Customer Renewable Programs

Battery Bonus

Cash Incentive to Add Energy Storage to an Existing or New Rooftop Solar System

Hawaiian Electric will pay a cash incentive and provide bill credits for customers on Oahu and Maui to add energy storage (a battery) to an existing or new rooftop solar system. These perks will help move Hawaii toward its goal of 100% clean energy by 2045 and add more renewable resources to the grid as Hawaiian Electric retires generators fired by fossil fuels.

The Public Utilities Commission has capped the program at a total of 40 megawatts (MW) supplied from storage on Oahu and 15 MW supplied from storage on Maui. All customers will receive $850 per kilowatt (kW).

Hawaiian Electric worked with the solar industry to add incentives and make other improvements to the program. Regulators approved the following amendments effective June 1, 2021.

  • Customers not in the company's Net Energy Metering Program will receive a fixed monthly bill credit for energy exported to the grid for three years. For Non-NEM customers, the credit is an amount equivalent to the respective retail rate for electricity exported during the two-hour period. The retail rates will be updated at the beginning of each calendar quarter. Any used portion of the credit will be zeroed out at the end of every year. The credit is not cashable.
  • Customers will receive a $5 per kW monthly peak capacity payment for the 10-year duration of the program. The payment is offered as a bill credit.

Committed capacity is the amount of kW discharged from the battery for two hours during the window of 6 – 8:30 p.m. The committed capacity determines the incentive. For example, a 15 kilowatt-hour (kWh) battery can commit 5 kW or 10 kWh over two hours, therefore, the incentive would be $850 x 5 kW= $4,250. If weather does not allow for sufficient battery charging there will be no penalty to the customer as long as the battery storage is paired with PV generation with a ratio of at least 1 kW of generation for every 2 kWh of committed capacity.

Customers who wish to participate with an existing solar system and are presently enrolled in a customer energy program (such as Net Energy Metering, Customer Grid Supply, or others) will continue to receive full benefits from these programs. A customer must install a battery of any size and may add new panels as long as the additional PV capacity is not more than twice the battery size. Existing customers are customers that have received Permission to Operate before July 1, 2021 on Oahu and before June 1, 2022 on Maui.

Tesla Power Wall Battery

The owner of the solar-plus-storage system will receive the incentive. To receive the incentive faster, the bill account holder should be the owner of the storage system. That can be the residential or commercial customer owning the system or a company that leases the system to the homeowner or business.

This incentive payment is considered income. Hawaiian Electric will provide participants with tax forms and report information to the IRS and Hawaii Department of Taxation. Hawaiian Electric cannot offer tax advice. Consult a tax preparer with concerns about individual circumstances. In some cases, federal tax credits may be available.


The total program term is 10 years. Customers who participate must use and/or export electricity stored in the battery at the committed amount on a firm two-hour schedule specified by Hawaiian Electric between 6 p.m. to 8:30 p.m. (for example, 6:15 p.m. to 8:15 p.m.) daily including weekends and holidays.

Once the battery is installed and operational, seven consecutive days of operational performance data will be collected to show how much the battery is discharging during the 2 hour peak period, verifying the incentive amount. Inverter information, permit, and other information is also required to approve the install as part of the validation process.

Tesla Power Batteries

Customers must work with a solar contractor to add storage to an existing solar system or install a new solar-plus-storage system. Hawaiian Electric cannot recommend a contractor or equipment. If customers do not have a contractor, Hawaiian Electric recommends comparing bids from at least three contractors.

The contractor will help fill out forms and submit them through Hawaiian Electric's on-line Customer Interconnection Tool. Securing a building permit with the appropriate county building department or proof of permit application is required as part of the application, and will determine the incentive amount.

