Ami Bangladeshi

Ami Bangladeshi

Ami Bangladeshi

Alternate energy..

Wind energy is a very abundant resource. This has been used for many centuries for milling wheat and pumping water, but only recently is has become a world wide energy solution to generate electricity.

  • Since 2000, the production of electricity from wind has increased by over 400%. World wide it generates 74,223 MW. This is only 1% of the world’s electricity but 20% in Denmark and 7% in Germany who are taking a lead role in this energy form.

  • This has been used at 5 main sites in New Zealand to generate significant power –White Hill – 30,000 homes, Tararua      – 32,000 homes, Te Apiti      – 45,000 households, Hau Nui       -4200 homes Te Rere Hau –18,000 households.  

  • At the moment there are 40 wind farms in construction, operating or being proposed in New Zealand. There is a proposal for a large site in Central Otago, although it has been made difficult by different opposing groups. 

  • At the end of 2006 New Zealand generated 171MW.

 

  • Turbines can be placed in a variety of locations. In New Zealand they are often on ridge lines to get the full wind force. They can also be on coastlines to generate from the Sea Breeze cause by convection from heating of the land and sea. But offshore is becoming more popular- especially in Denmark. Because water has less surface roughness than land, the average wind speed is usually considerably higher over open water.

  • Offshore turbines require shorter towers, also making them less visible.   

  • Installation of turbines, like most other energy generation plants requires a high capital cost. But once the capital cost has been in invested in wind turbines, there are very low ongoing costs, they don’t require fuel like coal fired stations.

  • A key issue debated about wind power is its ability of meet large scale requirements and if it can meet a substantial portion of the world's energy demands. There are significant technical, economic and ecological issues about the large-scale use of wind power that may limit its ability to replace other forms of energy production.

  • Electricity generated from wind power can be highly variable; wind is largely due to the sun, so from night to day the wind can change and also seasonal change.

  • As explained with sea Generation, excess power can be used to produce hydrogen. Hydrogen takes considerable energy to produce - it takes 50kw/hrs to produce 1 kg hydrogen so this would good consumption for surplus energy. Energy can be stored as potential energy by pumping water, stored in huge batteries or in mechanical movement using Flywheels. Interestingly enough in the 1950’s buses in Switzerland were powered by potential energy stored in flywheels. It is hoped that flywheel systems will replace existing chemical batteries.

 

Wind is a renewable resource and it isn’t going to run out- likely to increase with global warming. The benefit with wind in New Zealand is that it is often delivered close to where it is needed, so some 20% of the energy isn’t wasted like other generation forms.   

If you haven't been to a wind turbine, I strongly suggest a visit, they are absolutely fantastic machines.

 

Click for a movie of the Gebbies Pass turbine-Christchurch NZ.or right click and save target as

 

                                                                                                                                                                                                                           

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