Solar On Water

I think this could work well on small ponds.

Solar Panels Floating on Water Will Power Japan's Homes

More solar power plants are being built on water, but is this such a good idea?

 

By Bryan Lufkin, for National Geographic

PUBLISHED January 16, 2015
 

Nowadays, bodies of water aren't necessarily something to build around—they're something to build on. They sport not just landfills and man-made beaches but also, in a nascent global trend, massive solar power plants.

Clean energy companies are turning to lakes, wetlands, ponds, and canals as building grounds for sunlight-slurping photovoltaic panels. So far, floating solar structures have been announced in, among other countries, the United Kingdom, Australia, India, and Italy.

The biggest floating plant, in terms of output, will soon be placed atop the reservoir of Japan's Yamakura Dam in Chiba prefecture, just east of Tokyo. When completed in March 2016, it will cover 180,000 square meters, hold 50,000 photovoltaic solar panels, and power nearly 5,000 households. It will also offset nearly 8,000 tons of carbon dioxide emissions annually. (Since the EPA estimates a typical car releases 4.7 tons of CO2 annually, that's about 1,700 cars' worth of emissions.)

The Yamakura Dam project is a collaboration by Kyocera (a Kyoto-headquartered electronics manufacturer), Ciel et Terre (a French company that designs, finances, and operates photovoltaic installations), and Century Tokyo Leasing Corporation.

So, why build solar panels on water instead of just building them on land? Placing the panels on a lake or reservoir frees up surrounding land for agricultural use, conservation, or other development. With these benefits, though, come challenges. (See related story: "How Green Are Those Solar Panels, Really?")

Solar Enters New Territory

"Overall, this is a very interesting idea. If successful, it will bring a huge impact," says Yang Yang, a professor of engineering at the University of California, Los Angeles who specializes in photovoltaic solar panels. "However, I do have concerns of its safety against storms and other natural disasters, not to mention corrosion."

Unlike a solar installation on the ground or mounted on a rooftop, floating solar energy plants present relatively new difficulties. For one thing, everything needs to be waterproofed, including the panels and wiring. Plus, a giant, artificial contraption can't just be dropped into a local water supply without certain precautions, such as adherence to regulations on water quality—a relevant concern, particularly if the structure starts to weather away.

"That is one reason we chose Ciel et Terre's floating platforms, which are 100 percent recyclable and made of high-density polyethylene that can withstand ultraviolet rays and corrosion," says Ichiro Ikeda, general manager of Kyocera's solar energy marketing division.

Another obstacle? Japan's omnipresent threat of natural disasters. In addition to typhoons, the country is a global hot spot for earthquakes, landslides, and tidal waves.

To make sure the platforms could withstand the whims of Mother Nature, Ciel et Terre's research and development team brought in the big guns: a wind tunnel at Onera, the French aerospace lab. The company's patented Hydrelio system—those polyethylene "frames" that cradle the solar panels—was subjected to very high wind conditions that matched hurricane speeds. The system resisted winds of up to 118 miles per hour.

Why Japan Could Be the Perfect Spot

Given its weather, why build floating solar panels in the storm-filled, Ring of Fire-hugging Land of the Rising Sun? The reason: Many nations could benefit from floating solar power. And Japan is their poster child.

The largely mountainous archipelago of Japan suffers from a lack of usable land, meaning there's less room for anything to be built, let alone a large-scale solar plant. However, the nation is rich in reservoirs, since it has a sprawling rice industry to irrigate, so more solar energy companies in Japan are favoring liquid over land for construction sites. Suddenly, inaccessible terrain becomes accessible.

Kyocera's Ikeda says available land in Japan is especially hard to come by these days, as the number of ground-based solar plants in the country has skyrocketed in the past few years. (See related story: "Japan Solar Energy Soars, But Grid Needs to Catch Up.")

But, he added, "the country has many reservoirs for agricultural and flood-control purposes. There is great potential in carrying out solar power generation on these water surfaces."

