Document g5g5qJvZJbYnZxmGmqQZbMp9

BURNS 41cIDONNELL Mr. Criswell June 23, 2023 Page 5 perhaps significantly, from the estimates, analyses, and recommendations contained herein. In the preparation of this, information provided by Talen was used by BMcD to make certain assumptions with respect to conditions that may exist in the future. While BMcD believes the assumptions made are reasonable for the purposes of this study, BMcD makes no representation that the conditions assumed will, in fact, occur. In addition, while BMcD has no reason to believe that the information provided by Talen, and on which this report is based, is inaccurate in any material respect, BMcD has not independently verified such information and cannot guarantee its accuracy or completeness. Cost Summary We prepared the following cost summary of the various options. Table 1 is a summary of key assumptions while Tables 2-5 are the costs summarized and levelized to dollars per ton. Tables 2 and 4 assume the baseline is the 2022 average emission rate of 0.022 lb fPM/mmBtu while Tables 3 and 5 assume the average emission rate the EPA used in the MATS evaluation of Colstrip (0.0195 lb fPM/mmBtu). Table 1: Summary of Capital and O&M Costs Capacity Factor: Life, years Cost of Money, % Capital Recovery Factor Property Taxes, Insurance Disposal cost, S/ton Power cost, $/MW Lime cost, S/ton 85% 15 8.25 0.118619 0 15 45 200 Sierra Club FOIA 2025-EPA-04883 ED_018388_00000307-00036 SC_EVERSPLIT0006132