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aries1988 : energy   36

China’s Ambitious Plan to Build the World’s Biggest Supergrid

But even as China celebrates the completion of more than 30,000 km of UHV lines, power engineers are struggling to master the resulting hybrid AC-DC transmission system. They must ensure that the new long-haul DC lines don’t destabilize China’s regional AC grids. For example, if the 8-gigawatt DC line from Gansu were to unexpectedly go off line, the power shock could cause widespread blackouts in Hunan and beyond.

To minimize the threat, the State Grid Corp. of China, a state-owned company that runs most of China’s transmission and distribution grids, intentionally limits the line’s throughput to no more than 4.5 GW. In practice, the line has carried less than one-quarter of its design capacity on average. That’s one reason why over one-third of Gansu province’s theoretical wind output and one-fifth of its solar potential went unused in 2017. Other UHV lines in neighboring regions have similarly operated below capacity. And eastern provinces don’t have sufficient incentive to import the cleaner power that the UHV lines offer.

State Grid’s long-term goal to interconnect its regional grids should also reduce curtailment, experts say. Zhang Ning, an authority on renewables integration at Tsinghua University, points out that the Southwest grid’s hydropower can balance the fluctuations in the Northwest’s wind and solar output. If we interconnect the West, curtailment of wind power there can be reduced from more than 20 percent to 5 percent, he estimates, and both regions’ use of coal can also be cut.
numbers  china  today  energy  eolien  technology  engineering  corporation 
february 2019 by aries1988
Toolkit Produced for Optimizing Floating Renewables Devices
The toolkit consists of two main components: Computational Fluid Dynamics (CFD) using Proteus open-source software and Multi-Body Dynamics (MBD) using the Chrono open-source solver. Both models have been validated separately and together. Using a CFD model early in development can reduce costs in design optimization by performing full-scale simulations under realistic sea states, before performing laboratory tests which may be subject to practical limitations. 
ocean  energy  wave  eolien  offshore  cfd 
december 2018 by aries1988
PPE: l'éolien en mer "sabordé", selon France Énergie éolienne
Ils ont promis un triplement de l'éolien terrestre d'ici 2030. Concernant l'éolien en mer, le premier parc sera mis en service au large de Saint-Nazaire durant le quinquennat "et nous lancerons quatre nouveaux appels d'offres", a indiqué Emmanuel Macron. L'exécutif vise ainsi jusqu'à 35,6 gigawatts (GW) de capacités dans l'éolien terrestre en 2028 et jusqu'à 5,2 GW en mer. France énergie éolienne estime que le déploiement de l'éolien en mer est ainsi "sabordé". "Avec des objectifs réduits de moitié par rapport aux recommandations de la filière, le gouvernement renonce au potentiel énergétique et industriel de cette énergie", estiment les professionnels.
2018  project  france  energy  eolien  numbers  ocean 
november 2018 by aries1988
Pourquoi change-t-on d'heure deux fois par an ? - Direct Energie
L’idée n’est appliquée pour la première fois qu’en 1916 en Allemagne et adoptée définitivement en France en 1973 pour amortir la crise pétrolière. Elle sera généralisée à toute l’union européenne en 1980, sur la base de ce même principe : profiter d’une heure supplémentaire d’éclairage naturel et ainsi faire des économies sur l’éclairage artificiel. Aujourd’hui 70 pays sont adeptes du changement d’heure. 

En pratique, le passage à l'heure d'été (+1h) se fait toujours dans la nuit du dernier samedi de mars tandis que le passage à l'heure d'hiver (-1h) se fait dans la nuit du dernier dimanche d'octobre.

La discussion est en cours mais elle devrait durer plusieurs mois encore. En tout cas, selon une consultation publique, 80% des Européens ont exprimé leur souhait de voir le changement d'heure être supprimé. Si la mesure disparaissait à l'avenir, pas moins de 510 millions d'Européens seraient concernés.
explained  history  energy  time  europe 
october 2018 by aries1988
A Grand New Theory of Life's Evolution on Earth - The Atlantic
Judson divides the history of the life on Earth into five energetic epochs, a novel schema that you will not find in geology or biology textbooks. In order, the energetic epochs are: geochemical energy, sunlight, oxygen, flesh, and fire. Each epoch represents the unlocking of a new source of energy, coinciding with new organisms able to exploit that source and alter their planet. The previous sources of energy stay around, so environments and life on Earth become ever more diverse. Judson calls it a “step-wise construction of a life-planet system.”

