Some will criticize renewable energy because the power output is spiky. This sort of thing is why that doesn't matter. There are plenty of things you can do with excess power. There's been research in manufacturing gasoline from the air. It's not economical to do for its own sake but when we're talking about excess power, that's not really a factor. Fertilizer is a new one (to me). But it makes sense. You'll still need phosphorus (phosphate) from somewhere.