Document M4jYaj1nyNgBbXr1N28rjQrYV

USCA Case #24-1190 Document #2062093 Filed: 06/27/2024 Page 88 of 92 Appendix B Description of the REMI Model The REMI Modeling Methodology The basic approach of using the REMI model to produce the results for this study is illustrated in Figure B.3, below. The analysis started with a baseline projection for the Montana economy, where the Colstrip SES and Rosebud Mine are present. Next, the analysis employed the REMI model a second time, simulating an alternative scenario where the two facilities arc closed and their associated economic activity are absent from the Montana economy. B.3. PoIfc). .111(14 ("vin; fhe RE111.1foclel Status Quo Scenario Economy with Closures in Colstrip Model Baseline Forecast Alternative Forecast Economic Impact (Alternative minus Baseline) The difference between the two economic projections represents the economic impact of MATS-induced rulemaking in Montana. The REMI model utilizes historical data on production, prices, trade flows, migration, and technological advances to calibrate the relationship between five basic blocks of the state economy: 1) Output and Demand; 2) Labor and Capital Demand; 3) Population and Labor Supply; 4) Compensation, Prices and Costs; and 5) Market Shares. These linkages are shown in Figure 13.4, below. 25 Sierra Club FOIA 2025-EPA-04883 ED_018388_00000309-00088 SC_EVERSPLIT0006251