Business Overview: SunCoke Energy, Inc. (NYSE: SXC)

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Executive Summary

SunCoke Energy, Inc. describes itself as the largest independent producer of high-quality coke in the Americas, operating through two segments: Domestic Coke and Industrial Services. The company runs five U.S. cokemaking plants (Middletown, Granite City, Indiana Harbor, Haverhill II, and Jewell) with about 3.7 million tons of nameplate capacity, plus an operated plant in Vitória, Brazil run under license for ArcelorMittal, and an Industrial Services segment handling terminal, trucking, and slag/scrap services.

It matters because SunCoke sells most of its coke under long-term, take-or-pay contracts with fixed per-ton fees that pass through coal costs — a structure designed to generate stable cash flow — but a 2025 contract breach by customer Algoma Steel triggered a $90.1 million asset impairment and the planned Q1 2026 closure of the Haverhill I facility, underscoring real customer-concentration risk in this heavy-industrial niche.

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1. Core Business Model & How They Work

SunCoke converts metallurgical coal into coke for blast furnace steelmaking using heat-recovery technology that also generates saleable steam and electricity, selling primarily under long-term contracts, while its Industrial Services segment earns fee-based revenue handling bulk materials for third parties.

[ Coal procurement ] ➡️ [ Heat-recovery cokemaking (steam/electricity byproduct) ] ➡️ [ Long-term take-or-pay contracts with steelmakers ] ➡️ [ Spot/export sales for non-contracted tons ]
[ Industrial Services: terminals, slag/scrap handling ] ➡️ [ Per-ton handling fees, no ownership of materials ]

Key Operational Drivers

1. Take-or-pay contract structure: most blast furnace coke is sold under long-term agreements with fixed per-ton fees that pass through coal, operating, and transportation costs, subject to coal-to-coke yield targets — insulating margins from coal price swings as long as customers perform.
2. Heat-recovery technology: unlike traditional by-product cokemaking, SunCoke's ovens generate steam and electricity that is sold for additional revenue, a differentiated operating approach versus some competitors.
3. Customer concentration with major steelmakers: Cleveland-Cliffs (Cliffs Steel), U.S. Steel, and Algoma Steel are the primary domestic customers, with contracts like Granite City's U.S. Steel agreement (extended through December 2026) and Haverhill II's Cliffs Steel agreement (extended through December 2028).
4. Algoma Steel contract breach: Algoma stopped accepting additional coke tons in Q3 2025, breaching its contract; SunCoke is pursuing enforcement and recovery, and recorded a $90.1 million impairment tied to the resulting Haverhill I closure.
5. Industrial Services diversification: terminals (Convent Marine, Kanawha River, Lake Terminal) handle and transload more than 40 million tons annually, while roughly 15 molten slag and scrap handling sites across the U.S., Brazil, Slovakia, and Spain provide fee-based revenue without SunCoke taking ownership of the materials — a lower-risk complement to the coke business.
6. Brazil operations under license: the Vitória, Brazil plant is operated for ArcelorMittal Brazil under license and operating agreements, extending SunCoke's footprint internationally without requiring it to own the underlying steel customer relationship risk directly.

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2. Business Segments

┌───────────────────────────────────────────┐
│            SunCoke Energy, Inc.                │
└──────────────────────┬────────────────────────┘
                        │
            ┌───────────┴───────────┐
            ▼                       ▼
┌─────────────────────┐   ┌─────────────────────┐
│    Domestic Coke       │   │  Industrial Services   │
│  5 US plants, 3.7M tons│   │  Terminals (40M+ tons/yr)│
│  + Brazil (1.7M tons)  │   │  ~15 slag/scrap sites    │
└─────────────────────┘   └─────────────────────┘

Domestic Coke

Five U.S. plants (Middletown OH, Granite City IL, Indiana Harbor IN, Haverhill II OH, Jewell VA) producing blast furnace and foundry coke, plus the Vitória, Brazil plant operated for ArcelorMittal. Haverhill I is closing in Q1 2026 following the Algoma breach.

Industrial Services

Convent Marine Terminal (Gulf Coast), Kanawha River Terminal, and Lake Terminal provide bulk material mixing and transloading capacity, while roughly 15 molten slag and scrap handling sites across the U.S., Brazil, Slovakia, and Spain generate per-ton handling fee revenue.

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3. Product Portfolio

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4. Competitive Landscape

• Merchant coke producers and captive steelmaker plants: SunCoke competes with other independent coke producers and with steelmakers that operate their own captive coke facilities rather than buying externally.
• Import competition: coke imports from China, Colombia, and Indonesia affect export market pricing and availability.
• Industrial Services competitors: other bulk terminals and trucking operators compete for shorter-haul logistics business, alongside a small number of specialized scrap and slag service providers.
• Technological substitution: electric arc furnaces and alternative ironmaking technologies that use less or no coke represent a longer-term structural threat to blast-furnace-dependent coke demand.

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5. Strategic Strengths & Risks

Strengths (The Moat)

• Largest independent coke producer in the Americas: scale across five domestic plants plus Brazil gives SunCoke negotiating leverage and operational flexibility that smaller independent producers lack.
• Take-or-pay contract structure: long-term, cost-pass-through contracts with major steelmakers are designed to provide predictable cash flow largely insulated from coal price volatility, so long as customers honor their commitments.
• Differentiated heat-recovery technology: generating and selling steam and electricity byproducts is a genuine technological and revenue differentiator versus some traditional by-product cokemaking competitors.
• Diversified Industrial Services segment: fee-based terminal and slag/scrap handling revenue, where SunCoke never takes ownership of the underlying materials, reduces commodity price risk relative to the core coke business.

Risks

• Severe customer concentration: the Algoma Steel breach — which triggered a $90.1 million impairment and the Haverhill I closure — demonstrates how dependent SunCoke is on a handful of large steelmaker customers honoring long-term contracts.
• Aging infrastructure: reliance on older coke ovens creates ongoing equipment reliability and maintenance risk.
• Environmental regulation: MACT compliance deadlines remain subject to ongoing EPA reconsideration and litigation, creating regulatory uncertainty.
• Structural steel industry risk: the longer-term shift toward electric arc furnace steelmaking, which uses little or no coke, is a structural demand threat to SunCoke's core business.
• Labor exposure: approximately 53% of employees are unionized, creating labor relations and cost risk.
• Legacy liabilities: a reduced but still-present black lung liability (about $12.6 million remaining after a 2025 settlement) reflects ongoing legacy obligations from the broader coal/coke industry.

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6. Financial Overview

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7. Summary Conclusion

SunCoke's moat is built on scale as the largest independent coke producer in the Americas and a take-or-pay contract structure designed to pass through coal cost volatility, reinforced by a differentiated heat-recovery technology and a diversified fee-based Industrial Services segment. The Algoma Steel contract breach and resulting Haverhill I closure, however, are a stark reminder of how concentrated SunCoke's customer base is — the company's multi-year trajectory depends on successfully enforcing and recovering from that breach while navigating the structural, long-term shift in global steelmaking away from blast-furnace-and-coke technology toward electric arc furnaces.