On a sultry day in early June, the front lawn of the Hells Canyon and Zhoo Zhoo winery feels like a tiny slice of Tuscany transported to Caldwell, Idaho. Soft music plays, sunlight falls gracefully through tree canopies, and the twisting length of the Snake River is visible far beyond the grapevines. It’s deeply serene. But the winery has an open secret: Both the wine and ambiance are made possible by solar power.