District Energy, 2nd Quarter 2014, by Stan Gent. (Free registration required to view full-text of article.)
http://www.districtenergy-digital.org/districtenergy/2014Q2/?sub_id=DOwgMT0rNL8TV#pg14

"Seattle Steam Co. has long carried the district energy torch in Seattle, from its founding in 1893 to its position today as a leader in the city of Seattle's carbon reduction efforts. The company's switch to renewable biomass fuel in 2010 helped pique the city's interest in district energy expansion....."