The most current version of the data center energy standard is , which updated the 2019 edition. Key Updates and Focus Areas
As we navigate 2026, the demand for AI and high-performance computing (HPC) means higher rack densities (>30kW per rack). ashrae 904 pdf upd
The standard continues to set maximum allowable losses for power distribution (transformers, UPS, etc.). The 2022 update further refined how ELC is calculated, emphasizing high-efficiency equipment. C. Renewable Energy & Sustainability The most current version of the data center
The standard separates electrical efficiency into the Electrical Load Component (ELC) . The update tightens the requirements for UPS efficiency and transformer losses. The 2022 update further refined how ELC is
This pathway offers design flexibility. Instead of making every single component compliant, designers can look at the system holistically. Under the performance path, a data center can comply if the calculated annual energy use of the proposed design is equal to or less than the energy use of a baseline system built strictly to prescriptive limits. This allows engineers to trade off a slightly less efficient cooling component for a highly efficient electrical system, or vice versa. How to Access the Official ASHRAE 90.4 PDF