Iran's nuclear chief says his country needs 20 industrial-scale uranium enrichment facilities, a dramatic expansion in defiance of U.N. demands it halt the program. Ali Akbar Salehi's announcement comes days after the Iranian government approved a plan to build 10 new uranium enrichment plants. The official IRNA news agency quotes Salehi as saying Iran needs the 20 sites because it aims to generate 20,000 megawatts of electricity through nuclear power plants over the next 20 years.