Tunnel Boring & Heavy Civil Equipment worked example

Hydraulic Power Load with hydraulic power load connected load of 30 kW: a worked example

What does the result look like when hydraulic power load connected load reaches 30 kW? The full calculation is worked below with real intermediate numbers. Use it when hydraulic power load in tunnel boring and heavy civil equipment is up for an upgrade and you want a defensible savings story.

The inputs for this scenario

  • Hydraulic power load connected load: 30 kW (raised for this scenario; the documented default is 12)
  • Hydraulic power load runtime: 8 hr (unchanged)
  • Blended electricity rate: 0.12 $ / kWh (unchanged)
  • Units processed during runtime: 1,000 units (unchanged)

Working through the calculation

  • Applying the documented formula (Total hydraulic power load energy cost = hydraulic power load connected load × hydraulic power load runtime × blended electricity rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 240 kWh for hydraulic power load energy used, the number this scenario is built around.
  • At this operating point the engine returns 28.8 $ for total hydraulic power load energy cost.
  • At this operating point the engine returns 0.03 $ / piece for energy cost per kwh.
  • At this operating point the engine returns 3.6 $ / hr for hourly hydraulic power load energy cost.

How this compares with the baseline

  • Against the tool's baseline example, where hydraulic power load connected load sits at 12 kW and the headline result is 96 kWh, this scenario comes in 150% above the baseline at 240 kWh.
  • A figure at this level is achievable when hydraulic power load connected load is genuinely sustained, not just peaked for a shift. It uses a single connected-load figure, so it ignores duty cycle and load variation; a pump that idles between strokes draws far less than its rated kW, which can overstate energy if you enter the nameplate rather than the average drawn load.

Results at a glance

  • Hydraulic power load energy used: 240 kWh (headline result)
  • Total hydraulic power load energy cost: 28.8 $
  • Energy cost per kWh: 0.03 $ / piece
  • Hourly hydraulic power load energy cost: 3.6 $ / hr

Run it with your numbers

  • Every input above is editable in the live Hydraulic Power Load calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.