Tuesday, 14 June 2016

This solar-powered self-driving boat is making a historic journey across the Atlantic Ocean

Somewhere in the Atlantic Ocean, a small autonomous boat is braving wind and waves to demonstrate the power of solar energy. Isaac Penny and Christopher Sam Soon’s Solar Voyager embarked from Boston on June 1, and they hope it will land in Portugal in October.



 Sam Soon and Penny, both engineers, began the project in 2013, with the goal of building aboat from scratch that could travel the world on its own. They aren’t the first to send an autonomous craft to sail the ocean – a 2012 Wave Glider that made the trip was powered by wave energy and financed by the company Liquid Robotics.
The engineers aren’t funded by a major company, and they built the boat themselves. Penny and Sam Soon worked on their Solar Voyager in their spare time after work. According to Penny, anyone can build a craft like they did.
The photovoltaic panels that power the Solar Voyager can generate 7 kilowatt hours (kWh) every day in the summer and 3 kWh in the winter. The boat is made from aluminum, which the engineers decided would be more resilient than the “glass reinforced plastic” used by other autonomous boats. The aluminum makes the Solar Voyager heavier and slower, but will help it resist shocks. The engineers monitor the boat through the Iridium satellite network, and can receive updated data every 15 minutes.
Penny said to TechCrunch, “We always think about solar as this alternative energy thing, but you just couldn’t do this with fossil fuels – you couldn’t build something that will run forever. Whether it’s long endurance drones, or data gathering for maritime security, or monitoring wildlife preserves – solar isn’t just an alternative form of energy, it’s the best solution. It brings something to the table that nothing else has.”
You can keep up with the Solar Voyager and see where it is in the Atlantic here. The engineers are also looking for a boat owner in Portugal who can help them collect the Solar Voyager once it makes its journey.

Tuesday, 7 June 2016

Chile is generating so much solar power that it’s giving it away for free



In recent years, Chile has invested so much in its solar power industry that the country is now generating more electricity from the sun than it knows what to do with. A new report reveals that spot prices on solar electricity dropped to zero for 113 days of the year through April, and many more days of free solar power are expected to come. Taking advantage of free solar power is a huge benefit for residents, but analysts are concerned about how this will impact the market, since investors and owners of solar power plants may lose money.


Solar power fed to Chile’s central grid has quadrupled in capacity since 2013. The grid is now fed by 29 solar farms, and another 15 are planned for construction in the future. But Chile has two power networks in play: a central grid and a northern grid, which are not connected. Infrastructure in some areas of each grid is poor, so there are places where the grids simply cannot transmit as much electricity. Due to the age-old principle of supply and demand, some areas have more electricity than they need, driving prices down, while other areas are under-served. In areas served by the northern part of the central grid, power surpluses have driven the price to zero, and this year’s figures are on target to meet or exceed last year’s number of free solar power days, which was 192. Simultaneously, areas under-served by the grid are experiencing higher than normal prices.
Critics are concerned about the long-term effects of the massive solar industry growth, without the necessary infrastructure updates to handle the increased capacity. As Carlos Barria, former chief of the government’s renewable energy division and a professor at Pontifical Catholic University of Chile, in Santiago, told Bloomberg: “[President] Michelle Bachelet’s government has set the energy sector as a priority,” said Carlos Finat, president of the country’s renewable association, known as Acera. “But planning has been focused in the short term when it is necessary to have long term plans to solve these type of issues.”

Monday, 30 May 2016

Wilson Solar Grill Stores the Sun’s Energy for Nighttime Fuel-Free Grilling


Many of us will be firing up our grills this weekend for some well-deserved barbecue time. After all, barbecuing is one of America’s greatest pastimes, but it certainly isn’t one of our most environmentally friendly. Whether you prefer charcoal, wood chips or propane, grilling releases emissions and contributes to poor air quality. Up until now, solar powered grilling has required, as you might expect, the sun, which means traditional fuel-fired grills are required after sunset. But new solar technology developed by MIT professor David Wilson could bring a nighttime solar-powered grill to the market very soon; an invention also of great benefit to those in developing nations who rely on wood to cook all their food.