Which brings us to the epoch of oxygen. Given an opportunity, oxygen will steal electrons from anything it finds. New oxygen-resistant organisms evolve with enzymes to protect them from oxygen. They have advantages too: Because oxygen is so reactive, it makes the metabolism of these organisms much more efficient. In some conditions, organisms can get 16 times as much energy out of a glucose molecule with the presence of oxygen than without.

“Flesh” is source of concentrated energy, rich in fats and protein and carbon.
evolution  earth  energy  idea  book 
july 2018 by aries1988
Winds of change blow through renewable energy market

Developers who have made subsidy-free bids are relying on rises in wholesale power prices, further dramatic cost reductions in the industry and continued developments in wind turbine technology.

Turbines being installed today have a capacity of about 9 megawatts but by the middle of the next decade, developers are hoping to fit much taller, more powerful turbines of 13-15MW. This would mean fewer per project.

Gunnar Groebler, head of wind at Vattenfall, believes the risks of subsidy-free projects can be reduced by striking long-term power supply contracts with large companies, known in the industry as corporate power purchase agreements (PPA). These are growing in popularity in Europe, as large companies, including Microsoft, seek to reduce their carbon emissions and their energy bills. 
2017  energy  eolien  europe 
january 2018 by aries1988
China's Day In The Sun And The Future Of The Solar Industry
China’s out to own the sun. What about the United States? Plus, what we're doing to protect ourselves from cyberattacks on energy grids.
energy  china  industry  job  workforce  usa  comparison  numbers  development  today 
may 2017 by aries1988
China Aims to Spend at Least $360 Billion on Renewable Energy by 2020

China intends to spend more than $360 billion through 2020 on renewable power sources like solar and wind, the government’s energy agency said on Thursday.

The agency said in a statement that China would create more than 13 million jobs in the renewable energy sector by 2020, curb the growth of greenhouse gasses that contribute to global warming and reduce the amount of soot that in recent days has blanketed Beijing and other Chinese cities in a noxious cloud of smog.

Greenpeace estimates that China installed an average of more than one wind turbine every hour of every day in 2015, and covered the equivalent of one soccer field every hour with solar panels.

curtailment, or the amount of electricity generated by wind and solar that never finds its way to the country’s power grid. In China, wind power curtailment was 19 percent in the first nine months 2016, Mr. Myllyvirta said, many times higher than in the United States, where curtailment levels are often negligible.

The main reason for curtailment, he said, is that China is plagued by overcapacity in electricity generation and operators of China’s grid often favor electricity generated from coal.

My experience with China is when a numeric target gets written down, it gets implemented, Mr. Myllyvirta said. It doesn’t always get implemented in the way you like, but it does get implemented.
eolien  china  energy  numbers 
january 2017 by aries1988
BBC World Service - Business Daily, Wind of Change?
Cheap wind and solar power could soon make the coal, oil and gas industries defunct.
energy  eolien 
november 2016 by aries1988
新能源的并网给电力工程师带来了更为头疼的难题:天气。用户老爷们的需求已经够难对付了,这下又来了一个看老天爷脸色的奇葩……这日子没法过了(╯ ̄Д ̄)╯┻━┻ 2012 年吉林省的弃风率达到 32%,也就是 1/3 的发电量被白白丢在了风里。除了当地消费能力有限的原因之外,控制上的难题同样也是原因。风力和光伏短时间内的波动性非常严重,难以与电网同步,俗称“垃圾电”,如果直接并网会导致整个电力系统的不稳定。
eolien  electric  batteries  energy  engineering 
october 2016 by aries1988
BBC - Earth - Organisms might be quantum machines
This is the same kind of resonance you might experience when you sing in the shower – certain notes sound a lot louder and fuller than others. Hitting the right radio wave frequency will make the electron vibrate more vigorously in the same way.

Vanillin smells of vanilla, but eugenol, which is very similar in shape, smells of cloves. Some molecules that are a mirror image of each other – just like your right and left hand – also have different smells. But equally, some very differently shaped molecules can smell almost exactly the same.“

Olfaction requires a mechanism that somehow involves the actual chemical composition of the molecule,” he says. “It was that factor that found a very natural explanation in quantum tunnelling.”

