Sustainability Language

Life Cycle Assessment & Product Footprinting

Cumulative energy demand (CED)

An LCA indicator quantifying the total primary energy used across a product's entire life cycle, often used as a proxy for environmental burden.

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Definition

Cumulative energy demand is a life-cycle assessment indicator that sums all primary energy — renewable and non-renewable — extracted and consumed across a product system, from raw-material acquisition through production, use and end of life. Because energy use correlates with many other impacts, CED is frequently applied as a screening proxy for greenhouse gas emissions and broader environmental load, though no single harmonised accounting approach exists across methods.

References

Overview

What it means

A one-number energy footprint of a product's life cycle, exposing hidden upstream energy even where emissions data are incomplete.

How it is used

Practitioners report CED in LCA studies, product comparisons and environmental product declarations, and use it to identify energy hotspots in supply chains.

Why it matters

Energy demand underlies climate and resource depletion impacts; CED offers a transparent, physically grounded indicator that predates carbon-only footprinting.

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