The watt (and hence kW and MW) are measurements of power, not energy. kWh (and MWh) are common, internationally accepted units for measuring energy.
Wind (and solar) energy production tends to vary seasonally, so it makes sense to use a year rather than some other time unit when discussing how much energy these things can produce.
Wind (and solar) energy production tends to vary seasonally, so it makes sense to use a year rather than some other time unit when discussing how much energy these things can produce.