencies to comply with the Energy Policy Act of 2005, considering cost differences and compliance risks. Furthermore, the Comptroller General must analyze the average costs agencies incur when using RECs for both existing and new renewable energy projects, and project costs if agencies exclusively relied on RECs, PPAs, or onsite renewables for new projects. Upon completion, a detailed report will be submitted to Congress, outlining the study's findings and offering recommendations for legislative and administrative actions to enhance the impact of the REC market on Federal renewable energy investments.