Energywise iconEnergywise

Solar Power Generation Could Exceed California's Demand Up to 5 Times

Solar energy could exceed California's current energy demand three to five times using equipment built on and around the state's existing infrastructure, claim researchers at the Carnegie Institution for Science at in Stanford, Calif. They detailed their findings online March 16 in the journal Nature Climate Change.

With a total area of more than 400,000 square kilometers, California has more land than 189 countries, including Germany. A little more than 8 percent of this land has already been developed by humans. The Stanford scientists explored how much opportunity this developed land presented for power generation via photovoltaic solar power and concentrating solar power. Photovoltaics convert light directly into electricity, whereas concentrating solar power typically uses concentrated sunlight to heat fluid that drives a steam turbine to generate electricity.

Read More

Porous Crystal Supersuckers Capture Carbon

Porous crystals could scrub carbon dioxide from industrial fumes for half the energy often needed now, scientists say. These novel materials could also help clean the air in submarines and on the International Space Station.

All in all, these new materials could slash the amount of energy now consumed in carbon capture by half or more, researchers at the University of California, Berkeley say. They detailed their findings in the March 12 issue of the journal Nature.

Read More

Spider Silk Smooths Path to Better Batteries

Spider silk could help boost the performance of lithium-ion batteries, say scientists at the Beijing Institute of Technology, in China.

Graphite is a key component of the lithium-ion batteries that power everything from mobile devices to electric cars. When lithium-ion batteries charge, ions of lithium diffuse from the positive electrode to the negative electrode and attach to the graphite there, and when they discharge, the lithium ions move from the graphite back to the positive electrode.

However, graphite is relatively bad at storing lithium ions, which substantially limits the energy capacity of conventional lithium ion batteries. Now scientists at the Beijing Institute of Technology now suggest that silk could help replace this graphite and significantly improve battery performance.

The strength and flexibility of silk has previously attracted research into whether or not it can be incorporated into electronics. For instance, a prior study coated spider silk fibers with carbon nanotubes to make it electrically conductive and three times tougher than regular spider silk fibers as well. And 

In the new work, the investigators found a way to chemically process natural silk turning it into porous nitrogen-laced sheets of carbon only 15 to 30 nanometers thick. The electron-rich nitrogen atoms improve the conductivity of the material and help create additional sites to put lithium ions.

They incorporated the new material into prototype batteries and supercapacitors in a one-step technique they say can easily be scaled up. In the battery, the new material could store five times more lithium than graphite, while the supercapacitor proved very stable, working for more than 10,000 cycles of recharging and discharging with only a 9 percent loss in stability.

The scientists detailed their findings online last month in the journal ACS Nano.

Japan Demoes Wireless Power Transmission for Space-Based Solar Farms

With a few exceptions, sources of renewable energy tend to be inconveniently unreliable. Things like wind and wave energy are subject to the whims of weather, and even if you manage to find something that isn’t weather dependent (like tidal flow), you still can’t rely on a constant output of power. Strictly speaking, solar power is the worst: it's heavily weather dependent, and half the time, it doesn't work at all. (Even the moon gets in the way sometimes.)

Some think the way to make solar power the backbone of a renewable energy economy is to avoid the problematic Earth entirely and head out into space, where the sun is always shining and weather means something entirely different. Solar power satellites (SPS) are more than a concept: it’s an area of active research and development, led by the Japan Aerospace Exploration Agency (JAXA). JAXA explained its 25 year technology development roadmap that culminates in a 1 gigawatt SPS sending solar power back to Earth in the 2030s in IEEE Spectrum last year. Last week, JAXA and Mitsubishi demonstrated their progress on one of the most difficult components of that system: long range wireless power transmission.

Read More

Solar Eclipse Will Test European Power Grids

A partial eclipse of the sun headed for Europe next Friday has grid operators in a tizzy. On the morning of March 20 Europe's skies will darken for the first time since solar power became a meaningful piece of some countries’ power supply, and the impact could be dramatic.

