Germans to shut down Nuclear Plants by 2022

Germany's coalition government has announced a reversal of policy that will see all the country's nuclear power plants phased out by 2022.

The decision makes Germany the biggest industrial power to announce plans to give up nuclear energy.

Environment Minister Norbert Rottgen made the announcement following late-night talks.

Chancellor Angela Merkel set up a panel to review nuclear power following the crisis at Fukushima in Japan.

There have been mass anti-nuclear protests across Germany in the wake of March's Fukushima crisis, triggered by an earthquake and tsunami.

'Sustainable energy'

Mr Rottgen said the seven oldest reactors - which were taken offline for a safety review immediately after the Japanese crisis - would never be used again. An eighth plant - the Kruemmel facility in northern Germany, which was already offline and has been plagued by technical problems, would also be shut down for good.

Six others would go offline by 2021 at the latest and the three newest by 2022, he said.

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Analysis

Stephen Evans

BBC News, Berlin

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Nearly a quarter of German's electricity comes from nuclear power so the question becomes: How do you make up the short-fall?

The official commission which has studied the issue reckons that electricity use can be cut by 10% in the next decade through more efficient machinery and buildings.

The intention is also to increase the share of wind energy. This, though, would mean re-jigging the electricity distribution system because much of the extra wind power would come from farms on the North Sea to replace atomic power stations in the south.

Protest groups are already vocal in the beautiful, forested centre of the country which, they fear, will become a north-south "energie autobahn" of pylons and high-voltage cables.

Some independent analysts believe that coal power will benefit if the wind plans don't deliver what is needed.

And on either side of Germany is France, with its big nuclear industry, and Poland, which has announced an intention to build two nuclear power stations.
Mr Rottgen said: "It's definite. The latest end for the last three nuclear power plants is 2022. There will be no clause for revision."

Mr Rottgen said a tax on spent fuel rods, expected to raise 2.3bn euros (£1.9bn) a year from this year, would remain despite the shutdown.

Mrs Merkel's centre-right Christian Democrats met their junior partners on Sunday after the ethics panel had delivered its conclusions.

Before the meeting she said: "I think we're on a good path but very, very many questions have to be considered.

"If you want to exit something, you also have to prove how the change will work and how we can enter into a durable and sustainable energy provision."

The previous German government - a coalition of the centre-left Social Democrats (SPD) and the Greens - decided to shut down Germany's nuclear power stations by 2021.

However, last September Chancellor Angela Merkel's coalition scrapped those plans - announcing it would extend the life of the country's nuclear reactors by an average of 12 years.

Ministers said they needed to keep nuclear energy as a "bridging technology" to a greener future.

The decision to extend was unpopular in Germany even before the radioactive leaks at the Fukushima plant.

But following Fukushima, Mrs Merkel promptly scrapped her extension plan, and announced a review.

Greens boosted

Germany's nuclear industry has argued that an early shutdown would be hugely damaging to the country's industrial base.

Before March's moratorium on the older power plants, Germany relied on nuclear power for 23% of its energy.

The anti-nuclear drive boosted Germany's Green party, which took control of the Christian Democrat stronghold of Baden-Wuerttemberg, in late March.

Shaun Burnie, nuclear adviser for environmental campaign group Greenpeace International, told the BBC World Service that Germany had already invested heavily in renewable energy.

"The various studies from the Intergovernmental Panel on Climate Change show that renewables could deliver, basically, global electricity by 2050," he said.

"Germany is going to be ahead of the game on that and it is going to make a lot of money, so the message to Germany's industrial competitors is that you can base your energy policy not on nuclear, not on coal, but on renewables."

Shares in German nuclear utilities RWE and E.On fell on the news, though it had been widely expected.

But it was good news for manufacturers of renewable energy infrustructure.

German solar manufacturer, Solarworld, was up 7.6% whilst Danish wind turbine maker Vestas gained more than 3%.

MIT researchers use virus to improve solar cell efficiency by a third

MIT researchers use virus to improve solar cell efficiency by a third
Solas Power has learned that researchers at MIT have found a way to make significant improvements to the power-conversion efficiency of solar cells by enlisting the services of tiny viruses to perform detailed assembly work at the microscopic level, according to MIT News.

In a solar cell, sunlight hits a light-harvesting material, causing it to release electrons that can be harnessed to produce an electric current. The new research, published online in the journal Nature Nanotechnology, is based on findings that carbon nanotubes — microscopic, hollow cylinders of pure carbon — can enhance the efficiency of electron collection from a solar cell’s surface.

Previous attempts to use the nanotubes, however, had been thwarted by two problems. First, the making of carbon nanotubes generally produces a mix of two types, some of which act as semiconductors (sometimes allowing an electric current to flow, sometimes not) or metals (which act like wires, allowing current to flow easily). The new research, for the first time, showed that the effects of these two types tend to be different, because the semiconducting nanotubes can enhance the performance of solar cells, but the metallic ones have the opposite effect. Second, nanotubes tend to clump together, which reduces their effectiveness.

