ERAMET Comilog Manganèse is currently the world's 2nd-largest producer of manganese alloys for steelmaking, and the company has adopted very strict policy for environmental impact. This includes drastic control on polluting emission but also constant energy consumption reduction. A systematic investigation of the energy flow through the production plants has been performed. Particular attention was paid the furnaces as they the largest energy consumer on the site. The analysis showed that the large amount of energy is available as chemical energy in the CO rich exhaust gas. Recovering this energy is relatively easy as the technology is mature and is already being done at one of the Norwegian plants. Some plants, situated in the neighborhood of other industry, also sell this CO rich gas. For the plants with no industry nearby, the challenge is to find the economy for the investment for electric energy production plant. The major part of the rest of the energy sources available on the sites are thermal energy in solid materials like metal and slag, or low temperature fluids. These energy sources are more challenging to recover. © 2020 INFACON.All rights reserved.