This work concerns the preliminary project for the sizing of a thermal power station with emergency generators capable of supplying electrical energy to the Kamoa concentrator located in kakula. The Kakula concentrator, beneficiary of this preliminery project is a plant that concentrates the ore coming from the Kakula mine and having a grade of 5%. After treatement, a copper concentrate of about 55% is obtained and transported for sale. For the choice of generators, the most important element was the determination of the power to be supplied. To do this, we based ourselves on some principales of general electricity. The results enabled us to choose thirteen (13) generators of 4500 kVA of the brand SDMO that we coupled in parallel to obtain a power of 58500 kVA. Then, we chose a 50 MVA transformer to raise the 11 kV voltage produced by generators to a voltage of 33 kV which must be available on the main busbar of the plant. In the end, we proposed a general scheme of the plant with an automatic start system for the generators using an inverter.