Making use of quantum effects in biologically inspired photovoltaic cells, for instance, could give solar panels a huge boost in efficiency. “At this very moment there is quite a lot of activity in organic photovoltaics, to see whether with natural or artificial structures one can have an enhanced efficiency that exploit quantum effects.”
photosynthesis  photovoltaic  energy  biology  machine  quantum  physics  nature  future 
august 2016 by aries1988
Balance of power tilts from fossil fuels to renewable energy —
At the same time, fossil fuel companies are making strides in their efforts to remain competitive. This is not easy. Not only have oil and gas prices plunged over the past two years, but in the long term weaker demand and more abundant supply are expected. Valuations of companies in this sector have been badly dented.

Even so, the elements are being put in place for what could be a quite sudden and far-reaching energy transition, which could be triggered by an unexpected and sustained surge in oil prices. If China or India were to make large-scale policy commitments to electric vehicles, they would have a dramatic impact on the outlook for oil demand.
energy  transition  today  future 
august 2016 by aries1988
Fish School Us on Wind Power - Issue 37: Currents - Nautilus
As an undergraduate, Dabiri modeled the undulating movements of jellyfish. A decade later, he was involved in the construction of a medusoid—a synthetic jellyfish made from elastic silicone and the heart cells of a rat—that swims just like a living jelly when a pulsating electric field is applied.5 During that time, Dabiri also became fascinated with another unorthodox combination: schooling fish and wind power.

Fish position themselves in a staggered formation in order to use the turbulence created by their neighbors to swim more efficiently.Courtesy of Robert Whittlesey

Dabiri and Whittlesey don’t know exactly why turbines packed into closely positioned pairs are the most efficient, but they have a couple of working theories.

allows the turbine pairs to be packed more closely together—only four diameters apart compared to a norm of 15 diameters for horizontal-axis wind turbines
cfd  wind  energy  design  science  scientist  aerodynamics  ocean  moi  wt  instapaper_favs 
july 2016 by aries1988
Consommez-vous plus ou moins de gaz que la moyenne des Français ?
Connaître la consommation moyenne de gaz naturel de votre logement selon ses caractéristiques. Comparer les tarifs des concurrents de GDF Dolce Vita en ligne.
france  moi  energy 
march 2016 by aries1988
Le chauffage en appartement coûte en moyenne 1.162 € par an | Quelle Energie : Le magazine
Selon notre étude, plus de la moitié des appartements ont été construits avant 1975. Leur facture de chauffage s'élève, en moyenne, à 1.162 €.
moi  explained  france  energy 
march 2016 by aries1988
Sunshine revolution: the age of solar power -
For decades the electricity industry has been a cautious and conservative business, but the plunging prices of solar panels, down by about two-thirds in the past six years, have woken it up with a bang. Dynamic rooftop solar power companies have entered the market, in the most radical change to electricity supplies since the industry was born in the 19th century. It has been described as the equivalent of the mobile revolution in telephony, or the PC in computing.

Solar power and onshore wind power are the two most cost-effective forms of renewables but solar has the greater capacity for costs to fall further. “Wind is basically mechanics; solar is electronics. And the progress there is much more rapid, and will continue,” says Gérard Mestrallet, chief executive of Engie, the French energy group. Solar is also flexible in scale: it can power a calculator, or a city.

Electricity from SolarCity’s panels costs significantly less per kilowatt hour than the rates charged by NV Energy, the local utility. Typically customers can save 20-25 per cent on their electricity bills by going solar.
energy  comparison  eolien  sun  renewable  instapaper_favs 
november 2015 by aries1988
Wind and wave farms could affect Earth's energy balance
At present, humans use only about 1 part in 10,000 of the total energy that comes to Earth from the sun. But this ratio is misleading, Kleidon says. Instead, we should be looking at how much useful energy - called “free” energy in the parlance of thermodynamics - is available from the global system, and our impact on that.

Humans currently use energy at the rate of 47 terawatts (TW) or trillions of watts, mostly by burning fossil fuels and harvesting farmed plants, Kleidon calculates in a paper to be published in Philosophical Transactions of the Royal Society. This corresponds to roughly 5 to 10 per cent of the free energy generated by the global system.

Although the winds will not die, sucking that much energy out of the atmosphere in Kleidon’s model changed precipitation, turbulence and the amount of solar radiation reaching the Earth’s surface. The magnitude of the changes was comparable to the changes to the climate caused by doubling atmospheric concentrations of carbon dioxide (Earth System Dynamics, DOI: 10.5194/esd-2-1-2011).
eolien  opinion  earth  energy 
january 2015 by aries1988
Alstom lance la filière française de l’éolien marin
L’usine située en loire-Atlantique ne pourra pas se contenter du seul marché français.

