There is a silver lining in the destruction that Hurricane Maria left behind on Puerto Rico. While the island’s antiquated electric system lies in ruins, renewable energy investors see a golden opportunity in the crisis to use federal funds to re-invent the US territory’s grid as a storm-resistant network that relies less on costly coal and oil imports and more on local wind, solar, and batteries. If it happens, it could ease power bills on an island that struggles with costly, unreliable electricity.