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ACWA Power has announced that China’s Silk Road Fund will acquire a 24.01{0b7da518931e2dc7f5435818fa9adcc81ac764ac1dff918ce2cdfc05099e9974} equity interest in the 700MW DEWA Concentrated Solar Power (CSP) project in the United Arab Emirates.

Present at the signing was Chinese President Xi Jinping, the Vice President and Prime Minister of the United Arab Emirates (UAE), Sheikh Mohammed bin Rashid Al Maktoum, and the Crown Prince of Abu Dhabi, Sheikh Mohammed bin Zayed Al Nahyan, His Excellency Saeed Mohammed Al Tayer, MD & CEO of Dubai Electricity and Water Authority (DEWA), and Yanzhi Wang, President of the Silk Road Fund.

Rajit Nanda, Chief Investment Officer of ACWA Power, said: “I am delighted that we have reached an agreement to introduce an investor of the quality and international reputation of the Silk Road Fund.

“This investment is a testimony to the strong track record ACWA Power has already demonstrated as a reliable and responsible project developer and operator.”

DEWA CSP project

The DEWA CSP project, which was awarded to an ACWA Power led consortium in 2017, is the 4th phase of the Mohamed bin Rashid Solar Park, the largest single-site concentrated solar power plant in the world.

The project uses a state-of-the-art combination of a central tower and parabolic trough technologies to collect energy from the sun, store it in molten salt and produce steam as required to generate electricity during the day and throughout the night. Read more: World Bank provides funding for Morocco’s Noor-Midelt complex

The project is projected to deliver electricity at a levelised tariff of $7.30 cents per kilowatt-hour 24 hours a day; a cost level that competes with fossil fuel generated electricity without subsidy for reliable and dispatchable solar energy around the clock.

The plant will support the Dubai Clean Energy strategy 2050 to increase the share of clean energy in Dubai to 25{0b7da518931e2dc7f5435818fa9adcc81ac764ac1dff918ce2cdfc05099e9974} by 2030, and is expected to provide anannual saving of 2.4 million tonnes of CO2. Read more: S.Africa: Central Energy Fund signs 100MW CSP deal

New investment

Silk Road Fund is a market-oriented, international and professional medium to long-term development and investment institution. It invests in a broad spectrum of sectors under the framework of the “Belt and Road” initiative including infrastructure, energy resources, industrial capacity cooperation and financial cooperation.

Paddy Padmanathan, Chief Executive Officer of ACWA Power, said: “The introduction of a new investor into the DEWA CSP is absolutely in line with ACWA Power’s established strategy of sharing investments with value adding partners who will in turn bolster our projects.

“We could not have found a more capable partner than Silk Road Fund to complement DEWA and us on what is the largest single renewable energy project underway in the world today.”

He added: “This co-investment also is in keeping with our investment strategy of efficiently deploying our own capital to retain a meaningful level of equity interest in each project that is sufficient to permit us to be the long-term investor with de facto control over the investment and for us to remain focused on reliably delivering electricity and desalinated water at low cost.”

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ELKMONT — Just outside Elkmont in north Limestone County is a farm of sorts, but with solar power, not crops.

PJ Kraft Solar Farm, a 200-kilowatt system that’s equipped with 666 solar panels, stretches across a quarter of an acre at Hays Mill and Sandlin roads and generates enough electricity to power 50 homes a year, said Chuck Boggs, the CEO of ACE LLC Solar.

The Pulaski, Tennessee, energy contracting company partnered with PJ Kraft Solar Enterprises LLC of Baton Rouge, Louisiana, on the project, which was activated in November 2016.

“The project helps reduce the CO2 footprint and reduce overall energy costs to consumers,” said Boggs, who’s also counting on the company’s four solar projects for his retirement.

The solar operation will generate and sell electricity to the Tennessee Valley Authority for a 20-year period, he said.

“We plan to expand sometime next year, with another 200 kilowatts,” said Boggs, whose company designed and built the system and will maintain it. He said it was built to sustain 120-mph winds.

The program is among the TVA’s growing renewable energy portfolio.

“In 2008, the TVA sourced renewable energy from five locations in the Tennessee Valley,” TVA spokesman Scott Fiedler said. “In 2018, it’s grown to over 3,500 locations.

