A new program in Hawaii will use battery energy storage to help firm the grid after a coal plant is retired in September 2022.

Hawaiian Electric said this week that it is now accepting applications for Battery Bonus, a new program that will pay a cash incentive for residential and commercial customers on O‘ahu to add energy storage (a battery) to an existing or new rooftop solar system.

The incentive will help move Hawai‘i toward its goal of 100% clean energy by 2045 and add more renewable resources to the grid in the short-term when the AES coal-fired plant is retired in September 2022.

The program is capped by the Public Utilities Commission (PUC) at a total 50 megawatts (MW) supplied from storage among all participants. Incentive payments are:

$850 per kilowatt (kW) for those accepted for the first 15MW. (For example, 5kW would yield a $4,250 payment.) Hawaiian Electric will confirm by checking battery data that the system is meeting its committed performance in the program for the customer to receive the full amount of incentive.$750 per kW for those accepted for the next 15MW.$500 per kW for those accepted for the last 20MW.

Applications will be accepted through June 23, 2023, or until the cap is reached.

Homeowners and businesses with an existing solar system 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. Up to 5 kW of new panels may be added under existing programs. There is no limit on the size of an individual customer’s battery.

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

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