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Today, a large amount of electrical energy is used in the ferronickel production facilities of Feni Industries, in order to melt the ore used in their production process. An important issue however is that after the end of the production process, the residual energy is released in the open air as waste heat. On this basis, the purpose of the Thesis is to map possible practices dealing with the recovery of this energy, while identifying how the company’s sustainability could be improved if these energy recovery practices are implemented. The first part of the Thesis involves introduction in which is described in general the importance of sustainability for companies today. Defining sustainability as satisfying todays needs with no compromising the needs of future generations, it is stressed out that modern companies in order to provide a long term value, must include sustainability goals in the core of the strategy of the company. Furthermore, is described the importance of corporate social responsibility, and expectation of community from corporations to contribute to economic development while improving the quality of life of the employees and their families as well as of the local community and society. Then we focus on the energy recovery as pivotal environmental practice and conclude with stating the purpose of this thesis for identifying and proposing solutions for energy recovery. The second part of the Thesis involves literature review of sustainability as a process and also literature review for energy recovery. We are providing theories, thesis and literature in which is discussed the process of energy recovery. ii The third part of the Thesis is methodology, in which are briefly described methods that has been used for research for the thesis. Mostly are used qualitative methods of research, with mostly used secondary data and partially obtained primary data. We are using case study for Feni Industries to present the opportunities for solving the problem. The fourth part is the findings and analysis of the research that has been conducted. In this part first is described the supply chain network of the case study of Feni Industries. There is mapping of the sourcing of inputs needed in production process, and also outputs delivered for the customers which in our case study are companies that are using our finished goods as raw material in their production process. The mapping of supply chain network is only introduction, to see the global picture of the company, and identify the parts with most significant footprint on the environment, but also and most potential parts for recovering energy. Then we narrow down in identifying the opportunities in the company to enhance the sustainability, and waste heat sources in the plant are most perspective. As the most potential source to recover energy is the waste heat released from the slag, which is residual from the production process. The slag temperature at exit of the process is 1650⁰C. Considering the quantity of over 1 million tons per year, we could see the potential energy that could be recovered. There is financial analysis of the costs and benefits of implementing a solution to capture the thermal energy of the slag and commercial use of it. The fifth and last part is describing the conclusions of the thesis. Implementing solution for recovery of the energy contained in the slag would have a multiple benefits for the company. By searching and implementation of energy recovery practices, not only that companies will improve their sustainability but also will reduce its cost of operation and be more competitive on the market.