“Renewable energy has a bright future in the Tennessee Valley.”

On the east side of Interstate 65, McCarthy Building Companies Inc. is building the 20-megawatt Cumberland Solar Project on 130 acres at 26754 Mooresville Road.

Construction of that project started in late February, said Adam Pratt, a project manager for McCarthy who’s the project manager for the Cumberland Solar Project. It’s scheduled to be completed in December.

Power from the solar array will be transmitted onto the TVA system, and TVA entered into a long-term agreement with Nashville-based Silicon Ranch, the project’s developer, owner and operator, to buy power from the solar facility, the companies said in a release.

The project will consist of assembling, installing and wiring horizontal 540 single-axis trackers supporting 170,220 solar panels, according to the companies. Once completed, it’s expected to generate enough power for 3,000 homes.

“This project supports TVA’s mission of service and helps us deliver reliable, low-cost, carbon-free electricity to the 9 million people of the Tennessee Valley,” said Jay Stowe, senior vice president Distributed Energy Resources for TVA, in a release.

Over the next 20 years, TVA will invest about $8 billion to support its renewable energy portfolio to help customers meet their carbon-reduction goals, Stowe said.

Boggs didn’t disclose the partners’ investment in the PJ Kraft Solar Farm.

“We’ve gotten 80 percent of our investment back already, and it’s been two years,” Boggs said. “We look to have all our investment back within four-and-a-half to five years.”

Among incentives the partners received was a 30 percent federal Investment Tax Credit that’s available for residential and commercial solar projects.

“We also participated in the AlabamaSAVES Program and were able to get a substantial discount on a loan” to finance the project, Boggs said.

Since PJ Kraft Solar Farm’s activation, the system has produced 565 megawatt hours of energy, enough power to charge 23,551 electric cars or 101,564,405 smartphones, according to ACE LLC.

The company also designed, installed and maintains the solar energy system at Cinemagic Theatre in Athens, which has been active since the first part of July 2017.

Matt Beasley, chief marketing officer with Silicon Ranch, said it’s too early to provide a total capital cost that the firm will be investing in the Cumberland project.

“Silicon Ranch is funding the project and will own and operate the plant for the long term, an approach we take to every project in our portfolio,” Beasley said.

McCarthy said it plans to hire upward of 120 workers to build the project, with the majority being recruited from the local community. 

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You could call him India’s canniest real estate investor. Or you could suggest that he was helped by those who knew he was the son-in-law of India’s most powerful politician. But whichever way to you want to see Robert Vadra, there is little doubt that he made, and is still making, his biggest killing in the deserts of Rajasthan, a state run by a Congress government under Ashok Gehlot.

Parts of this story have already been told in the media, including Firstpost. What we now bring you is the real scale of Vadra’s land holdings, and the humongous profit potential embedded in owning over 10,000 acres of land acquired for a song from unwary farmers. While his mother-in-law is trying to ensure that farmers get more than market prices, Vadra’s caper is about skimming the cream himself with inside knowledge.

Sixty percent of the state (208,110 sq km) is low-cost desert land. It is dead land with no water or habitation in sight. The cost is often as low as Rs 20,000 an acre at some places. You can’t make a killing unless you know someone would want to buy land at significantly a higher price than this.

In this desert state, Vadra picked up piece by piece of wasteland that was strategically located near power sub-stations in Bikaner and elsewhere. And from the few examples at hand, he is raking it in. A plot of 30 hectares costing Rs 4.45 lakh bought two years ago now fetches nearly Rs 2 crore!

No applause please: Vadra has proven to be an astute investor in realty. PTI

No applause please: Vadra has proven to be an astute investor in realty. PTI

Not only that, but in some places he is practically a monopoly seller of the land. In Kolayat, for example, Vadra calls the shots. His companies own nearly 90 percent of the wasteland there.

Through his agents and companies, he directly bought hundreds of acres of land from small and big farmers in areas with solar power potential. According to sources, Vadra owns over 10,000 acres of land in the state today.

Only the state government – and the central government – knew that land around power sub-stations would be valuable once they announced plans incentivise solar power generation. So, logically, the state should have bought land first.

