This isn’t actually true, the amount of kinetic energy in a rotating wind turbine is roughly the same when normalized by its power output as a typical conventional power plant. The issue is that the current wind farms aren’t set up to use this kinetic energy for frequency control. (Wind turbines used to be synchronous machines just like conventional power plants, but advances in power electronics allowed wind turbines to be variable speed, which allows them to change their rotational speed with the wind speed for better efficiency)<br><br>There are some proposed controllers that allow for the wind turbine rotational kinetic energy to be used for frequency response, but the current payment model for wind farms doesn’t support this function. <br><br>TLDR: wind turbines could be set up for frequency response, but operators won’t be paid for it so why do it.,(reply>), I think synthetic inertia is required from wind turbines from Hydro-Québec and deloading is required by various countries, at least in Europe (Ireland, Denmark, Spain...). I'm not sure, so verify it yourself if you want. Yes, the inertia constant H is roughly equal to synchronous generators but it is calculated for rated rotational speed, wind turbines often operate at lower rotational speeds (following MPP curve) and the rotational speed is usually limited at somewhere about 0,7 p.u., so stored kinetic energy can vary extensively.