Solar energy experts at Denver-based Conergy Americas and officials at California’s South San Joaquin Irrigation District (SSJID) have installed what they say is the world’s first single-axis solar tracking system featuring thin-film photovoltaic cells. The 419-kilowatt system went live in late March. It is the second phase of a 1.6 MW solar energy solution that will save the irrigation district nearly $400,000 a year in utility costs, allow it to collect millions of dollars in state...