Water is pumped into a geothermal vent and heated to steam, which then drives a steam turbine. Water passes through a sluice gate on a dam, turning a water turbine. Wind turns electric generators. All three have a turning motor as there method of generating electricity. However, only geothermal and water have potential energy reserves that can be tapped at any time. Wind is variable, and so cannot be trusted to be a backbone for electrical grid. People will not tolerate insecure electrical delivery, and brown outs will the reason for consumers to complain.