# Cenovus Superior Refinery

Cenovus Superior Refinery, Superior, WI. 49,547 bpd crude capacity (EIA-820). Injects into Magellan Midstream; reaches 34 delivery points and 41 terminals by published tariff. Crude supply, outlets, events.

- Location: Superior, WI
- Status: active
- Crude capacity: 49,547 bpd (EIA-820)
- Operator: Superior Refining Company LLC
- Parent: Cenovus Energy Inc.

## Pipelines it injects into
- Magellan Midstream at Superior, WI (confirmed) — https://thinkingonenergy.com/supply/pipeline/magellan-midstream/

## Reach by published tariff route
| Pipeline | Delivery points | Terminals | Lowest ¢/bbl | Median ¢/bbl |
|---|---|---|---|---|
| Magellan Midstream | 34 | 49 | 121.87 | 407.64 |

## Crude supply
- pipeline: Enbridge Mainline (Lakehead System) — Superior, WI is a well-documented major terminus/hub of Enbridge's Lakehead Mainline System; this is treated as supported on strong general industry knowledge (also corroborated across the other Great Lakes-region refineries reviewed in this batch), though a dedicated citation specific to this refinery's current intake was not retrieved within the search budget.

## Product outlets
- other: unspecified — Cenovus's SEC filing describes its U.S. Manufacturing segment (which includes Superior) as refining crude oil to produce gasoline, diesel, jet fuel, asphalt and other products, but does not name specific outbound pipelines for Superior individually.

## Recent events
- 2025-09 — Wisconsin DNR alleges more than two dozen violations of state air-pollution-control laws at the refinery; a regulatory enforcement matter, not a physical production outage.
- 2023-06 — Refinery reached full operations after a five-year, $1.2 billion rebuild following the 2018 explosion.
- 2023-03 — Restart of the rebuilt refinery began, ramping to about half capacity by late April 2023.
- 2018-04-26 — Major explosion and fire during a maintenance shutdown; an asphalt storage tank breach spilled approximately 17,000 barrels which caught fire; about three dozen workers injured and roughly 2,500 residents evacuated over hydrofluoric-acid leak fears; refinery shut down for a multi-year rebuild.

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Source: Thinking On Energy Supply Explorer — https://thinkingonenergy.com/supply/refinery/superior-refining-company-llc-superior-wi/
Built from published FERC pipeline tariffs, EIA-820, the IRS Terminal Control Number list and sourced research. Rates are line-haul only. Cite as: Thinking On Energy, Supply Explorer, 2026-09-29.