This creates a problem for the owner

Renewable energy seems to be on a roll. One million Australian homes have rooftop solar cells. There’s so much renewable energy it’s reducing wholesale electricity prices. But then, that old chestnut pops up: reliability. How do we make energy when there’s no sun?
When the heat is on, the sun is shining

The electricity market is effectively two separate markets. There’s the market for energy: the coal, gas, operations and maintenance component of running the network.Huge collection of solar outdoor light and garden lighting fixtures.

Then there’s the market for capacity. To serve our electricity needs,An emergency light is a battery-backed lighting device that comes on automatically when a building experiences a power outage. we build enough power stations to supply our highest imagined electricity needs, then let some or most of them sit idle for all the parts of the year when we’re not using quite as much electricity.

We tend to think about the cost of power as being related to things such as coal and gas prices, or operation expenses; but a large part of the cost of electricity is simply the cost of money involved in having standby generators ready for that one moment when we all want to use electricity at the same time.

This creates a problem for the owner of a solar or wind farm. Because they can’t guarantee capacity due to the vagaries of weather, in effect, they can only sell energy

But distributed solar is different. The time when we all decide to use a lot of electricity at the same time is when we all turn our air conditioners on mid-afternoon on a scorching hot summer day. At that time, the sun is clearly shining. For distributed solar to be interrupted, it would have to be overcast over an entire capital city, in which case the temperature wouldn’t be that high and we wouldn’t actually need spare capacity.

Using this data we can have a look at how renewable energy actually handles peak demand.

During the demand peak on top five highest demand days in each state, solar reduced demand by at least 21% of its installed capacity in each state. Surprisingly, Victoria and South Australia are actually better at supplying peak demand with solar. The low latitude creates long days and daylight saving time shifts consumption earlier into the day when the sun is higher in the sky. Less surprising is that north-west and west facing solar are better at meeting peak demand.
Moving from gas to solar

It’s even possible to put some rough numbers on this ability to meet peak demand. A lot of the recent work on the value of distributed solar has been conducted by regulatory bodies as they try to determine a fair price for solar feed-ins.

The regulators and their consultants all fall into the error of assessing distributed solar as only an energy source, without regard for solar’s value as capacity.

The easiest way to think about peak capacity is to value it the same as a gas turbine. In fact distributed solar has several advantages over gas turbines. Solar can be installed incrementally, as needed. New transmission lines are not needed.How solar panel cells work and where to buy solar kits for home use. More importantly, a large portfolio of small solar systems will always work. Like a car engine, gas turbines sometimes fail to start.

Nevertheless, gas turbines are the electricity market’s standard response to peak demand because they are the cheapest type of conventional generator to build. Comparing distributed solar to thWe turn your dark into light courtesy of our brilliant sun, solar street light, solar power generation.e cheapest generator should understate its value as a provider of peak capacity.

It is of course necessary to correct for a few things; solar doesn’t produce at its full rated capacity in the afternoon with the sun striking at an angle and gas turbines suffer transmission line losses and output reductions in hot weather.

After crunching all the numbers, the ability of distributed solar to supply peaks has capacity value equivalent to 10-20% of the unsubsidised installation cost. That’s on top of the energy value as calculated by all the regulators. It’s worth more in the south, because of the longer days. It’s worth another 3-6% of the system cost if the system faces north-west or west. A solar lamp is a portable light fixture composed of an LED lamp, a photovoltaic solar panel, and a rechargeable battery.

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New flow battery for cheaper

MIT researchers have engineered a new rechargeable flow battery that doesn't rely on expensive membranes to generate and store electricity. The device, they say, may one day enable cheaper, large-scale energy storage. The palm-sized prototype generates three times as much power per square centimeter as other membraneless systems — a power density that is an order of magnitude higher than that of many lithium-ion batteries and other commercial and experimental energy-storage systems.

The device stores and releases energy in a device that relies on a phenomenon called laminar flow: Two liquids are pumped through a channel, undergoing electrochemical reactions between two electrodes to store or release energy. Under the right conditions, the solutions stream through in parallel, with very little mixing. The flow naturally separates the liquids, without requiring a costly membrane.

