How much electricity does a CNC turret punch save over a conventional punch in a Bangalore machine tools unit?

Per tonne, a lot; on the bill, little. BEE's SAMEEEKSHA project report for the Bangalore machine tools cluster cuts specific energy from 975 to 575 kWh per tonne with a CNC turret punch, while output rises from 130.5 to 228.375 t a year. Total power use barely moves; the gain is more tonnes for the same kWh.

What the report assumes

• Conventional turret punch: 975 kWh per tonne, 130.5 t a year.
• CNC turret punch: 575 kWh per tonne, with output 1.75 times higher, 228.375 t a year.
• Saving counted: 400 kWh per tonne on 228.375 t; the report puts the CO2 cut at 68.51 t a year.
• The machine punches 6 mm mild steel or 4 mm stainless, on sheets up to 1,270 x 3,000 mm, without re-tooling.

The cluster

About 100 machine tool units in Bangalore, making from 1.5 t to 1,050 t a year. BEE audited 30 of them, 10 in detail. Grid electricity is their main energy.

What to tell a buyer

Report the change as kWh and CO2 per tonne, not as a cut in total emissions. Your total can stay flat or rise with output while each part gets cleaner, which is what a buyer's product footprint uses.

Worked from the report's figures

• Before: 975 kWh x 130.5 t = 127,238 kWh a year
• After: 575 kWh x 228.375 t = 131,316 kWh a year, slightly more in total
• Counted saving: 400 x 228.375 = 91,350 kWh; at 0.675 kg/kWh (CEA, FY 2025-26) = 61.7 t CO2
• The report's 68.51 t implies about 0.75 kg/kWh, an older grid factor
• Per tonne: 975 x 0.675 = 658 kg CO2 before, 575 x 0.675 = 388 kg after

What Senseible does here

Senseible reads your monthly electricity bills at 0.675 kg CO2 per kWh for FY 2025-26; add your despatched tonnes and the per-tonne figure before and after a new machine follows from your own records.

• Your MSME carbon number
• Bangalore machine tool units: power saving
• CNC lathe replacing conventional lathes

Sources: BEE SME programme (SAMEEEKSHA), Detailed project report: CNC turret punch, Bangalore machine tools cluster, CEA CO2 Baseline Database User Guide, version 22.0

Last reviewed 2026-11-03.