Hospital energy systems under transition: global consumption patterns, technology integration, and pathways toward fully renewable healthcare facilities

Hospitals and healthcare facilities are among the most energy-intensive and operationally demanding building types in the built environment. Their continuous 24/7 operation, coupled with the stringent requirements for a high-quality, uninterrupted power supply to power critical medical equipment, heating, ventilation, and air conditioning (HVAC) systems, lighting, and other essential infrastructure, presents a significant challenge for decarbonization and the integration of renewable energy systems. This article presents a comprehensive analysis of hospital energy consumption patterns worldwide and the specific nature of the healthcare sector's energy demands. A key contribution of this work is the structured analysis of the scientific literature in a field where research remains limited, particularly regarding renewable energy systems and emerging technologies in healthcare settings. The study examines the technological, operational, economic, and environmental factors influencing the adoption of renewable energy solutions in hospitals, integrating them with sector demand, energy storage, and resilience. Furthermore, it explores the concept of the “100% Renewable Hospital”: a fully sustainable healthcare facility designed to maximize the use of renewable energy sources and capable of maintaining critical operations during grid disturbances or outages through resilient and partially autonomous energy system configurations, thereby reducing dependence on the external power grid. The document analyzes the main engineering and economic challenges associated with achieving this level of autonomy and identifies key considerations, such as implementation constraints and system-level trade-offs, to support the development of technically feasible and economically viable solutions. It also proposes a structured, multi-layered framework for 100% renewable hospitals.