Microbial hydrogen from depleted oilfields: Eclipse's RenovaStrata field trial and the $0.56/kg question

Eclipse Energy is using microbes to turn depleted oil reservoirs into subsurface hydrogen bioreactors. The RenovaStrata process injects proprietary microbial agents through existing wells, converts residual hydrocarbons into hydrogen-rich gas, and produces it through existing infrastructure. The company says this avoids new drilling, electrolysis, and surface reforming. An independent assessment by Wood Group puts potential levelized cost at $0.56/kg with carbon intensity of 0.076 kg CO2/kg H2. A 2025 field trial in California's San Joaquin basin reached a peak raw hydrogen concentration of 40 mol % and saw no increase in H2S or formation damage. Next steps include larger multi-well deployments with Weatherford. The technology is still pre-commercial. The cost and carbon intensity figures come from modeling, not long operating history. The key question is whether stable production rates and gas separation costs hold up at scale, and whether regulators treat this as low-carbon hydrogen or as extended life for fossil assets.