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With wind energy, we can save money over the long term. And unlike conventional fossil fuels, wind energy produce little or no carbon dioxide (CO2), which is a harmful gas and one of the biggest causes of climate change now.

Living green with wind energy sounds great! But we need to pay attention to some points. Wind speed will affect the amount of energy produced. But wind speed will increase with height. 

The small wind turbines can be roof mounted for having a green home.
Below shows that wind turbine roof mounted:
 

But how do this small wind turbines work?

What's wind power? in brief, wind power includes the following formats: 1. using wind turbines to make electricity, 2. using wind mills for mechanical power, 3. using wind pumps for pumping water or drainage, 4. sails to propel ships...

:-) In fact, in the application of green energy, we often noticed this: wind energy and solar power are combined together for powering. For example, in some cities, solar street lights are mainly powered with solar energy, but still with small wind turbine. That means some solar street lights use wind power too.

First of all, wind energy do not generate air or water emissions,  and don't produce any hazardous waste. And wind power don't use natural resources such as coal, oil, or gas, won't cause environmental damage through resource extraction and transportation, don't require significant amounts of water during operation.
 

We can use more wind energy to prevent global warming.

But in fact wind power plants, like all other energy technologies, have some environmental impacts too.

Wind turbines don't consume any fuel or produce pollution during their normal operation, but still have hazards associated with their construction and operation. There are about 40 fatalities due to construction, operation, maintenance of wind turbines

Solar water heaters, also called solar domestic hot water systems, is a cost-effective way to generate hot water for your home. Solar water heaters (solar domestic hot water systems) can be used in any climate, but different types of solar water heaters work best in different areas, and they use free sunshine. This will cut your bill for electricity.

Solar water heater includes two main parts: storage tanks and solar collectors. There are active solar water heating systems and passive solar water heating systems. The active ones have circulating pumps and controls, but the passive solar water heating systems don't. In fact there are many suppliers of solar water heaters in China. They perform differently mainly because of this.

According to the statistics, before October, 2009, there are about 50 companies, which are constructing , expanding, or preparing to construct the production line of multicrystalline (poly-crystalline) silicon in more than 20 provinces in China. The scale of the construction for multicrystalline (poly-crystalline) silicon is 50,000 tons to 100,000 tons.

Regarding the wind power, there are about 70 manufacturers of wind energy now for just several years in Chna. But in fact the demands for wind power in the market of China, the capacity of the first 3 manufacturers are enough fully. That means other 67 manufacturers can't find enough demands of the market for their wind power.

 

But this is not the most serious problem these companies of renewable energy face.

This biggest problem is off-grid (stand-alone) for these clean energy (solar power, wind energy).

China consumes 10% of the world's total energy (power). 70 per cent of its primary energy consumption was coal. This is 40% higher than the world average.

The SO2 pollution caused by coal burning accounted for 70% to 80% of the total emission amount. Furthermore, the acid rain triggered by SO2 covers 1/3 of the entire area of China.

The quality of the environment in China is continuously deteriorating. By the end of 2020 the environmental and health losses of China caused by air pollution will reach 13% of the total GDP value. Therefore, the development of clean energy (green energy, alternative energy) has become the inevitable choice of China’s energy strategy. In fact the Chinese government has annouced a lot of policies about clean energy (green energy, alternative energy, renewable energy) and will plan to stimulate the development of clean energy. These include laws about green energy, subsidies for clean energy. For example, China Solar Subsidies -- “Golden Sun” subsidies , Carrot for solar power development offered by China government .

Wind power (wind energy), compared with conventional energy, is sustainable and is a form of clean energy (green power). Generating power from the wind does not require the burning of fossil fuels; hence, there is no risk of a fuel price rise.

top 10 wind power markets 2004:

Additionally, there are no environmental costs, such as carbon emissions.

According to a Harvard University study, global wind energy (wind power) potential is considerably higher than previous estimates by both wind industry groups and government agencies.

Using data from thousands of meteorological stations, the Harvard University team estimated that the world potential of wind power (wind energy) to be 40 times greater than total current power consumption. The interesting fact is that the previous study cited in the paper put that multiple at about 7 times.

Remote regions of Russia and Canada have the greatest theoretical potential. And also there are real gains to be made in high-emission nations, especially China, which has been rapidly constructing coal plants. “Large-scale development of wind power (wind energy) in China could allow for an 18-fold increase in electricity supply relative to consumption reported for 2005,” the Harvard University study shows.

The development of wind energy in China has been put on the fast road. Many companies have focused on wind energy. Much money has been invested on the project of wind energy (wind power). Is it good news? is it a miracle for green energy (alternative energy)? or just an investment bubble on wind power?

The western areas of China, such as Gansu, Inner Mongolia is rich for the resource of wind energy. Meanwhile, these areas are poor. If these investment on wind energy in these poor areas is just to develop the green energy (renewable energy, alternative energy), not an investment bubble, surely, it will stimulate the development of these areas and will bring many benefits to the people living in those areas, such as solving the employment, making them richer (or exactly not so poor).

In our last article about wind power market in the US, the US wind energy market will see a surge in 2010. And some researches show that China could at least double its current wind energy (wind power) target for 2020.

A few years ago, Energy Bureau Director of the National Development and Reform Commission (NDRC), Xu Dingming said: “The development of renewable energy plays a crucial strategic role in the power supply of China. Wind energy growth in China is now on a fast track and globally we believe that wind power will become the primary alternative energy in the future.”

According to one report, China’s current wind energy (wind power) plan is to reach 20 Gigawatts (GW) by 2020. And we know that Germany, the world wind energy leader today, has just under 17GW. But the experts within the Chinese wind energy industry believe that 40 Gigawatts (GW) can be delivered in 2020; rising to ten times this by 2050. This scale of wind power would need 20,000 typical modern wind turbines by 2020. The investment generated could be worth USD 40 billion; putting China on track to become the world’s biggest wind energy market by 2020.

Let's put our eyes on China's total wind energy resources.

The capacity of wind potential in viable windy locations in China is large enough.
 

2009 wind energy (wind power) capacity additions in the USA could drop to 6.5 GW in 2009 – down 24% from the record year 2008, but that 2010 could see a re-bound of 9 GW of new wind additions, and another 11 GW in 2011.

And some analysts believe that by 2020 the US could see wind power (wind energy) growth of 15.5 GW.

"The US wind industry may post its strongest year ever in 2010 when the incentive-laced economic stimulus begins to show returns and transmission build-out reaches market,” says Emerging Energy Research (EER) Senior Analyst, Matthew Kaplan.

	1	<200	<5.6
	2	200-300	5.6-6.4
	3	300-400	6.4-7.0
	4	400-500	7.0-7.5
	5	500-600	7.5-8.0
	6	600-800	8.0-8.8
	7	>800	>8.8
	*Equivalent wind speed at sea level for a Rayleigh Distribution