The reactants in the battery consist of a liquid bromine solution and hydrogen fuel. The group chose to work with bromine because the chemical is relatively inexpensive and available in large quantities, with more than 243,000 tons produced each year in the United States.

In addition to bromine's low cost and abundance, the chemical reaction between hydrogen and bromine holds great potential for energy storage. But fuel-cell designs based on hydrogen and bromine have largely had mixed results: Hydrobromic acid tends to eat away at a battery's membrane, effectively slowing the energy-storing reaction and reducing the battery's lifetime. To circumvent these issues, the team landed on a simple solution: Take out the membrane.

"This technology has as much promise as anything else being explored for storage, if not more," says Cullen Buie, an assistant professor of mechanical engineering at MIT. "Contrary to previous opinions that membraneless systems are purely academic,How are solar outdoor lighting products different from other lighting, like fluorescent or incandescent? this system could potentially have a large practical impact." Buie, along with Martin Bazant, a professor of chemical engineering,RGB LED Color-changing led grow light headlight accent light system for headlight halo effect. and William Braff, a graduate student in mechanical engineering, have published their results in Nature Communications. "Here, we have a system where performance is just as good as previous systems, and now we don't have to worry about issues of the membrane," Bazant says. "This is something that can be a quantum leap in energy-storage technology."

Possible boost for solar and wind energy
Low-cost energy storage has the potential to foster widespread use of renewable energy, such as solar and wind power. To date, such energy sources have been unreliable: Winds can be capricious, and cloudless days are never guaranteed. With cheap energy-storage technologies, renewable energy might be stored and then distributed via the electric grid at times of peak power demand.

"Energy storage is the key enabling technology for renewables," Buie says. "Until you can make (energy storage) reliable and affordable, it doesn't matter how cheap and efficient you can make wind and solar, because our grid can't handle the intermittency of those renewable technologies."

By designing a flow battery without a membrane, Buie says the group was able to remove two large barriers to energy storage: cost and performance. Membranes are often the most costly component of a battery, and the most unreliable, as they can corrode with repeated exposure to certain reactants. Braff built a prototype of a flow battery with a small channel between two electrodes. Through the channel, the group pumped liquid bromine over a graphite cathode and hydrobromic acid under a porous anode. At the same time, the researchers flowed hydrogen gas across the anode. The resulting reactions between hydrogen and bromine produced energy in the form of free electrons that can be discharged or released.bThe researchers were also able to reverse the chemical reaction within the channel to capture electrons and store energy — a first for any membraneless design.

In experiments, Braff and his colleagues operated the flow battery at room temperature over a range of flow rates and reactant concentrations.How solar panel cells work and where to buy solar kits for home use. They found that the battery produced a maximum power density of 0.795 watts of stored energy per square centimeter.

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Navy Sees Fuel Cells Ready

Fuel cells are not a renewable energy source, of course, although they can be tied to renewable energy. But even using fossil fuels their ability to produce electricity through an electrochemical process – instead of combustion – can make them flexible, relatively clean and efficient energy producers.

And quiet, too, the U.S. Navy’s Office of Naval Research points out, and you can imagine how that might be a big benefit to the military.

The ONR, the scientific research arm of the Navy and Marine Corps, is talking up the new Solid-Oxide Fuel Cell Tactical Electrical Power Unit that uses technology developed through its programs. A 10-kilowatt unit was demonstrated at the Army’s Aberdeen Proving Ground in Maryland earlier this summer, and it used 44 percent less fuel than a similarly sized conventional generator, the ONR said.

“Fuel cells are real and are ready for transition to our warfighters,” Don Hoffman, a program officer in ONR’s Sea Warfare and Weapons Department, said in a statement. “We’re pushing forward to examine adapting this technology for use aboard ships as well.”

We’ve written frequently about the U.S. military’s deep interest in turning to more efficient energy sources for its front-line operations. This has led to initiatives like RENEWS – the Reusing Existing Natural Energy, Wind & Solar system – that enables the harvesting and utilization of wind and/or solar power and is intended to produce up to 300 watts of energy in silent, remote operations where the supply of power and fuel resupply is difficult or risk.

