Portal:Renewable energy
IntroductionRenewable energy (or green energy) is energy from renewable natural resources that are replenished on a human timescale. The most widely used renewable energy types are solar energy, wind power, and hydropower. Bioenergy and geothermal power are also significant in some countries. Some also consider nuclear power a renewable power source, although this is controversial. Renewable energy installations can be large or small and are suited for both urban and rural areas. Renewable energy is often deployed together with further electrification. This has several benefits: electricity can move heat and vehicles efficiently and is clean at the point of consumption. Variable renewable energy sources are those that have a fluctuating nature, such as wind power and solar power. In contrast, controllable renewable energy sources include dammed hydroelectricity, bioenergy, or geothermal power. Renewable energy systems have rapidly become more efficient and cheaper over the past 30 years. A large majority of worldwide newly installed electricity capacity is now renewable. Renewable energy sources, such as solar and wind power, have seen significant cost reductions over the past decade, making them more competitive with traditional fossil fuels. In most countries, photovoltaic solar or onshore wind are the cheapest new-build electricity. From 2011 to 2021, renewable energy grew from 20% to 28% of global electricity supply. Power from the sun and wind accounted for most of this increase, growing from a combined 2% to 10%. Use of fossil energy shrank from 68% to 62%. In 2022, renewables accounted for 30% of global electricity generation and are projected to reach over 42% by 2028. Many countries already have renewables contributing more than 20% of their total energy supply, with some generating over half or even all their electricity from renewable sources. The main motivation to replace fossil fuels with renewable energy sources is to slow and eventually stop climate change, which is widely agreed to be caused mostly by greenhouse gas emissions. In general, renewable energy sources cause much lower emissions than fossil fuels. The International Energy Agency estimates that to achieve net zero emissions by 2050, 90% of global electricity generation will need to be produced from renewable sources. Renewables also cause much less air pollution than fossil fuels, improving public health, and are less noisy. The deployment of renewable energy still faces obstacles, especially fossil fuel subsidies, lobbying by incumbent power providers, and local opposition to the use of land for renewable installations. Like all mining, the extraction of minerals required for many renewable energy technologies also results in environmental damage. In addition, although most renewable energy sources are sustainable, some are not. (Full article...) Selected article -
Waves are generated primarily by wind passing over the sea's surface and also by tidal forces, temperature variations, and other factors. As long as the waves propagate slower than the wind speed just above, energy is transferred from the wind to the waves. Air pressure differences between the windward and leeward sides of a wave crest and surface friction from the wind cause shear stress and wave growth. Wave power as a descriptive term is different from tidal power, which seeks to primarily capture the energy of the current caused by the gravitational pull of the Sun and Moon. However, wave power and tidal power are not fundamentally distinct and have significant cross-over in technology and implementation. Other forces can create currents, including breaking waves, wind, the Coriolis effect, cabbeling, and temperature and salinity differences. As of 2023, wave power is not widely employed for commercial applications, after a long series of trial projects. Attempts to use this energy began in 1890 or earlier, mainly due to its high power density. Just below the ocean's water surface the wave energy flow, in time-average, is typically five times denser than the wind energy flow 20 m above the sea surface, and 10 to 30 times denser than the solar energy flow. In 2000 the world's first commercial wave power device, the Islay LIMPET was installed on the coast of Islay in Scotland and connected to the UK national grid. In 2008, the first experimental multi-generator wave farm was opened in Portugal at the Aguçadoura wave park. Both projects have since ended. For a list of other wave power stations see List of wave power stations. Wave energy converters can be classified based on their working principle as either:
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– Amory Lovins, Soft Energy Paths, 1977, pp. 38–40. Main topicsWikiProjectsSelected image -View of the solar energy dish at the Ben-Gurion National Solar Energy Center in Israel.
