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Hawaii’s battery systems get paired with wind & solar power units

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Nearly all of Hawaii’s utility-scale energy storage is installed adjacent to onshore wind turbines or solar photovoltaic (PV) systems. Pairing…

Such hybrid power systems help reduce operational costs as they make the best possible use of Hawaii’s sun-soaked and windy weather, while storing excess energy for later. In addition, battery storage is used for peak shaving, frequency regulation, reducing curtailments, and ramping/spinning reserves.

Peak shaving — when storage is used to lower peaks in demand — is the second most common application for such systems on Hawaii. Shifting portions of electricity demand from peak hours to other times of day also reduces the need for higher-cost, seldom-used generation capacity to be dispatched, which helps reduce wholesale electricity prices.

Averting costly HFP peaking plants

Without battery storage, Hawaiian utilities would have to rely on fast-ramp fossil power sources to back up renewables. Traditionally utilities used petroleum-, heavy fuel oil (HFO)- and coal-fired peaking power units, despite their high emissions intensity. Energy storage is virtually emissions free, helping to lower Hawaii’s carbon footprint.

Batteries are characterized by two metrics: power capacity and energy capacity. Power capacity is the maximum instantaneous amount of power that can be produced on a continuous basis. Energy capacity is the total amount of energy that can be stored or discharged by the battery.


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