The dream of hydrogen fuel cell cars has just been put back in the garage. U.S. Energy Secretary Steven Chu announced yesterday that his department is cutting all funding for hydrogen car research, saying that it won’t be a feasible technology anytime soon. “We asked ourselves, ‘Is it likely in the next 10 or 15, 20 years that we will covert to a hydrogen car economy?’ The answer, we felt, was ‘no,’” Chu said [CNET]. While innovative new cars are a high priority, Chu declared that his department will focus on efforts that may pay off sooner, like plug-in electric cars.
Cars powered by hydrogen fuel cells have been a staple of clean energy dreams, as they’d produce only a trickle of water as a waste product, instead of sooty exhaust and carbon dioxide gas. The retreat from cars powered by fuel cells counters Mr. Bush’s prediction in 2003 that “the first car driven by a child born today could be powered by hydrogen, and pollution-free.” The Energy Department will continue to pay for research into stationary fuel cells, which Dr. Chu said could be used like batteries on the power grid and do not require compact storage of hydrogen [The New York Times].
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The fast growing plant switchgrass has been heralded as the next generation of biofuel stock: Unlike fertilizer-dependent corn, researchers say it’s highly efficient to grow the grass and process it into ethanol. But a new study suggests that there’s an even better use for switchgrass and other plants. Rather than turning them into ethanol to fill the gas tanks of cars, plants should be burned in power plants to generate “bioelectricity,” which can power electric cars.
Using a sophisticated computer analysis, researchers found that a small sport utility vehicle could do 9,000 highway miles (14,484 km) on the energy produced from an acre of switchgrass converted into ethanol. But converting that biomass into electricity allowed a battery-powered SUV to get 14,000 miles (22,531 km) on the highway…. “One of the driving factors that lead to this result is that the electric motor is much more efficient than the internal combustion engine,” said the lead author of the study, Elliott Campbell [Reuters].
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A new prototype of a wave power generator has been unveiled in England, and its inventors followed the creed espoused by Leonardo da Vinci: “Simplicity is the ultimate sophistication.” The new wave power device, known as Anaconda, is a basic tube made from rubber and fabric and filled with water. It is still in trial phase, but its creators, optimistic about its potential as a source of mass power, are confident it will be cheaper than a wind farm generating the equivalent amount of power and less controversial in terms of public protest since the devices will be below the sea [Telegraph].
The Anaconda rides waves in the ocean, which create bulges along the tubing that travel along its length gathering energy. At the end of the tube, the surge of energy drives a turbine and generates electricity [BBC News]. While similar technology has already been deployed in the coastal waters near Portugal, the inventors of the Anaconda say its mostly rubber composition and its few moving parts combine to give it a sturdy and resilient edge in the tumultuous ocean. Until now, “the problem holding back wave energy machines is they tend to deteriorate over time in the harsh marine environment” [The Guardian], said Rod Rainey, an engineer with the Anaconda project.
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A leading geothermal company has been rocked by an explosion from a well drilled deep into the earth, which was part of a system that converts the heat from buried rocks into clean, green energy. On Friday evening at the South Australian test site, a burst of pressurized water and steam blew through the well “cellar,” the 22-foot deep concrete structure set in the ground through which the deeper well is drilled.
In geothermal energy systems, wells are drilled two or three miles deep and water is circulated past the hot rocks at that depth to collect heat; the resulting steam is then used to run turbines in a power plant. Geodynamics, the Brisbane-based company that operates the South Australia well, is widely tipped as being closest to making the technology cost effective. Geodynamics holds the rights to a potential power supply of up to 10 gigawatts trapped in a 1000-square kilometre slab of hot granite deep under the town of Innamincka in South Australia [New Scientist]. But this accident is an embarrassment for the cutting-edge company. No one was injured by the blast, but the company was forced to suspend work on its first demonstration power plant, and a nearby highway was diverted.
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The U.S. Interior Department announced new rules today that will allow the first offshore wind turbines to go up along the Atlantic Coast, including the site near Cape Cod that the Kennedy family famously opposed. In an Earth Day speech from Iowa, President Obama announced the new rules, which will set long-awaited guidelines for offshore leases, easements and royalty payments that the Bush administration worked on for years but did not complete [Los Angeles Times]. His administration will soon be able to begin leasing tracts off U.S. shores for electricity generation projects using wind and ocean currents [Bloomberg].
The Interior Department recently estimated that offshore wind turbines could someday supply more than enough electricity to meet the nation’s current demand [Los Angeles Times], an encouraging finding for Obama, who has been delaying the Bush-planned expansion of offshore oil drilling since entering office. The new plan is attractive because offshore winds are stronger and more reliable, and because the turbines would be closer geographically to large population centers—a key advantage since transporting wind-produced energy is still an obstacle to its large-scale development.
