This chapter explains how a wind power plant is interconnected with an electric grid to deliver power to the load. It also explains how a modern utility‐scale wind turbine operates, what its major components are and how it converts energy in the wind into electrical energy delivered to the utility grid. The wind blows may vary in speed and direction, and it may blow as a steady breeze or in turbulent gusts, but the characterization of wind is important if one has the objective to produce energy from a wind turbine. Differential heating of the Earth's atmosphere by the Sun between the equator and the poles is a major driving force for wind circulation. If one places a wind anemometer on a meteorological tower at a given location and continuously records the output of the anemometer, one will observe a time record of wind speed.