Matthew L. Wald – who reliably turns out ahead-of-the-pack energy stories – with lots of detail, good news and bad – got to write about GM’s announcement that it plans to build the world’s largest rooftop solar array. “Large Solar Array Set for G.M. in Spain.“

The array will power a G.M. manufacturing plant. (For his labors – Wald didn’t even get to go to Spain – but apparently he didn’t have to go to Detroit either, so perhaps it’s a wash).

Why is GM building this in Spain? Because the Spanish current subsidize solar at a rate five times that of the United States.