Energy savings performance contracts (ESPCs) have become a key mechanism for energy efficiency upgrades in recent years, with the federal market now exceeding $1 billion in gross annual revenue. ESPCs allow federal agencies to partner with an energy service company (ESCO) in order to complete energy savings projects without upfront capital costs or Congressional appropriations.This report showcases eight case studies that highlight best practices in federal ESPCs. Highlighted projects—including seven federal and one municipal project— cumulatively exceed 600 billion BTUs in energy savings, with an average 58% energy use reduction.