It did, but it did something peculiar. The Congress government in Rajasthan acquired 50,000 hectares of land for solar plants, but bypassed the wasteland near power sub-stations during the acquisition process. Solar plants situated close to sub-stations are most economical since this means you have to invest less in grid lines to evacuate the power.

Did Gehlot’s government know that Vadra was going to buy, or did Vadra know in advance that the state government was going to announce it solar policy well in advance? Firstpost sent a mail to Vadra to get his version of things, but at the time of writing he had failed to respond.

Vadra started creating a land bank near power sub-stations from June 2009. Barely eight months later, in February 2010, the Central Government announced the Jawaharlal Nehru National Solar Mission (NSM) Policy under which huge subsidies (nearly 40 percent) were offered for setting up grid-tied solar power plants.

Land in Bikaner where a solar plant is to be set up. Raman Kripal/ Firstpost

Land in Bikaner where a solar plant is to be set up. Raman Kripal/ Firstpost

Almost immediately, Vadra’s land located near power sub-stations soared in value. The land bought by the state government had practically no takers because most of it was not close enough for easy grid connections. The government is now mulling developing solar parks on this land by setting up elaborate evacuation systems. It will spend a pretty penny in doing so, while Vadra is sitting on crores of profits – and potential profits.

Not one of the 23 companies which obtained licences to set up grid-connected solar power plants under NSM opted for government land! This, despite the fact that the state government offered to lease out or allot the land at 10 percent of the market rate.

Now, stuck with land that no one wants, Rajasthan Energy Minister Jitender Singh says his government will build huge solar parks on the 50,000 hectares by setting up the necessary infrastructure.

For hundreds of private developers who have registered for solar plants in Rajasthan, land near a power sub-station is the top choice. This means they don’t have to bear the cost of putting up gridlines and related infrastructure to connect to transmission sub-stations. Not only that, by setting up solar projects next to sub-stations, the investor suffers minimum loss in transmission and distribution of power.

The state government’s land policy helped Vadra make crores because its own land policy involves only leasing the land, not selling it.

“This makes things more uncertain for a developer, because the government keeps changing and so does the solar policy,” a private developer requesting anonymity said.

For instance, on 24 February 2009, the Rajasthan government had issued a circular making it mandatory for solar power producers to supply a certain amount of free power to the state as they were getting vast amounts of land at throwaway rates. Moreover, the government shut “open” access for solar power plants built on the allotted government land. While private solar power developers who procured land on their own were free to sell power outside the state under the “open” access system, those opting to lease government land would have got stuck in case the state did not buy their power.

This circular did not make sense, and was overturned in the new solar policy of the state government in 2011. Under this policy, a private developer can take government land, but the land acquired by the government is 20-30 km away from the grid sub-stations.

The target in the first phase of NSM is 1,000 MW of grid-connected solar power projects by 2013. Jitender Singh says: “The decks have already been cleared for 820 mw of solar power. And over 800 private solar developers have registered with us.”

Vadra’s land is thus in huge demand for grid-tied solar projects. He is selling these `agricultural’ plots exclusively for solar plants. Since the state is promoting solar power, the rate for converting agricultural land to industrial use is lower than the normal rate prevailing in the state.

Pratap Raju, Joint Managing Director of PR Fonroche Pvt Ltd, who bought land from Vadra’s company Blue Breeze Trading Pvt Ltd and Sky Light Realty Pvt Ltd, says: “Bikaner did not have quite as high isolation as other parts of Rajasthan. It was still quite good. More importantly, this land we chose was 2 km from the sub-station, which meant evacuation costs would be less. Moreover, the sub-station was a 220 kv and brand new, which meant that we could expect quite high uptime/availability. So juggling these several variables – insolation, distance to sub-station, available capacity at the said sub-station – we found this land to be a top choice for us.”

PR Fonroche, a French joint venture, is developing two solar projects totalling 20 mw of power at Kolayat, about 15 km away from Bikaner. The company had signed a power purchase agreement in 2011 and it bought land in May 2012, just in time to launch the project on the targeted deadline.

The site of an upcoming solar plant in Bikaner. Raman Kripal/ Firstpost

The site of an upcoming solar plant in Bikaner. Raman Kripal/ Firstpost

So what kind of killing did Vadra make? Raju says that the price he paid was perhaps something like five times the price of land just three-four years ago.

