The U.S. Navy’s Marine Corps Base at Twentynine Palms, CA is critical to our nation’s defense. The stability of this base’s energy supply is a critical and essential element in the successful performance of base operations. To strengthen this element, a $500M base expansion included a mission critical combined heat and power (CHP) plant. The Navy considered this project an essential part of its Mission Critical Mandate for Twentynine Palms. The Vanderweil design team kept this mandate in full focus during the execution of the CHP Project. Key elements of the new CHP Plant include: a 10 MWe cogeneration plant using clean burn technology that achieved 5 ppmvd NOx emissions, high temperature hot water heat recovery boilers, and a combination of electric centrifugal and absorption chillers to meet the thermal needs of the North Main-side base expansion. Fired high temperature hot water boilers (also with clean burn technology) back up the heat recovery boilers. Redundant constant speed primary pumps and VFD driving secondary pumps feed hot water and chilled water to the base’s underground piping distribution systems. High levels of plant automation complement the design to achieve energy efficiency goals for LEED^® certification with the USGBC. Boilers and turbines are fueled with pipeline natural gas (NG) as the primary fuel, with LPG as the standby fuel. LPG storage is contained in five (5) nominal 50,000 gallon liquid LPG tanks.