Algoma Steel Group Inc. · NASDAQ:ASTL
Algoma Steel — Corporate Update (March 2025)
25 slides from Algoma Steel's corporate update, Mar 18, 2025
Slide 1: Community Liaison Committee, Tuesday March 18, 2025
Community Liaison Committee Tuesday March 18, 2025 ArSOMA
Slide 2: Safety and values statement
With every decision, every action, every day, we will work safely with teamwork, integrity and deep care for our people, their families and the environment.
Slide 3: Meeting agenda
1. Review of December 10th, 2024 Meeting Notes 2. Review CLC Term of Reference Proposed Revision 3. Membership Items 4. Cokemaking Emissions Performance 5. Review 2024 Fourth Quarterly Report – Ambient Air Quality Monitoring Program 6. Electric Arc Steelmaking and Environmental Permit Applications 7
Slide 4: CLC Terms of Reference proposed revision
After reviewing the current Terms of Reference for the CLC committee, Algoma Steel would like to propose a change. Specifically, we suggest the following revision to the "Membership" section: Current wording: "One member representing the First Nations” Proposed change: “One member representing each
Slide 5: CLC membership representation
Representation Primary Member Alternate Algoma Steel Corey Jackson Giancarlo Perra MECP Lori Jalak Rick Lalonde Public David Trowbridge Anton Schoahs Public Jillian Marquis Dan Gabor SSM Tribe of Chippewa Indians TBD Algoma Public Health Melissa Francella Virginia Huber Chippewa County Health Dept.
Slide 6: Cokemaking emissions limits and performance
30 Day Rolling Average % Implementation Charging Pushing Doors Lids Off-takes Date Emissions Opacity (%) average intensity of pushing emissions average duration of charging emissions July 2, 2015 38 0.8 25 12 sec 50 % lid leaks Jan. 1, 2016 22.5 0.8 15 12 sec 50 % off-takes leaks Jan. 1, 2017 7 0.8
Slide 7: Cokemaking Emissions Performance
Cokemaking Emissions Performance 30-Day Rolling Average of Door Emissions 30-Day Rolling Average of Offtake Emissions as ——7 Battery 2 A a Battery —7esttery as 9 Battery 7 —sater rani =e a g \aJ —nroieient |B ee Pas —rorateestart |S 3 ran 20edent 3, —sovayrestat | z 2 ar sa restart gis = 30 Day Rest
Slide 8: Cokemaking Emissions Performance
Cokemaking Emissions Performance ‘Average Pushing Opacity erceare a SB OR ° All Batteries Average Pushing Opacity by Year Number of Audited Pushes by Opacity 3000 2500 3 2000 id é 550% 8 1500 5 40-50% 2 1000 = 30-40% 5 <30% 500 oO 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2015 2016 2017
Slide 9: Cokemaking Stack Opacity
Cokemaking Stack Opacity 30 Day Rolling Average of Opacity >20% For Each Coke Battery in Hours Per Day 30 Day Rolling Average of Opacity | Pf Na Nay wl fa Att MS Bao N\ ff Ay \a A rl aap gon ANE VA Mou >20% opacity € q al average Opaci Vi oa a a oa a a eo io oO cs > > > ~ > > 2 x os wy oa a Se a a e
Slide 10: 2024 Fourth Quarterly Report - Ambient Air Quality Monitoring Program
2024 Fourth Quarterly Report —- Ambient Air Quality Monitoring Program Maximum Minimum Arithmetic Mean (Quarterly) Standard Number of Excursions Guideline, AAQC Criteria Bonney Street Station (71042) Parameter U Continuous Parameters (Quarterly) Total Reduced Sulphur (TRS) - 10 minute ppb 76.0 0 2.0
Slide 11: 2024 Fourth Quarterly Report - Ambient Air Quality Monitoring Program
2024 Fourth Quarterly Report - Ambient Air Quality Monitoring Program Parameter Units Maximum Minimum Arithmetic Mean (Quarterly) Standard Number of Excursions Guideline, AAQC Criteria Fourth Avenue - David Kyle Park Station (71082) Continuous Parameters (Quarterly) Total Reduced Sulphur (TRS) — 10