“It is important to choose the right land at a good price, rather than lowest price, to make the project viable,” Raju told Firstpost.

In fact, Kolayat is attracting several other private developers. Greentech Power Pvt Ltd, Alex Spectrum Radiations (P) Ltd, RH Prasad & Company Pvt Ltd and Hasya Enterprises (P) Ltd.

It is not known if they too bought land from Vadra, but in Kolayat, Vadra’s companies own nearly 90 percent of the wasteland. They may have no choice.

Vadra began his real estate investments in Rajasthan in 2009, when the Central government had not yet announced its new solar policy. There was only a hint of it in Prime Minister Manmohan Singh’s statement (while launching India’s Action Plan on Climate Change on 30 June 2008), that in the new energy strategy, “the sun occupies center-stage, as it should, being literally the original source of all energy.”

“We will pool our scientific, technical and managerial talents, with sufficient financial resources, to develop solar energy as a source of abundant energy to power our economy and to transform the lives of our people. Our success in this endeavour will change the face of India. It would also enable India to help change the destinies of people around the world”, said the PM.

Well, one person whose financial destiny it changed was his party boss’s son-in-law.

Right from the beginning, it was clear that the Rajasthan government was sure to get the lead role in the new solar energy policy because it had perhaps the best solar radiation in India (6-7 kwh/sq m/day) and a vast pool of wasteland. Jodhpur district alone, a solar potential district, is bigger than Kerala.

To execute the policy, the Congress government in Rajasthan started creating a land bank in districts with solar potential. Surprisingly, land that was close to the grid was ignored during the acquisition.

And this is where Robert Vadra jumped in. In 2009, much before the grid-tied solar power generation policy was announced, he started buying wasteland near the sub-stations. Unsuspecting farmers, who live with the hope that their land, which is barren and of no use, will get acquired one day, suddenly found a messiah in Robert Vadra’s agent Mahesh Nagar, brother of Faridabad-based Congress leader Lalit Nagar.

Just 30 km outside Bikaner is a 220 kv grid sub-station located in Kolayat tehsil on National Highway 15. Between June 2009 and June 2010, 63 land deals were struck in Kolayat. And in all these deals, Mahesh Nagar is at the forefront, as an agent of Robert Vadra’s companies, Blue Breeze, Sky Light, North India IT Parks, Real Earth, etc.

A solar power plant in Bikaner, Rajasthan. The land was acquired from a firm owned by Vadra. Raman Kripal/ Firstpost

A solar power plant in Bikaner, Rajasthan. The land was acquired from a firm owned by Vadra. Raman Kripal/ Firstpost

In some deals, he represented other individuals, including Robert Vadra’s Private Secretary Manoj Arora, and his own brother Lalit Nagar, apart from some unknown companies. But Vadra’s pointperson Mahesh Nagar is the agent in all the deals.

Firstpost sent a detailed questionnaire to Robert Vadra and Manoj Arora, asking them specifically about these individuals and unknown companies. Vadra has not replied yet to our queries.

Over 2,200 hectares of land was bought in Kolayat on a war footing in one year. One hectare is equivalent to 3.95 acres. So nearly 8,800 acres of land, equivalent to one sector of Gurgaon, was sold off in Kolayat. This is the tip of the iceberg, because this information is based on investigations conducted near just one power sub-station only. There are nearly 30 power sub-stations in Rajasthan.

Here’s an indicator of the kind of profits Vadra could have made. A plot of 30 hectares costing Rs 4.45 lakh two years ago now fetches nearly Rs 2 crore!

Vadra’s Sky Light Realty Private Ltd bought this plot in Kolayat on 31 March 2010. Just two years later, on 4 May 2012 (according to a sale deed available with Firstpost), Sky Light sold off 29.36 hectares of land in Kolayat for nearly Rs 2 crore (Rs 1,99,58,121) to French joint Venture Fonroche Saaras Energy Pvt Ltd.

The land was as barren as it was with the farmer. Vadra’s company did not add any value to it. Blue Breeze and Sky Light together sold over 55 hectares of land to Fonroche.

