In 1970, the consortium formed by the companies IECO (from the United States) and ELC Electroconsult S.p.A. (from Italy) won the international competition for the realization of the viability studies and for the elaboration of the construction project.
1970年，IECO公司（来自美国），和ELC Electroconsult S.p.A.公司（来自意大利）组成的聯盟赢得了国际竞争，为实现可行性研究和建设工程的阐述。