The Sustainable Digital Infrastructure Alliance (SDIA) provides comprehensive feedback on the European Union's Delegated Act for a common Union rating scheme for data centers. Emphasizing the need for holistic indicators that span resource inputs to IT equipment and network traffic impacts, SDIA advocates for earlier reporting deadlines to monitor infrastructure growth effectively. The Alliance calls for greater transparency, advocating for the public release of detailed environmental performance data to foster accountability, enable civil society research, and support sustainable digital economy development. Through its suggestions, SDIA aims to strengthen the draft in alignment with EU goals for sustainability and transparency.