And that’s where viruses come to the rescue. Graduate students Xiangnan Dang and Hyunjung Yi — working with Angela Belcher, the W. M. Keck Professor of Energy, and several other researchers — found that a genetically engineered version of a virus called M13, which normally infects bacteria, can be used to control the arrangement of the nanotubes on a surface, keeping the tubes separate so they can’t short out the circuits, and keeping the tubes apart so they don’t clump.

The system the researchers tested used a type of solar cell known as dye-sensitized solar cells, a lightweight and inexpensive type where the active layer is composed of titanium dioxide, rather than the silicon used in conventional solar cells. But the same technique could be applied to other types as well, including quantum-dot and organic solar cells, the researchers say. In their tests, adding the virus-built structures enhanced the power conversion efficiency to 10.6% from 8% — almost a one-third improvement.

This dramatic improvement takes place even though the viruses and the nanotubes make up only 0.1% by weight of the finished cell. “A little biology goes a long way,” Belcher says. With further work, the researchers think they can ramp up the efficiency even further.

The viruses are used to help improve one particular step in the process of converting sunlight to electricity. In a solar cell, the first step is for the energy of the light to knock electrons loose from the solar-cell material (usually silicon); then, those electrons need to be funneled toward a collector, from which they can form a current that flows to charge a battery or power a device. After that, they return to the original material, where the cycle can start again. The new system is intended to enhance the efficiency of the second step, helping the electrons find their way: Adding the carbon nanotubes to the cell “provides a more direct path to the current collector,” Belcher says.

The viruses actually perform two different functions in this process. First, they possess short proteins called peptides that can bind tightly to the carbon nanotubes, holding them in place and keeping them separated from each other. Each virus can hold five to 10 nanotubes, each of which is held firmly in place by about 300 of the virus’s peptide molecules. In addition, the virus was engineered to produce a coating of titanium dioxide (TiO2), a key ingredient for dye-sensitized solar cells, over each of the nanotubes, putting the titanium dioxide in close proximity to the wire-like nanotubes that carry the electrons.

The two functions are carried out in succession by the same virus, whose activity is “switched” from one function to the next by changing the acidity of its environment. This switching feature is an important new capability that has been demonstrated for the first time in this research, Belcher says.

In addition, the viruses make the nanotubes soluble in water, which makes it possible to incorporate the nanotubes into the solar cell using a water-based process that works at room temperature.

Prashant Kamat, a professor of chemistry and biochemistry at Notre Dame University who has done extensive work on dye-sensitized solar cells, says that while others have attempted to use carbon nanotubes to improve solar cell efficiency, “the improvements observed in earlier studies were marginal,” while the improvements by the MIT team using the virus assembly method are “impressive.”

“It is likely that the virus template assembly has enabled the researchers to establish a better contact between the TiO2 nanoparticles and carbon nanotubes. Such close contact with TiO2 nanoparticles is essential to drive away the photo-generated electrons quickly and transport it efficiently to the collecting electrode surface.”

Kamat thinks the process could well lead to a viable commercial product: “Dye-sensitized solar cells have already been commercialized in Japan, Korea and Taiwan,” he says. If the addition of carbon nanotubes via the virus process can improve their efficiency, “the industry is likely to adopt such processes.”

Belcher and her colleagues have previously used differently engineered versions of the same virus to enhance the performance of batteries and other devices, but the method used to enhance solar cell performance is quite different, she says.

Because the process would just add one simple step to a standard solar-cell manufacturing process, it should be quite easy to adapt existing production facilities and thus should be possible to implement relatively rapidly, Belcher says.

The research team also included Paula Hammond, the Bayer Professor of Chemical Engineering; Michael Strano, the Charles (1951) and Hilda Roddey Career Development Associate Professor of Chemical Engineering; and four other graduate students and postdoctoral researchers. The work was funded by the Italian company Eni, through the MIT Energy Initiative’s Solar Futures Program.

MIT News web.mit.edu/newsoffice

German Green Party move forward in Germany

Germany’s Green party will make its debut in power this May as part of a coalition with the Social Democrats in one of the country’s south-western states.

The centre-left Social Democrat party SPD reportedly signed an agreement with the Greens this week after beating the conservative party for the rein in Baden-Wuerttemberg in March.

Green party politician Winfried Kretschmann will be the party’s first member to lead a German state.

The change follows 58 years of control by the Christian Democrats in the state.

The Green party will have a greater share of power in the state as it led the votes by one percentile point.

Kretschmann said he hopes the coalition seat will become a model for other states in the country, according to reports.

Concerns over nuclear power are thought to have prompted the switch to green leadership. Germany’s Chancellor Angela Merkel has until now supported nuclear power, but put a moratorium on seven nuclear plants following radiation leaks at the Fukushima plant in Japan.

The newly-found power in the hands of the Greens could signal a step-change away from nuclear power in the rest of the country.