MW tells us the scale of the plant. TWh/year tells us the production of the plant. I've got a good gut sense for what a 3 MW wind turbine looks like, so when

MW tells us the scale of the plant. TWh/year tells us the production of the plant. I've got a good gut sense for what a 3 MW wind turbine looks like, so when I read "50 MW Plant" - I can already envision about how large, and about how many turbines it will have (approx 15-30). TWh/year doesn't tell me as much, because the plant might be located in a very windy place. Or maybe not in a windy place at all - the data is still useful, but I prefer MW when people are talking about a plant's "physicality".