The book is a work presented for award of Master Of Science in Physics. It covers space weather with respect to Geomagnetically Induced Currents,specifically on the power grid in Nairobi, Kenya. The method employed is the plane wave model of calculating geoelectric fields. The work employed Magnetic data obtained from the Magnetometer at University Of Nairobi together with data from Kenya Power Company. The research was conducted for the solar minimum year of 2009.