2018-10-04: Research published today suggests that the power available from wind is much more limited than many experts thought, and that deployment on a larger scale could significantly raise temperatures over the Earth’s surface, as turbines alter atmospheric flows. The research highlights a painful but not altogether surprising reality: Even the cleanest renewable technologies come with environmental costs.
Research found that wind plants encompassing the largest areas had the lowest power densities, as expected. This figure implies that meeting current U.S. electricity needs alone would require wind farms to cover fully 12 percent of the U.S. land area. Wind power has physical limitations.
Miller and Keith found something even more surprising in another study that looked at a related question: What should we expect the climate impact of significant wind energy generation to be? Removing energy from atmospheric winds means those winds carry less energy afterward, moving more slowly, among other things.
simulations revealed that interactions of the turbines with the atmosphere would likely lead to a redistribution of heat in the lower atmosphere, resulting in a 0.54 degrees Celsius (0.97 degrees Fahrenheit) warming within the wind farms’ region itself, and an increase of 0.24 degrees Celsius (0.43 degrees Fahrenheit) over the continental U.S. This result, they note, actually matches up pretty well with recent satellite observations of local warming around wind farms operating in California, Illinois, Iowa and Texas. They also found that an expansive wind farm would need to operate for more than a century or so before the reduction of global carbon dioxide emissions would offset the local warming effect.
Miller and Keith also looked at U.S. solar farms, finding an achieved energy density about 10 times higher than for wind farms. Solar arrays in their study also led to much less local warming. There may be a good reason to shift future investments toward solar energy, as some big investors are doing already.
Dutch company claims to have a wind turbine that is 80% more efficient than existent turbines.
The Vortex, a radical new way to generate wind energy, is a bladeless wind turbine that looks like a giant rolled joint shooting into the sky.
The design of a new type of bladeless wind turbine is claimed to be both bird- and bat-friendly, while also being inexpensive and efficient.
The Sheerwind wind turbine promises to produce 6 times the electrical power than traditional wind turbines. This funny looking wind tower acts like a funnel, directing the wind from any angle, down through a tube to a ground based turbine generator. The funneling of the wind through a narrow passage effectively creates a "jet effect" increasing the
Companies such as Google race to invent flying wind turbines to bring life-changing electricity to isolated areas worldwide.
Smantellamento Continueremo a pagare fino al 2021 per lo smantellamento delle centrali atomiche
Dovrebbe diventare operativa nel 2017
Fino a qualche anno fa il Monte Mindino, nelle Alpi Liguri, era soprattutto conosciuto come facile e panoramica gita di scialpinismo. Poi ecco che è diventato oggetto di un enorme progetto di realizzazione di parco eolico. Ed è iniziata una lunga battaglia fra chi difendeva la natura e chi voleva usarla. Massimo Allamandola e Luca
Day-ahead power in Germany turned negative for the first time in at least five years as utilities prefer to pay users rather than halt plants amid low demand, mild temperatures and higher-than-average wind generation.
Possibili fino 2.200 terawatt: il fabbisogno energetico mondiale attuale 232 di 18 TW