1. Case A: Small shop (3 machines)
Key levers
- Auto‑stop in standby / strict use of eco modes
- Inverters for coolant/air (match actual flow)
- Use off‑peak tariffs and optimize setups
Numbers (example)
| Item | Before | After | Delta |
|---|---|---|---|
| Standby power | 2.5 kW | 1.5 kW | −40% |
| Avg. while cutting | 10.0 kW | 9.0 kW | −10% |
| Monthly bill | ¥220,000 | ¥180,000 | −¥40,000 |
Results vary by conditions. Use measurements for accurate estimates.
Interpreting effects
Bill
−18%
CO₂
~1.2 t‑CO₂/year
Payback
~within 2 years
Just tackling “standby” and “auxiliaries” can yield tens of thousands of JPY per month. First capture what you can with operations, then prepare for renewals.
2. Case B: Large production line
Key levers
- High‑efficiency spindles and regeneration
- Integrated control of auxiliaries (centralized auto‑stop)
- Demand monitoring to level peaks
Numbers (example)
| Item | Before | After | Delta |
|---|---|---|---|
| Line average kW | 120 | 102 | −15% |
| Annual bill | ¥40,000,000 | ¥34,000,000 | −¥6,000,000 |
| CO₂ (annual) | — | ~7.5 t reduction | — |
The point is to shave the “peaks” by optimizing concurrency.
Interpreting effects
Bill
−15%
CO₂
~7.5 t‑CO₂/year
Payback
~1–3 years
Design to avoid simultaneous peaks at a line level. When auxiliaries/spindles/transfer are controlled together, stability improves further.
3. Execution flow (fastest path)
- Baseline: Measure for at least a week (panel / on‑machine / IoT power meters).
- Hypotheses: Identify peaks in standby, auxiliaries, and concurrency.
- Quick wins: Auto‑stop in standby, inverter retrofits, off‑peak utilization.
- Standardize: Rules, standard work, and check sheets.
- Renewal plan: Phase in high‑efficiency machines and control upgrades.
4. Required documents (examples)
- Equipment specs (catalog excerpts: required power / spindle / feed)
- Power measurements (screenshots with date/time and profile)
- Operational procedures (standby control, setups, off‑peak ops)
- Quotations (cost‑effectiveness for retrofit/renewal)
5. How to avoid pitfalls
Common pitfalls
- Judging only by kVA, misreading average kW
- Treating the 30‑min rating as if continuous
- Leaving auxiliaries ON all the time
Countermeasures
- Convert via PF × utilization realistically
- Use the continuous rating for evaluation
- Start with inverters & auto‑stop—“operations first”
6. FAQ
Q. We only have a few machines—will this work?
Yes. Reviewing standby and auxiliaries alone can have impact. Start with a one‑week measurement.
Q. Can we use subsidies?
Programs vary by time/region. We’ll shortlist matching programs and help with documentation.
Q. Where do we start?
Auto‑stop in standby, inverter retrofits, and optimizing concurrency are the fastest route.