Cloaking Principle Could Boost Solar Cell Performance

Invisibility cloaking may be a long way from reality, but the principle could help improve the performance of solar cells in the near term.  In a series of simulations, researchers at the Karlsruhe Institute of Technology have demonstrated how cloaks made of metamaterials or freeform surfaces could eliminate shadows cast by energy-harvesting components onto the active surfaces of solar cells.  Contact fingers, which extract electric current, cover up to one-tenth of the surface area of a solar cell. By guiding light around these features, more of the sun's energy could be captured by the solar cell.  "Our model experiments have shown that the cloak layer makes the contact fingers nearly completely invisible," said doctoral student Martin Schumann.   Cont'd...  

Germany & China Lead in Solar Installed Capacities

Germany's top place in the ranking is not surprising given its Energiewende focus to transition away from fossil fuels & its declared war on coal.

Molten Salt Energy Storage - Time to Bottle the Sun

A total of about 2,125 MW of molten salt energy storage projects are in pipeline which are scheduled for deployment by 2018.

SolarCity claims highest efficiency solar panel

Tristan Edist for the Business Spectator:  SolarCity, the largest retailer of solar systems in the US (over 30% market share) and partly owned by Tesla’s Elon Musk, has announced it will produce the most efficient solar module available on the market at 22.04% conversion efficiency. SolarCity is claiming it has therefore managed to pip SunPower who have been the longstanding holder of the most efficient conventional silicon solar module on the market. However in a subsequent discussion with Greentech Media, Peter Rive’s Chief Technology Officer conceded the majority of the panels coming off its pilot 100MW manufacturing line were hitting 21.8%.  In 2017 the company will be then moving production to a new 1 gigawatt per annum capacity plant in Buffalo which can sometimes encounter challenges with achieving stable quality levels during production start-up. SunPower claims 21.5% efficiency for its X-Series panel although often manufacturers will  have some variance in performance of panels and make claims based on conservative estimates of performance. Greentech Media quotes an anonymous Sunpower source saying that 22% efficient panels are already coming off its production lines.  In addition the company is targeting achieving 23% conversion efficiency from panels it will manufacture from its fifth fabrication line, scheduled for start-up in 2017.     Cont'd...

Renewable Energy Surpasses Coal in the UK

Written by Keith Kohl for Energy & Capital:  For the first time ever, more energy in the UK was supplied by renewable sources than coal. For an entire quarter. Wind, solar, and bioenergy checked in at 25% of the energy supplied. All of this was possible due to the fact that more wind turbines and solar panels were installed, which must be a good amount if you want to compare it to the same period last year, for which these energy options only accounted for 16.4% of electricity. Recently, the UK has been working to close aging coal and nuclear power plants. Of course, this will lead to its own issues... [Solar Panels] Conservative ministers collectively believe that the subsidies given to renewable energy were too numerous, going so far as to suggest plans for an 87% reduction of solar power, and to cut support for onshore wind farms. With that kind of spending cut, it's not surprising to hear that industry execs believe these actions would unjustly put an end to renewable energy just as it was gaining traction.   Cont'd...

Can the U.S. Jump-Start Offshore Wind Power?

By Camille von Kaenel and ClimateWire:  The Department of Energy has awarded around a half-million dollars to New York, Maine, Rhode Island and Massachusetts state organizations to cooperate on scaling up the offshore wind industry in the region.  Under the leadership of the New York State Energy Research and Development Authority (NYSERDA), the group will lay out a collaborative road map by the end of the year on how to build up the new industry. The project largely aims to reduce the cost of offshore wind projects, which has been a barrier to development, and establish a regional supply chain.  Industry and state representatives learned about the federal grant at the first-ever offshore wind summit hosted by the White House yesterday.  Offshore wind has struggled to take off in the United States. Europe, meanwhile, has more than 80 offshore wind farms with more than 10,000 megawatts of capacity. The White House summit marks a renewed effort to get the industry going in the United States, said various attendees.   Cont'd...

Five More Myths About Solar Energy - And The Real Facts

In an earlier article, Midsummer's CEO Sven Lindström outlined some of the most common myths about solar power. Here are five more of the most common solar energy myths - coupled with the real facts.