“It’s a very, very big challenge for the transmission system operators in Europe,” says Enrico Maria Carlini, Head of Electric System Engineering for National Dispatching at Rome-based Italian transmission system operator Terna.

The Brussels-based European Network for Transmission System Operators for Electricity (ENTSO-E) judges in an eclipse impact analysis released last month that it poses a, “serious challenge to the regulating capability of the interconnected power system.”

Read More

First Manganese-based Superconductor Discovered

Scientists have unexpectedly discovered the first manganese-based superconductor, an element whose magnetism was thought to be too strong to permit superconductivity. This research might lead to new superconductors that can better resist magnetic disruption.

Superconductors are materials that conduct electricity without dissipating energy. Superconductivity relies on electrons not repelling each other as they do in ordinary materials, but instead forming delicate couples known as Cooper pairs, which can flow with zero resistance.

Read More

Censors Take On China's Silent Spring Moment

Chinese censors took down a hugely popular documentary on China’s air pollution crisis this past weekend, according to reports by the Wall Street Journal and the New York Times. Under the Dome, a polished, 104-minute report by Chinese broadcast journalist Chai Jing [embedded below], had gone viral after its release last week, attracting several hundred million views in China before censors restricted domestic access to the video and squelched news coverage of it. 

The film is a damning account of China’s declining air quality, the sources of its pollution, and the toothlessness of environmental agencies charged with controlling it. It’s a wide-ranging production that tries to explain the price China has paid for its industrialization and wealth generation, as well as a passionate call to action.

For me, the film’s visceral portrayal of contemporary life amidst smog—and the movie’s historic sweep—sparked flashbacks to my own discomfort breathing in Chinese air during visits in 1991, 2005, and 2006. 

In 1991, my eyes burned as the aging cruise liner I’d taken over from Japan motored up the Huangpu River, past the petrochemical plants then lining the river’s eastern banks, on its way into Shanghai. But the historic city across the river was clean. Aside from a few buses, it was a city that still moved on pollution-free pedal power, its streets a flood of bicycles. And as I traveled inland for several weeks, the pollution faded further, revealing China’s natural beauty. 

When I flew into Shanghai 14 years later to report on China’s rising tide of electric bicycles for IEEE Spectrum, Shanghai itself seemed still cleaner than I’d recalled. While cars and trucks were on the rise, the East-bank industry had been cleared to make way for gleaming skyscrapers. 

But China was clearly changing. I visited smaller cities where smog nearly blocked out the sun. Among these was Jinhua, a city of about 1 million people in Zhejiang Province, where I visited an electric bike factory. E-bike shop owners there told me that the e-bike’s lack of tailpipes was already an attractive selling feature for Jinhua residents who feared the ill-effects of the air they breathed. 

Like a child who seems to grow six inches overnight, the situation seemed far worse when I found myself back in China just 18 months later to cover the nation’s exploding consumption of coal for Technology Review magazine. Shanghai’s air was foul, and I encountered far worse as I traveled north towards Beijing. On one unforgettable stop in the fast-growing city of Zaozhuang in Shandong Province, I found myself momentarily trying not to breathe.   

Under the Dome is a well-documented and artfully executed exposé of what was choking Shandong and Shanghai then and would get worse in the years that followed: poorly-regulated combustion of coal and low-grade petroleum. 

Chai Jing’s self-financed film mixes gotcha reporting, data, graphics, and interviews with scientists and government officials to illuminate China’s air pollution problem from every imaginable angle. She identifies what smog is (chemically-laced particles of soot) and where it comes from (60 percent from burning coal and oil). And she peels back the layers of factors—including economic imperatives, weak environmental enforcement, and corruption—hindering efforts to clean it up. 

Her constant companions throughout the film are officials from China’s Ministry of Environmental Protection (MEP) who, time and again, appear helpless to enforce anti-pollution edicts from Beijing that have been on the books for over a decade. 

At a steel plant in Hebei Province, immediately south of Beijing, Chai and MEP inspectors witness smoke billowing around the mandated equipment that is supposed to be sucking it up and filtering out the soot. But MEP officials tell Chai, on camera, that they are powerless to enforce the law because they lack the political heft to make penalties stick. 

