The conventional wisdom is that an executive agency’s scope of action and power depends on how easy it is to reverse agency decisions in court. If non-deferential judges provide industry with prompt review of agency decisions, the agency’s power is limited. And if courts are unlikely to second-guess the agency’s interpretations, then private actors have little choice but to comply. But in recent years, agencies have begun to rely on a new weapon in this struggle with courts and industry — the power of proposed rules to achieve regulatory outcomes. When regulations will affect long-term capital investments, companies must set a course for compliance long before a proposed rule is finalized or could be challenged in court. Thus, agencies know...