W.H. Appleby presented a paper on "The possibilities of electric power as applied to the mining industry of the Witwatersrand" before the South African Association of Engineers in April 1907. His paper appears to have been stimulated by the announcement of the amalgamation of the Victoria Falls and Vereeniging power schemes. He showed that if power could be purchased by the mines for less than a penny per kilowatt-hour their power costs would decline considerably. Papers such as this did much to influence the mining industry in replacing steam driven plant with electrically driven machinery, thus creating a need for central power stations.