Likewise, Vadra’s Sky Light Realty Pvt Ltd sold 3.25 hectares to one Rishipal, resident of Haryana, for Rs 22 lakh (Rs 7 lakh a hectare) on 11 May 2012. Interestingly, Rishipal sold this land to Fonroche seven days later on 18 May 2012.

BJP MP from Bikaner and former IAS officer Arjun Meghwal wondered why Robert Vadra had to invest in dead land in Bikaner. “One can understand Vadra investing in the Gurgaon realty sector, but why Bikaner of all the places,” asked Meghwal.

Well, he has his answer now. Bikaner is fast emerging to as the next solar hub in the country! And Robert Vadra made his hay in the sun.



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Ahmedabad: Solar Impulse,  the world’s only solar-powered aircraft, will make a stop over in Ahmedabad tomorrow as a part of its maiden global journey.

“Solar Impulse will take off from Abu Dhabi in the United Arab Emirates and land in Ahmedabad after making a first stop over at Muscat in Oman. It will make a pit-stop in Ahmedabad,” a release issued by the aircraft project’s PR firm said here.

After making a landing here, the solar-powered aircraft’s founders and pilots Bertrand Piccard and Andr? Borschberg are likely to stay in the city for two days before leaving for Varanasi in Uttar Pradesh, the release said.

The Swiss solar-powered aircraft’s flight got delayed by a day due to bad weather conditions in the UAE. The aircraft was scheduled to land in Ahmedabad today, but now it will make a stop over here tomorrow, it said.

Bertrand Piccard, one of the two Swiss pilots of the solar-powered plane Solar Impulse 2, takes off from the Emirati capital Abu Dhabi's small Al-Bateen airport during a third test flight. AFP

Bertrand Piccard, one of the two Swiss pilots of the solar-powered plane Solar Impulse 2, takes off from the Emirati capital Abu Dhabi’s small Al-Bateen airport during a third test flight. AFP

Piccard and Borschberg, during their stay in the city, will reach out to the government, NGOs, universities and schools to spread the message of clean technologies. The aircraft is also likely to hover above Ganga river in Varanasi to spread the message of cleanliness and clean energy, an official associated with the project said.

Solar Impulse is claimed to be the first aircraft to fly day and night without a drop of fuel, propelled solely by the sun’s energy, as per the project’s website.

The single-seater aircraft made of carbon fibre has a 72 metre wingspan, larger than that of Boeing-747 and weighs just 2,300 kg, equivalent to the weight of a car, it said.

The 17,248 solar cells built into the wing supply electric motors with renewable energy. The solar cells recharge four lithium polymer batteries totalling 633 kg each, which allow the aircraft to fly at night and therefore have virtually unlimited autonomy, it said.

This round-the-world flight will take-off from Abu Dhabi and make a halt at Muscat (Oman), Ahmedabad and Varanasi in India, Mandalay in Myanmar and Chongqing and Nanjing in China.

After crossing the Pacific Ocean via Hawaii, the aircraft will fly across the US stopping at Phoenix, the Midwest and New York City, said the website. The test flight of the aircraft was conducted in the US in 2013.

PTI



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STAT 202 ***In-Class Test*** Solar Energy in Different Weather. Voltage readings from a meter connected to a system was used to test the claim of equal voltage readings in different types of day. 1. The table below summarizes the results- Source DF Factor 2 6.9144 3.4572 38.04 0.0088 Error 15 1.3633 0.0909 Total 17 8.2778 MS S- 0.3015 R-Sq 83.53{0b7da518931e2dc7f5435818fa9adcc81ac764ac1dff918ce2cdfc05099e9974} R-Sq(adj ) :81.33{0b7da518931e2dc7f5435818fa9adcc81ac764ac1dff918ce2cdfc05099e9974} a- How many samples were used? b- What is the sample size of each sample? c- What is the F statistic? a- What is the critical value? e- If you compare the F statistic to the critical value, wi11 you reject or fail to reject the null hypothesis? Explain f- Identify the p-value g- What is the conclusion of this experiment? 2. A confidence interval for the proportion of people who support the legalization of marihuana for medical purposes was found to be 0.48±0.25. This confidence interval was constructed with a confidence level of 90{0b7da518931e2dc7f5435818fa9adcc81ac764ac1dff918ce2cdfc05099e9974}. What sample size did they use? 3. A simple random sample of 200 US citizen was taken to estimate the proportion of people who like soda. 135 responded they enjoy drinking soda. Construct a 98{0b7da518931e2dc7f5435818fa9adcc81ac764ac1dff918ce2cdfc05099e9974} confidence interval. Interpret the interval. 4. It is believed that the average age of American students entering college is 18.2 years. Some analysts think the age is lower and take a simple sample that the sample mean is 17.25 years with a standard deviation of 2.1 years. conduct a test to verify the analysts claim. of 49 students and find

