Renewable energy refers to energy resources obtained from natural processes that can be renewed on an ongoing basis. The main sources of renewable energy include sunlight, wind, water, biomass and geothermal. With increasing awareness of climate change and declining fossil energy reserves, the transition to renewable energy is increasingly urgent. Solar power (solar energy) is one of the most developed forms of renewable energy. Solar panel technology has progressed rapidly, making installation costs increasingly affordable. In addition, solar energy has great potential for use at various levels, from households to large power plants. Wind energy also plays an important role in the global energy transition. Wind turbines, which can be installed on land or at sea, harness the power of the wind to generate electricity. Countries such as Denmark and Germany have successfully integrated wind energy into their electricity grids, showing that with the right policies, renewable energy can reduce dependence on fossil fuels. Hydropower or hydro energy is obtained from water flow, either from rivers or reservoirs. It is one of the oldest and most dominant renewable energy sources in the world. However, dam construction can have significant environmental impacts, so sustainable management is key. Biomass and geothermal energy also offer other solutions. Biomass, which comes from organic waste, can be converted into energy through combustion or fermentation processes. Meanwhile, geothermal energy uses heat from within the earth to produce electricity and heating. This is a very efficient option, especially in areas close to geothermal activity. The transition to renewable energy not only impacts the environment, but also offers economic benefits. Investments in green technology create new jobs, increase local economic growth, and reduce energy costs in the long term. Additionally, various government incentives for renewable energy are making businesses and individuals more motivated to invest in sustainable solutions. However, challenges such as energy storage and grid integration must be overcome to maximize the potential of renewable energy. Storage technologies, such as lithium-ion batteries, are increasingly affordable and efficient, allowing renewable energy to be available when it is needed, not just when the source is available. Public awareness and political support also play an important role in facilitating this change. Education about the importance of renewable energy must be strengthened, so that people understand the benefits offered and are involved in this transition. Additionally, supportive policies and incentives for renewable energy can help accelerate this transition at a global level. In conclusion, renewable energy is not just an alternative, but is the main solution to world energy challenges. Through innovation and joint support, a bright future with clean and sustainable energy is no longer a dream, but a reality that can be realized.