If we individually see this word ‘ENERGY’ then we can say that "Energy is defined as the ability or the capacity to do work". And we use energy to do work and make all movements. When we eat, our bodies transform the food into energy to do work. When we run or walk or do some work, we ‘burn’ energy in our bodies. Cars, planes, trolleys, boats, and machinery also transform energy into work. Work means moving or lifting something, warming or lighting something. There are many sources of energy that help to run the various machines invented by man."Man has discover fire by burning wood for cooking and heating which we can say one type of energy and the use of energy.

For thousands of years we only used sun, water and wind power but in today’s world we are mainly depend on fossil power. As early as 4000-3500 BC, ships were running by wind energy. With the use of hydropower through water mills or irrigation systems, things began to move faster. In rural India still people are using fuel wood and dung cakes as major source of energy. Solar energy is used for drying and heating.

As industry grows, the use of energy in the form of fossil fuels began. It started with exploitation of coal to exploitation of oil. In early stage, we used coal, after that oil, and natural gas were in use as the main source of energy. Before half of century nuclear power began being used as an energy source. But as the usage increased it starts affecting environment.

Oil prices are increasing day by day because production is decreasing. And at the same time demand of the energy is also increasing and the price of natural gas, too, has risen. Therefore, Renewable Energy has grasp public, media, and political attention as a potential key to the critical concern of environment change.

There are many product projects which are commenced for constructing Renewable Energy Systems. Many companies which are in Energy business are inventing new ways to dig out Renewable Energy from renewable sources. In couple of next few years cost of oil will boost up. Oil supply may soon peak as utilization continues to grow, known supplies run out and new reserves turn out to be difficult to discover.

Prices of oil and natural gas have risen at the same time electricity is no longer chipper. If we compare Renewable Energy from wind and solar powered alternatives with available energy of oil and natural gas then no longer look so costly. Global warming, a long-range phenomenon, may not be uppermost in people’s minds during an economic downturn. Alternate energy may be costly now but will reduced to zero prices for the manufactures, so the costumer will get benefit from that also.

The most effective solution is to diversify our energy supplies at home. That means, to opening up areas to safe and environmentally responsible development and built more Renewable Energy Systems to support safe environment. Instead of paying for high prices of gas and oil imports we should use our own, clean domestic resources to fuel our own economy here like using solar and wind technologies.

Main weakness of Renewable Energy Systems is high initial cost of set up. Problem with Renewable Energy Systems is substantial investment for infrastructure to generate it. Current market of renewable energy is not as broad as gas and primary energy source has. High initial cost and scarcity of market are making Renewable Energy very costly for consumer.