Europe is currently facing a deep energy crisis, triggering significant impacts on the economy, society and the environment. One of the main causes of this crisis is the increasing dependence on fossil energy, especially natural gas, which is exacerbated by geopolitical tensions and supply uncertainty. In this context, the war in Ukraine has disrupted gas supplies from Russia, which is one of the main suppliers of energy to Europe. This crisis prompted European countries to look for alternative energy sources. Some countries have increased investment in renewable energy, such as wind and solar, to reduce dependence on fossil energy sources. This energy transition program not only aims to increase energy security, but also to fulfill climate change commitments under the Paris Agreement. However, the transition brings its own challenges. Many countries face difficulties in adopting new technologies quickly, especially in infrastructure and financing. For example, countries such as Germany and France have invested heavily in renewable energy projects, but the results have not been fully sufficient to replace the loss of natural gas supplies. The energy crisis also has a direct impact on people’s costs of living. Energy price spikes lead to increased inflation, affecting the costs of goods and services. In countries like the UK, gas and electricity prices are soaring, leading to fears that many households will struggle to pay their bills. This prompted the government to take emergency measures, including providing energy subsidies to vulnerable citizens. The impact of this crisis spread to the industrial sector, which experienced increased operating costs. Many companies, especially those that depend on large amounts of energy, have been forced to adjust production or even temporarily suspend their operations. The manufacturing, automotive and hospitality sectors have been the most affected, with many companies bracing for reduced demand from consumers shifting to more cost-effective consumption patterns. On the other hand, the energy crisis is also accelerating innovation in energy efficiency technology. Many companies are starting to invest in more sustainable solutions, such as energy-saving devices and advanced energy management systems, to reduce energy consumption and costs. Public involvement in energy saving campaigns is also increasing, in response to rising costs. The energy crisis in Europe is a reminder of the importance of diversifying energy sources, not only for economic stability but also for national security. With increasing geopolitical tensions, European countries must collaborate on creating long-term solutions that focus on energy security and sustainability, including building stronger energy supply networks and increasing the use of renewable energy. Awareness and active participation from society, the private sector and government are very important in facing this challenge.