Two years later, in 2013, the realization of the cogeneration project began (production of electric and thermal energy from gas obtained from oil and gas fields in Serbia). The first cogeneration facility was commissioned in Sirakovo, after which another 13 mini power plants were put into operation. The surplus of electric energy, produced by NIS, is since then sold on the free market. The company strives towards constant implementation of new technologies, thus in 2016 an Amin Plant for the purification of natural gas started operating within the Plant for the preparation and transport of oil and gas in Elemir. The second stage of the Pančevo Oil Refinery modernization has begun in 2017 with the construction of the bottom-of-the-barrel plant with delayed coking technology, with the intent to make Pančevo Oil Refinery one of the most modern in Eastern Europe.