Project Overview

Kapolei Energy Storage (KES) is a 185 MW / 565 MWh state-of-the-art battery energy storage system that provides clean, firm capacity to the Hawaiian Electric Company. The 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.