RGS Energy, the parent of Hawaii-based Sunetric, is seeing better performance from its subsidiary mainly due to the increased approvals of rooftop solar energy systems by Hawaiian Electric Co., the Colorado-based firm said in a public filing on Monday. RGS Energy said its gross margin for its Sunetric segment was 19.6 percent in the third quarter, down from 21 percent in the previous quarter and an increase from 4 percent in third quarter of 2014. The pattern of increases primarily reflects increased...