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The GSA Net Zero Renovation Challenge aims to move beyond shallow retrofits by leveraging ESPCs to achieve deep energy savings (over 50%) and net zero energy in a portfolio of 30-35 federal buildings. A workshop convened by RMI and GSA identified key barriers to this goal, including long procurement timelines, high financing costs, and a lack of integrative design. Proposed solutions include streamlining the ESCO selection process from 18 months to approximately 8 months, blending appropriated funds with ESPC financing, and adopting a 'right steps in the right order' approach that prioritizes load reduction before selecting HVAC and renewable systems. The challenge evaluates projects based on absolute energy savings, technical and financial creativity, and progress toward EISA 2007 goals.