Holde, D. V. ., and J. . Gregerson. “The ‘Virtual Electric Utility’ via Advanced Energy Control and Communications Systems: Backup Generation Offers a Surprisingly Large, Untapped Resource”. Distributed Generation &Amp; Alternative Energy Journal, vol. 17, no. 2, Mar. 2002, pp. 6-26, doi:10.13052/dgaej2156-3306.1721.