Energy & Sustainability worked example

Motor Efficiency Savings at 99% savings persistence rate: a worked example

This scenario runs the motor efficiency savings calculation on the strong side: 99% savings persistence rate, with every other input held at its documented default. an energy or maintenance manager needs to value a motor or drive efficiency measure

The inputs for this scenario

  • Annual electricity avoided: 185,000 kWh (unchanged)
  • Electricity value: 0.12 $ / kWh (unchanged)
  • Savings persistence rate: 99 % (raised for this scenario; the documented default is 92)
  • Project implementation cost: 8,500 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Captured motor energy savings = annual electricity avoided × electricity value × savings persistence rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 30,112 $ for net motor efficiency savings, the number this scenario is built around.
  • At this operating point the engine returns 0.16 $ / kWh for savings per avoided kwh.
  • At this operating point the engine returns 21,612 $ for captured motor energy savings.
  • At this operating point the engine returns 8,500 $ for project implementation cost.

How this compares with the baseline

  • Against the tool's baseline example, where savings persistence rate sits at 92% and the headline result is 28,584 $, this scenario comes in 5.35% above the baseline at 30,112 $.
  • Use it when building the business case for a premium-motor or VFD project, or when reconciling claimed savings against a utility incentive. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Net motor efficiency savings: 30,112 $ (headline result)
  • Savings per avoided kWh: 0.16 $ / kWh
  • Captured motor energy savings: 21,612 $
  • Project implementation cost: 8,500 $

Run it with your numbers

  • Every input above is editable in the live Motor Efficiency Savings calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.