Which of the following is commonly used as a KPI in sustainability performance in manufacturing?

• A. Water use
• B. Production lead time
• C. Energy intensity per unit
• D. Inventory turnover

Answer: (C)

Measuring energy intensity per unit keeps the focus on how efficiently a plant uses energy to produce each unit of product. This KPI directly ties environmental impact to actual production output, so improvements show up as lower energy use per unit, which often goes hand in hand with lower emissions, cost savings, and better overall resource efficiency. Because energy is usually a major part of a manufacturing footprint, tracking energy per unit provides a clear, comparable way to benchmark performance across lines, shifts, or sites and to monitor progress over time.

Water use is a sustainability concern, but it’s not as universally adopted as a standard KPI across manufacturing as energy intensity per unit, since water risk and usage vary greatly by industry. Production lead time measures speed and throughput, not environmental impact, so it’s more about operational efficiency. Inventory turnover focuses on stock levels and costs rather than environmental performance.