Growing concerns about greenhouse emissions have led to the increasing demand for clean and sustainable power sources. Wind energy is ideal for environment-friendly power generation. Lightweight composite materials help to harness wind energy with high efficiency. As a result, the demand for wind turbine composite materials is rising. The global wind industry is shifting toward larger turbines with longer blades, as larger blades are capable of producing higher amount of energy at low costs. Composite materials offer higher reliability and stability. Hence, these are of great importance in the manufacturing of parts of wind turbine, especially rotor blades. Fibers such as carbon fiber and glass fiber are majorly used in the global wind turbine composite materials market. Glass fibers are high in demand in turbine manufacturing. The most commonly used resins available in the market are polyester, epoxy, vinyl ester, polyurethane, and others. Wind turbine composite materials are used to manufacture hub, nacelle, rotor blade, and towers. Rotor blades are the most important component of a wind turbine. Properties of rotor blades determine the lifetime and performance of a turbine. In fact, rotor blades are the most expensive part of a wind turbine. Rotor blades constitutes the largest application segment of the global wind turbine composite materials market. The technology to manufacture rotor blades has evolved significantly in the last 20 years. Focus has been shifted to reduce cycle time, thereby lowering cost and probability of defects. New wind turbine composite materials are being studied to generate cost-effective wind energy.