449 F.2d 1109 (D.C. Cir. 1971)
Calvert Cliffs' Coordinating Committee v. AEC is the foundational federal appellate decision that transformed the National Environmental Policy Act (NEPA) from a lofty statement of policy into a set of enforceable, action-forcing procedural duties binding on all federal agencies.
Whether the AEC's NEPA-implementing regulations unlawfully minimized and deferred environmental review—by treating environmental analysis as nonbinding staff work, by excluding or limiting environmental issues in adjudications, by relying on other agencies, and by postponing analysis until late in the licensing process—in contravention of NEPA's requirement that environmental factors be considered to the fullest extent possible at every significant decision stage.
NEPA requires all federal agencies, to the fullest extent possible, to integrate environmental values into their decisionmaking processes. For any major federal action significantly affecting the quality of the human environment, an agency must prepare a detailed environmental impact statement addressing (1) the environmental impact of the proposed action, (2) any adverse environmental effects that cannot be avoided, (3) alternatives to the proposed action (including the no-action alternative), (4) the relationship between short-term uses and long-term productivity, and (5) any irreversible and irretrievable commitments of resources. The EIS must be prepared and considered before irreversible commitments are made, must inform and be part of the decision record, and the agency itself must independently take a hard look at environmental consequences and alternatives. NEPA supplements an agency's organic statute and applies unless there is a clear and unavoidable statutory conflict; agencies may not avoid or dilute NEPA obligations by deferring analysis, delegating responsibility to other agencies, or restricting environmental issues in adjudications.
The D.C. Circuit invalidated the AEC's NEPA regulations to the extent they (1) deferred meaningful environmental consideration until late in the licensing process rather than at the construction permit stage; (2) treated environmental analysis as staff work insulated from the adjudicatory record; (3) limited consideration of environmental factors to issues not addressed by other agencies; and (4) restricted the presentation and examination of environmental issues in hearings. The court held that NEPA applies fully to AEC licensing and requires the Commission to incorporate environmental values and alternatives into each significant decision step, with an EIS prepared and considered before irretrievable commitments are made. The matter was remanded for the AEC to revise its rules and procedures consistent with NEPA.
Calvert Cliffs is the first major appellate decision to give NEPA real force. It established that NEPA's EIS and alternatives analysis are judicially enforceable duties, required early in the decision process and integrated into the record. The case crystallized the "hard look" approach to reviewing NEPA compliance, clarified that NEPA supplements all agencies' organic statutes (including independent commissions), and barred agencies from relying on other regulators or deferring analysis past the point of irreversible commitment. For law students, it is a cornerstone of administrative and environmental law, framing how courts police procedural regularity, transparency, and reasoned decisionmaking under NEPA.