E Cube, a commissioning authority and commissioning agent (CxA), is a technical consulting company offering quality assurance and optimization services.

E Cube is a certified Small Business Enterprise (SBE) by the U.S. Small Business Administration.

E Cube services include: new building commissioning, LEED™ commissioning, CALGreen commissioning, retro-commissioning, recommissioning, energy analysis, measurement and verification, building envelope commissioning, and utility rebate programs.