EnterpriseVal is a use-case-level evaluation system for generative AI (GenAI) in the enterprise. It addresses the issue of measuring GenAI efficacy, reliability, and value by providing a formal specification, metric catalogue, grading protocol, and decision-making framework. The system aims to help organizations make informed decisions about GenAI deployment and scaling. A pilot across three workflows in a global bank showed promising results, including high citation precision and reduced analyst refinement effort.