Les industriels soulignent les atouts de la France : une facade martime importante et un bon régime des vents, un réseau de transport et de distribution d'électricité solide et bien maillé, de nombreuses entreprises impliquées dans les projets éoliens, de grands ports (Le Havre, Dunkerque, Nantes-Saint-Nazaire, Cherbourg, Brest) capables d'accueillir ces activités.

La plus grande inconnue reste le coût de l'électricité produite par ces éoliennes offshore. Dans le cadre de son obligation de rachat, EDF doit payer 180 à 200 euros le mégawattheure (MWh), un prix bien supérieur à toutes les autres formes d'énergie (nucléaire, charbon, gaz, hydraulique...). Le SER juge cependant possible, d'ici à 2030, de le ramener à 100-120 euros par MWh grâce à des gains de productivité sur la chaîne de fabrication, des progrès technologiques et une baisse des coûts d'installation.

Une filière vraiment française ? Plutôt franco-américaine. Le secteur énergie d'Alstom va, en effet, passer sous le contrôle de General Electric (GE) au premier semestre 2015. M. Valls n'a pas manqué de l'évoquer, affirmant que " l'alliance avec General Electric avance bien, conformément aux engagements pris en juin ". Cet accord prévoit notamment la création d'une coentreprise entre Alstom et le géant américain pour développer des équipements. Dans ce cadre, GE affirme qu'il va faire de Nantes le siège mondial de son activité dans les énergies marines renouvelables (éoliennes, hydroliennes...) : Alstom-GE a promis 250 emplois dans le centre nantais de recherche et développement, qui s'ajouteront aux 300 postes créés dans l'usine.
france  energy  eolien  future 
january 2015 by aries1988
energy  china 
july 2013 by aries1988
Reap the whirlwind for cheap renewable power - tech - 07 March 2013 - New Scientist
However, the power output scales up rapidly as you increase the turbine's diameter. Simpson calculates that a 10-metre turbine will produce so kilowatts of power using the same method. The team says that an array of these vortex turbines could produce 16 megawatts for every square kilometre they cover. This is not bad considering conventional wind turbines yield just 3 and 6 megawatts per square kilometre. In fact, the team estimates that the electricity produced by a Solar Vortex will be 20 per cent cheaper than energy from wind turbines and 65 per cent cheaper than solar power.
desert  energy  eolien  idea  video 
april 2013 by aries1988
Solar-powered aircraft: The Wright stuff? | The Economist
THERE is something of the 19th century about Eric Raymond. Devoted to making commercial solar-powered aircraft, he would have thrived in the Victorian heyday of the private inventor. Most fell by the wayside; their ideas outran their ability or their money. But the names of the successes—Morse, Dunlop, Bell, Diesel and even, to stretch the era into the early 20th century, the brothers Wright—have lived on.

The Duo has a wingspan of 23 metres and a planned weight, when the main gear and any other missing equipment is on board, of 270kg. A 20kW electric motor will drive the propeller, but all of those watts will be needed only during take off and climbing. In level flight, at an altitude of 6,000 metres, the 5kW provided by the solar panels will be enough both to drive the propeller and to recharge the batteries.
technology  future  energy  plane 
november 2012 by aries1988
德国弃核,先驱还是先烈? 南方周末记者亲历弃核后的德国
germany  nuclear  energy  strategy  future  report 
august 2012 by aries1988
China's Coal Country
Scenes from China's rust-belt, the engine of the country's meteoric rise.
photo  china  today  energy 
june 2012 by aries1988
Avenir du nucléaire : les trois scénarios envisageables | L'Energie d'avancer
Maintien de la filière nucléaire française. Réduction de la part de l’atome. Abandon progressif du nucléaire. Voici les trois scénarios envisageables pour l’avenir de l’atome. Si le drame de Fukushima a généré une importante remise en cause, les conséquences économiques et écologiques d’une sortie du nucléaire rendent cette option peu crédible. un réacteur EPR coûte 60 € par mégawattheure, comme les éoliennes les plus performantes.
future  energy  eolien  numbers  nuclear  comparison  language  français 
march 2011 by aries1988

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