World widely speaking, power industry plays an important player in the carbon emission and the carbon emission reduction field, and it is also the main part of the carbon trade market. Carbon constraint in electricity market will profoundly transform the original model of the power generation and electricity trade, and market behavior of every part in electric power market will be substantially changed. In this paper, the impact that carbon emission trade on electricity companies is mainly analyzed. First, optimum background for purchasing electricity of Shenzhen grid is analyzed. Next, optimization method for grid purchasing electricity is analyzed based on data of Shenzhen grid's purchasing electricity. It turns out that Optimization method can offer reliable strategies for grid enterprises purchasing electricity.
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