Congo miners could save $1 bln a year with new power project, Trafigura executive says ↧ ↧ Congo miners could save $1 bln a year with new power project, Trafi... Miners in Congo's Copperbelt could save about $1 billion annually by replacing diesel generation with imported electricity under a planned transmission project aimed at easing power shortages, commodities company Trafigura's Congo ​head told Reuters.