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Hensel Phelps has begun building two microgrids at Hawaii Department of Transportation (HDOT) base yards, pairing solar generation and battery storage with electric vehicle charging to support facility operations and the agency’s expanding electric fleet.
Each project will deliver a 1-megawatt microgrid. The installations at the Honolulu base yard on Oahu and the Lihue base yard on Kauai are part of a statewide effort to reduce fossil fuel dependence, expand transportation electrification and strengthen energy reliability.
Construction follows ground blessing ceremonies held on Nov. 7, 2026, with Sustainability Partners and state representatives.
The Honolulu installation will include 570 photovoltaic solar panels, each rated at 580 watts, along with 41 electric vehicle charging stations and large-scale battery energy storage. The system is intended to supply renewable electricity for facility operations while supporting HDOT’s growing electric vehicle fleet.
At the Lihue base yard, plans call for 290 photovoltaic solar panels, each rated at 580 watts, and eight electric vehicle charging stations. Battery energy storage will also support operational reliability at the Kauai facility.
Both base yards remain active HDOT locations, making energy resilience and continuity of transportation operations important considerations during project delivery.
Hensel Phelps is delivering the developments through a design-build arrangement under the statewide Sustainability Partners Program. Group 70, Stantec and Wasa Electrical Services are also on the project team, providing design and electrical construction capabilities.
The installations belong to a broader portfolio of energy and transportation electrification initiatives across Hawaii. By integrating solar generation, storage and fleet charging into existing transportation facilities, the projects support the state’s efforts to reduce greenhouse gas emissions and improve the reliability of essential transportation operations.
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