Sunrun, a publicly traded solar company, is dialing back its Colorado operations. The San Francisco-based firm is laying off approximately 100 people, the majority of whom work in an Arvada office, Sunrun spokesman Wyatt Semaneck said in an email. He added that represents about 1 percent of the company’s overall workforce. Sunrun also will not take on any new projects in the state, a sales representative told BusinessDen on Wednesday.