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PHOTOVOLTAIC SYSTEMS
WIND ENERGY
NATURE'S ENERGY
  • PHOTOVOLTAIC SYSTEMS

    PHOTOVOLTAIC SYSTEMS

  • WIND ENERGY

    WIND ENERGY

  • NATURE'S ENERGY

    NATURE'S ENERGY

WIND ENERGY

fotoboltaika_b

Wind power is the conversion of wind energy into a useful form of energy, such as using wind turbines to make electricity, windmills for mechanical power, windpumps for water pumping or drainage, or sails to propel ships. Wind power, as an alternative to fossil fuels, is plentiful, renewable, widely distributed, clean, and produces no greenhouse gas emissions during operation. A large wind farm may consist of several hundred individual wind turbines which are connected to the electric power transmission network. At the end of 2010, worldwide nameplate capacity of wind-powered generators was 197 gigawatts (GW).

 

Wind energy


The Earth is unevenly heated by the sun, such that the poles receive less energy from the sun than the equator; along with this, dry land heats up (and cools down) more quickly than the seas do. The differential heating drives a global atmospheric convection system reaching from the Earth's surface to the stratosphere which acts as a virtual ceiling. Most of the energy stored in these wind movements can be found at high altitudes where continuous wind speeds of over 160 km/h (99 mph) occur. Eventually, the wind energy is converted through friction into diffuse heat throughout the Earth's surface and the atmosphere.

 

The total amount of economically extractable power available from the wind is considerably more than present human power use from all sources.[12] The most comprehensive study as of 2005[13] found the potential of wind power on land and near-shore to be 72 TW, equivalent to 54,000 MToE (million tons of oil equivalent) per year, or over five times the world's current energy use in all forms. The potential takes into account only locations with mean annual wind speeds ≥ 6.9 m/s at 80 m. The study assumes six 1.5 megawatt, 77 m diameter turbines per square kilometer on roughly 13% of the total global land area (though that land would also be available for other compatible uses such as farming). The authors acknowledge that many practical barriers would need to be overcome to reach this theoretical capacity.

 

The practical limit to exploitation of wind power will be set by economic and environmental factors, since the resource available is far larger than any practical means to develop it.

 


Wind power in Greece is about to expand by 352% by 2010 to meet the European target of 20% coverage of energy needs from renewable sources. Currently there are 1,028 wind turbines installed throughout Greece and the number is set to reach 2,587 wind turbines before the end of 2010.

 

According to the Ministry of Environment and Public Works, the system will have a nameplate capacity of 3,372MW of power from wind alone compared to 746MW at the end of 2006. Greece chose to invest primarily to wind power by 77%, while the rest of renewable sources altogether comprise the remaining 23% of production with hydroelectric power being second with 11%.

NET METERING

Τι προβλέπει το νέο θεσμικό πλαίσιο για την εφαρμογή του net‐metering;
Εδώ θα βρείτε όλες τις απαραίτητες πληροφορίες.

 

PRESS RELEASE

Law to accelerate the development of Renewable Energy Sources to address climate change.

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