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This DNV GL standard provides principles, technical requirements and guidance for loads and site conditions of wind turbines. For the first time, the requirements for onshore and bottom mounted offshore wind turbines are defined consistently and concisely in a single document. The definition of offshore turbulence classes has been revised significantly to include turbulence distributions adapted to the offshore environment. In addition marine parameters have been included to define offshore type classes which may be used for the type certification of an offshore rotor-nacelle assembly (RNA) and sub-structure. Based on more than three decades of experience as standard setter and certification body in the wind industry, this standard fills gaps and provides clarity and additional guidance, where existing standards lack such guidance. The requirements of this standard focus on reaching the intended safety level in an economic way. Where the intended safety level could have been reached in several ways, the requirements of this standard have in general been aligned with requirements of other international standards, in particular with the IEC 61400 series of standards. This standard has been developed and updated by DNV GL and undergoes external hearing by the committee of experts and other external stakeholders prior to publication as part of the quality assurance process. This standard is checked regularly to ensure its content is in accordance with the state of the art. It will be updated to keep it current and to ensure appropriate coverage in areas of ongoing technological development. The standard has been written for world-wide application. National and governmental regulations may include requirements in excess of the provisions given in this standard. The DNV GL wind turbine standards as listed in Table 1-1 have been aligned technically, regarding the provided safety level and their requirements. Along with the DNV GL service documents as listed in Table 1-1 they form the most comprehensive basis for the design and certification of wind turbines and wind farms. The standard contains five sections: Sec.1 gives an introduction and provides context towards other DNV GL standards and service specifications and towards other existing loads standards. Sec.2 covers external conditions relevant for the loads of wind turbines. External conditions for onshore wind turbines are identical to those in IEC 61400-1, whereas marine conditions are covered in depth in this standard and refer partly to IEC 61400-3. Sec.3 covers site conditions and requirements for determining site specific design conditions as part of the design basis. Sec.4 covers the calculation of loads, including different sources of loading, safety factors, load case definitions and evaluation of loads. Sec.5 covers requirements for type testing, in particular regarding verification of design loads through comparison of simulations and measurements.