@Anon155472- Another type of certification you might be interested in would be the Building Energy Assessment Professional (BEAP) Certification by ASHRAE. ASHRAE professionals are well respected in the energy and engineering world, and BEAP applies to energy management in the built environment. BEAP certified professionals are certified to assess residential, commercial and industrial buildings.
This would be a great certification to pursue if you want a job making energy conservation recommendations to clients regarding their buildings. The prerequisites are just as high as those for the CEM, but the certification lets clients know that you have meet these stringent requirements and have been tested in every aspect of energy conservation.