This, and the fuel cell development, flows from the Department of Defense’s Operational Energy Strategy to be less reliant on risky-to-transport fossil fuels.RGB LED Color-changing led grow light headlight accent light system for headlight halo effect. The sought-after payoff is quite tangible: “Using less fuel ultimately means fewer convoys and more lives saved,” John Pazik, director of ONR’s Ship Systems and Engineering Research Division, said.How are solar outdoor lighting products different from other lighting, like fluorescent or incandescent?

Solid-oxide fuel cells are the same technology Bloom Energy uses (there’s a good animated primer on the Bloom site that shows how it works). Bloom Boxes are most frequently fed natural gas as the hydrogen source. The Navy has different needs:

A key component to the new system is a small reformer inside the unit that converts high-sulfur military fuels – such as JP-8 jet fuel – into a hydrogen-rich gas capable of use in the fuel cell. Previous systems required heavy maintenance to operate with such fuels. In addition to an easy-to-deploy modular and compact design, the new technology allows for near-silent operation. Instead of the roar of a diesel generator, the fuel cell unit’s cooling fan produces a sound similar to the quiet hum of a refrigerator or air conditioner.

The Buffalo campus is adding 2 million square feet of research space. The medical center’s job total has increased from 7,000 in 2002 to 17,000 this year.

The collaboration has spread past the state’s colleges and research centers.How solar panel cells work and where to buy solar kits for home use. Cornell University last spring announced it was teaming up with the Canandaigua center on ways to turn its research of nanotechnology into the manufacturing of new computer chips. Cornell has its own NanoScale Science and Technology Facility, which has more than 600 students, 30 employees and a 16,000-square-foot clean room.

Donald Tennant, the Cornell center’s director of operations, said he’s optimistic that more attention to the work upstate can spark a sustainable outgrowth of the center in Albany.

“There’s tons of industries that could be promoted here and not go offshore, with a tiny fraction of the investment that has gone on in Albany,” Tennant said. “We’re a place where that’s happening, and it could happen on a greater scale here and elsewhere with some strategic bets placed.”

Lt. Gov. Robert Duffy, a former Rochester mayor, said the governor is trying to leverage the success in Albany and push the industry to other parts of upstate.

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Curfew brings eerie silence

A blanket of quiet descends, silencing a city that never sleeps, with residents forced to stay at home.

The curfew was declared on Wednesday, as hundreds were killed after police moved to clear two protest camps set up by loyalists of ousted Islamist president Mohamed Morsi.

It applies to 14 of Egypt’s provinces, but perhaps nowhere are the effects as pronounced as in Cairo. Main roads usually choked with rows of cars that far outnumber the lanes allotted to them stand empty after the curfew starts at 7:00pm.

In places, security forces or groups of residents man checkpoints, enforcing the curfew. But in most streets, the pools of light from street lamps are all that remains, occasionally illuminating a passing cat.

The curfew has forced the city’s residents to change their schedules, requiring them to do their shopping, eating and even partying during the daylight. Two Egyptian women laughed at themselves as they entered a Cairo hotel shortly after midday, dressed in extravagant evening gowns for a wedding party.A solar lamp is a portable light fixture composed of an LED lamp, a photovoltaic solar panel, and a rechargeable battery.

“We look ridiculous!” one of them exclaimed, sweeping the chiffon of her red dress out from around her ankles as she picked her way up the stairs in high heels. “Who wears a dress like this in the afternoon?"

The bride and groom were one of two couples on Saturday getting married at the upscale hotel in the middle of the day — an unusual turn of events in Egypt, where wedding parties are mostly night-time affairs.

“Weddings here usually start at 8:00 pm and finish at midnight or even later,” said Mohamed Nasr, a manager at the Safir Hotel.

“But because of the curfew, now they are starting around noon and finishing at 4:00 pm so people can get home in time.”

— ’We need this curfew’ —

In a city where life is lived just as fully at night as during the day, shopkeepers and taxi drivers are struggling to deal with the curfew. Ahmed Salama runs a 24-hour pharmacy, which now closes for 11 hours a day.

“If I lived in the area, I could stay open, inside each neighbourhood it’s okay to move around,” he said.