In Japan's case, Ciel et Terre says that the region's frequent seismic fits aren't cause for concern, either. In fact, they illustrate another benefit that floating solar panels have over their terrestrial counterparts, the company says.

"Earthquakes have no impacts on the floating photovoltaic system, which has no foundation and an adequate anchoring system that ensures its stability," says Eva Pauly, international business manager at Ciel et Terre. "That's a big advantage in a country like Japan."

Solar's Potential Ecological Impact

Floating solar panel manufacturers hope their creations replace more controversial energy sources.

"Japan needs new, independent, renewable energy sources after the Fukushima disaster," says Pauly. "The country needs more independent sources of electricity after shutting down the nuclear power and relying heavily on imported liquid gas."

This up-and-coming aquatic alternative impacts organisms living in the water, though. The structure stymies sunlight penetration, slowly making the water cooler and darker. This can halt algae growth, for example, which Ciel et Terre project manager Lise Mesnager says "could be either positive or negative." If there's too much algae in the water, the shadow-casting floating panels might be beneficial; if the water harbors endangered species, they could harm them.

"It is really important for the operator to have a good idea of what kind of species can be found in the water body," Mesnager says.

Since companies must follow local environmental rules, these solar plants are usually in the center of the water, away from banks rich with flora and fauna. Plus, companies might prefer building in man-made reservoirs instead of natural ones, as the chances of harming the area's biodiversity are smaller.

Could the Future Include Salt Water?

More than three-quarters of our planet is ocean, which might present alternative energy companies a blank canvas on which to dot more buoyant energy farms. But moving floating panels to the open sea is still in the future. Kyocera's Ikeda says it would bring up a whole new realm of issues, from waves to changing water levels, which could lead to damage and disrupted operations.

Ciel et Terre is experimenting with salt water-friendly systems in Thailand, but ocean-based plants might be impractical, as offshore installations are costly, and it's more logical to produce electricity closer to where it'll be used.

For now, companies are aiming to build floating energy sources that conserve limited space, are cheaper than solar panels on terra firma, and are, above all, efficient. Ciel et Terre says that since its frames keep Kyocera's solar panels cool, the floating plant could generate up to 20 percent more energy than a typical ground system does.

The Yamakura Dam project might be the world's biggest floating solar plant, but it wasn't the first-and it almost certainly won't be the last.

The story is part of a special series that explores energy issues. For more, visit The Great Energy Challenge.

http://news.nationalgeographic.com/news/energy/2015/01/150116-floating-solar-power-japan-yamakura/#

 

War On Drugs Backfires

One of the best articles I have read on the War On Drugs -

How the war on drugs creates violence

By Danielle Allen October 16

Danielle Allen is a political theorist at Harvard University and a contributing columnist for The Post.

To argue for legalization of marijuana and decriminalization of other drugs does not, at first blush, appear to put one on the side of the angels, especially given the accelerating heroin epidemic. But legalization and decriminalization are what we need if we want to make headway against mass incarceration, high homicide rates in urban black communities and poor educational outcomes in urban schools. If we view drug use as a public health problem, not a crime, we can fight drugs without producing the other sorts of social damage we see all around us.

Americans from all racial groups pursue narcotic-related leisure activities, spending an estimated $100 billion a year on their illegal drugs, according to a report from the White House Office of National Drug Control Policy. In this current period of fairly active military engagement, the nation’s defense budget is roughly $600 billion. In other words, our culture of illegal drug use must be pretty important to amount to a full sixth of our budget for national defense.

Yet despite this evidence of far-reaching social acceptance of illegal drug use, we continue to lock up nonviolent offenders. Ceasing this hypocritical practice by releasing nonviolent offenders is morally urgent. Yet this would be only a small step toward rectification of the problem of mass incarceration. As the Web site FiveThirtyEight recently reported, such a move would reduce our state and federal prison populations by only about 14 percent. We would still be the world’s leading imprisoner.

