The following table lists unplanned and planned production outages at U.S. refineries as reported by Dow Jones Newswires. The information is compiled from both official and unofficial refining sources and doesn't purport to be a comprehensive list.

ExxonMobil Corp. (XOM) Saturday reported emissions at its huge Baytown, Texas, oil refinery during the planned shutdown of Hydrofining Unit 3. was in the process of shutting down as planned Saturday when an associated tower over pressured, releasing emissions to the flare system, the company said in a report to Texas state environmental regulators. The report did not state the reason for the unit's shutdown or how long it will be out of service.

A key gasoline-making FCCU at BP PLC's Texas City, Texas, oil refinery lost circulation on July 29, causing an upset that resulted in excess opacity and emissions at the refinery for about nine hours, the company said in a report to Texas state environmental regulators. FCCU was stabilized and resumed normal operations, the report said.

Valero Energy (VLO) on July 29 said the restart of the third crude unit at its Texas City, Texas, refinery was on track for late this week. The unit was taken out of service on July 18 to repair a leak while the two other crude distillation units remained in operation.

North Atlantic Refining on July 29 said its 115,000-barrel-a-day refinery in St. John's, Newfoundland, Canada, is in the process of restarting after a longer-than-expected period of planned maintenance. The plant-wide turnaround began in early May and was planned to end in mid July. However, on July 5, the company delayed the start-up until the end of the month.

BP PLC (BP, BP.LN) on July 29 began the process of restarting a residual hydrotreating unit, or RHU, train at its refinery in Texas City, Texas. The train was depressurized on July 18 to facilitate repairs to fix a leak at the unit's heat exchanger. Two other trains at the RHU continued to operate during the repairs.

Husky Energy (HSE.T, HUSKF) on July 28 said turnaround maintenance on isocracking units at its Toledo and Lima, Ohio, oil refineries will take place in the third quarter of 2011. General maintenance will go on simultaneously at the Toledo refinery.

Western Refining Inc. (WNR) on July 27 said its El Paso, Texas, refinery is in the process of restarting following a widespread power outage and plant-wide shutdown the night before.

Total Petrochemicals USA on July 26 began the process of restarting several processing units at its Port Arthur, Texas, oil refinery after a lightning strike earlier on July 26 forced shutdowns, the company said in a report to Texas state environmental regulators.

Valero Energy (VLO) on July 26 announced third-quarter turnaround maintenance plans for a crude unit and a coker unit in the east plant at its Corpus Christi, Texas, refinery for three weeks starting in October. Six weeks of planned maintenance will begin in October at a crude unit and FCCU at its Three Rivers, Texas, refinery.

Alon USA Energy Inc. (ALJ) recently began turnaround maintenance at a key gasoline-making unit at its oil refinery in Big Spring, Texas, a report to Texas state environmental regulators made public on July 25 said. The date of the unit's return to normal service wasn't provided.

Exxon Mobil Corp. (XOM) on July 25 confirmed an equipment malfunction and the emissions associated with the event at its Joliet refinery in Channahon, Ill., but would not provide further details.

Valero Energy on July 25 said a coker unit at its refinery in Texas City, Texas, continues to operate following a power "blip" at an associated compressor. The event had no material impact on production. Read More