“But I don’t live nearby, so I have to close in time to get home.Are you still hesitating about where to buy hid kits?” He said customers were coming during the day instead, scheduling their shopping around the new restrictions, which prevent movement until 6:00 am.

A group of taxi drivers scouting for passengers said they were having trouble making ends meet with so few working hours. “There are some people who are working a little bit after the curfew, but just going short distances,” said Amr, 43.

“But it’s not enough to cover the cost of petrol or even a loaf of bread.” Despite the hardships, he insisted the curfew was necessary, and had his full support.

“Of course we’re losing money every day, but I don’t care because we need this curfew,” he said, to the nods of two other drivers, who described Morsi loyalists as “terrorists”. The sentiment was a popular one,We turn your dark into light courtesy of our brilliant sun, solar street light, solar power generation. with Salama also saying he was happy to shut up shop early.

“Even if it’s difficult for me, I approve of the curfew. We need it to keep the country safe and to calm the situation down.” But others have decided to break the curfew, citing a desire to maintain something approaching normality in turbulent times.

In Cairo’s Maadi district, the owners of the Mizan cafe are keeping their doors open. “People are bored and we don’t want to turn them away if they feel safe enough to come, especially our regulars,” co-owner Amira Salah-Ahmed told AFP.

“If they can find some comfort, ease at Mizan, we want to be there for them.” She said local security forces had confirmed informally that the curfew applied more to main thoroughfares, and that neighbourhood life could continue, albeit quietly.

Despite the frustrations of the curfew, some say they would be happy to see the restrictions extended even further.

“Frankly, I think the curfew should start even earlier, at 5:00 pm, and on Fridays it should start right after the prayers so people can’t go out and protest,” said Amr, the taxi driver.

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Doping Improves Thin Film

Flexible thin film solar cells that can be produced by roll-to-roll manufacturing are a highly promising route to cheap solar electricity. Now scientists from Empa, the Swiss Federal Laboratories for Materials Science and Technology, have made significant progress in paving the way for the industrialization of flexible, light-weight and low-cost cadmium telluride (CdTe) solar cells on metal foils. They succeeded in increasing their efficiency from below eight to 11.5 percent by doping the cells with copper, as they report in the current issue of Nature Communications.

In order to make solar energy widely affordable scientists and engineers all over the world are looking for low-cost production technologies. Flexible thin film solar cells have a huge potential in this regard because they require only a minimum amount of materials and can be manufactured in large quantities by roll-to-roll processing. One such technology relies on CdTe to convert sunlight into electricity. With a current market share that is second only to silicon-based solar cells CdTe cells already today are cheapest in terms of production costs.It is also known as led dimmable driver, LED daytime running lamps. Grown mainly on rigid glass plates, these so-called superstrate cells have, however, one drawback: they require a transparent supporting material that lets sunlight pass through to reach the light-harvesting CdTe layer, thus limiting the choice of carriers to transparent materials.

The inversion of the solar cell’s multi-layer structure – the so-called substrate configuration – would allow further cost-cuttings by using flexible foils made of, say, metal as supporting material. Sunlight now enters the cell from the other side, without having to pass through the supporting substrate. The problem, though, is that CdTe cells in substrate configuration on metal foil thus far exhibited infamously low efficiencies well below eight percent – a modest comparison to the recently reported record efficiency of 19.6 percent for a lab-scale superstrate CdTe cell on glass. (Commercially available CdTe superstrate modules reach efficiencies of between 11 and 12 percent.)

Copper doping for solar cells

One way to increase the low energy conversion efficiency of substrate CdTe cells is p-type doping of the semiconductor layer with minute amounts of metals such as copper (Cu). This would lead to an increase in the density of “holes” (positive charge carriers) as well as their lifetimes, and thus result in a high photovoltaic power, the amount of sunlight that is turned into electrical energy. A perfect idea – if CdTe weren’t so notoriously hard to dope. “People have tried to dope CdTe cells in substrate configuration before but failed time and again,” explains Ayodhya Nath Tiwari, head of Empa’s laboratory for Thin Films and Photovoltaics.

