Hydropower, or water-power is power that is generated from the energy of moving water, which may be harnessed for many useful purposes.

Before the availability of commercial electric power became widespread, hydro power was used for irrigation, and used to operate various machines, such as watermills, textile machines, sawmills, dock cranes, and domestic lifts.

Hydropower is one of the oldest methods used to harness energy, and has been used for hundreds of years. Water wheels and watermills were built in India; water powered mills produced flour from grain in Imperial Rome, and were also used for sawing timber and stone.

The power generated from a wave of water released from a tank was used to extract the metal ores in a method known as hushing. This was extensively used in Britain in the Medieval and later periods to extract lead and tin ores. The same method later evolved into hydraulic mining when used during the California gold rush.

Coal is transported all around United States by train; according to figures almost 70% of coal in 2007 was transported around United States through railroad. Barges and trucks contribution for coal transportation is 11% while rest is delivered mainly by tramway, conveyor belt, or slurry pipeline.

Sometime coal is transported great distances. Such as, Powder River Basin coal is transported by rail to power plants as far away as Georgia. It travels a long way as far as the distance from Wyoming to Georgia.

To save the money from coal transportation costs there is a common way that using coal near the coal-mines. As soon as the coal is mined it’s delivered immediately to power plant through conveyor belt. Such plants are called “mine mouth” plants. The growing presence of mine mouth plants had eased by expanding use of long distance electricity transmission.

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Geothermal power plants use heat deep in the earth for the generation of steam, which in turn power generator for the generation of electricity. Geothermal heat pumps don’t generate electricity but these are used to transfer heat from the ground to reduce energy required to heat a building.

Working of Geothermal Power Plants

For the generation of electricity Geothermal power plants use much higher temperature deep within the earth, we can say that these power plants are much similar to coal or oil powered generators in which electricity is generated from steam driven turbines.

One of the main difference is that coal and oil powered plants burn fossil fuels to produce steam while the heat of the earth’s core is used by the geothermal power plants. Earth’s core is extremely hot and some areas are more suitable for the generation geothermal power from others depending upon that how far the surface of hot areas are located in the within the earth.

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There are many causes that lead to Global warming, with each of the reasons contributing more to the increasing intensity of the climate change that has affected our planet.

The main cause of global warming is the increase rate of greenhouse gases present in the earth’s atmosphere. These gases cause the the greenhouse effect, which traps the heat present on the earth by reducing the level of solar rays that are able to escape from our atmosphere.

Although the greenhouse effect is extremely important to support life on earth, by keeping our atmosphere warm enough to support life, the addition of human activities contributing to the quantity of greenhouse gases has caused an artificial increase in the intensity of the greenhouse effect, which has made this great phenomena a bad effect. Thus greenhouse effect is not bad, it is the increase in the amount of greenhouse gases that are causing the harm.

United States had burned 1.1 billion short tons of coal in 2007, that is enough to fill a railroad car every 3 seconds. Almost over 90% coal was burnt by electricity sector and rest was burned mostly in industrial and commercial settings. Burning vast quantity of coal by power plants relies on a vast network of mines where companies excel at extracting it from the Earth at prolific rates.

There is a simple principle for removing coal that just expose it, break it up, and cart it off to be burned. In fact practically coal mining is energy intensive, labor intensive and money intensive undertaking. One of the most risky occupations is the underground mining, killing and injuring many in accidents, and causing chronic health problems. Most of underground mining is done in the East and surface mining is done in the West.

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The aging energy infrastructure has caused Britain to face some serious power shortages in the next four years as warned by the Office of Gas and Electricity Markets (Ofgem), the United Kingdom’s chief energy regulator.

Due to the inadequate investment in renewable energy and the aging power plants that are scheduled for shut down in 2015, the country will be at the mercy of the volatile gas market.

After assessing four energy scenarios, Ofgem concluded that the UK will have to increase its gas imports by 2015, when coal-fired power plants are scheduled for shutdown.

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There are some huge, new power plants being installed all around the world. PG&E has contracted with a 250 MW and a 500 MW solar plant in California. Another 250 MW integrated solar plant/manufacturing facility is being built in India.

The Clinton Foundation has decided to build a similar 5,000 MW facility in a different part of India. At the beginning of the summer a new 10 MW thin-film facility was claiming the record for that category and a 400 MW solar thermal plant in the Mojave Desert was big news.

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Sweden’s deadline for phasing out nuclear power is 2010. Instead of working toward dismantling the 10 nuclear reactors it has, Sweden found it easier to change its stance. The declared that nuclear is green. They will keep their reactors and they have also lifted the ban on research in field of nuclear technology. It is likely that Swedish government will be funding projects for developing new more efficient power plants that generate low cost electricity.

Govt. knew that there would be an uproar from environmental protection groups. They tried to deal with it by a raise in carbon taxes, a promise to reduce carbon emissions by 40% by 2020 and bringing in the industries no covered under EU emission laws into carbon credit trading. The most remarkable promise Swedish government made is to adapt “Oil independence” and Zero  Emission as it goal in vision for 2050.

One thing that disappointed me most is that they have shamelessly set the target of 1% increase the share of renewable energy in total grid by 2020.

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