KARACHI - Power supply from the Karachi Nuclear Power Plant (Kannup) has finally been restored.     The plant, which was closed down last week due to helium gas leakage, will initially supply 50 megawatts of power to the City; which is in the grip of excessive loadshedding for the past couple of weeks. The inhabitants of certain areas of the City spent sleepless nights since last Wednesday, when Kannup had closed down. As the prevailing power crisis aggravated in the metropolis due to an abrupt shutdown, riots erupted in Mauripur area.   The Karachi Electric Supply Company carries out six to eight hours of loadshedding in almost every locality of the City on rotational basis. The gravity of the crisis could be gauged from the fact that the power utility resorted to loadshedding even in industrial areas to bridge the demand and supply gap. Areas including Federal B Area, Gulshan-e-Iqbal, Gulistan-e-Jauhar, Bahadurabad, PECHS, Liaquatabad, Buffer Zone, North Nazimabad, Nazimabad, North Karachi, Model Colony, Orangi Town, Jamshed Road, Gulshan-e-Maymar and Sohrab Goth experienced prolonged power failures. It is pertinent to mention that when the Kannup had closed down, the City was facing power shortage of 430 megawatts per day. The demand of the City ranges between 2200-2400 megawatts. Hence many areas had plunged into darkness. However, it is hoped by the general public that the resumption of power supply from the Kannup to the KESC, will help in minimising the duration of loadshedding.