The paper presents the actions taken by the TAURON Polska Energia SA (TAURON Group) in order to adapt the company to the requirements of the EU climate and energy policy and international agreements. Attention was paid to new investments in production capacities, including both conventional and renewable energy sources. The TAURON Group is a key player in the energy industry and an important link in the system of Polish energy security. It is the second largest integrated energy group in Poland, controlling the full value chain, from coal mining to sales to end clients. The TAURON Group’s assets include 5 coal-fired power plants, 3 coal-fired CHP plants, 4 wind farms and 35 hydroelectric power plants. The group continues to invest in coal power industry, though the currently developed power unit in the Jaworzno III power plant will be characterized by high efficiency and low emissions of NOx, SO2, CO2 and dust. Gas-fired power plants and wind farms are also under construction. According to the investment program adopted in the TAURON Group for the coming years, the area of renewable energy sources will gain in importance, which will particularly apply to the development of wind energy. As a result, the share of RES is expected to reach the target value of 800 MW (including biomass) by 2023. Therefore, the share of renewable energy sources – biomass, wind and water – in the production of energy in the TAURON Group is gradually increasing each year. Increasing the share of RES in the group’s portfolio is therefore one of the objectives set out in the Sustainable Development Strategy. According to its provisions, at least 10% of installed capacity will come from renewable sources by 2020. The units owned by the TAURON Group are undergoing thorough modernization. First and foremost, the company is investing in wind power plants, whose installed capacity has increased within a few years from 30.75 MW in 2011 to nearly 183 MW in 2013. What is more, the TAURON Group is also involved in a project to build Poland’s first nuclear power plant by acquiring a 10% stake of the PGE EJ1. The TAURON Polska Energia SA is attempting to implement the latest technology through its investment activities, which should lead to the production of cheap and clean electricity and heat using, among other things, own raw materials while taking care of the natural environment.