Renewable energy is one of the quickest and largest-grown energy sources for the generation of electricity. Many states in the United States were already started use them to replace the enormous amount of use of coal. However by gaining the using of the renewable energy, each states needed to start build up more and more grids to maintain these electricity. One best example is California. As the article described, California is one of those states which took the first step to use more renewable energy such as wind and solar energy. It is not difficult to see the good side of using these renewable energy: the emission of California went down dramatically over these years. However the down side of these renewable sources is also pretty clear,
