Who, What & Where

  • Company: Aquion Energy
  • Project Name: Providing 100% Renewable Power to Large Residence on Protected Kona Coast
  • Location: Kiholo Bay, Hawaii, USA
  • Year of completion: 2014

The Company

Aquion Energy is the manufacturer of proprietary Aqueous Hybrid Ion (AHI™) batteries and battery systems for long-duration stationary energy storage applications. Aquion’s Aspen line of batteries are optimized for daily deep cycling for residential solar, green architecture, off-grid and microgrid, energy management, and grid-scale applications. Aquion’s high-performance, safe, sustainable and cost-effective batteries deliver reliability and value for customers. The company’s battery systems provide flexible, modular energy storage that enables broad adoption of renewable energy technologies such as wind and solar, reduced reliance on fossil fuels, and optimization of existing grid-tied generation assets.

The Challenge

Bakken Hale, a private residential estate, is located along the environmentally sensitive Kona Coast. It cannot be connected to the grid and was powered by large propane generators.

Opportunities for Renewables

Owner wanted to reduce fossil fuel use and needed clean, reliable power to meet the load requirements.

Renewable Solution

The off-grid microgrid system was designed and installed by Renewable Energy Services, Inc. (RES), an experienced solar system installer in Hawaii. The microgrid uses a 176 kW solar array, 1 MWh Aquion AHI M-Line Battery Modules, and a propane-fueled generator used solely for emergency backup. The system is sized for three days of autonomy. The batteries will charge from the solar array during daylight hours, and discharge to provide nighttime power on a daily 8-hour charge/16-hour discharge cycle. Aquion battery systems are well suited for this type of long-duration, daily cycling charge/discharge profile.

Project Financing and Costs

Private; Earl Bakken, owner

Project Outcome

This solar microgrid provides a clean, sustainable energy system that meets the needs of an environmentally sensitive site. The system is designed to generate 350 MWh per year silently from the sun, with little to no maintenance. Over that time, the system will reduce carbon dioxide emissions by more than 5,000 metric tons. Bakken Hale is expected to reduce fossil fuel usage by 97%.