The Tamil Nadu Assembly unanimously passed a resolution on June 19, 2026, opposing Karnataka’s proposed Mekedatu dam project planned across the Cauvery River. The Assembly urged the central government not to approve or grant any clearance for the dam’s construction. This resolution has been a significant political move amidst rising tensions between the two states over water-sharing issues.

Chief Minister C Joseph Vijay, who introduced the resolution, underscored the collective duty to protect the state’s water resources. He stated that safeguarding water rights is critical, emphasising that “water is our basic right and resource.” Vijay committed to addressing this issue without shifting blame to other political parties.

The resolution strongly condemned Karnataka’s alleged unilateral approach towards constructing a balancing reservoir worth Rs 9,000 crore, arguing that it contravenes both the Cauvery Water Disputes Tribunal award and the subsequent Supreme Court ruling.

Political Rifts Within Congress

This matter has caused division within the Congress party itself. While Karnataka is under Congress governance, leaders from Tamil Nadu have openly supported the resolution brought forth by the ruling Dravida Munnetra Kazhagam (DMK) government. This discord illustrates the complexity of political alliances in the face of regional water disputes.

The resolution reiterated the stance of both the Cauvery Water Disputes Tribunal and the Supreme Court, which determined that the Cauvery basin is a deficit area. It maintained that existing water resources had already been allocated among the involved states, deeming the initiation of new projects in the basin unacceptable.

Moreover, the Assembly called for the central government to advise Karnataka against proceeding with the Mekedatu dam project and requested that the Central Water Commission refrain from processing Karnataka’s Detailed Project Report (DPR) related to the dam. This request reflects the Assembly’s commitment to protecting the interests of Tamil Nadu’s agricultural sector.

Rationale Behind Opposition to the Dam

During a recent address, Chief Minister Vijay emphasised the importance of unity among political factions for the welfare of farmers and residents, stating, “We may have differences in politics, but for the welfare of the people, we must all be united.” His remarks highlight the urgency of setting aside political differences in light of significant regional issues.

Karnataka’s government argues that the Mekedatu project aims to fulfil the growing water demands of Bengaluru and generate hydroelectric power. They insist that the project would not negatively impact Tamil Nadu’s share of water, framing it as an essential initiative for the state’s development.

The proposed project involves the construction of a reservoir at the confluence of the Cauvery and Arkavathi rivers in the Kanakapura region of Ramanagara district. The reservoir is intended to provide drinking water to Bengaluru while also generating 400 megawatts of renewable hydroelectric power.

In an effort to bolster Tamil Nadu’s position, Chief Minister Vijay previously addressed Prime Minister Narendra Modi, requesting that the DPR for the Mekedatu be rejected. This communication further signifies Tamil Nadu’s resolute opposition to any new storage projects on the Cauvery River without collective agreement from all downstream states.

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