France just scaled its urban biogas program to cover Paris and seven surrounding cities — collecting organic food waste from 4.2 million households and converting it through anaerobic digestion into biomethane injected directly into the natural gas grid, heating 200,000 homes with zero fossil fuel input.
The Grand Paris Biogas program deploys sealed underground anaerobic digestion vessels at 23 district waste processing hubs across the metropolitan area. Food scraps, restaurant waste, and supermarket organic discards are collected in sealed bins, shredded, and fed into digestion vessels where microorganisms break down organic matter over 30 days, releasing methane captured at 96 percent purity and compressed for direct grid injection. The remaining digestate — a nutrient-rich slurry — is distributed to surrounding agricultural land as fertilizer replacing synthetic nitrogen products derived from fossil gas.
Paris produces 1.4 million tonnes of organic food waste annually. Full conversion through biogas would generate enough biomethane to heat 600,000 homes — nearly eliminating residential gas imports for heating across the metropolitan area entirely. France has approved scaling this program to all cities above 100,000 residents by 2028.
Source: SUEZ Environment France, Ile-de-France Regional Council, French Ministry for Ecological Transition, 2025
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