AES Hawaii Generation Plant

From SourceWatch
Jump to navigation Jump to search
Coalswarm badge.gif

This article is part of the Coal Issues portal on SourceWatch, a project of Global Energy Monitor and the Center for Media and Democracy. See here for help on adding material to CoalSwarm.

Hawaii Generation Plant, also known as the West Oahu plant, is a 203.0-megawatt (MW) coal-fired power station owned and operated by AES near Kapolei, Hawaii. It is the only coal-fired power station in Hawaii.


The undated satellite photo below shows the power station, located in the south-west corner of the Hawaiian island of Oahu.

Loading map...

Plant Data

  • Owner: AES Hawaii Inc.
  • Parent Company: AES
  • Plant Nameplate Capacity: 203.0 MW (Megawatts)
  • Units and In-Service Dates: Unit 1: 203.0 MW (1992)
  • Location: 91-086 Kaomi Loop, Kapolei, HI 96707
  • GPS Coordinates: 21.306111, -158.10805
  • Technology: Subcritical
  • Coal type: Sub-bituminous
  • Coal Consumption:
  • Coal Source:
  • Number of Employees:
  • Unit Retirements: Unit is scheduled for closure in September 2022

Emissions Data

  • 2006 CO2 Emissions: 1,624,335 tons
  • 2006 SO2 Emissions:
  • 2006 SO2 Emissions per MWh:
  • 2006 NOx Emissions:
  • 2005 Mercury Emissions:


The West Oahu plant has a year-round capacity of 180 megawatts, and supplies about 11 percent of Oahu’s commercial energy supply.[1]

AES Hawaii burns approximately 650,000 tons of subbituminous coal each year. The coal is imported from Indonesia via a marine terminal at the Barbers Point Harbor.[2]

In 2014 Hawaiian Electric told plant owner AES Hawaii to consider converting part or all of the power station from coal to biomass. According to Hawaiian Electric, energy payments made to AES Hawaii under the existing power purchase agreement with Hawaiian Electric, which expires in September 2022, may not fully cover the costs of coal as more variable renewables come online, requiring power generation with more operational manueverability.[1]

In January 2017 Hawaii regulators rejected a plan by Hawaiian Electric Co. and AES Hawaii to expand the plant, saying the proposal was at odds with the state’s renewable energy future.[3]

The following table gives more info on this plant's SO2 emissions levels, as well as on whatever SO2 emissions "scrubbers" (Flue Gas Desulfurization units, or FGDs) have been installed at the plant. Each of the plant's units is listed separately, and at the bottom overall data for the plant is listed.[4][5]

Unit # Year Built Capacity MWh Produced (2005) SO2 Emissions (2002) SO2 Emissions per MWh (approx.) Average Annual Coal Sulfur Content FGD Unit Type FGD In-Service Year FGD SO2 Removal Efficiency
Total 1992 203 MW 1,547,814 MWh 25,144 tons 32.49 lb./MWh 0.61% none installed

Articles and Resources


  1. 1.0 1.1 "Hawaii's Only Coal-fired Power Plant May Switch to Biomass," Pacific Business News, Aug 28, 2014.
  2. Clynton Namuo (June 18, 2004). Oahu coal plant generates energy without black smoke. Pacific Business News. Retrieved on 2009-01-02.
  3. "Hawaii regulators reject coal plant's expansion," Biz Journal, Jan 5, 2017
  4. Coal Power Plant Database, National Energy Technology Laboratory, U.S. Dept. of Energy, 2007.
  5. EIA-767, Energy Information Administration, 2005.

Related SourceWatch Articles

External Articles

This article is a stub. You can help by expanding it.