The world's largest solar energy dish at the Ben-Gurion National Solar Energy Center in Sde Boker, Israel. Selected biography -Elon Reeve Musk FRS (/ˈiːlɒn/; born June 28, 1971) is a businessman known for his key roles in the space company SpaceX and the automotive company Tesla, Inc. His other involvements include ownership of X Corp., the company that operates the social media platform X (formerly Twitter), and his role in the founding of the Boring Company, xAI, Neuralink, and OpenAI. Musk is the wealthiest individual in the world; as of November 2024[update], Forbes estimates his net worth to be US$323 billion. A member of the wealthy South African Musk family, Musk was born in Pretoria and briefly attended the University of Pretoria before immigrating to Canada at the age of 18, acquiring citizenship through his Canadian-born mother. Two years later, he matriculated at Queen's University at Kingston in Canada. Musk later transferred to the University of Pennsylvania and received bachelor's degrees in economics and physics. He moved to California in 1995 to attend Stanford University but never enrolled in classes, and with his brother Kimbal co-founded the online city guide software company Zip2. The startup was acquired by Compaq for $307 million in 1999. That same year, Musk co-founded X.com, a direct bank. X.com merged with Confinity in 2000 to form PayPal. In 2002, Musk acquired US citizenship, and that October eBay acquired PayPal for $1.5 billion. Using $100 million of the money he made from the sale of PayPal, Musk founded SpaceX, a spaceflight services company, in 2002. In 2004, Musk was an early investor in electric-vehicle manufacturer Tesla Motors, Inc. (later Tesla, Inc.), providing most of the initial financing and assuming the position of the company's chairman. He later became the product architect and, in 2008, the CEO. In 2006, Musk helped create SolarCity, a solar energy company that was acquired by Tesla in 2016 and became Tesla Energy. In 2013, he proposed a hyperloop high-speed vactrain transportation system. In 2015, he co-founded OpenAI, a nonprofit artificial intelligence research company. The following year Musk co-founded Neuralink, a neurotechnology company developing brain–computer interfaces, and The Boring Company, a tunnel construction company. In 2018 the U.S. Securities and Exchange Commission (SEC) sued Musk, alleging that he had falsely announced that he had secured funding for a private takeover of Tesla. To settle the case Musk stepped down as the chairman of Tesla and paid a $20 million fine. In 2022, he acquired Twitter for $44 billion, merged the company into the newly-created X Corp. and rebranded the service as X the following year. In March 2023, Musk founded xAI, an artificial-intelligence company. Musk's actions and expressed views have made him a polarizing figure. He has been criticized for making unscientific and misleading statements, including COVID-19 misinformation, promoting right-wing conspiracy theories, and endorsing an antisemitic trope; he has since apologized for the latter. His ownership of Twitter has been controversial because of the layoffs of large numbers of employees, an increase in hate speech, misinformation and disinformation posts on the website, and changes to website features, including verification. In early 2024, Musk became active in American politics as a vocal and financial supporter of Donald Trump, becoming Trump's second-largest individual donor in October 2024. In November 2024, Trump announced that he had chosen Musk along with Vivek Ramaswamy to co-lead Trump's planned Department of Government Efficiency (DOGE) advisory board which will make recommendations on improving government efficiency through measures such as slashing "excess regulations" and cutting "wasteful expenditures". (Full article...) Did you know? -... that because solar cookers use no fuel and they cost nothing to run, humanitarian organizations are promoting their use worldwide to help slow deforestation and desertification, caused by using wood as fuel for cooking ? Solar Cookers are a form of outdoor cooking and are often used in situations where minimal fuel consumption is important, or the danger of accidental fires is high. General images -The following are images from various renewable energy-related articles on Wikipedia.
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![Image 25Concentrated solar panels are getting a power boost. Pacific Northwest National Laboratory (PNNL) will be testing a new concentrated solar power system – one that can help natural gas power plants reduce their fuel usage by up to 20 percent.[needs update] (from Solar energy)](/index.php?title=Special:Upload&wpDestFile=Photo_of_the_Week-_Boosting_Solar_Technology_(8722948189).jpg){kind=link}
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