Figure shows that the genGEO 22 cm well cost fits the Kemper 22 cm monitoring well cost estimates without modification. However, a genGEO 25 cm well cost (solid orange line in Figure ) does not fit the Kemper 25 cm CO₂ injection well. Thus, an additional cost is needed, ∆ , to modify the 25 cm genGEO well for CO₂ injection. This additional cost is shown in Equation , where is the length of the well and is the inner well diameter. Contingency, , and indirect cost coefficients, , for wells are used. These costs are adjusted by the oil & gas price index, & .