An observation, which comes from a vacation I just took to Germany:
When you happen to find yourself on a train traveling from Munich, Germany to Salzburg, Austria, you have a lot of idyllic landscape to inhale. But the stunning thing is that as you travel from one perfectly bucolic farm to the next, each rustically charming farmhouse (German: Farmhaus) you pass has one thing in common with its predecessors: a solar panel array on the most south-facing part of the roof.
Germany is a paragon of renewable power, to say the least. It’s amazing what the right tax credits and incentives can do. But the kicker lies in these two maps.
These are equivalent maps — both show the total incident solar energy on a square meter solar panel tilted optimally towards the sun — but unfortunately, the colors don’t quite match up. The map of Europe is in kWh/m²/year and the U.S. is in kWh/m²/day (hey, but at least it’s not hp/ft²/day, right?). Multiplying the U.S.’s scale by 365.25 means the darkest red should be about 2447 kWh/m²/year — more than the darkest red of the Europe map. The part of Germany I was traveling through on train is pretty solidly mindaro-colored, equivalent to about 1350 kWh/m²/year. That works out to 3.70 kWh/m²/day, or a nice shade of emerald.
You know, emerald. The same color as SEATTLE.