It differs from day to day as it will depend on the size of the wind turbine and the wind speed. Take a a 2 MW wind turbine for example with MW being a unit for Power. All power plants and turbines generating electricity will have a capacity factor. A 100% capacity factor means that the power plant or turbine would generate the maximum amount of electricity it could all the time on a particular day. In reality capacity factors are not 100% as a result of losses. Wind turbines have a capacity factor of about 30%. Meaning in a particular year it will generate full electricity for 30% of the year. If we take this capacity factor for a day 0.3 and multiply it by 2 MW and multiply this by 24 hours in a day we get 14.4 MWh generated in one day based on these assumptions.