WENDELL ROELF SOUTH African power utility Eskom said police were investigating whether an attempt was made to poison its outgoing Chief Executive Officer Andre de Ruyter. Public Enterprises Minister Pravin Gordhan also told Reuters on Sunday the alleged incident "will be thoroughly investigated" and anyone responsible charged. Without giving any details, Gordhan said an intense battle was taking place "between those who want South Africa to work and thrive and those who want to corruptly enrich themselves". Faced with political pressure, De Ruyter resigned on December 14 after failing to solve a crisis in Eskom that has led to record power cuts…