The prediction of experts indicates that the next five to ten years in Croatia will be characterized by a significant increase in the number of installed solar power plants and their integration into both the transmission and distribution electrical power grids, depending on the installed nominal capacity of each project. This paper provides an overview of the development process of a solar power plant with a nominal capacity of 9.99 MW from two distinct perspectives. The first perspective addresses the steps related to legal administration and specific permits that correspond to each phase of the project, while the second perspective focuses on the practical design and engineering of the solar power plant. This includes emphasizing technical feasibility, components, functionality, as well as the economic aspect of the project, utilizing specialized software designed for solar energy projects, specifically solar power plants. The purpose of this paper is to provide insights into understanding the key steps, factors, and risks necessary for the design, planning, and successful grid integration of such renewable energy projects. Among other aspects, the paper examines the site selection for the power plant, the selection of appropriate equipment including photovoltaic panels, inverters, grid connection methods, and presents a basic financial analysis required to realize this project. It also projects the anticipated annual production, revenue, and return on investment. This paper offers guidance for sound planning and realization of a "greenfield" solar power plant project, in accordance with current existing regulations in Croatia. It underscores technical viability, financial foundation, and existing legal constraints, all with the objective of contributing to addressing global challenges and the transition toward a green and sustainable energy future as defined by the European Green Deal document which is one of the most ambitious and complex projects and goals of the European Union for both the short and long term period.