This prerequisite establishes the project’s energy performance so that the project can demonstrate a commitment to energy efficiency. The energy use of a LEED-CI project, in terms of the ASHRAE 90.1–2007 standard, must meet four distinct requirements: 

ASHRAE 90.1-2007 – Mandatory Requirements 
ASHRAE 90.1-2007 – Prescriptive Option or Performance Option 
Lighting Power Density Reduction of 10% 
Energy Star-labeled Equipment and Appliances - 50%