**Key Findings:** * The probability distribution of the state of stress indicates significant uncertainties in the magnitude of the maximum horizontal stress S(Hmax), while the minimum horizontal stress S(hmin) is well constrained by stress measurements * The probability that the Mount Simon reservoir was initially critically stressed is relatively high—25%. * When the pore pressure increases to the maximum pressure allowed under the UIC Class VI permit of the FutureGen 2.0 project, the risk of shear failure approaches a probability of 43%. * Based on the maximum injection pressure allowed in the UIC Class VI permit, the risk of unintentional hydraulic fracturing is limited **NRAP Tools:** SOSAT **Location:** FutureGen 2.0, Illinois Basin