This collection consists mainly of records pertaining to the operations of the company, including annual reports and monthly and operating reports for electricity, gas, and steam. Of special interest are photocopies of public records about the Brush-Swan Electric Company, which preceded the company, and an 1879 letter about the future outlook for electricity. Newsletters from Public Service Commission of Colorado newsletters reveal much information about early Depression era and post-war era utility developments, public relations, and utility services offered (including selling and maintenance of household appliances). A large collection of photographs has been placed in the historical photograph collection (see P2004-1).