DOE Launches New Grid-Connected Wave Power Project in Hawaii

Marine energy technologies are beginning to emerge but are a long way from being competitive

2 min read
DOE Launches New Grid-Connected Wave Power Project in Hawaii
Photo: Northwest Energy Innovations

The U.S. Department of Energy (DOE) has launched a new wave power device to bring renewable power to the island of Oahu in Hawaii.

Northwest Energy Innovation has developed a float that is attached to a hull under the water. The device captures both the vertical and horizontal motion of the wave, and the energy that is captured is the result of the relative rotation between the hull and the float. The energy is then transferred via a cable to land.

The device, named Azura, will be installed at the U.S. Navy’s Wave Energy Test Site in Kaneohe Bay. It will be independently tested by the University of Hawaii.

The 20-kilowatt demonstration project will run for one year. It is the first time a grid-connected, wave energy device has been deployed and independently tested for that period of time in the United States, according to the DOE.

Earlier this week, the DOE announced more than 90 teams for its Wave Energy Prize, a design-build-test competition to develop game changing wave energy conversion devices. The total prize will be worth about $2 million. The $2 million is part of about $26 million that the DOE has spent on developing wave and tidal energy projects in the past three years.   

Despite the DOE’s ongoing support of marine and hydrokinetic technologies, it’s been a slow, bumpy road without major success stories so far.

The lack of progress is not limited to America. There have been essentially no large-scale wave power facilities installed worldwide with the exception of one off the coast of Portugal, as IEEE Spectrum noted last fall. Even so, many countries, including the UK and China, continue to invest in different technologies with the hope for a breakthrough.

There is no shortage of designs to capture the ocean’s energy. In China, for example, a US $30 billion tidal wall is undergoing a feasibility study. In Hawaii, Makai Ocean Engineering is taking an entirely different approach.

The firm is building an ocean thermal energy conversion (OTEC) plant that leverages the difference between warm surface ocean water and colder, deep-sea water to heat and condense ammonia to drive a turbine. The first operational OTEC plant, however, could be off the shores of Martinique in the Caribbean.

The DOE claims that extracting just 5 percent of the ocean’s energy potential around the US could power 5 million homes. But finding technology that can meet even that small potential at a cost compared to conventional fossil fuel generation, or the falling cost of wind and solar, has been difficult.

When completed, for example, the plant off of Martinique would supply about 11 megawatts of energy, the equivalent of about two of the world’s largest offshore wind turbines or enough energy for 10,000 homes.

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Smokey the AI

Smart image analysis algorithms, fed by cameras carried by drones and ground vehicles, can help power companies prevent forest fires

7 min read
Smokey the AI

The 2021 Dixie Fire in northern California is suspected of being caused by Pacific Gas & Electric's equipment. The fire is the second-largest in California history.

Robyn Beck/AFP/Getty Images

The 2020 fire season in the United States was the worst in at least 70 years, with some 4 million hectares burned on the west coast alone. These West Coast fires killed at least 37 people, destroyed hundreds of structures, caused nearly US $20 billion in damage, and filled the air with smoke that threatened the health of millions of people. And this was on top of a 2018 fire season that burned more than 700,000 hectares of land in California, and a 2019-to-2020 wildfire season in Australia that torched nearly 18 million hectares.

While some of these fires started from human carelessness—or arson—far too many were sparked and spread by the electrical power infrastructure and power lines. The California Department of Forestry and Fire Protection (Cal Fire) calculates that nearly 100,000 burned hectares of those 2018 California fires were the fault of the electric power infrastructure, including the devastating Camp Fire, which wiped out most of the town of Paradise. And in July of this year, Pacific Gas & Electric indicated that blown fuses on one of its utility poles may have sparked the Dixie Fire, which burned nearly 400,000 hectares.

Until these recent disasters, most people, even those living in vulnerable areas, didn't give much thought to the fire risk from the electrical infrastructure. Power companies trim trees and inspect lines on a regular—if not particularly frequent—basis.

However, the frequency of these inspections has changed little over the years, even though climate change is causing drier and hotter weather conditions that lead up to more intense wildfires. In addition, many key electrical components are beyond their shelf lives, including insulators, transformers, arrestors, and splices that are more than 40 years old. Many transmission towers, most built for a 40-year lifespan, are entering their final decade.

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