Located midway between Itaipú and Yacyretá
on the Río Paraná was the proposed site
of the Corpus hydroelectric power plant. After years
of preparations, Corpus remained in the planning stage
in the late 1980s because of the slow progress at Yacyretá.
Hydrologically linked with Itaipú and Yacyretá,
the Corpus plant was designed to make optimal use of
the falls at Itaipú and the currents of tributary
rivers. In order to integrate and maximize the various
projects along the Río Paraná, in October
1979 Paraguay, Argentina, and Brazil signed the Itaipú-Corpus
Accord, which set specific regulations for the projects
and improved communication among the countries. Although
planning was still not final in 1988, Corpus was expected
to be comparable in size to Yacyretá. When operable,
Corpus would raise Paraguay's electricity output to
an estimated 300 times its domestic demand. Beyond Corpus,
Argentina and Paraguay also planned several smaller
hydroelectric power plants downstream from Yacyretá,
including Itatí-Itá-Corá and others.
Future hydroelectric development along the river would
continue to be coordinated by the Combined Technical
Commission for the Development of the Río Paraná.