As many generations of Dieter Dürrmeier’s family as he can track have grown vegetables and tended livestock here in Opfingen, a hilly corner of southern Germany near the French and Swiss borders. Over the decades the Dürrmeiers have adapted, ever on the lookout for new ways to make money. In 1963, Dürrmeier’s father exploited cheap government loans to move his 136-acre farm from the crowded village to the outskirts of town. In 1986 the Dürrmeiers stopped raising cows and shifted to the less cyclical business of boarding wealthy city dwellers’ horses. But the family’s current shift has been its most lucrative yet. Though they still grow asparagus and grapes and tend to the equines, the Dürrmeiers today harvest their fattest earnings from sunshine. Thanks to generous checks from the German people, that crop from the sky spins off cash more reliably—and at higher margins—than anything the Dürrmeiers have ever grown in the ground.

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