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solar-bkgd-16×9-grey. Read more SEMTE News … School for the Engineering of Matter, Transport and Energy (SEMTE) PO Box 876106. Tempe, AZ …

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Sri Lanka’s first solar panel manufacturing plant with Japanese investment opens in Katunayake


Sat, Jul 21, 2018, 10:07 pm SL Time, ColomboPage News Desk, Sri Lanka.

July 21, Colombo: The Japanese Sri Lanka Friendship (JSF) Corporation, Sri Lanka’s first manufacturer of solar panels today commenced manufacturing operations at their production facility in Katunayake Export Processing Zone with the participation of Ambassador of Japan Kenichi Suganuma as the Chief Guest.

JSF Corporation (Pvt) Ltd, a wholly owned subsidiary of REK CO., Ltd. in Japan and registered as a BOI company in Sri Lanka, specializes in providing renewable energy systems for both home and industrial use, efficient use of energy and improves productivity through it.

The company at its plant in Katunayake, will be manufacturing solar panels, assembling inverters and LED lighting to cater to the domestic and export market under the brand of “Sakura Solar”.

Solar Panels and related equipment sold in Sri Lanka will carry a 35-year generation warranty. In addition, because components are locally manufactured they also would be cheaper.

The JSF Corporations will invest US$ 250 million in its operations and manufacturing process and provide over 250 employment opportunities. The investment would act as a source of support to the government’s Soorya Bala Sangramaya renewable energy program as well.

Speaking at the event, Japanese Ambassador Suganuma said Sri Lanka has come forward in all spheres during the past three years and noted that this is the first Japanese solar power project in Sri Lanka.

“This is just a start. We will support Sri Lanka’s economic growth facing future challenges. Friendship between Sri Lanka and Japan is a longstanding one. Under the present Government several economic activities between the two countries are in operation. We thank the present government of Sri Lanka for the opportunity given and we hope to invest further in Sri Lanka,” Ambassador Suganuma said.

Minister of Power and Renewable Energy Ranjith Siyambalapitiya and State Minister Ajith P. Perera also participated in the occasion.



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Every six to eight years, massive dust storms can envelop Mars’s whole surface. NASA’s Martian probes are currently watching one unfold over the Red Planet. Scientists saw a small-scale dust storm begin on May 30th, and by June 20th, it’d gone “global,” engulfing the whole planet. For the NASA Opportunity rover, visibility dropped from that of a sunny day to an overcast one. Because the rover runs on solar energy, researchers suspended it to preserve its batteries. According to NASA, it could take as long as September before the dust starts to settle, and the Opportunity starts reporting back.

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Meanwhile, numerous other Mars orbiters are helping scientists understand the dust storm. “This is one of the largest weather events that we’ve seen on Mars,” since spacecraft observations began in the 1960s, said Michael Smith, a scientist at NASA’s Goddard Spaceflight Center. Smith and other scientists are trying to understand how small, regional storms swarm to become such a large one. They’re also recording how the dust storm changes the planet’s atmospheric temperatures, which can change winds, which in turn can amplify the storm by stirring up more dust from the planet’s surface. “The very fact that you can start with something that’s a local storm, no bigger than a small [US] state, and then trigger something that raises more dust and produces a haze that covers almost the entire planet is remarkable,” said Rich Zurek, the project scientist for MRO, which maps the evolution of the storm daily in color images and atmospheric temperature.

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Meanwhile, the Mars Curiosity is on a mission to acquire rock samples and study the storm from the surface of Mars itself, and another orbiter is studying Mars’ high atmosphere, 100 kilometers above the surface, where the dust doesn’t reach. Every time you see Mars in the sky in the weeks ahead, NASA advises, “remember how much data scientists are gathering to better understand the mysterious weather of the Red Planet.”

