In the case of United States ex rel. Tennessee Valley Authority v. Powelson, 1942, the Supreme Court ruled in favor of the Tennessee Valley Authority (TVA). The TVA had been authorized by Congress to acquire land for a dam and reservoir project through condemnation proceedings if necessary. Southern States Power Company contested this action, arguing that their property was being taken without just compensation as required by the Fifth Amendment's Takings Clause. However, they also argued that because some of their assets were located outside of the area directly impacted by construction but would be affected indirectly due to loss in value or useability, these should be considered during compensation calculations too. The court disagreed with Southern States Power Company’s argument about indirect damages needing consideration when calculating fair market value for condemned properties under eminent domain laws. It held that only direct physical takings need to be compensated under federal law and not consequential losses from such actions like diminution in value or lost profits from remaining properties after partial taking has occurred.

In the dissenting opinion for United States ex rel. Tennessee Valley Authority v. Powelson, Justice Frank Murphy argued that the majority's decision was a departure from established principles of eminent domain law and could potentially lead to unfair results for property owners. He contended that when determining just compensation in condemnation proceedings, it is essential to consider all factors affecting value including potential future uses of the land being taken. The majority’s ruling disregarded this principle by refusing to take into account Southern States Power Company's plans for developing hydroelectric power on its properties which significantly increased their market value prior to condemnation by TVA (Tennessee Valley Authority). This approach, according to Justice Murphy, failed to provide full indemnity as required under Fifth Amendment and would discourage private investment in similar projects due fear of inadequate compensation if condemned later by government entities like TVA.