Capehart, B. L. ., Salas, C. E. ., Turner, W. C. ., & Parker, S. A. . (2003). N EW C ERTIFICATION PROGRAM AVAILABLE FOR DISTRIBUTED G ENERATION AND COMBINED HEAT AND P OWER P ROFESSIONALS. Distributed Generation &Amp; Alternative Energy Journal, 18(3), 71–80. https://doi.org/10.13052/dgaej2156-3306.1833