Urban structure design and new energy technology could be minimizing energy consumption. By miniaturizing, improving the efficiency, and appropriately placing of supply system of energy equipment within the sight of the urban area, the consumption of energy may be minimized. To develop those urban environmental system, we must know the potential resource of new energy in urban area, local energy demand, the appropriate place to settle the system, or the more effective size of the system, and relationship between the different size of systems. The first step of consideration, we have studied a real case in the urban resident area-Makuhari Baytown. The area profile, energy flow of the district, and the effective area dimension of solar systems are discussed. As the result, a difference among levels in the amounts of potential energy is found, the effective energy supply system for each level should be considered