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By 2016, the energy powering some California homes may come from solar panels orbiting the planet. California’s largest electric utility has announced plans to purchase energy from Solaren Corp., a startup company that hopes to launch the first commercial test of space solar power. Solaren would generate the power using solar panels in Earth orbit and convert it to radio-frequency transmissions that would be beamed down to a receiving station in Fresno…. From there, the energy would be converted into electricity and fed into [the] power grid [MSNBC].
The idea of space-based solar energy has been discussed for decades. It appeared in science fiction as far back as 1941 and later received serious study by NASA and the Pentagon. At times, it has been dismissed as fantasy [San Francisco Chronicle]. But the potential of a solar farm that can generate energy day and night, regardless of the weather, has been enticing enough to keep researchers working on the idea. Now, Solaren CEO Gary Spirnak says the technology is ready for prime time. “While a system of this scale and exact configuration has not been built, the underlying technology is very mature and is based on communications satellite technology,” he said [MSNBC].
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The Kyoto Box, a $6 solar cooker made from cardboard, has won the Financial Times-sponsored Climate Change Challenge contest for innovative ways to decrease the human impact on the environment. Its capacity to not only cook food but also sterilize water could help three billion people reduce their greenhouse gas emissions. The Kenya-based Norwegian creator of the cooker, Jon Bøhmer, has been awarded $75,000 to put the idea into production.
Named after the United Nations’ Kyoto Protocol, the cooker is made from two cardboard boxes, one inside the other, with either paper or straw insulation placed in between; an acrylic cover on top lets in and traps sunlight. Black paint on the inner box, and silver foil on the outer one, help concentrate the heat. The trapped rays make the inside hot enough to cook casseroles, bake bread and boil water [CNN]. Covering the cooking pot with a transparent cover retains heat and water [BBC], and temperatures inside the pot can reach about 175 degrees Fahrenheit.
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A microbial culture could be turned into a living energy storage system, researchers say, which could cheaply stockpile power from inconsistent solar and wind installations. Proponents of these alternative energy sources are investigating many different ways to store power for the inevitable moments when the sun isn’t shining or the wind isn’t blowing. The intriguing new idea involves “feeding” surplus power to the microorganisms instead, which combine it with carbon dioxide to create methane. That could then be stored and burned when needed. The method is sustainable too, as the carbon is taken from the atmosphere, not released from long-term storage in oil or coal [New Scientist].
The researchers have determined that a single-celled microorganism, a type of archaea, uses electricity to convert carbon dioxide and water into methane. Sustainable energy expert Tom Curtis comments that the use of microorganisms, rather than conventional catalysts, is a plus. “There are no noble metals involved, so it should be very cheap,” he says. Of the energy put into the system as electricity, 80% was eventually recovered when the methane was burned – a fairly high efficiency. “You don’t get all the energy back, but that’s a problem with any form of energy storage,” says Curtis [New Scientist].
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The latest advance in battery technology comes from viruses working on the nanoscale. Researchers have constructed a lithium-ion battery, similar to those used in millions of devices, but one which uses genetically engineered viruses to create the negatively charged anode and positively charged cathode [BBC News]. The tiny workers are bacteriophages, viruses that infect bacteria but are harmless to humans.
Three years ago, the same researchers created viruses that collected negatively charged particles of cobalt oxide and gold, which “grew” on a film to create the anode. Now, the researchers have added to that achievement, tackling the trickier task of making cathodes. The work was more difficult because the material had to be highly conductive in order to be effective and most candidate materials for cathodes are highly insulating [BBC News]. The researchers engineered viruses that coat themselves with iron phosphate. Then they then latch onto carbon nanotubes to create a network of highly conductive material [ComputerWorld]. Iron phosphate is generally not a good conductor, but its properties change when it’s organized on the nanoscale.
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As global warming‘s effects become evident researchers have turned to geoengineering schemes that could slow the warming process, like a global “sunshade” produced by spraying sulfur aerosols into the atmosphere to reflect sunlight back into space. But a new study points out an (obvious in retrospect) drawback of that idea: It would seriously reduce the effectiveness of some solar energy facilities, which proponents hope would reduce our dependence on fossil fuels and thus prevent further global warming.
Researchers from the National Oceanic and Atmospheric Administration went back and examined data from 1991, when Mount Pinatubo erupted. The Philippine volcano ejected about 15 million metric tons of sulfur-dioxide–laden dust into the air, cooling the planet’s average temperature by about 0.6°C for nearly 2 years [ScienceNOW Daily News]. The researchers found that the eruption also reduced peak power output at a California solar-thermal plant by 20 percent. Solar thermal plants use arrays of mirrors to concentrate sunlight and turn it into a heat source for a conventional power plant; they are generally cheaper than traditional photovoltaic systems.
