(Francisco Kjolseth | Tribune file photo) Artspace Solar Gardens at 850 S. 400 West in Salt Lake City, which opened in August 2013, is the first net zero mixed-use energy building with onsite solar production in the state of Utah. Next year will be consumers’ last chance to take advantage of a sizable federal rebate for new solar installations, and cash incentives available through Rocky Mountain Power could be coming to an end as well.