The problems stemmed from a decision decades ago that allowed the Empresa de Energia de Bogota, a city-owned electricity company, to reroute the Bogota River...to supply water for two hydroelectric generating plants...Now, the Bogota River is a stew of industrial waste, heavy metals and raw sewage...The power plants are now operated...by the multinational corporation Emgesa, which is controlled by Spanish electricity giant Endesa and majority-owned by Empresa de Energia de Bogota...Emgesa said it is not responsible for Muna's river-derived pollution.