The development of a smart grid that integrates intermittent renewable energy sources (RES) such as solar and wind power poses a significant challenge due to high investment costs for balancing the network. Strategies for integrating these sources must be carefully considered to ensure grid stability and reliability. Additionally, reducing connection power is crucial in enhancing the efficiency of the system while minimizing costs. To economically justify the consumption and production of reduced emissions,rigorous economic analysis is necessary to evaluate the cost-effectiveness of different energy alternatives. In this study, the TIMES linear optimisation model is used to conduct optimization based on economically justified production and reduced emissions. The comparison is made between two alternatives: establishing hydrogen plants interlinked with wind turbines and solar panels and establishing energy communities. The Base scenario assumes the traditional energy system with a traditional connection scheme. The reduced emissions scenario analyses the energy communities with increased use of surplus energy and partially independent energy supply. It is essential to replace inefficient and fossil-based individual heating solutions with the energy system of the energy community. The third scenario is the hydrogen production and accumulation scenario, which foresees different hydrogen pathways, such as direct use in energy communities, production of fuel cells for district heating, and export of surplus hydrogen. It is crucial to consider the implications of each scenario on the local energy demand and supply, community preferences and policies, and environmental impact. Therefore, comprehensive analyses and evaluations are necessary to identify the optimum location for establishing energy community systems. The study results provide insights into the potential economic and environmental benefits of utilizing renewable energy sources in smart energy systems under various conditions and technical solutions.