The Clean Energy Demonstration Transparency Act of 2025 amends the Infrastructure Investment and Jobs Act to enhance oversight and transparency for clean energy demonstration projects. It mandates that the Secretary submit detailed reports to relevant congressional committees and make them publicly available online. These reports are required semiannually, beginning six months after the bill's enactment, and must cover each demonstration project administered or supported by the program. Key information to be included for each project comprises initial contracts or financial assistance agreements, a list of met or unmet material milestones , and any material modifications to the project's scope, schedule, funding, partners, or budget. The bill also allows the Secretary to streamline these new reporting requirements by synchronizing them with other existing reports.