Wilson’s technology harnesses the sun and stores latent heat to allow cooking times for up to an amazing twenty five hours at temperatures above 450 degrees Fahrenheit. The technology uses a Fresnel lens to harness the sun’s energy to melt down a container of Lithium Nitrate. The Lithium Nitrate acts as a battery storing thermal energy for 25 hours at a time. The heat is then released as convection for outdoor cooking.
“There are a lot of solar cookers out there,” says Wilson, “but surprisingly not many using latent-heat storage as an attribute to cook the food.” Wilson developed the idea after spending time in Nigeria, where wood is used for cooking, which causes a number of problems. Not only is cooking with firewood leading to respiratory illnesses, but is also increasing the rate of deforestation and women are being raped while searching for wood.
A group of MIT students are working with the technology to develop a prototype solar grill. Derek Ham, Eric Uva, and Theodora Vardouli are conducting a study through their multi-disciplinary course “iTeams,” short for “Innovation Teams”, to determine the interest in such a concept and then hopefully launch a business to manufacture and distribute these grills. The goal is to develop a business model for distributing solar grills to developing nations as well as a grill for the American market. The American version is expected to be a hybrid propane/solar model that will allow for flame cooking as well as through thermal convection. 

Solar-powered floating home in Portugal generates a year’s worth of energy in just six months

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Friday offers four different models for Floatwing, each providing different levels of autonomy depending on the type of installed equipment. The best-outfitted Floatwing is for off-grid applications and relies on solar energy, a wastewater treatment plant with advanced tertiary treatment, a mini supply water treatment plant, and stored fuel to achieve self sufficiency. In addition to renewable technologies, Floatwing’s carbon footprint is further reduced through the use of “low environmentally impactful materials.”
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The Floatwing is made up of two levels: the long floating deck and the accessible upper deck that doubles as a roof. The glass-clad daylit living area is lined with wood and includes a fully equipped kitchen, heat pump, AC generator, barbecue on the upper terrace, a wine cellar, and zero to three bedrooms depending on the model selected. The windows can be opened in the summer for natural ventilation, while a pellet stove keeps the space warm and toasty in winter.
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While the structure has a six-meter-long fixed width, the house can be customized from 10 meters to 18 meters in length. The modular Floatwing neatly packs up into two standard shipping containers and can be shipped to almost anywhere in the world. Two small outboard motors let users steer the floating home across the waters at a moderate speed of three knots (approximately three miles per hour).
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“For six months of the year, between April and September, the floating house does not need any kind of refuelling or maintenance,” writes Friday. “This period of autonomy can be extended to one year with just some stored fuel and bags of pellets.”

Thursday, 26 May 2016

Japan’s New Energy Rules Could Make It a Paradise for Renewables

JAPAN IS A weird place. But not for any of the reasons you’re thinking. I’m talking in terms of energy, because among industrialized, consumer-ized, electronically-driven nations, Japan probably has the world’s worst portfolio of homegrown energy resources—it’s the second largest net importer of fossil fuels. But it gets weirder. This month, the island nation rewrote its energy rules to give consumers the power to choose which energy source it wants.

