The dynamic, Atlanta-based trio “Renewable Energy” will have dancers rocking and rolling to their sounds this weekend at the monthly contra dance Aug. 24 at the Saute Nacoochee Community Association’s historic gym. Members of the band include Irish fiddler Bella Issakova, concertina player Dave Marcusis and pianist Robbin Marcus. With a few collective centuries of playing for contra and other dancing, Renewable Energy is the place where hot Irish reels meet cool American jigs and bring French-Canadian fiddle tunes out for a joyride around the dance floor.