Synopsis As Introduced Creates the Illinois Data Center Energy and Water Reporting Act. Defines terms. Provides that, beginning January 1, 2026, all data centers operating within the State shall annually report the data center's energy and water consumption to the Illinois Power Agency for the preceding calendar year. Sets forth requirements for the content of the report. Provides that reports shall be submitted to the Agency no later than March 31 of each year. Sets forth provisions concerning data confidentiality and public access to information and the enforcement of the Act and penalties. Provides that the Agency shall conduct a comprehensive study on the impact that data centers in the State are having on rate-paying customers. Sets forth requirements for the content of the study. Provides that the Agency shall submit a report detailing the findings of the study to the General Assembly and the Governor no later than 12 months after the effective date of the Act. Sets forth rulemaking provisions for the Agency. Effective immediately.