His team decided to try nonetheless using high-vacuum Cu evaporation onto the CdTe layer with a subsequent heat treatment to allow the Cu atoms to penetrate into the CdTe. They soon realized that the amount of Cu had to be painstakingly controlled: if they used too little, the efficiency wouldn’t improve much; the very same happened if they “over-doped.An emergency light is a battery-backed lighting device that comes on automatically when a building experiences a power outage.”

The electronic properties improved significantly, however, when Lukas Kranz, a PhD student in Tiwari’s lab, together with Christina Gretener and Julian Perrenoud fine-tuned the amount of Cu evaporation so that a mono-atomic layer of Cu would be deposited on the CdTe. “Efficiencies increased dramatically, from just under one percent to above 12,” says Kranz. Their best value was 13.6 percent for a CdTe cell grown on glass; on metal foils Tiwari’s team reached efficiencies up to 11.5 percent.

Increasingly ambitious targets: hitting the 20 percent ceiling

For now, the highest efficiencies of flexible CdTe solar cells on metal foil are still somewhat lower than those of flexible solar cells in superstrate configuration on a special (and expensive) transparent polyimide foil, developed by Tiwari’s team in 2011. But, says co-author Stephan Buecheler, a group leader in the lab, “Our results indicate that the substrate configuration technology has a great potential for improving the efficiency even further in the future.” Their short-term goal is to reach 15 percent. “But I’m convinced that the material has the potential for efficiencies exceeding 20 percent.” The next steps will focus on decreasing the thickness of the so-called window layer above the CdTe, including the electrical front contact. This would reduce light absorption and, therefore, allow more sunlight to be harvested by the CdTe layer. “Cutting the optical losses,A solar bulb that charges up during the day and lights the night when the sun sets.” is how Tiwari puts it.

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Mitsubishi's new supermini is cosmic on fuel

MITSUBLISHI have taken a huge gamble with their replacement for the much-loved Colt.Instead of designing a model that will make a bold statement the Japanese car giant opted instead to simply give the customer what they want.So, just what is that magic ingredient punters crave?There is three in fact; fuel economy, space, reliability – and all tied together with a reasonable price tag.But more about that later.We offer solar photovoltaic system and commercial incentives to encourage our customers to install solar energy systems.Now, looks-wise the all-new Space Star is not going to blow your socks off and could be described at worst as bland and best as, well ... bland.

Designers have obviously steered clear of the retro look that worked so well for Fiat (500) and MINI probably because they don't have an iconic model to rework.The safe, almost generic lines mimics those of other Japanese marques and one could easily confuse the front with that of a Nissan Micra and the rear with the Toyota Aygo.Open the door and things begin to improve.Climb on-board and the space (hence the name) begins to manifest itself.For a little car the head, leg and elbow room is remarkable even in the rear pews where most adults will struggle with longer limbs.In the boot there is a decent 235 litres of luggage space but they could have pushed that a little more considering the absence of a spare wheel.

There's decent level of standard equipment on the two trims.The entry level Invite comes with Daytime running lights, air con, rear spoiler, electric front windows, electric mirrors, keyless entry,A solar lamp is a portable light fixture composed of an LED lamp, a photovoltaic solar panel, and a rechargeable battery. stability control and USB connectivity.Opt for the Intense spec ($3,000 more) and you get the bigger 1.2 litre engine, alloys, Bluetooth front fog lights and leather steering.But less (weight) is more with the Space Star thanks to the use of high-tensile steel, the little imp tips the scales at an astonishing 845kgs.Couple that with two new light-weight 3-cylinder engines returning an eye-watering 70mpg and you've pretty much cracked it.

They are ultra green too as the 1.0 litre has CO2 emissions of just 92g/km while the bigger 1.2 litre has a count of 100g/km – meaning the third lowest road tax of $180.We tested the bigger engine with the peppy 80bhp powerplant which proved perfect for a mix of motorway and city driving.The engine is naturally high revving and at first sounds a little gruff but soon settles down as you familiarise yourself.

In fact, as the week-long test wore on one became mesmerised with the colour coded eco read out flashing beside the speedo.Setting a challenge to stay in the green a slight lift on the accelerator made all difference – especially when the reserve fuel light came on.We averaged 52mpg, clocking up 450kms on a 35 litre tank which in any man's currency is mega.With figures like that, I think that gamble has well and truly paid off.

