Archives par mot-clé : Green Energy

Generating energy from sandy rivers—an untapped renewable resource ready for prime time?

by F.  Sotiropoulos, September 2018, in Stony Brook University/ published in Nature 


The use of in-stream flow (or hydrokinetic) energy converters in rivers appears to offer another workable and effective option to expand renewable energy and limit carbon emissions in the United States. While the potential for in-stream flow energy harvesting systems has already been demonstrated for rivers with fixed beds, researchers now developed a scaled demonstration of hydrokinetic energy generated from a river channel with a sandy bed. Their findings, detailed in a new paper published in Nature Energy, showed that the model hydrokinetic power plant can generate energy effectively and safely without undermining the stability of the river geomorphic environment.

L’électricité intermittente. Une réalité et un prix.

by prof. Samuel Furfari, 21 août 2018 in ScienceClimatEnergie


Il ne se passe pas un jour sans que surgisse sur les réseaux sociaux ou dans les médias une discussion sur le prix de l’électricité. Pour les uns, le prix de l’électricité produite par les énergies renouvelables est bas et pour les autres au contraire il est élevé. Qui a raison ?

Il faut examiner l’ensemble de la filière de la génération d’électricité pour pouvoir juger et non pas comme on le fait trop souvent se cantonner à un seul aspect. Nous allons donc procéder étape par étape, de manière à présenter de manière objective ce qu’il en est. Nous allons d’abord constater que la génération d’électricité à partir d’énergies renouvelables est déjà une forte réalité et qu’elle est en croissance. Nous allons ensuite observer qu’il est crucial d’équilibrer constamment la génération d’électricité et sa consommation et que cela ne peut se faire que par l’intermédiaire d’un réseau. Nous passerons ensuite au caractère intermittent de certaines énergies renouvelables et verrons quelles en sont les conséquences pour enfin pouvoir aborder la réalité des prix aux consommateurs. Dans la dernière partie nous allons parler du prix de l’électricité que nous payons en tant que consommateur et qui n’est pas bien entendu le coût de production.

Le but de cet article est qu’à travers cette démarche pédagogique le lecteur puisse se faire sa propre opinion sur la question du prix de l’électricité d’origine renouvelable.

Clean Energy Investment Trends, 2Q 2018

by BloombergNRF, July 9, 2018


Wind

Electricity generation using wind turbines. Included in this sector, are players across the entire value chain of both onshore and offshore developments. From manufacturers of turbines, components and subassemblies to developers, generators, utilities and engineering firm.

Solar

All technologies which capture energy directly from the sun. These include production of electricity using semiconductor-based photovoltaic (pv) materials, use of concentrated sunlight to heat fluids that drive power generation equipment (solar thermal), and passive methods which use sunlight to heat water. Whilst company level investment of passive methods is recorded, investment in passive projects is not.

Biofuels

Liquid transportation fuels including biodiesel and bioethanol. These can be derived from a range of biomass sources, including sugar cane, rape seed, soybean oil or non-food cellulosic feedstock. Our database excludes producers of base biomass, but includes suppliers of everything from the processing technologies and equipment, through the logistics of distribution, to manufacturers of energy systems which are specially adapted for the use of biofuels and products, and the services on which they depend.

Biomass & waste

Electricity and/or heat produced with bio-based feedstocks, typically through incineration but also through more advanced processes like gasification or anaerobic digestion. This sector also includes waste-to-energy which includes energy produced through landfill gas projects and incineration of municipal and industrial waste.

Energy smart technologies

This sector covers technologies like digital energy, smart grids, power storage, hydrogen and fuel cells, advanced transportation and energy efficiency on both the demand and supply side.

Other renewables

Includes small hydro – hydro projects with capacities smaller or equal to 50MW; geothermal – extraction of useful power from heat stored in the earth; marine – the extraction of tidal, wave and thermal energy from the ocean.

Growth In Thermal Generation Continues To Outpace Renewables In China

by P. Homewood, August 9, 2018 in NotaLotofPeopleKnowThat

Anybody who thinks China is rapidly shifting to renewable energy needs to look at the latest electricity data from the China Energy Portal.

Whilst wind and solar generation has increased by 51 TWh year-on-year in Q2, thermal has increased by 176.9 TWh.

https://chinaenergyportal.org/2018-q2-electricity-and-energy-statistics/

New Study Concludes Europe Will Always Require 100% Back-Up By Conventional Energy

by P. Gosselin, July 5, 2018 in NoTricksZone


A new German paper assesses wind energy in Europe . The results are devastating. It concludes that wind energy requires almost 100% backup and that the more capacity that gets installed, the greater the volatility.

The paper appearing at the VGB, authored by Thomas Linnemann and Guido Vallana, finds that “the total wind fleet output of 18 European countries extending over several thousand kilometers in north-south and east-west direction is highly volatile and exhibits a strong intermittent character.”

In other words the power supply across the European grid fluctuates wildly and thus cannot work well. The paper’s abstract continues: …

Why Are We Doing This? A Trove Of New Research Documents The Folly Of Renewable Energy Promotion

by K. Richard, July 9, 2018 in NoTricksZone


The advocacy for widespread growth in renewable energy (especially wind, solar, and biomass) usage has increasingly become the clarion call of the anthropogenic global warming (AGW) movement.  And yet more and more published research documents the adverse effects of relying on renewables.

Over the course of the last year, at least 30 papers have been published in the peer-reviewed scientific literature detailing the fatuity of promoting renewable energy as a long-term “fix” for climate change mitigation.  A categorized list of these papers is provided below.

