Having as motivation the greater concern of Brazil to insert alternative sources of energy in its matrix energy, this task has the objective to verify the economic feasibility for the implementation and operation of a solar power plant with 10 Mega-Watt capacity in the city of Limoeiro do Norte (CE). The analyzed period corresponds to the 20-year period of two electricity contracts applied in Brazil to solar energy sources. Upon the obtaining of daily historical data of solar radiation, this study is based on the generation of one thousand possible scenarios of solar power generation for the region. By applying the income conditions, reimbursements and fines of the contracts to amounts of energy generated, profit forecasts could be obtained for each scenario. Considering all the taxes imposed on the project and the acquisition of funding from the National Development Bank, this study uses the formula of Net Present Value (NPV) to justify or not the investment projects of solar power generation plants on the point of view of financial investor. Finally, this study concludes that according to estimates, the implementation of solar power plant in question is economically viable for both the energy contract in the regulated environment for availability as the reserve energy contract. The content of this work can be incorporated into projects in order to power generation from photovoltaic panels where the financial return is still doubtful. In this way, we seek to strengthen the knowledge of solar radiation as an energy source and contribute to the introduction of this source in the Brazilian energy matrix.