Petroleum & Coal Products Manufacturing
NAICS 324: Petroleum refining and coal products manufacturing. US refinery operations, crack spreads, renewable diesel, and fuel production.
Industry at a Glance
Sector-wide aggregates across all businesses classified under NAICS 324 (2017 classification frame). For specific sub-industries within this sector, see the individual reports below.
Industry Overview
Petroleum and coal products manufacturing (NAICS 324) covers the refining of crude oil into transportation fuels, petrochemical feedstocks, and specialty products, along with coal-to-coke conversion for steelmaking. The US operates approximately 130 petroleum refineries with a combined throughput capacity exceeding 18 million barrels per day, concentrated along the Gulf Coast (Texas and Louisiana), the Midwest, and California. Marathon Petroleum, Valero Energy, and Phillips 66 rank as the three largest US refiners by capacity.
Refinery economics revolve around the crack spread, the margin between crude oil input costs and refined product output prices. The 3-2-1 crack spread (three barrels of crude yielding two barrels of gasoline and one barrel of distillate) is the industry's benchmark profitability metric. Configuration matters: complex refineries equipped with cokers and hydrocrackers can process heavier, cheaper crude grades into higher-value products, while simpler refineries face margin disadvantage during periods of wide light-heavy crude differentials.
The sector operates under EPA Renewable Fuel Standard (RFS) mandates requiring blending of ethanol and biodiesel into the fuel supply, along with Tier 3 gasoline sulfur standards and IMO 2020 marine fuel sulfur limits. Several Gulf Coast and California refineries, including facilities operated by Marathon and HollyFrontier (now HF Sinclair), have converted or are converting hydrotreating units to produce renewable diesel from soybean oil, used cooking oil, and animal fats, pursuing both RFS compliance credits and California Low Carbon Fuel Standard (LCFS) premium pricing.
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Industry Trends
Gulf Coast refineries operated by Marathon Petroleum and Valero are investing in renewable diesel and sustainable aviation fuel (SAF) co-processing units to capture Renewable Fuel Standard credits and California LCFS premiums
EPA Tier 3 gasoline sulfur standards and tightening RFS biofuel blending mandates are requiring ongoing capital investment in hydrotreating and blending infrastructure across the refining fleet
East Coast and California refinery closures, including the Philadelphia Energy Solutions refinery shutdown and planned Rodeo facility conversion by Phillips 66, are tightening regional product supply and shifting logistics toward pipeline and marine imports
Coke production for steelmaking at integrated facilities like SunCoke Energy's plants faces structural demand decline as electric arc furnace steelmaking gains market share, reducing met coke consumption
Permian Basin crude production growth continues to strain pipeline and export terminal capacity at Gulf Coast ports, benefiting refiners with crude-advantaged locations while creating periodic pricing dislocations at Cushing, Oklahoma
Specialty Reports Available on Request
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Industry Groups
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Frequently Asked Questions
What is NAICS 324? ▾
NAICS 324 classifies petroleum refineries and coal product manufacturers. Petroleum refining, the dominant segment, transforms crude oil into gasoline, diesel, jet fuel, heating oil, and petrochemical feedstocks. Coal products manufacturing includes coke production for blast furnace steelmaking. The US operates approximately 130 refineries with over 18 million barrels per day of combined capacity.
What is the crack spread and why does it matter to refiners? ▾
The crack spread measures the difference between crude oil input costs and refined product output prices. The industry-standard 3-2-1 crack spread assumes three barrels of crude yield two barrels of gasoline and one barrel of distillate. This metric is the primary profitability indicator for refiners. Complex refineries with coking and hydrocracking units achieve wider effective crack spreads by processing cheaper heavy crude grades into high-value light products.
How is the Renewable Fuel Standard reshaping refinery operations? ▾
The EPA's Renewable Fuel Standard requires refiners to blend specified volumes of ethanol, biodiesel, and advanced biofuels into the US fuel supply or purchase compliance credits (RINs). This mandate has driven several refiners, including HF Sinclair and Phillips 66, to convert existing hydrotreating units to renewable diesel production. California's Low Carbon Fuel Standard provides additional financial incentives that make renewable diesel production economically attractive.
Which US regions have the largest refining concentration? ▾
The Gulf Coast (PADD III), spanning Texas and Louisiana, processes over half of total US refining capacity, anchored by the Houston-Beaumont-Port Arthur corridor and the Louisiana Baton Rouge-Lake Charles corridor. The Midwest (PADD II) is the second-largest refining region, centered on facilities in Illinois, Indiana, and Ohio. California operates its own distinct gasoline specification market with roughly 1.7 million bpd of capacity.
What is the role of coke production within NAICS 324? ▾
Metallurgical coke, produced by heating coal in oxygen-free ovens, is a reducing agent essential for blast furnace ironmaking. SunCoke Energy is the largest independent US coke producer, operating plants in Indiana, Ohio, Virginia, and Illinois. However, coke demand faces long-term structural decline as electric arc furnace steelmaking, which uses scrap steel instead of iron ore, captures an increasing share of domestic steel output.
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