Slide 12: 2024 Fourth Quarterly Report - Ambient Air Quality Monitoring Program
2024 Fourth Quarterly Report - Ambient Air Quality Monitoring Program Parameter Units Maximum Minimum Arithmetic Mean (Quarterly) Standard Number of Excursions Guideline, AAQC Criteria West & Cathcart Station (71083) Continuous Parameters (Quarterly) Total Reduced Sulphur (TRS) ~ 10 minute ppb 205 0
Slide 13: 2024 Fourth Quarterly Report - Ambient Air Quality Monitoring Program
2024 Fourth Quarterly Report - Ambient Air Quality Monitoring Program Parameter Maximum Minimum Arithmetic Mean (Quarterly) Standard Number of Excursions Guideline, AAQC Criteria Wallace Terrace Station (71090) Casein oe — Benzene <MDL <MDL <MDL 0.45 (Annual) ° 2.3 gim® (24-hour) Bevclajpyrene (Pass
Slide 14: Building a New Era in Steelmaking
vy AC Building a New Era in Steelmaking
Slide 15: Slide 15
Slide 16: Electric arc furnace transition benefits
Adds ~700kt of finished steel capacity aligning steelmaking capacity to rolling capacity. ~70% fewer total CO2 emissions (annual reduction of 3 million tonnes of CO2). More flexible operations capable of responding dynamically to market conditions. Reduced sustaining CapEx. Improves employee product
Slide 17: EAF construction progress photos
Dust system complete. Axial Cyclone installation on Baghouse EAF #2 ready for assembly and installation. Photos taken February 2025
Slide 18: Algoma expected to become a leading green steel producer
3.0mm tonnes 70% 1.33 tonnes 75% 4,060 tonnes 82% 1,604 tonnes 52% Complete elimination of Stack 100% and Fugitive Emissions Algoma expected to become one Improves profile with select of the leading producers of green customers who are similarly steel in North America. ESG focused. Improves competit
Slide 19: Environmental Compliance Approval applications for EAF steelmaking
Environmental Compliance Amendment to the existing industrial Approval for air and noise based sewage works Environmental on the facilities associated with Compliance Approval that incorporates: the transition to electric arc New recirculating non-contact cooling furnace steelmaking. Application wat
Slide 20: Abatement Plan accepted by the MECP
Algoma steel has prepared an Abatement Plan, which has been accepted by the MECP, to bridge the gap until an alternate standard is available under O.Reg. 419. The Abatement Plan is an evolving emissions management plan which aligns with industry best practices and future requirements of the ITS. A s
Slide 21: Shoreline stabilization and site greening project
Algoma’s shoreline stabilization project consists of a four year plan to install 4.1 km of shoreline protection along the St. Mary’s River to prevent future erosion. As of December 2024, the project is valued at $4.07 million. The project will resume this summer with the placement of the clean rip-r
Slide 22: 2025 Business Sustainability Award
We are proud to share we have been recognized with the \ AWARD WINNER 202.5 at the 2025 Business ALGOMA Sustainability — STEEL INC, — Awards! ArSOMA
Slide 23: Community engagement
Quarterly Community Liaison Committee meetings. Donated $10,000 to Save Our Young Adults (SOYA) to support their relocation and renovation costs. Sponsored and participated in the Gathering at the Rapids Pow Wow. Welcomed students from Sault College Manufacturing Processes class for an informative s
Slide 24: Next Community Open House
Our next Community Open House will be held: Wednesday, June 11% , 2025 at Algoma Steel We hope to see you there! ArSOMA
Slide 25: Proposed meeting schedule
Proposed Schedule: June 3, 2025 September 2025 December 2025