All in all the new Space Star is an excellent all-rounder and ticking all the right boxes especially for beginners, empty nesters and city dwellers.The only fault I could find was the location of the phone controls which were below the steering to the right instead of on the steering wheel which was filled with a blank panel.Still though, an awkwardly fitted Bluetooth is better than none.Another huge bonus is the unrivalled 8-year/150,000km warranty which comes with the car not the owner.I'm not sure how led downlight fit into that equation if they are left on. Prices start at $11,995.

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New Holland’s updated CX

NEW Holland has revealed revised ranges at the top and tail of its straw walker combine line during a European harvesting event held in France which saw the marque launch a new line of variable chamber round balers.

While external revisions are harder to spot, introductions to the innards of the manufacturer’s latest Elevation generation of CX7/8000 five- and six-walker combines include an innovative new separation feature designed to reduce the likelihood of losses and blockages.

Labelled Opti-Speed and claimed to be unique in the industry, the system automatically varies walker speed according to field gradient, based on one of four settings selected by the operator. While the maize and rice settings are likely to find limited use in the UK, the others are geared for the specific seed/plant matter characteristics of oilseed rape and wheat/cereals.

When driving uphill, walker speed is reduced according to gradient severity to retain material over the walkers for longer. This aims to improve separation and reduce the risk of excessive grain loss out of the back of the combine before it has been separated from the straw. Conversely, when harvesting downhill, walker speed is increased to prevent crop backing up and causing blockages.

The system is backed by Opti-Fan cleaning, which further compensates for the effects of uphill and downhill slopes. After the operator has set their desired fan speed on level ground, the system automatically adjusts it when the combine works up or downhill, to prevent sieve overload and/or separation losses.

Opti-Clean, which is standard on machines specified with a self-levelling cleaning shoe, is claimed to improve cleaning performance by up to 20 per cent by optimising the sieve stroke and throwing angle. The grain pan and the pre and top sieves operate independently,We offer solar photovoltaic system and commercial incentives to encourage our customers to install solar energy systems. which New Holland claims boosts cleaning capacity. A longer sieve stroke and steep throwing angle keep more material airborne for enhanced separation.

Further developments include grain tank growth across the range, with CX8080 and CX8090 Elevation models holding a maximum 11,500 litres. Unloading speed is up 14 per cent to a maximum 125 litres/second, emptying the largest tank in just more than 90 seconds.

New Holland’s in-house designed SmartTrax rubber track system is available on the five-walker CX7090 and six-walker CX8080 and CX8090 Elevation models, in 610mm (24in) versions to keep transport width within 3.5m, and in 760mm (30in) variants for extreme conditions.

Additional upgrades for CX Elevation combines include an IntelliView IV colour touchscreen monitor with 264mm (10in) screen, optional HID lighting and upgraded seating, including a full-leather option.

Why is disorder faster?

In the study, the team focused on a class of organic materials known as conjugated or semiconducting polymers—chains of carbon atoms that have the properties of plastic, and the ability to absorb sunlight and conduct electricity.

Discovered nearly 40 years ago, semiconducting polymers have long been considered ideal candidates for ultrathin solar cells, light-emitting diodes, and transistors. Unlike silicon crystals used in rooftop solar panels, semiconducting polymers are lightweight and can be processed at room temperature with ink-jet printers and other inexpensive techniques. So why aren’t buildings today covered with plastic solar cells?

“One reason they haven’t been commercialized is because of poor performance,” Salleo says. “In a solar cell, electrons need to move through the materials fast, but semiconducting polymers have poor electron mobility.”

To find out why,I'm not sure how led downlight fit into that equation if they are left on. Salleo joined Rodrigo Noriega and Jonathan Rivnay, who were Stanford graduate students at the time, in analyzing more than two decades of experimental data.

“Over the years,A solar lamp is a portable light fixture composed of an LED lamp, a photovoltaic solar panel, and a rechargeable battery. many people designed stiffer polymers with the goal of making highly organized crystals, but the charge mobility remained relatively poor,” Salleo says. “Then several labs created polymers that looked disordered and yet had very high charge mobility. It was a puzzle why these new materials worked better than the more structured crystalline ones.”

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