It all started in Vermont in 1997. Our passion for protecting the environment led us to our mission: to use the power of consumer choice to change the way power is made. Today, as the longest-serving renewable energy retailer, we remain committed to sustainability every step of the way. By offering only products with an environmental benefit and operating with a zero-carbon footprint, we’re living our promise to the planet, inside and out.
A solar vehicle is an electric vehicle powered completely or significantly by direct solar energy. Usually, photovoltaic (PV) cells contained in solar panels convert the sun’s energy directly into electric energy. The term “solar vehicle” usually implies that solar energy is used to power all or part of a vehicle’s propulsion. Solar power may be also used to provide power for communications or controls or other auxiliary functions. Solar vehicles are not sold as practical day-to-day transportation devices at present, but are primarily demonstration vehicles and engineering exercises, often sponsored by government agencies. However, indirectly solar-charged vehicles are widespread and solar boats are available commercially.
In another farming town, in Ivory Coast, I talked to a man named Abou Traoré, who put his television out in a courtyard most nights, so that neighbors could come by to watch. He said that they tuned in for soccer matches—the village tilts Liverpool, but has a large pocket of Manchester United supporters. What else did he watch? Traoré considered. “I like the National Geographic channel,” he replied—that is, the broadcast arm of the institution that became famous showing Westerners pictures of remote parts of Africa.
But our homes will still require AC power to draw extra energy from and send excess energy back to the grid. So an inverter, which can convert electricity from DC to AC, is required to connect the solar panels to the home’s electrical system. Inverters are typically installed right outside the breaker box, allowing the home to use the solar power first, then if the demand is too high, the home can grab more power off the grid. Conversely, if the solar system is creating more electric energy than the home needs, it can send that power out into the grid, reducing our overall demand on nuclear and fossil fuels. Some places even allow you to sell the excess energy you create back into the grid, an activity known as “net metering” which is attractive to many potential solar customers.
The success of WS1, WS2, and WS3 and other yet-undefined water-splitting schemes is predicated on systems that promote the conversion of oxygen from metal oxos. Many mechanistic possibilities for this conversion await discovery. They include the following.
WASHINGTON – America’s transition to a clean energy economy is irrevocably underway renewable energy delivering deep pollution reductions, with coal use at record lows but renewable energy higher than ever, according to the Fourth Annual Energy Report released today by the Natural Resources Defense Council (NRDC). One sign of how far things have advanced: more than one-fifth of the U.S. population lives in a state with a goal of at least 50 percent renewable energy.
Linear Fresnel reflector (LFR) systems are similar to parabolic trough systems in that mirrors (reflectors) concentrate sunlight onto a receiver located above the mirrors. These reflectors use the Fresnel lens effect, which allows for a concentrating mirror with a large aperture and short focal length. These systems are capable of concentrating the sun’s energy to approximately 30 times its normal intensity. The only operating linear Fresnel reflector system in the United States is a compact linear Fresnel reflector (CLFR)—also referred to as a concentrating linear Fresnel reflector—a type of LFR technology that has multiple absorbers within the vicinity of the mirrors. Multiple receivers allow the mirrors to change their inclination to minimize how much they block adjacent reflectors’ access to sunlight. This positioning improves system efficiency and reduces material requirements and costs.
We take the earth’s most abundant resources – the strength of the wind, the force of water, and the heat of the sun, – and put them to work with breakthrough technology that unleashes their true possibilities.
Our solar panel systems look right at home on your roof with a super sleek, low profile design. With integrated front skirts and no visible hardware, we offer a clean look that our competitors can only admire. See for yourself.
There are several advantages of photovoltaic solar power that make it “one of the most promising renewable energy sources in the world.” It is non-polluting, has no moving parts that could break down, requires little maintenance and no supervision, and has a life of 20-30 years with low running costs. It is especially unique because no large-scale installation is required. Remote areas can easily produce their own supply of electricity by constructing as small or as large of a system as needed. Solar power generators are simply distributed to homes, schools, or businesses, where their assembly requires no extra development or land area and their function is safe and quiet. As communities grow, more solar energy capacity can be added, “thereby allowing power generation to keep in step with growing needs without having to overbuild generation capacity as is often the case with conventional large scale power systems.” Compare those characteristics to those of coal, oil, gas, or nuclear power, and the choice is easy. Solar energy technologies offer a clean, renewable and domestic energy source.
Back in January, the Edison Electric Institute — the (typically stodgy and backward-looking) trade group of U.S. investor-owned utilities — released a report [PDF] that, as far as I can tell, went almost entirely without notice in the press. That’s a shame. It is one of the most prescient and brutally frank things I’ve ever read about the power sector. It is a rare thing to hear an industry tell the tale of its own incipient obsolescence.
This basic reaction type is the foundation on which oxidation catalysts have been developed in the disciplines of organometallic and organic chemistry (60). Here the olefin bond attacks a metal oxo species to form two carbon–oxygen bonds. The replacement of the two-electron bond of the olefin by the lone pair of hydroxide would lead to the oxygen–oxygen bond-forming reaction that is critical for water oxidation. The substitution, however, is not trivial. OH− is thermodynamically more difficult to oxidize than are olefins. Also, the overall reaction to produce oxygen involves a four-electron change at the metal, so there may be benefits to examining reductive elimination from more than one metal center, in which the multielectron equivalency can be shared by metal centers working in concert.
Tzempelikos, Athanassios; Athienitis, Andreas K. (2007). “The impact of shading design and control on building cooling and lighting demand”. Solar Energy. 81 (3): 369–382. Bibcode:2007SoEn…81..369T. doi:10.1016/j.solener.2006.06.015.
The number of cities reporting they are predominantly powered by clean energy has more than doubled since 2015, as momentum builds for cities around the world to switch from fossil fuels to renewable sources.
Water scarcity is another risk for non-renewable power plants. Coal, nuclear, and many natural gas plants depend on having sufficient water for cooling, which means that severe droughts and heat waves can put electricity generation at risk. Wind and solar photovoltaic systems do not require water to generate electricity and can operate reliably in conditions that may otherwise require closing a fossil fuel-powered plant. (For more information, see How it Works: Water for Electricity.)
In February 2011, the U.S. Department of Energy (DOE) launched its SunShot initiative, a collaborative national effort to cut the total cost of photovoltaic solar energy systems by 75% by 2020. Reaching this goal would make unsubsidized solar energy cost-competitive with other forms of electricity and get grid parity . The SunShot initiative included a crowdsourced innovation program run in partnership with Topcoder, during which 17 different solar energy application solutions were developed in 60 days. In 2011, the price was $4/W, and the SunShot goal of $1/W by 2020 was reached in 2017.
Solar Cells (or Photovoltaic Cell) (PV) A device that produces an electric reaction to light, thereby producing electricity Solar cells are the electrical building blocks for solar panels. The blue or black squares are silicon cells producing about 0.5 volts of DC electricity each.
Leon, M.; Kumar, S. (2007). “Mathematical modeling and thermal performance analysis of unglazed transpired solar collectors”. Solar Energy. 81 (1): 62–75. Bibcode:2007SoEn…81…62L. doi:10.1016/j.solener.2006.06.017.
When those states need more electricity than they are producing, they pay California for the power. But California has excess power on a growing number of days when neighboring states don’t need it, so California has to pay them to take it. CAISO calls that “negative pricing.”