Project Overview

Plus Power has brought online a 185 MW / 565 MWh state-of-the-art battery energy storage system that provides clean, firm capacity to the Hawaiian Electric Company. The Kapolei Energy Storage (“KES”) project is located on approximately eight acres of land zoned for industrial use (I-2: Intensive Industrial).

KES interconnects to the Hawaiian Electric grid at the existing CEIP 138kV substation located approximately 2,500 feet east of the project site. The project received a Conditional Use Permit – Minor from the City & County of Honolulu’s Department of Planning and Permitting. 

The project was approved by the Hawai’i Public Utilities Commission in May 2021 and is now online. KES is part of a portfolio of projects that support the September 1, 2022 retirement of the AES coal plant. KES will operate as an emission-less, carbon-free facility that provides power and stability to the Hawaiian Electric grid on Oahu.