Researchers develop cool way to improve solar cell efficiency

By Kelly Hodgkins for Digital Trends:    A team of engineers from Stanford University have invented a cool way to improve the performance of solar panel arrays. A new material that the team produced literally will lower the temperature of solar cells even while they are operating in full-strength sunlight. As the solar cells cool, their efficiency will rise, leading to significant gains in the amount of energy harvested from the sun. Solar panel technology has improved by leaps and bounds, but the technology has a flaw that limits the efficiency of the system. The panels must face the sun to operate, but the heat from this exposure diminishes their ability to convert light into energy. The hotter they get, the less efficient they become. This issue has perplexed the industry for years, but the Stanford team may have discovered a material that can help dissipate this excess heat without affecting the operation of the solar array. The solution, proposed by Stanford electrical engineering professor Shanhui Fan, research associate Aaswath P. Raman, and doctoral candidate Linxiao Zhu, uses a material that is able to capture and emit thermal radiation (heat) away from the solar call. While deterring heat buildup, the thin, patterned silica material does not block sunlight, allowing the photons to enter the solar panel where they are converted to energy. It’s a win-win situation, allowing the free flow of sunlight and the removal of excess heat from the system.   Cont'd...

Evaluating the Case for Module-Level Shutdown

An Increase in Safety or the Creation of Perceived Danger?

IoT and Solar Energy

Because solar installations can operate anywhere there is cellular service available, AT&T is a perfect technology provider for the wireless connectivity needs of solar companies.

Shunfeng Arrives With a Strong Commitment To The US Market

Our energy cost saving solution will have a very positive effect on the US economy as it will enable building owners to redeploy money they save to hire or retain more people or invest in equipment, and grow their businesses.

Wind turbine technology stores excess wind power for when gusts turn to breezes

Megan Treacy for TreeHugger:  A new technology developed by University of Nebraska-Lincoln electrical engineering doctoral student Jie Cheng solves both of those problems by harnessing the excess wind energy usually wasted as spillage and storing it for use when wind speeds dip, making wind turbines more efficient and consistent. Cheng's system converts and directs the extra wind energy to an air compression tank, where the energy is stored until wind speeds dip below the maximum capacity. Using a rotary vane machine that is connected between the turbine's gearbox and generator, excess energy is diverted and stored in the air compression tank. When the wind dies down, the tank then kicks in and reverses airflow back to the rotary vane machine to generate electricity. In a recent study of his prototype, Cheng found that a 250-kW system would produce an additional 3,830 kWh of electricity per week or an additional 16,400 kWh per month based on historical wind data from Springview, Nebraska. That extra electricity is about 18 times the monthly energy use of a typical American household.   Cont'd...

Global solar photovoltaic manufacturing production slows in recent years

The market is reacting to the slow growth of module production and the decreased utilization of PV manufacturing capability by downsizing and consolidating PV manufacturing companies.

El Niño Buffers U.S. Wind Power Dreams

Tim Maverick for Wall Street Daily:  The National Oceanic and Atmospheric Administration (NOAA) made it official last week. The current El Niño is classified as a strong event. An El Niño falls into the “strong” category if weekly sea surface temperatures depart from the average by more than two degrees Celsius. In fact, this El Niño has nudged ahead of the 1997 El Niño as the strongest in the modern era! Meteorologists believe this occurrence is actually the most potent since 1948. And it’s expected to persist through winter and into spring. Every El Niño’s effects are different. At the moment, this one is having a surprisingly negative effect on the wind power industryin the United States. You see, this occurrence of El Niño has produced the weakest winds across the United States in 40 years. Forecasters say this situation will continue and may even worsen through the spring of 2016.  Cont'd...

SPI 2015: Tax credit sunset preoccupies a fast-maturing industry

By Herman K. Trabish  for UtilityDIVE:  Solar photovoltaic (PV) installed capacity is expected to reach 7.7 GW in 2015, up 24% from 2014, according to the Solar Energy Industries Association (SEIA) and GTM Research. From July 2015 to December 2016, the report forecasts the U.S. solar PV marketwill add 18 GW, which is more than the cumulative capacity built by the industry up to the middle of 2014. But there are some headwinds for the sector. In a sign it has reached a level of maturity achieved recently by the wind industry, solar advocates now face an uphill political battle for the industry's most vital federal incentive The mandated term of solar's vital 30% federal investment tax credit (ITC), in place continuously since 2008, will end on December 31, 2016. Beyond that deadline, the tax credit provided at the end of a project’s first year of operation will fall to 10% for commercial investments in solar and to zero for residential solar investments. SEIA is mounting a multi-million dollar lobbying campaign to secure a five-year extension that will get the industry to 2020, when it hopes the Clean Power Plan can take over to help boost growth.  Cont'd...

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