
Map from US EPA
How the Story Broke
On September 13, 2024, E&E News by Politico broke a shocking story about an underground carbon dioxide (CO2) leak six months earlier at Archer-Daniels-Midland (ADM)’s much-lauded carbon capture and storage facility in Decatur, IL. After only seven years, a corroded pipe had allowed high pressure CO2 to move above the shale cap rock intended to contain it forever. Digging deeper, we learned there were problems with this monitoring well years before. The problems were not revealed to the public and the well continued to operate.
The monitoring gauges on Monitoring Well #2 were experiencing intermittent electrical shorts as early as September, 2020, less than three years after injection of CO2 began. By January, 2022, the gauges had fully failed. Later that year, ADM discovered the well had leaked 307 metric tons of CO2 into the Ironton-Galesville formation above the confining zone. Its reports to the Environmental Protection Agency (EPA) showed the company intended to take “temporary measures to isolate the CO2 leakage,” which included plugging the well with cement.
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