<p>In large-scale power plants, which are commonly used for concentrated production of electricity using fossil fuels, the global average efficiency falls below 40%. This means that more than two-thirds of the primary energy utilized for electricity generation is wasted as unused heat. Furthermore, during the transmission and distribution of electricity, around 9% of the net production in large power plants is lost, representing a third of the primary energy. To address these inefficiencies and conserve energy effectively, combined cycle power plant generation has emerged as a highly efficient approach. The electricity industry has witnessed the introduction of competition, enabling major industrial players such as those in Iran’s Mobarake Steel Industry, to construct smaller local power plants. This has expanded the options available for significant electricity consumers to fulfill their power requirements. The scientific aim of this work is to determine the optimal solution for efficient industrial electricity supply using data-driven technical and economic analyses. This article aims to evaluate and model the problem and identify the most efficient solution, accompanied by a concise overview of the necessary prerequisites. The proposed combined cycle system achieves an overall efficiency of 56%, an IRR of 22%, and a reduction of CO₂ emissions to 0.47 tons/MWh. The annual output is projected at 6 million MWh, confirming both economic and environmental benefits.</p>