太陽光発電システム普及時の余剰電力の買電単価と売電単価の試算

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タイトル別名
  • Estimation of Purchase Price and Sale Price of Surplus Electricity under the Diffusion of Photovoltaic Systems
  • 太陽光発電システム普及時の余剰電力の買電単位と売電単位の試算
  • タイヨウコウ ハツデン システム フキュウジ ノ ヨジョウ デンリョク ノ バイデンタンイ ト バイデンタンイ ノ シサン

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The surplus electricity generated in the residential photovoltaic (PV) system is sold by a customer and purchased by a utility. So the purchase and the sale prices influence the diffusion of PV system. In this paper, the purchase price and the sale price are calculated from the utility and the customer sides, respectively. Parameters are future years (2005, 2015, 2025) and the diffusion ratio of PV system (0, 2, 4, 6, 8, 10%). First, from viewpoint of the utility side, the optimum mix of electric generation sources and the generation curves are calculated using the linear programming method. The result leads to the purchase price at which the utility makes a profit. A representative result shows the purchase price has to be lower than 8.2 yen/kWh in case of the diffusion ratio being 10% and the year being 2025. Next, from viewpoint of the customer side, the PV system cost and the electricity charge are calculated supposing that the PV system cost decreases with increasing of the annual productivity of PV module and the existing electric charge system remains to 2025. The result leads to the sale price at which the customer makes a profit. A representative results show that the sale price has to be higher than 13.8 yen/kWh at the same parameter as above. It is concluded that a carbon or environmental taxes are necessary to fill up this big gap between the purchase (utility) and the sale (customer) prices.

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