The amount of wind energy income available is complicated. There are up two main components that make up the total value of electricity generated, namely:. Each of these components is described in more detail here along with information on how they can affect the overall value of the energy generated. The greatest income can be achieved if the electricity generated is consumed on site rather than being exported to the grid. The greater proportion of energy consumed, the higher the income. This is further complicated by the rising cost of electricity. The graph below shows historical price rises for non domestic electricity between and