The Corpus Christi hydropower project has returned to Misiones' political and energy agenda three decades after residents rejected new dams on the Paraná River. The initiative would be binational between Argentina and Paraguay, and its Pindo-í option proposes a run-of-river plant of about 2,800 megawatts.
The democratic precedent constrains any further move. In the binding referendum of April 14, 1996, 299,420 people voted and 88.63% of valid ballots opposed the project; the provincial legislature then enacted a rule banning new dams on the Paraná within Misiones. Even project supporters acknowledge that a political decision would require a new public consultation.
The Argentine-Paraguayan Joint Commission for the Paraná River says the Pindo-í site, upstream from Corpus Christi, would flood less land than earlier alternatives. Its representatives estimate investment at between $4.2 billion and $5 billion and cite output several times greater than provincial demand, improved grid stability and potential royalties of about $50 million a year for Misiones.
Those figures are proponents' projections, not results from an approved project. The scheme remains at the pre-feasibility stage, has no secured financing and would rely on private capital under a binational concession. Argentina and Paraguay have not made a formal decision authorizing construction.
The main gap concerns current environmental information. In response to an access-to-information request, Misiones' Ministry of Ecology confirmed that no environmental impact assessment for Corpus-Pindo-í had been filed and that there was no technical ruling, public hearing or environmental declaration. Historical hydrological, biological and social studies can provide background, but they cannot replace the legally required assessment of an updated design.
Experts and organizations identify possible risks to wetlands, biodiversity, erosion, water quality and Paraná River dynamics, along with social and territorial effects that must be measured before any vote. The discussion need not automatically pit energy against the environment: it requires public, independent and binational data to compare benefits, alternatives and cumulative costs, particularly in the Atlantic Forest and a river already transformed by large dams.
The next real steps are not construction but a political decision on whether to formulate a new proposal, a complete environmental and social assessment, review by both countries and informed public participation. Without that sequence, claims of “minimal impact” cannot be verified and no legitimate decision can be built around infrastructure of this scale.
