No cost options
Reduce motor idle time by identifying motors that are running but not in production.
If your plan allows, run effluent pumps at night to take advantage of off-peak rates.
Options to invest in
Regularly maintain your mechanical equipment — ensure belts and chains are tensioned correctly, and keep filters clean.
Investigate changing the drive type and gear ratios to reduce energy use.
Install control systems and variable speed drives to increase efficiency.