The further-reaching reason to legalize marijuana and decriminalize other drugs flows from how the war on drugs drives violent crime, which in turn pushes up incarceration and generates other negative social outcomes. You just can’t move $100 billion worth of illegal product without a lot of assault and homicide. This should not be a hard point to see or make. Criminologists and law enforcement personnel alike acknowledge that the most common examples of “criminogenic trends” that generate increases in murder and other violent crimes are gang- and drug-related homicides.

But there is also another, more subtle connection between the drug war and violence, pinpointed by economists Brendan O’Flaherty and Rajiv Sethi . As they argue, above-average homicide rates will result from low rates of successful investigation and prosecution of homicide cases. If you live in an environment where you know that someone can shoot you with impunity, you are much more likely to be ready to shoot to kill at the first sign of danger. When murder goes unpunished, it begets more murder, partly for purposes of retaliation, partly because people are emboldened by lawlessness, but also as a matter of preemption. Unpunished murder makes everyone (including police) trigger-happy. Such places operate according to the dictum that the best defense is a strong offense.

Major urban centers of the drug trade are just such environments, plagued by low clearance rates for homicide. In Detroit, in the years approaching the city’s bankruptcy, the homicide clearance rate verged on single digits. In Chicago, in 2009, police cleared only 30 percent of homicide cases, many of them without charges. In one Los Angeles Police Department bureau, clearance rates in the 60s mask the low rate of cases ending in arrest and prosecution. And clearance rates are lowest when victims are black and brown, as Jill Leovy explains in her new book, “Ghettoside.” In contrast, in the 1960s, in the United States, the average clearance rate for homicide was above 90 percent, according to NPR.

Why have homicide clearance rates fallen so low in these cities? According to criminologist Charles Wellford, drug-related homicides are harder to investigate, possibly because they are more likely to be stranger-to-stranger incidents and possibly because the drug business generates witness-suppression systems. Additionally, stop-and-frisk tactics have eroded trust in police and further diminished the willingness of witnesses to testify. And, recently, justified anger over police violence has further reduced the capacity of the police to function well in investigating homicides.

Finally, an overloaded judicial system may well put prosecutors in a position where they wish to pursue only open-and-shut cases that will generate plea deals. According to a retired police officer interviewed by NPR, Vernon Geberth , police nowadays have a higher bar to get over in trying to clear a case because prosecutors want only those easier cases.

And what is the No. 1 source of this prosecutorial overload? According to federal judicial caseload statistics, in U.S. district courts in 2013, 32 percent of defendant filings were for drug-related cases, making this the biggest category of filings. State judicial systems, too, have been significantly strained for financial resources and personnel by drug-related casework. Add to this picture the fact that plenty of violent offenders in our nation’s prisons started out as nonviolent drug offenders, and you have a complete picture of just how much the drug war itself has been a generator of violence.

The drug war is a perfect example of the breakdown of the rule of law and the knock-on effects of such a breakdown. Our drug laws are fundamentally unenforceable, and this distorts the judicial system, including by producing prosecutorial overload, which is a driver of low homicide clearance rates, which beget a culture of increasing violence, which puts more fathers of young children behind bars or under the ground, makes it harder for children in poor, urban areas to walk to school safely, and forces on those children a choice between the culture of the schools, inside the rule of law, and the culture of the streets, outside the rule of law. Since Plato, we have known that the power of schools to develop the minds of the young depends on an alignment of the worlds inside and outside the school. The culture of violence in urban areas, begotten by the war on drugs and a reflection of the failure of the rule of law, is the opposite of a healthy context for learning.

Why is it so hard for us to see how profoundly a $100 billion illegal market in anything, even in popcorn or “My Little Pony” toys, would distort a society? Can there be any other reason for our failure to see this than that black and brown people bear the brunt of these distortions? If we care for the safety and happiness of the whole of our society, as we must, then it is time to legalize marijuana, decriminalize other drugs and recast drug use as a public health problem, not a crime.

https://www.washingtonpost.com/opinions/how-the-war-on-drugs-creates-violence/2015/10/16/6de57a76-72b7-11e5-9cbb-790369643cf9_story.html