for residents We help make your home and wallet
a little greener.

Save Up to $80 on Tier 2 Power Strips

Automatically turn off unused equipment and save.

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for Businesses Let’s make your business more efficient
and boost your bottom line.

Got A Project? We Can Help.

Search rebates and special offers by business type.

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Additional Resources

Want to learn more about this offer? Check out our FREQUENTLY ASKED QUESTIONS about Hawaii Energy's Water and Wastewater Solutions Program. 

Here are some other ways you can learn about energy efficiency and conservation at water & wastewater facilities:


Other Web Resources:

Tips for Water & Wastewater Treatment Facilities

Aeration Systems

  • Monitor for even air delivery to aeration tanks and the distribution within the tank.  Repair systems immediately if needed.
  • Review your aeration tanks to assess if one can be idled.
  • Install variable speed drives to operate the blower at an appropriate speed.  
  • Consider upgrading to a high-speed turbo blower for maximum efficiency.
  • Check the sheave sizes on the motor and blower to identify the speed of the unit to identify if the speed can be reduced.
  • Check discharge pressure of your blower to assess if the diffusers are dirty or a valve is partially closed.


  • Check if any valves are closed or throttled on the discharge.  Obtain kW readings and flow measurements on pump motor to identify its efficiency.
  • Obtain power bills to check if there have been any noticeable changes.
  • Note if any pumps are exhibiting excessive vibration during operation.
  • Identify the pump you have had the most problems with and assess if a change in pump selection would resolve the problem, generally most pumps are oversized for their application.
  • Review the load factor and length of time a pump is operating to assess if a smaller pump would help or a variable speed drive.
  • Check that all appurtenances in the force main are properly working (such as a pressure release valve is functioning and not air binding the pump).


  • Turn lights off when you leave an area and use natural lighting whenever possible.  
  • Use timers and occupancy sensors and keep them properly set (e.g.  no outside lights during the day).
  • Replace existing lights with newer, more energy-efficient LEDs, CFLs or T-8 lamps.
  • Utilize day lighting in building renovations.
  • Shade windows that are receiving direct sun.  


  • Make sure all exterior walls, ceilings and wall cavities are properly insulated.  
  • Keep doors and windows closed when running your air conditioning system.
  • Consider applying ENERGY STAR® “cool roof” material to your roof.
  • Install an Energy Management System (EMS) to control cooling systems.  
  • Choose ENERGY STAR® equipment when replacing cooling systems.

Ways To Save

We’ve put together a list of incentives* designed specifically for water and wastewater facilities. Custom rebates and technical assistance are also available for technologies or projects not listed on our forms.

*Incentives are available to all commercial electric utility ratepayers of Hawaii, Honolulu and Maui counties. They are available on a first-come, first-served basis and are subject to availability of funds, restrictions, and subject to change and/or discontinuation without advance notice.

Pumps and Motors

Start planning for a newer, improved and more energy-efficient system. Potential improvements include installing variable frequency drives (VFDs) on motors, replacing pumps and motors with newer, high-efficiency models, and installing energy-efficient lighting at pump stations.


Lighting is one of the simplest and most effective ways to reduce energy use and should be one of the first areas assessed for potential projects. Consider upgrading to new, more efficient lamps in interior and exterior applications. You can also maximize your savings by installing occupancy sensors that turn off lights in seldom-trafficked areas.

Heating, Ventilation & Air Conditioning (HVAC)

HVAC can make up as much as one-third of the energy consumed in a typical building. Consider variable frequency drives for fans or an inverter variable refrigerant flow (IVRF) air conditioning system. Hawaii Energy’s incentives can help offset costs and help you make investments that reduce your energy consumption and lower your energy bills.

Custom Projects

Do you have any other ideas? If a measure at your facility can contribute to energy savings but isn't listed here, you may qualify for additional custom incentives. Examples include: air compressors, process controls, high-speed blowers and grit removal. Contact Keith Block at  or (808) 839-8880 as you begin the planning process so we can ensure you get the maximum incentives available.