energieindex

Energieindex is a numeric indicator used in building energy assessment to express the relative energy performance of a building. It is typically derived from modeled or measured energy use related to heating, cooling, hot water, ventilation, and lighting, and is often normalized per square meter per year. The exact definition and scale of the index vary by country and standard, but in general lower values indicate better efficiency.

Energieindex is commonly applied in energy performance certificates and energy labeling schemes. It serves as a tool for property owners, designers, and policymakers to compare buildings, identify opportunities for improvement, and track progress in reducing energy demand. In many systems, the index feeds into or complements a broader label or coefficient that communicates overall energy performance to the market or authorities.

Calculation approaches differ across regions. Some frameworks calculate the index from a modeled energy demand using standardized occupancy and climatic data, while others incorporate actual consumption data. Building characteristics such as insulation, airtightness, heating and cooling systems, heat pumps, and the integration of renewable energy influence the score. Operational factors, including user behavior and occupancy, can also affect the realized energy use, which may diverge from the calculated index.

Limitations include dependence on climate assumptions, occupancy patterns, and building usage, which can reduce comparability between different buildings or regions. As part of evolving energy policies, energieindex concepts aim to support upgrades, retrofit planning, and the transition toward more energy-efficient building stock.

See also: energy performance certificate, energy label, building energy modeling standards.