Wind power has been one of the main sources of renewable energy over the past years.  This means that it is far more developed than other kinds of renewable energy sources.  In this article, the positives and negatives of wind power are discussed.  Wind power has become increasingly efficient as a source of electricity, and plans are being created to increase this efficiency even more.  One of the main advantages of wind power is its ability to be used everywhere, even in the middle of the ocean.  It is also a much cheaper source of renewable energy.  One of the main disadvantages of wind power is that it cannot always be controlled and does not always work when it is needed.  Wind power is only available about 40% of the year, whereas fossil-fuel powered plants are available about 90% of the time.  New blade designs are being worked on to solve this problem.  They would also like to try and store the energy created from the wind power into batteries to harvest the wind power and be able to use it, even when no power is currently being produced.