Investor Presentaiton

PSCO | Plant Information Station, Location and Unit Steam: Comanche-Pueblo, CO Unit 2 Unit 3 Craig-Craig, CO, 2 Units PSCO | Investor Fact Book October 2023 | Xcel Energy Summer 2022 Net Dependable Fuel Installed Capability (MW) Emissions Control Equipment Coal 1975 335 BH (PM), DS (acid gases), LNBS (NOx), ACI (mercury) Coal 2010 500 (a) Coal 1979-1980 82 (b) Hayden-Hayden, CO, 2 Units Coal 1965-1976 233 (c) BH (PM), DS (acid gases), LNBS (NOx), SCR (NOx), ACI (mercury) Each unit: BH (PM), WS (acid gases), LNBS (NOx), OFA (NOx) Each unit: BH (PM), DS (acid gases), OFA (NOx), SCRS (NOx), LNBs BH (PM), DS (acid gases), LNBS (NOx), SCR (NOx), CA (mercury), OFA Pawnee-Brush, CO, 1 Unit Coal 1981 505 Cherokee-Denver, CO, 1 Unit Combustion Turbine: Natural Gas 1968 310 Blue Spruce-Aurora, CO, 2 Units Natural Gas 2003 264 Each combustion unit: LNBs (NOx), OC (CO) Cherokee-Denver, CO, 3 Units Natural Gas 2015 576 Each combustion unit: 2 combined cycle units and 1 steam turbine SCR (NOx), LNBs, OC (CO) Fort St. Vrain-Platteville, CO, 6 Units Unit 4: SCR (NOx) Natural Gas 1972-2009 973 (1 steam turbine) Units 2-6: LNBs Manchief, CO, 2 Units Natural Gas 2000 250 Rocky Mountain-Keenesburg, CO, 3 Units Natural Gas 2004 580 2 combined cycle units and 1 steam turbine Each combustion unit: SCR (NOx), OC (CO), LNBS Various locations, 8 Units Natural Gas Various 251 Wind: Rush Creek, CO, 300 Units Wind 2018 582 (d) Cheyenne Ridge, CO, 229 units Wind 2020 477 (d) Hydro: Cabin Creek-Georgetown, CO Pumped Storage, 2 Units Various locations, 6 Units Hydro Hydro 1967 210 Various 23 Total 6,151 (a) Based on PSCo's ownership of 67% of Unit 3 (b) Based on PSCo's ownership interest of 10%. (c) Based on PSCo's ownership interest of 76% of Unit 1 and 37% of Unit 2. (d) Values disclosed are the generation levels at the point-of-interconnection. Capacity is attainable only when wind conditions are sufficiently available (on-demand net dependable capacity is zero). PM Particulate Matter SCR Selective Catalytic Reduction NOX - Nitrogen Oxides ACI Activated Carbon Injection LNBs Low-NOx Burners OFA Overfire Air CO Carbon Monoxide ESP Electrostatic Precipitator BH - Baghouse DLI - Dry Limestone Injection LI-Lime Injection UI-Urea Injection DS Dry Scrubber WS- Wet Scrubber WI Water Injection MCM - Mechanical Collector & Multiclone OC Oxidation Catalyst CA Chemical Additive 56

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