Application Checklist:

  • Please use the account holder as your System Owner operator to decrease time to process incentive check.
  • Enrollment in approved Hawaiian Electric renewable energy rate program on Oahu and Maui: NEM/+, CGS/+, SE, CSS, SIA
    • Must install new battery (Replacement batteries are not eligible, and adding more storage is eligible if increasing battery kW, not kWh)
    • Must use battery two hours each day between 6 - 8:30 p.m. We provide exact start time.
  • Proof of permit application with county permitting office
  • On Maui, contractors may submit a completed Hawaiian Electric Grant of Authority form to the county permitting office to obtain a building permit number.
  • Submission of a Battery Bonus amendment in the Customer Interconnection Tool
  • Review the Battery Bonus Program Agreement (PDF)
  • Seven days of operational data, as required
  • Signed W9 (Owner Operator of battery, see amendment page 1. Must be one person on W9) Electronic signature is encouraged using DocuSign. W9 forms also can be printed out, signed and mailed to: Hawaiian Electric, P. O. Box 2750, Honolulu, HI 96840, Attn: AL18-SG
As of 7/1/23 Enrolled MWs1
Oahu 26.5 MW
Maui 3.9 MW
  1. If a start time is not provided within an email sent by Company with subject “Project ID P-AMD-22-xxxxxx: Your application has passed completeness review" or "Your AMEND system has been conditionally approved", please use start time = 6:07pm for Oahu and 6:06pm for Maui.

Frequently Asked Questions

What is the Battery Bonus program?

Battery Bonus is a new initiative in Hawaii that provides monthly and one-time incentives to residential and commercial customers on Oahu and Maui. These incentives are given to encourage customers to add energy storage to their existing or new rooftop solar systems. By doing so, it helps Hawaii move closer to its goal of using 100% clean energy for electricity by 2045 and supports the shift from fossil fuels to renewable-based generation. The program's rules can be found in Rule 31.

How can I determine if the Battery Bonus program is suitable for me?

Several factors should be taken into account when considering this program. If your main goal is to lower your current electricity bill, you should evaluate how long it will take for the savings from the added generating capacity and/or battery to cover the installation costs. However, if your motivation is to contribute to cleaner energy and reduce dependence on fossil fuels, the program's intrinsic value becomes more important.

What are the incentives for the Battery Bonus program?

There are three types of incentives in the Battery Bonus program:

  1. One-time check: You will receive $850 per kilowatt (kW) on Oahu and Maui. For example, if you commit 5 kW, you'll get a $4,250 bonus. The payment will be made after your project is installed and operational, and contracts are signed. The incentive check will be sent within 30 days from the date of the contract execution email. The program is capped at 15 MW for Maui and 40 MW for Oahu. The one-time incentive check will be reduced by any outstanding charges on your electric bill.
  2. Monthly capacity bill credit: You will get $5 per kW per month of committed capacity. This credit will reduce your minimum bill cost and lasts for 10 years from the enrollment start date (the execution of the contract), shown as execution of contract date on the Scheduled Dispatch Program (SDP) agreement. This monthly bill credit started in June 2022 for all participants and is not retroactive for energy storage systems in place before that date.
  3. Monthly energy bill credit for non-Net Energy Metering (NEM) program customers. Monthly export credit for non-Net Energy Metering (NEM) customers is calculated as follows:

    Credit = [(Sum of non-fuel energy charges and all per-kWh charges, using rates at the beginning of each calendar quarter) - (Non-NEM, Distributed Energy Resources (DER) tariff export rate per kWh)] x Committed Capacity (kW) x 70% x 2 hours x 30 days.

This fixed credit expires after three years from the enrollment start date. This credit started in July 2022 and is not retroactive for energy storage systems in place before that date. Any used portion of the credit will be zeroed out at the end of every year. The credit is not cashable.

Example for 5kW Committed Capacity Incentives:

  1. One-time check: If you commit to a 5kW capacity, you will receive a one-time payment of $4,250. The amount is calculated as $850/kW * 5 kW = $4,250.
  2. Monthly capacity bill credit: You will get a monthly credit of $25 ($5 per kW) for your committed 5 kW capacity.
  3. Non-NEM customers only: For non-Net Energy Metering customers, you will receive an additional credit of about $46.20 per month. The credit is calculated as ($0.32 - $0.10)/kWh x 5 kW x 70% x 2 hours x 30 days Please note that the specific rates used in this example are approximate and may vary.