Before Fukushima, Japan got 30 percent of its power from nuclear energy. That would be significant even in a country with abundant natural resources. In lieu of coaxing a gas-filled meteor to fall into its lap, the Japanese government is hoping to use market forces to generate innovation in the energy sector. See, if electricity buyers get to buy from the lowest bidder, then those bidders will have to compete for ever-lower prices. Which doesn’t just mean lower prices for consumers: It could result in a boom for renewables.
First, a quick primer on how you get electricity. The stuff begins at the generator—a coal plant, hydroelectric dam, warehouse full of hotwired hamster wheels, whatever—and then enters transmission lines. Those electrons then go into local lines, pass through your meter ($$$), and finally get converted by your computer into the webpage displaying this article.
Traditionally, this whole process was operated by so-called vertically-integrated energy providers. They own the plants, they own the lines, they send you the bill. The price of electricity gets set by regulators, who base them on a company’s operating costs. “There is a downside, and that is a monopoly doesn’t allow for much competition and therefore it doesn’t allow for innovation,” says Mark Friedgan, chief information officer of Chicago-based Eligo Energy.
But Japan needs innovation to make up for the electrical capacity it lost when it switched off its nuclear power plants. Otherwise, the country keeps buying fossil fuels (mostly natural gas) from abroad. In a perfectly deregulated market, anybody can build a power plant, the transmission lines are free for all, and consumers can pick and choose who they want to buy from. That means stiff competition between energy providers to develop cheaper energy sources.
Obviously, that’s a boon for Japan. For a long time in the country, only 10 state-sanctioned monopolies were allowed to build power generating plants. Recently, however, the nation started allowing anybody (with the money and permits) build a power plant.
This works out great for small towns, which can build suitably sized solar, hydroelectric, or wind plants and set up their own municipal utility company. When the renewables can’t keep the lights on, they can buy from the old established utilities.
But there’s a huge wrinkle in Japan’s energy deregulation that could make it difficult for independent energy providers to build new energy projects at a larger scale. “The old regional monopolies that traditionally owned the power plants still get to set rates on the transmission lines,” says Steve Cicala, an energy economist from the University of Chicago. “That will hurt any incentive for people looking to build new renewable energy capacity.”
Think of it this way: Once they are built, renewables generate energy basically for free. As long as the wind is blowing, the sun is shining, and the rivers are flowing, renewables are cheaper than any other form of electricity. And with open transmission lines, those renewables can sell anywhere. “If you don’t have demand where the wind is blowing, you have to sell it through the transmission lines,” says Cicala. If putting your cleanly-produced electrons through those lines has a significant enough cost, then energy from a cheaper competitor using dirty fossil fuels might look more attractive to the frugal and now-empowered customer base. A not-so-free market after all.
This is a problem in some parts of the US as well, which has a jigsaw of regulatory policies. Many states let customers choose their energy supplier, but still allow big power companies charge tariffs on their transmission lines. Other places, like Texas, have a more laissez-faire system.
Energy regulation battles have been going on in US politics for decades. And it’s not just a war between monopolies and the free market. Some groups on the free market side favor state-based deregulation, while others argue for a single, nationwide model. In either case, a lot can go wrong. In a deregulated market, where energy sources are competing to be cheapest, the best way to turn a buck is by turning your generators off, thereby increasing demand (and price) for the electricity coming out of your other power plants.
“Anyone who makes the blanket statement that you should liberalize the electricity markets without including caveats about rules of market and diligent monitors needs to remember what happened in California,” says Cicala. In the early 1990s, in California’s recently deregulated energy market, Enron (remember Enron?) reaped massive profits, and created huge rolling blackouts, by strategically throttling their generative capacity.
Deregulation by itself doesn’t push renewable energy. For a real revolution, a government would need to include incentives, like tax credits (or maybe just level the playing field by eliminating tax breaks and subsidies enjoyed by the fossil fuel industry). And of course, Japan’s move isn’t really about getting greener, but more about saving yen—by developing a diverse, competitive, homegrown energy market. Which isn’t so weird, if you think about it.