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Last year, President Mohamed Nasheed announced that his country would look to buy land for Maldivians to resettle on when sea levels rose and caused the low-lying islands to be uninhabitable. That plan proved too expensive, but Nasheed has now announced a $1.1 billion plan that will shift the Maldives entirely to renewable energy over the next ten years, making it the world’s first carbon-neutral nation.
The archipelago Indian Ocean nation consists of almost of 1,200 islands, of which only about 250 are inhabited. None of the coral islands measures more than 1.8 metres (six feet) above sea level, making the country vulnerable to a rise in sea levels associated with global warming [BBC]. Scientists at a meeting in Copenhagen last week predicted that glaciers and ice sheets melting as a result of global warming could boost the level of the world’s oceans by as much as a metre by the end of the century [CBC].
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The governors of Washington, Oregon, and California are considering plans for a “green freeway” that would see alternative fueling stations implemented along Interstate 5 from Canada to Mexico. As the plan stands, motorists eventually would be able to pull off at I-5 rest stops for more than a cup of coffee and roadside relief: They also would be able to charge, or swap out, their electric-vehicle batteries or fill their tanks with biodiesel, ethanol, hydrogen or compressed natural gas [The Seattle Times].
Opponents to the plan say it would compete with private businesses, but Jeff Doyle from Washington’s Department of Transportation said the state wouldn’t want alternative-fuel stations to disrupt rest-area traffic, so contract companies would have to provide small, low-profile setups. Doyle added that rest-stop fueling sites would be self-service and likely to have little or no on-site staffing [The Seattle Times]. While the plan is facing many rounds of approval before it can become a reality, it does fit into the new administration’s push for green jobs and it would most likely qualify for stimulus money that would get the project going [EcoGeek].
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Energy and environmental issues took center stage in President Barack Obama‘s first speech to a joint session of Congress last night. He asked Congress to send him legislation that would confront global warming by capping carbon dioxide emissions, and emphasized that clean energy technology can help the United States emerge from the recession.
Obama said: “It begins with energy. We know the country that harnesses the power of clean, renewable energy will lead the 21st century…. Well I do not accept a future where the jobs and industries of tomorrow take root beyond our borders—and I know you don’t either. It is time for America to lead again” [The New Republic]. He noted that the stimulus package includes significant investments in alternative energy research and development, as well as money for making buildings more energy efficient and upgrading the electrical grid. He also pledged to double the use of renewable energy and invest $15 billion dollars in the development of new technologies each year – including wind, solar, advanced biofuels, more fuel-efficient automobiles, and “clean coal” [Grist].
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The joke about hydrogen-powered cars is that they’re about 10 years away–and always will be. The technology has been held up largely by the high cost of hydrogen fuel cells, but now researchers say they’ve found a way to bring down the cost dramatically by making a key component out of carbon nanotubes instead of platinum. More than half the cost of fuel-cell stacks comes from platinum, according to the Department of Energy. “Fuel cells haven’t been commercialized for larger-scale applications because platinum is too expensive,” says Liming Dai [Technology Review], the lead author of the new study.
Researcher found that tightly packed, vertically aligned carbon nanotubes doped with nitrogen were more effective as catalysts than platinum, which is usually used to help oxygen react within the fuel cell. That is a vital stage of the fuel cell cycle. Rather than burning fuel to create heat to power a turbine, fuel cells turn chemical energy directly into a flow of electricity. Hydrogen gas, for example, is pumped past one electrode (the anode), where it is split into its constituent electrons and protons. The electrons then flow out of the anode, providing electrical power, while the protons diffuse through the cell. Electrons and protons both end up at a second electrode (the cathode), where they combine with oxygen to form water [New Scientist].
That second reaction is very slow, so engineers have developed cathodes made out of materials that act as chemical catalysts and speed up the reaction. Until now, platinum was considered the best catalyst, but now carbon nanotubes with a trace of nitrogen (the critical ingredient) have left the precious metal in the dust.
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In another step forward for biofuels, a commercial jet took to the skies yesterday over New Zealand to test a new jet fuel blend that uses oil from the oily jatropha plant. Air New Zealand announced that a Boeing 747 plane flew for about two hours yesterday, running on a 50/50 blend of conventional jet fuel and biofuel. Jatropha—a weedy bush from Africa that produces seeds rich in oil—was selected because it is not a food crop and can be grown on land unsuitable for food production. The roughly three tons of liquid jatropha biofuel came from plants grown in India, Malawi, Mozambique and Tanzania, the airline says [Scientific American].
Air New Zealand is the second airline to test-fly a jet plane powered by biofuel. The first was Virgin Atlantic Airways, which in February flew a Boeing 747-400 from London to Amsterdam with one of its four tanks filled with jet fuel containing a 20 percent blend of biofuel made of coconut and babbasu oil [Greentech Media]. Meanwhile, other airlines are developing jet fuels derived from algae or oilseed plants: Continental Airlines and Japan Airlines both have test flights scheduled for January.
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