Energy saving opportunities in industrial plant

Energy saving opportunities (energy conservation measures) are the changes in equipment, operation and maintenance that reduce energy use without reducing output.

1. Electrical supply system

• Improve power factor with capacitor banks (APFC) – reduces kVA demand, losses and penalties.
• Run transformers near optimum load; switch off lightly loaded transformers.
• Reduce maximum demand through load management and shifting to off-peak hours.
• Balance phase loads; correct voltage level; reduce harmonics with filters.
• Use proper cable sizes to reduce I²R losses.

2. Motors and drives

• Replace old or rewound motors with energy-efficient (IE3/IE4) motors.
• Avoid oversized, under-loaded motors; use star-delta switching for lightly loaded motors.
• Use variable frequency drives (VFDs) on fans, pumps and compressors instead of dampers/throttle valves.
• Use efficient belts (flat/cogged), proper alignment and lubrication.

3. Pumps, fans and blowers

• Correct sizing, trim impellers, avoid throttling; remove unnecessary bends; use VFD.

4. Compressed air system

• Fix air leaks (often 20–30% loss), reduce pressure setting, use intake air from cool place, switch off when not needed.

5. Lighting

• Replace incandescent/CFL/tube lights with LED; use daylight, occupancy sensors, timers, separate switching.

6. Thermal systems (boilers, furnaces)

• Control excess air, insulate pipes and furnaces, recover waste heat, return condensate, fix steam leaks and traps.

7. Refrigeration and HVAC

• Raise chiller set point, clean condensers, use efficient compressors and thermal insulation.

8. Process and management

• Avoid idle running, schedule production, monitor with energy meters, train staff, regular energy audits.

Opportunity        Typical saving
LED lighting       40–60 % of lighting energy
VFD on fan/pump    20–50 % of drive energy
Air leak repair    10–30 % of compressor energy
PF correction      lower kVA demand charge