In a large Dutch oven or other heavy pot, heat oil over medium-high. Add onion, poblano, and garlic: season with salt. Cook, stirring occasionally, until onion is transclucent, about 4 minutes.
Stir in green chiles, chili powder, and cumin and cook 3 minutes. Add beans, tomatoes and juice, and 2 cups of water: bring to a boil over high. Reduce heat and simmer until vegetables are tender and chili is thickened, 20 to 30 minutes. Season to taste with salt