(Reuters) – Zimbabwe’s main hydro power dam could stop producing electricity in six months if water levels keep falling after the nation’s worst drought in more than two decades, an official said on Friday. Zimbabwe and neighbouring Zambia both rely heavily on the Kariba dam for electricity , and falling dam levels at the plant raises the threat of deeper power cuts in the two countries which are already faced with frequent power shortages. Kenneth Maswera, Kariba Power Station’s general manager told reporters that dam levels were at 12 percent of capacity, a level last recorded in 1992 during a severe drought.