In this final work, a solar power plant connected to the power grid is shown. As an introduction to the work, the construction plot on which construction is planned is described. An analysis of electricity costs in the following year is made to calculate the economic viability of the project. The procedure for obtaining all the necessary permits, as well as the construction phase, from the beginning of the construction and electrical works to the final conclusion of the contract. Navalis d.o.o. was founded in 2000 with the headquarters in Split. The primary activity of the company is the development of project and works documentation for different types of ships. In addition to producing documentation, in its plant in Bjelovar the company offers the production of metal constructions and pipelines for the needs of the shipbuilding industry. By increasing the production volume, the need to use electricity increases proportionally, which leads to higher costs. As a permanent solution, a direct agreement was made to build a network solar power plant with power of 30KW - in continuation IH-30KW. Network solar power plant works as a supplement to the electricity network of the Croatian Electric Power Company in such a way that during sunny days the surplus electricity flows to the grid and in the cloudy weather, when the power plant can´t develop its full capacity, it takes electricity from the Croatian Power Company network.