The mining and industrial sectors in South Africa contribute a staggering 67% combined electricity market share of Eskom’s capacity, with the balance shared between the residential, agricultural, commercial and transport sectors.
According to the handbook Energy Efficiency Made Simple 2009, South Africa’s energy intensity is high because of the country’s economic structure – we have highly energy intensive industries such as deep level mining and metal smelters. However, only about 18% of the 67% of energy consumed is by the mining sector, with the balance of almost 50% accounting for industrial use.
According to GL Radke from Siemens in an article published in September 2004, internationally, about 70% of all electrical energy used by mining and industry is employed to run motors. Motors drive pumps, fans, air compressors, conveyors, etc. Therefore, any interventions to improve energy efficiency should warrant careful consideration of motor-driven loads within a plant.
This is all good and well. Where do we start to translate energy efficiency into a favorable bottom line?