Analysis
Two refineries advertised at the same barrels-per-day rate may be reporting different quantities. EIA defines calendar-day capacity as processing capability under usual conditions, including operational constraints and downtime. Stream-day capacity assumes optimal operation without downtime. Neither is a measured production series.
A credible comparison therefore needs the facility type, process, input or output basis, unit, capacity definition and reference date. Crude distillation, a gas-processing plant, a mineral refinery and an oil terminal are different facilities even if their names contain “refinery”.
Read the reference date before comparing plants
EIA’s 2026 Refinery Capacity Report was released on 26 June 2026 but describes capacity as of 1 January 2026. A subsequent closure or ownership change requires its own evidence. Operating, idle and operable capacity must remain separate; the report also covers some non-refinery process operators.
Wellficent’s refinery edition 2026-10-31-r5 combines EIA records with mapped records of varying evidence quality. An OpenStreetMap tag is not an operator certification. Unverified capacity tags cannot support a worldwide ranking or a global census of operating crude refineries.
A reproducible calculation, with assumptions visible
Assume a fictional unit has stream-day capacity of 100,000 barrels and operates at that full rate for an assumed fraction f of a 365-day year. Annual input = 100,000 × 365 × f. At 80%, 90% and 100%, the results are 29.2, 32.85 and 36.5 million barrels respectively.
The chart shows this arithmetic only. These are not measurements from a real refinery, a forecast or EIA utilisation rates. The assumed fraction combines downtime and reduced operation into a simplified scenario; feedstock and product constraints would require a fuller model. Applying another downtime allowance to calendar-day capacity can count an allowance twice.
Process capacity is not additive
A hypothetical 100,000-barrel crude distillation unit plus a 30,000-barrel catalytic-cracking unit does not equal 130,000 barrels of crude intake. Downstream units process fractions from earlier units; their charge and product capacities have different scopes. Product yields, energy use and hydrogen requirements need a process balance, not addition of equipment ratings.
The same discipline applies to wells and project news
Ballymore’s April 2025 announcement reports 75,000 barrels of oil per day and gas capacity separately. Kaminho’s May 2024 decision gives a 2028 start-up target, rather than current output. P1000’s first ore on 31 January 2025 establishes a commissioning milestone, not sustained concentrate quality. The related reports preserve those distinctions.
Well Atlas records are also source-scoped entries, not automatically distinct physical wells. A field production total cannot be allocated to a particular well without evidence. A nearby refinery or a shared company name does not prove a supply-chain connection.
Limits and evidence needed next
This guide explains definitions and arithmetic; it does not independently certify plant operation or estimate missing capacity. A decision-grade comparison needs the latest dated operator or regulator documents, compatible measurement periods and explicit uncertainty. Keep source rights and attribution when reusing records. The illustration is AI-generated and conceptual, not a photographed refinery or a process design.