Tuesday, 24 May 2016

A Huge Solar Plant Caught on Fire

A Huge Solar Plant Caught on Fire, and That’s the Least of Its Problems



IVANPAH, THE WORLD’S largest solar plant, is a glittering sea of mirrors, concentrating sunlight into three glowing towers. It is a futuristic vision rising out of the Mojave desert. But from the day the plant opened for business in 2014, critics have said the technology at Ivanpah is outdated and too finicky to maintain.
The latest problem? A fire at one of the plant’s three towers on Thursday, which left metal pipes scorched and melted. As the plant dealt with engineering hiccups, Ivanpah initially struggled to fulfill its electricity contract, and it would have had to shut down if the California Public Utilities Commission didn’t throw it a bone this past March. “Ivanpah has been such a mess,” says Adam Schultz, program manager at the UC Davis Energy Institute and former analyst for the CPUC. “If [the fire] knocks them offline, it’s going to further dig them in.” On top of the technical challenges, the plant has had to deal with PR headaches like reports of scorched birds and blinded pilots from its mirrors.
Ivanpah’s biggest problem, though, is hard economics. When the plant was just a proposal in 2007, the cost of electricity made using Ivanpah’s concentrated solar power was roughly the same as that from photovoltaic solar panels. Since then, the cost of electricity from photovoltaic solar panels has plummeted to 6 cents per kilowatt-hour (compared to 15 to 20 cents for concentrated solar power) as materials have gotten cheaper. “You’re not going to see the same thing with concentrated solar power plants because it’s mostly just a big steel and glass project,” says Schultz. It can only get so much cheaper.
Photovoltaic solar systems also have the advantage of scaling up or down easily. You can have one panel on your roof or the airport can have 100, and electricity can be made where it’s used. But for concentrated solar power plants, you need a huge tract of empty land. Ivanpah has 173,500 garage door-sized sets of mirrors spread over 3,500 acres. Each mirror has a motor controlled by a computer, which angles the reflective surface to track the location of the sun.
All those moving parts make Ivanpah more challenging to maintain than static solar panels. There’s the 173,500 sets of moving mirrors, and then there’s also the towers, where the concentrated sunlight superheats steam to generate electricity—each with their complicated plumbing systems. “The sheer size of these plants make it easy to overlook one little flaw,” says Tyler Ogden, an analyst at Lux Research. The fire department suggested the fire on Thursday was the result of misaligned mirrors that concentrated their death ray on the wrong part of the tower. David Knox, a spokesperson for Ivanpah’s operator, NRG Energy, said it was still too early to tell the cause of the fire. “We are assessing the damage and developing a repair plan,” says Knox.
Theoretically, concentrated solar power’s advantage is its ability to smooth out energy production. Solar panels produce energy when the sun is shining, and they’re basically roof decorations when they’re not. At Ivanpah, the water in the towers take time to get to electricity-producing temperatures in the morning, but the towers can continue to produce electricity into the early evening—when electricity consumption is coming off its peak. Plants elsewhere, like Crescent Dunes Solar Energy Project in Nevada, have mirrors that concentrate energy into tanks of molten salt instead of water, which can store the energy much longer.
In the US, for now, photovoltaic power is winning out. No one is looking to build more concentrated solar power plants here. But a huge concentrated solar power plant is going up in Morocco, and smaller scale installations in the US have used a curved mirror configuration to generate heat but not electricity. Knox says there may yet be uses for concentrated solar power, and the lessons learned at Ivanpah will chart the path forward. That’s unless those lessons end up being cautionary ones.
Link : http://www.wired.com/2016/05/huge-solar-plant-caught-fire-thats-least-problems/

Monday, 23 May 2016

With Solar Power, A Gujarat Village Is Irrigating Its Fields For Free

                                                              
                                                             

HIGHLIGHTS

  1. Farmers formed cooperative toinstall solar panels in their fields
  2. Solar panels power irrigation, surplus power sold to electricity board
  3. Project funded by farmers and non-profit group IWMI
Ramabhai Sagar, a 46-year-old farmer in Gujarat's Dhundi village, is experiencing first hand a solar revolution of sorts.

Around seven months ago, about a dozen farmers in Ramabhai's village about 90 km from Ahmedabad came together to form a solar cooperative and set up solar panels in the fields to generate electricity.

"We used to spend 500 rupees on diesel for pumping sets for drawing water for irrigation. But now we do it with solar energy," Rambhai said.

"We also make money by selling solar power when we not irrigating our fields. We can sell excess electricity to the power board for Rs. 4.63 per unit," he added.

While the farmers shelled out 10 per cent of the Rs. 60 lakh that it cost for the project, the rest was funded by non-profit organisation International Water Management Institute or IWMI.
 
The farmers sell the surplus power to the electricity board.
"We convinced the farmers about the benefits of solar energy - that we could irrigate our fields free of cost with it," said Secretary of the Dhuni Solar Cooperative, Pravin Parmar.

The cooperative also signed an agreement with a government-run power distribution company to sell excess electricity. Even while the project develops, farmers can earn up to Rs.4,500 per month by selling solar power.

Neha Durga, a consultant at IWMI said, "The system also incentivises farmers to increase the productivity of water and use less of it - so that they can sell the extra power - thus conserving ground water."

The villagers now say they want to see the experiment replicated in other parts of the state.