Document NeqYvmKmgxXyppJnN9rQLX51b

USCA Case #24-1190 Co strip PM Evaluation -- Final Document #2062093 Apri 29, 2024 Filed: 06/27/2024 Page 32 of 92 Executive Summary 1.2 O&M COST ANALYSIS Table 1-2 provides a summary of the two unit estimated operation and maintenance costs for each option. Table 1-2: Summary of O&M Costs for Units 3&4 Reheat ESP Reheat fabric filter $19,820,000 $12,629,000 $1,265,000 $2,157,000 $21,085,000 $14,786,000 Table 1-3 provides a summary of all the capital and O&M costs plus the cost per ton of particulate removed. Items such as Owner's costs (performance bond, Owner's contingency, and taxes), permitting, funds during construction, are not included. The cost per ton of particulate removed is based on the annual levelized costs and tons of particulate removed from the average historical Colstrip emission rate. Total tons of material collected will likely exceed this amount as it is anticipated the particulate exiting the scrubbers will increase when the pressure drop across the scrubber is decreased to allow for the new control device. Table 1-3: Particulate Control Cost Summar Summary of Particulate Emissions Control Costs from Colstrip Units 3864 PM Emissions Economic Impacts PM-10 Control Alternative (Ranked by PM-10 Rate) Reheat ESP Reheat fabric filter 2022 Baseline (Scrubber) Removal Efficiency % 71.45 71.45 Emission Rate lb/MMBtu 0.006 0 006 0.0220 Hourly Emission Lbs/Hr 95 95 334 Annual Emission Tons/yr 355 355 1245 Emission Reduction Tons/yr 890 890 Installed Capital Cost $1,oco 568,722 356,426 N/A Annual O & M Cost $1,000 21,085 14,786 N/A Total Annual Cost $1000/yr 88,546 57,065 N/A Average Control Cost S/ton 99,536 64,148 N/A Based on this evaluation the recommended MATS compliance approach for Colstrip Units 3 and 4 is the installation of fabric filters between the flue gas reheat system and the stack. The AACE Class 4 capital cost estimate for both units is a total of $356,426,000 (not including Owner's costs). The levelized annual operation and maintenance of the fabric filter option is $14,786,000 including the addition of a one full time equivalent staff member and 5-year bag replacement cycles. It is anticipated this project will take 36-42 months to complete depending on available outage windows. The anticipated tie in outages arc 10 to 12 weeks for Unit 3 and 4 to 6 weeks for Unit 4. ** ** Talen Montana 1-9 Bums & McDonnell Sierra Club FOIA 2025-EPA-04883 ED_018388_00000309-00032 SC_EVERSPLIT0006195