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Vent contraire pour l’éolien terrestre

by Jean-Pierre Schaeken, 2 juliet 2018 in ScienceClimatEnergie


Le gouvernement belge a adopté le 16 juillet 2002 l’arrêté royal relatif à l’établissement des mécanismes visant à la promotion  de l’électricité produite à partir de sources d’énergie renouvelable. Ces dernières sont dominées, en Belgique par l’éolien et le photovoltaïque (l’éolien étant prédominant) c.à.d. des productions électriques intermittentes.

Ce reformatage  de la génération électrique a été décidé dans la précipitation sans analyser l’impact sur le système électrique, sur la compétitivité des entreprises et sur le pouvoir d’achat des ménages, la priorité étant la réduction des émissions de gaz à effet de serre (GES). Un tel manque flagrant de préparation est également patent dans la mise en place du tournant  énergétique allemand (Energie Wende), décision politique particulièrement désastreuse. (…)

Green No More: Germany Rejects EU’s Green Energy Ambitions

by Dr. Benny Peiser, June 13, 2018 in ClimateChangeDispatch


Voters across Europe have lost faith in politics partly because of “unachievable targets” on renewable energy, said German Energy Minister Peter Altmaier, who rejected calls from a group of other EU countries to boost the share of renewables to 33-35% of the bloc’s energy mix by 2030. —EurActive, 12 June 2018

The German government is about to concede officially that the country is on course to widely missing its 2020 climate target. —Clean Energy Wire, 12 June 2018

Les métaux sales de l’énergie propre ou la face cachée de transition énergétique …

par Professeur Alain Préat, 9 juin 2008, in ScienceClimatEnergie


Trois révolutions énergétiques depuis à peine plus d’un siècle. Nous sommes entrés dans la troisième révolution énergétique. La première vit le jour avec la machine à vapeur et participa à l’essor du charbon, avec la seconde le moteur thermique dérôna le charbon au profit des hydrocarbures, et la troisième révolution industrielle, en cours, est technologique et basée sur les énergies ‘vertes’ ou énergies intermittentes et l’informatique ou le numérique. Cette problématique vient d’être abordée dans un excellent ouvrage paru en 2018 .

Peut-on dire que cette progression récente suivant ces trois phases majeures de la technologie s’est effectuée dans le sens d’un meilleur respect de l‘état de la Planète. Bien que cela soit le discours officiel, rien n’en est moins sûr. Pourquoi ? Tout simplement par le méconnaissance de tout un chacun à comprendre ou savoir ce qui est réellement utilisé dans les énergies vertes et numériques. L’actuelle ‘transition énergétique’ a bon dos et elle a toutes les vertus, elle est propre, quant aux les hydrocarbures, le charbon, l’uranium et CO(ennemi n° 1) ils ont tous les maux, et sont tous sales. Il n’est pas un jour où cette opposition nous est rappelée…

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A question that gives pause: If Solar And Wind Are So Cheap, Why Are They Making Electricity So Expensive?

by M. Shellenberger, President, Env. Progr., May 16, 2018  in WUWT


Over the last year, the media have published story after story after story about the declining price of solar panels and wind turbines.

People who read these stories are understandably left with the impression that the more solar and wind energy we produce, the lower electricity prices will become.

And yet that’s not what’s happening. In fact, it’s the opposite.

Between 2009 and 2017, the price of solar panels per watt declined by 75 percent while the price of wind turbines per watt declined by 50 percent.

And yet — during the same period — the price of electricity in places that deployed significant quantities of renewables increased dramatically.

Electricity prices increased by:

Green Failure: German Solar Industry Crashes And Burns…Solar Jobs See Blood Bath!

by Michael Kruger, April 21, 2018 in P Gosselin NoTricksZone


Michael Kruger at German skeptic site Science Skeptical here writes about how solar energy indutry in Germany has disintegrated spectacularly.

What follows are 4 charts that show us some shocking trends, and how in reality the German solar industry has seen a bloodbath that can be rated as one of the worst in a long time. The reality is that Germany’s green revolution is far from being a model for the world.

New U.S. Record-Level Oil Production! Peak Oil Theory Disproven! Not.

by R. Heinberg, March 6, 2018 in Resilience.org


Well, I’m amazed and impressed. Tight oil production has pushed total United States petroleum output to more than 10 million barrels a day, a rate last seen almost a half-century ago. It’s a new U.S. record. Fifteen years ago I was traveling the world with a Powerpoint presentation featuring a graph of U.S. oil production history. That graph showed a clear peak in 1970 and a long bumpy decline thereafter. (…)

UK looks to fracking as cold snap exposes its poor energy supply

by J. Hodges and K. Gilblom, March 2, 2018 in BusinessDay


London — Britain’s natural gas fracking industry is using a cold snap that’s gripped large swathes of Europe this week and laid bare weaknesses in the UK’s energy supply to make its pitch.

Britain’s natural gas market has been stretched to its limits as the coldest spell since 2010 tests the nation’s energy and transport network. UK pipeline manager National Grid Plc even urged industry to curb its gas usage while the cold weather persisted. (…)

Strategic minerals – Our next energy and security crisis?

by Paul Driessen, February 26, 2018 in WUWT


America has had its share of oil-centered energy problems and disruptions. Now it faces potential renewable energy and high technology crises, because of its heavy reliance on imports of the rare earth and other strategic minerals that are the essential building blocks for wind turbines, solar panels, computers, smart phones, medical diagnostic devices, night vision goggles, GPS and communication systems, long-life batteries and countless other applications.

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