Welcome to the timely publication of this book entitled: “Renewable Energy; A direct train towards Sustainable Development”. Renewable energy is energy that is collected from renewable resources that are naturally replenished on a human timescale. It includes sources such as sunlight, wind, rain, tides, waves, and geothermal heat. Renewable energy stands in contrast to fossil fuels, which are being used far more quickly than they are being replenished. Although most renewable energy sources are sustainable, some are not. For example, some biomass sources are considered unsustainable at current rates of exploitation. Renewable energy often provides energy in four important areas: electricity generation, air and water heating/cooling, transportation, and rural (off-grid) energy services. About 20% of humans' global energy consumption is renewables, including almost 30% of electricity. About 8% of energy consumption is traditional biomass, but this is declining. Over 4% of energy consumption is heat energy from modern renewables, such as solar water heating, and over 6% electricity. Globally there are over 10 million jobs associated with the renewable energy industries, with solar photovoltaics being the largest renewable employer. Renewable energy systems are rapidly becoming more efficient and cheaper and their share of total energy consumption is increasing, with a large majority of worldwide newly installed electricity capacity being renewable. In most countries, photovoltaic solar or onshore wind are the cheapest new-build electricity. Sustainable development is an organizing principle for meeting human development goals while also sustaining the ability of natural systems to provide the natural resources and ecosystem services on which the economy and society depend. The desired result is a state of society where living conditions and resources are used to continue to meet human needs without undermining the integrity and stability of the natural system. Sustainable development can be defined as development that meets the needs of the present without compromising the ability of future generations to meet their own needs. While the modern concept of sustainable development is derived mostly from the 1987 Brundtland Report, it is also rooted in earlier ideas about sustainable forest management and 20th-century environmental concerns. As the concept of sustainable development developed, it has shifted its focus more towards the economic development, social development and environmental protection for future generations. The UN-level Sustainable Development Goals (2015-2030) address the global challenges, including poverty, inequality, climate change, environmental degradation, peace, and justice. New energies are expanding rapidly around the world. Cleanliness and cheapness can be considered as the two main indicators of new energy production, as these energies have been able to fill the gaps in fossil fuels in many places due to their high productivity. Energy experts believe that renewable energy should replace conventional energy sources such as oil and gas in the 21st century to reduce the wasteful use of hydrocarbon products and that future energy use depends on a structure in which carbon-free energy sources such as solar energy. Or wind to be used. A way to overcome the energy crisis and the time bomb that seems to be tuned to announce the end of energy at any moment. In the book in front of you, chapter by chapter, the types of renewable energy are examined and finally its advantages and even disadvantages are expressed! Having about 750 citations, all of which are well and completely addressed at the end of the book, shows my meticulousness and accuracy in using all the important sources in writing this book. I hope you like this book. In fact, we should listen to the proposal of the Saudi Minister of Energy in the 1970s, who said: "The Stone Age did not end because the stone ran out. The age of oil must end much sooner than the oil runs out." So Ladies and gentlemen! Welcome to the age of new Energies…