Optimum Energy, which makes software to reduce energy consumption in commercial buildings, has raised $1.5M of a $5M debt round. The company says its software, which manages a building’s heating, ventilation and air conditioning systems, can reduce energy consumption by 30 to 60 percent. Just this week, Optimum announced that the Rockefeller Group received a $557,370 rebate check for improving energy efficiency, in partnership with Optimum and LVI Energy, in its Rockefeller Center building in New York (TechFlash). Also, Ben Erpelding was named vice president of engineering and solutions architecture. Erpelding has been director of engineering since 2007.