Dairy farmers in Massachusetts are using food waste to create renewable energy. Each farm produces enough to power about 1,500 homes. This helps prevent the release of methane, a greenhouse gas.
Digesters convert livestock manure into electricity. Farmers can use it to power their operations or even sell some back to the grid. But some have found the technology too pricey to maintain.
At the Heartland Biogas Project, spoiled milk, old pet food and vats of grease combine with helpful bacteria in massive tanks to generate gas. It's all thanks to anaerobic digestion.
