"The project is against the federal spirit of the country as three states like Odisha, Chhattishgarh and Telangana are opposed to it," SP state president Rabi Behera.
Behera said though cases had been filed in the Supreme Court, the NDA government passed the Bill in Lok Sabha without waiting for its verdict.
Behera said unless the height of the proposed Polavaram dam was reduced, a large number of people would be homeless in Malkangiri district.
SP workers demonstrated holding the NDA government responsible for passing a Bill in Lok Sabha paving the way for construction of the project.