Remember, these incentives are added to any credits you already receive from being on your respective Distributed Energy Resources (DER) program.

What do I need to receive the incentive?

To receive the incentive, you need to meet the following criteria:

  1. Be enrolled in an approved Hawaiian Electric renewable energy rate program on Oahu and Maui (NEM/+, CGS/+, SE, CSS, SIA). (Note: Feed-in Tariff does not qualify).
  2. Install a new battery for your solar system.
  3. Use the battery for at least two hours every day between 6 p.m. and 8:30 p.m. The exact start time will be provided by Hawaiian Electric.
  4. Provide proof of permit application from the county permitting office.
  5. On Maui, submit a completed Hawaiian Electric Grant of Authority form to the county permitting office to obtain a building permit number.
  6. Submit a Battery Bonus amendment in the Customer Interconnection Tool.
  7. Provide seven days of operational data, as required. Follow the instructions in the Handbook for delivering verification data and use the provided Excel file to submit the data.
  8. Complete an IRS W-9 Form for Owner Operator. This is required before the issuance of the incentive check. Electronic signature is encouraged using DocuSign. W-9 forms can also be printed out, signed, and mailed to: Hawaiian Electric, P. O. Box 2750, Honolulu, HI 96840, Attn: AL18-SG.

What is the required amount of power (kW) to be delivered during an event?

When filling out the amendment form, you need to specify the "committed capacity." This means you must consistently deliver that specified amount every day for a duration of 10 years within the assigned two-hour block. You will receive an incentive payment based on the committed capacity you have specified. For example, if you have a 13.5 kWh battery and commit to delivering 5 kW for two hours (equivalent to 10 kWh), you will only receive an incentive payment for the 5 kW you have committed.

How do I determine my program commitment level?

You can work with your contractor to determine the capacity level (measured in kW) that you want to commit to maintaining the discharge level from your battery storage system. This commitment ensures that you can use the battery system for two consecutive hours every day. The specific dispatch period will be provided by Hawaiian Electric when you enroll in the program, and they may inform you in advance if there are any changes to the dispatch period.

How do I know if I am eligible?

You are eligible for the Battery Bonus program if you are a new or existing residential or commercial customer with rooftop solar and a battery storage system charged from on-site solar generation. This applies to customers enrolled in Hawaiian Electric's NEM, CSS, CGS, CGS+, SE, or SIA programs. Please note that projects with equipment installed prior to July 1, 2021, on Oahu and June 1, 2022, on Maui are not eligible. If your application is pending, you can submit the amendment to, indicate that the application is pending, and describe how the battery will provide added committed capacity.

How do I sign up?

To sign up, collaborate with your contractor and submit an application. The application should include evidence of a submitted building permit, which is necessary to determine and secure your incentive payment. After your system is installed and operational, the payment will be made. You can submit your applications through the Customer Interconnection Tool on the Hawaiian Electric website. If you are an existing or new Standard Interconnection Agreement customer who wants to apply for the Battery Bonus program, please email the required forms to

Can I add a battery to my existing solar system to participate?

Yes, you can

Can I participate by adding more solar panels to my system?

No, to participate, you must include a new eligible battery system.

Application Period

On Oahu applications will be accepted until Feb. 29, 2024, or until the 40MW cap is reached. Maui applications will be accepted through June 30, 2024 or until the 15 MW cap is reached. If the storage system's contracted capacity or export amount changes, it must be corrected within 30 days from notification or a $100 per month charge will appear on the customer's bill.


Customers may end participation before the 10-year commitment with a 60-day written notice to Hawaiian Electric and must repay a prorated portion of the incentive. Please fill out the Notice of Termination form and submit to to terminate contract.