AES Hawaii Generation Plant

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Hawaii Generation Plant, also known as the West Oahu plant, is a 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 in Oahu.

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

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.[2]

Plant Data

  • Owner: AES Hawaii Inc.
  • Parent Company: AES
  • Plant Nameplate Capacity: 203 MW
  • Units and In-Service Dates: 203 MW (1992)
  • Location: 91-086 Kaomi Loop, Kapolei, HI 96707
  • GPS Coordinates: 21.306111, -158.10805
  • Coal Consumption:
  • Coal Source:
  • Number of Employees:

Emissions Data

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

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.[3][4]

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. "Hawaii regulators reject coal plant's expansion," Biz Journal, Jan 5, 2017
  3. Coal Power Plant Database, National Energy Technology Laboratory, U.S. Dept. of Energy, 2007.
  4. EIA-767, Energy Information Administration, 2005.

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