A few summers ago, I conducted my graduate-school research at a health clinic in a batey, or rural community, about an hour north of Santo Domingo in the Dominican Republic. Punta Cana’s high-end resorts and all-you-can-eat buffets are a stark contrast to the impoverished former sugarcane plantations that make up the bateys in the island’s interior. Electricity is rare and subject to apagaones (blackouts) that can last an…