There’s a lot of talk about making Hawaii “energy independent” by kicking our imported oil habit. State government has set a deadline of 2020 for utilities to
generate at least 20 percent of their power from sources other than oil. But what could we use to power our grid? Here, we explore the alternative energy sources now being pursued in the Islands.
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The state has a number of hydroelectric plants—generation units that are turned by the power of falling water. In terms of new construction, the main hydro discussion is its potential as what’s called “pumped storage.” This is a way of extending the working usefulness of intermittent power sources.
With wind, for instance, you could use the power to pump water into a high-elevation reservoir when the propellers are turning, and then run that water back down into a hydroelectric plant to produce energy when the wind isn’t blowing.
There probably isn’t room for enough upland reservoirs to effectively move windmills from the intermittent power to the firm power category, but the technique could certainly extend their usefulness.
The ocean itself is a vast reservoir of energy. One technology takes advantage of the physical movement of water—the motion of waves can be harnessed to power generators directly. One wave-energy plant is being tested off Kaneohe, and another is planned off Maui by a firm called Oceanlinx
There also seems to be potential for making power from the difference in temperatures between surface and deep water off Hawaii. Most of the world’s Ocean Thermal Energy Conversion (OTEC) testing has been done in pilot projects off the Big Island, but while Hawaiian Electric lists it as a potential energy source, there is still no active commercial Hawaii project and, indeed, no large-scale OTEC facility anywhere in the world.
The Hawaii-based firm OCEES
, for Ocean Engineering and Energy Systems, has a tentative agreement with the Navy to buy the power from a 13-megawatt OTEC plant to be installed off the tiny island of Diego Garcia in the Indian Ocean.
“Once you prove the first system works, we believe a lot of folks will adopt it, but it’s not easy to get the first one done. I would expect that we would have a system with 20 to 50 megawatts operational in Hawaii by 2020,” said OCEES president Harry Jackson.
Alternative energy advocate Henry Curtis, executive director of Life of the Land, said he believes OTEC could ultimately produce 40 percent to 50 percent of the state’s power—replacing oil as the primary electrical supplier.
Renewable power in Hawaii
Sources: Hawaiian Electric Co., Kauai Island Utility Co-op, government agencies and power providers.
Some existing major alternative energy production:
|Gay & Robinson |
bagasse and hydro 4.2 megawatts
HC&S sugar plant (Maui)
bagasse and hydro 12 megawatts
windfarm 30 megawatts
geothermal plant 30 megawatts
|Hawi Renewable |
wind farm 10.6 megawatts
Pakini Nui windfarm, South Point (Hawaii)
Lalamilo wind farm, Hawaiian Electric Light Co., (Hawaii)
|Waiau and Puueo run-of-the-river hydros, Hawaiian Electric Light Co., (Hawaii) |
Wailuku River run-
of-the-river hydro, Hawaiian Electric Light Co., (Hawaii)
Various private and commercial photovoltaic statewide,
approx. 2 megawatts total
Some projects under construction or near-term:
|* 34 megawatts of solar photovoltaic arrays at 12 state Department of Transportation locations, statewide, January 2010.|
* Auwahi Wind Farm, Shell Renewables and
Ulupalakua Ranch (Maui), 20 megawatts, 2011
|* Hawaiian Electric biodiesel-fueled plant, Campbell Industrial Park (Oahu) 110 megawatts, 2009|
* Conversion of Maui Electric diesel generators to biodiesel, 170-plus megawatts, 2009-2012
*Green Energy Team power plant (wood chips as fuel) (Kauai)
6.4 megawatts, December 2008
|* Castle & Cooke awaiting permits for 1.5 megawatt|
solar photovoltaic plant on Lanai
*UPC Hawaii Wind
Partners is planning
expansion of Maui’s Kaheawa wind farm by 21 megawatts, end 2009; wind farm at Kahuku, Oahu, 30 megawatts 2009; wind farm at Moloaa, Kauai, 12.5 megawatts 2010
Planned longer-term or in preliminary discussion
|* James Campbell Co. and Hoku Solar plan for 1.5 megawatts photovoltaic power at Kapolei Sustainable Energy Park (Oahu)|
* UPC Hawaii Wind Partners working on an approximately 300-megawatt windfarm on Molokai, power to be carried by undersea cable to Oahu
* Castle & Cooke, windfarm, approximately 300 megawatts on Lanai, power to be carried by undersea cable to Oahu
* Puna Geothermal Venture (Hawaii) haspermits for additional 30 megawatts.
|* Mass burn garbage-to-|
energy plant in Hilo (Hawaii), 5.4 megawatts
* Tradewinds biomass-to-energy plant at veneer mill in Hamakua (Hawaii), 3.6 megawatts
* Oceanlinx Wave Energy Project (Maui), 1.5 megawatts
* Kauai County landfill gas plant, .8 to 1.6 megawatts
* Hawaii Natural Energy Laboratory concentrated solar thermal project (Hawaii), 1 megawatt
|* Kauai Island Utility Co-op, a multi-fuel (biofuel possible) plant.|
* Expansion of Oahu’s HPOWER plant or construction of a second waste-to-energy facility
* Hawaiian Electric discussing possible Ocean Thermal Energy Conversion facility off leeward Oahu, 20 to 50 installed megawatts by 2020.
Sources: Hawaiian Electric Co., Kauai Island Utility Co-op, various government agencies and power providers.
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