Engineered Systems, Jul. 2014, by Timothy Coyle. Free registration required to view full-text.)
http://www.esmagazine.com/articles/96636-size-matters-trends-in-standby-power-systems-for-health-care-facilities

"These days, designs are favoring higher total system capacities, larger generators at higher output voltages integrated into “campus-type” power distribution systems, and security. Review design approaches, lessons learned, and relevant codes."