Xiong Yuehui, who runs the MEP’s Department of Science, Technology and Standards, explains that steel plants like the one she visited provide 100,000 jobs in Hebei and are therefore untouchable: 

“They act with utter recklessness. Their operations are completely unlicensed. The inspectors don’t even want to go or touch this industry in any way. It’s reached the point where no one can stop them.”

Off-camera another MEP officer confides that that he feels sometimes that he is “nothing more than a mascot.” 

The most chilling scene unfolds at a fueling station where inspectors ask for a sample of diesel fuel so they can analyze it for compliance with fuel quality standards. Rather than comply, the station owner brazenly takes the MEP inspector’s ID card, and rejects his power to conduct random inspections. “You have the obligation, but not the authority,” he tells the MEP officer. Chai shows that, thanks to vague wording of the nation’s anti-pollution laws, it appears the station owner may be right. 

The film closes with a call to action by “ordinary people.” Chai exhorts viewers to call the government’s environmental hotline, to photograph environmental abuses by polluters, and to otherwise demand change. “Even the world’s most powerful government can’t control pollution by itself,” says Chai. “It needs to rely on ordinary people like you and me—our choices and our determination.”

The film also sets China’s battle against pollution in the context of other global environmental battles. Rachel Carson, author of the epic anti-chemicals book “Silent Spring,” gets one of the last words, speaking knowledge to power about an impending “disaster” if chemical use is not controlled. 

Last week, China’s environmental protection minister, Chen Jining, compared Under the Dome to “Silent Spring,” according to the Guardian, a U.K. newspaper. Jining is quoted as saying that the film had, “an important role in promoting public awareness of environmental health issues.”

Some industrialists appear to agree; they have tried to undermine Chai’s credibility just as the chemical industry attacked Carson. Last week, Forbes covered online comments attributed to Wan Zhanxiang, an official at China National Petroleum Corporation, who wrote that Chai had no “insight” and posited that, “Maybe she doesn’t have enough brains.” 

For now, such commentary for and against the film and its maker is likely to die down within China—or at least go underground. According to the New York Times report, Chinese propaganda officials have ordered news organizations not to report on the film, and banned its distribution via video websites. A set of editorials for and against the documentary that was slated to run in the Global Times, a newspaper managed by the People’s Daily, was spiked.

Smarter Systems Make Web Surfing on Your Phone Less of a Battery Drain

According to forecasts by the International Data Corporation, more people will surf the Web this year using their mobile devices than will do so on desktop or laptop computersBut the growing complexity of Web pages means that mobile Web browsing has become an increasing drain on the batteries of mobile devices. The increasingly common result is that a handset’s battery life is significantly diminished or mobile Web browsing slows to a creep to conserve energy. Smartphone users aren’t happy with either outcome. And online businesses stand to lose money from potential customers if mobile devices can’t deliver a seamless Web-browsing experience.

Read More

The Power Suit of the Future

A flexible, durable cloth that generates power from the same effect behind most static electricity could harvest energy from human motion to power wearable gadgets, researchers in Korea and Australia say.

Wearable devices such as the soon-to-drop Apple Watch are growing increasingly popular, but these gizmos are often limited by stiff batteries with limited lives. Although flexible, stretchable batteries do exist, they are often relatively flimsy and have very short battery lifetimes.

Read More

Electric Field Would Improve Flow in Keystone Pipeline

According to tests conducted on a stretch of the controversial Keystone oil pipeline which runs between the United States from Canada, electric fields could help improve oil flow, an advance that could save major amounts of energy during pumping.

Reducing the viscosity of crude oil helps it flow better, cutting down the amount of energy needed to pump it. Oil is usually heated in pipelines to decrease its viscosity, but this requires a lot of energy and counter-productively drives up turbulence in the oil, which makes pumping more difficult.

Read More

Newsletter Sign Up

Sign up for the EnergyWise newsletter and get biweekly news on the power & energy industry, green technology, and conservation delivered directly to your inbox.

Load More