This bill proposes significant amendments to Section 203 of the Energy Policy Act of 2005, focusing on the federal government's renewable energy procurement. It establishes a phased increase in the percentage of renewable energy that federal agencies must purchase. Specifically, the bill mandates that not less than 35 percent of energy consumed by federal agencies must be renewable in fiscal years 2030 through 2039, increasing to 75 percent for fiscal years 2040 through 2049. The ultimate goal is to ensure that 100 percent of the Federal Government's energy consumption comes from renewable sources in fiscal year 2050 and each fiscal year thereafter. Furthermore, the legislation modifies the feasibility clause, directing the Secretary to prioritize renewable energy produced: on-site at a Federal facility; on Federal lands; or on Indian land, to the maximum extent economically feasible and technically practicable. This aims to promote localized renewable energy generation for federal use.