(via NASA)

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A large, international team of researchers has drawn up rules for creating efficient organic solar cells. Organic solar cells, which are made of carbon-based materials, have some unique advantages over other solar cell technologies. The research team included twenty-five scientists from seven research institutes in Europe, China, and the US. Feng Gao, associate professor at Linköping University, Sweden, led the research.

It is possible to manufacture organic solar cells through printing technologies. We cannot do this, however, with other solar cell technologies. Printing is a relatively low-cost way of manufacturing solar cells.

It is also possible to make organic solar cells in specific colors. They are therefore easier to use architecturally in building integration.

Their flexibility makes them ideal for powering the sensors for the ‘internet of things.’ Also, their low weight makes things much easier.

Prof Feng Gao - Building efficient organic solar cells
Organic solar cells had a major problem – energy loss. Scientists, however, say they have overcome this problem. (Image: adapted from https://liu.se)

Organic solar cells – energy losses

The main challenge in organic solar cell development is energy loss, which is typically large.

Prof. Gao, who works at Linköping University’s Division of Biomolecular and Organic Electronics, said:

We have formulated some rational design rules to minimize energy losses in organic solar cells. Following these rules, we present a range of examples with low energy losses and high-power conversion efficiencies.”

Prof. Gao and colleagues wrote about their research in the prestigious journal Nature Materials (citation below).

Organic solar cells – power conversion efficiency

Using the researcher’s design rules, organic solar cells can catch up with their rivals regarding power conversion efficiency.

Power conversion efficiency measures the fraction of energy in solar radiation that converts to electricity. In other words, the proportion of solar radiation in light that turns into electricity.

In theory, it is not possible to convert more than 33{0b7da518931e2dc7f5435818fa9adcc81ac764ac1dff918ce2cdfc05099e9974} of the sun’s energy into electricity. However, we are still far from hitting that limit.

Laboratory experiments using silicon-based solar cells have managed to convert 25{0b7da518931e2dc7f5435818fa9adcc81ac764ac1dff918ce2cdfc05099e9974} of solar radiation into electricity.

Scientists believed that the limit for organic solar cells was much lower. Much lower, that is, until now.

Regarding the theoretical limit for solar cells, co-author, Prof. Olle Inganas, said:

“But we now know that there is no difference – the theoretical limit is the same for solar cells manufactured from silicon, perovskites or polymer.”

Prof. Inganas is Professor of Biomolecular and Organic Electronics at Linköping University.

Solar power – the process

When the semiconducting polymer in a solar cell absorbs photons from the Sun, electrons in the donor material are raised to an excited state.

Holes subsequently emerge in the ground state to which the electrons are attracted. It is necessary to add an acceptor material to separate these electrons. The acceptor material, however, results in additional energy loss.

This energy loss has been a major challenge for the organic cell community for more than twenty years.

In the journal, the authors present two fundamental rules to reduce energy losses for efficient organic solar cells:

– Minimize the energy offset between the acceptor components and donor.

– Ensure that the blend’s low-gap component has high photoluminescence. In other words, that light emission after photon absorption is high.

The research team has produced about twelve different materials. We had already known about some of them. Others, on the other hand, are completely new.

According to Eurekalert.org:

They have used these to demonstrate that the new theory agrees with experimental results, even though it is somewhat incompatible with what was previously believed.”

Citation:

“Design rules for minimizing voltage losses in high-efficiency organic solar cells,” Deping Qian, Zilong Zheng, Huifeng Yao, Wolfgang Tress, Thomas R. Hopper, Shula Chen, Sunsun Li, Jing Liu, Shangshang Chen, Jiangbin Zhang, Xiao-Ke Liu, Bowei Gao, Liangqi Ouyang, Yingzhi Jin, Galia Pozina, Irina A. Buyanova, Weimin M. Chen, Olle Inganäs, Veaceslav Coropceanu, Jean-Luc Bredas, He Yan, Jianhui Hou, Fengling Zhang, Artem A. Bakulin & Feng Gao. Nature Materials, 16 July 2018. https://doi.org/10.1038/s41563-018-0128-z.

Last week, a team of researchers from Rutgers University-New Brunswick explained how gold nanoparticles can improve solar energy storage.

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