Do you mean types of energy sources? As in having the options to create fuel and electricity through biomass or electricity production through solar, wind, water, and geothermal means?
It is important to have different types of energy sources because different regions of the Earth have different climate and geological features that affect the options for energy production. For example, American solar power would best be utilized by the southwest region because it receives a good amount of sunlight. Windfarms are also set up in the mid-west and in open areas at the bases of mountains because wind is highly accessible in such regions. Also, different methods of energy production have different costs for production and different prices to sell to consumers at. Energy producers of a specific region can utilize the most available energy sources and sell them to consumer at more affordable prices.
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