By focusing the supply side of the electric utility in 2030, the prospect of the Electric Utility Council in 2010 was viewed using a simple linear plan model. The cost and technical conditions of each power supply were entered to guess the optimum power configuration from the viewpoint of the cost minimum. As a result, the following conclusion was obtained. To keep the CO2 discharge in 2030 to the level in 1990, the nuclear equipment should be set to about 100,000,000 kW. If the equipment capacity is within 70,000,000 kW, the absorption cost (amine absorption is supposed) of CO2 exceeding an upper limit of 90,000,000 tons reaches about 565,000,000,000 yen. If the photovoltaic power generation is installed for each house without a storage battery, the load factor decreases and the generating cost increases because the equipment capacity at dusk and night is required. With the spread of an electric car, the load for night charging also increases. Therefore, the nuclear equipment capacity reaches about 130,000,000 kW, but the generating cost decreases. 14 figs., 2 tabs.