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.

Valero Energy Corp. (VLO) has begun the process of shutting down units at its Aruba refinery because of economic reasons, the company said Thursday.

The company plans to have the entire refinery shut down by the end of next week, company spokesman Bill Day said. So far, the refinery has shut one of its two 38,000-barrel-a-day coking units and a 65,000 barrel-a-day hydrotreater, Day said.

In two to three months, Valero will re-evaluate the economic situation and determine when it might restart the plant, Day said.

Valero said Tuesday that the crude and fluid catalytic cracking units at its Ardmore, Okla. refinery still aren't producing any product following a Saturday night power outage and fire. The fire was put out, but the hydrotreater is still shut down, spokesman Bill Day said.

Exxon Mobil Corp. (XOM) reported to environmental regulators that on Friday it would begin shutting down the boiler at fluid catalytic cracking unit No. 3 for planned work at the Baytown, Texas refinery.

On Wednesday, Exxon said that a snag caused flaring from its fluid catalytic cracking unit No. 2 at the Baytown, Texas refinery. "The event had no impact on production and all customer needs were met," the company said in the filing.

Exxon started work on a hydrogen unit as part of a sulfur recovery unit Tuesday at its Torrance, Calif. refinery, the company said. The work has already caused flaring and should last for a weeks, according to a company spokeswoman.

Marathon Corp.'s (MRO) St. Paul, Minn., refinery experienced a power blip Friday, the company said Monday. Shortly after the outage, the refinery resumed normal operations, company spokesman Robert Calmus said.

Last week, a California judge halted the expansion at Chevron Corp.'s (CVX) Richmond, Calif., refinery. The court ordered Chevron to halt any project-related activity until the city of Richmond has had a chance to reconsider its approval of an environmental review of the project and ensure that the review meets state environmental regulations. The order issued last week gives Chevron 60 days to "demobilize" workers and equipment from the construction site.

For more detailed information, search Dow Jones Newswires using the code N/REF.

 
 
Operator   Refinery    Capacity   Description                  Restart 
                       (in 000s 
                        bbl/day) 
 
UNPLANNED 
 
CANADA 
 
EAST COAST 
 
CARIBBEAN 
 
GULF COAST 
 
Delek      Tyler, TX      58.0  SCOT unit shut June 9            July 14 
                                for approximately four 
                                days of unplanned work. 
 
                                Bad weather upsets units 
                                June 29 
 
Exxon      Baytown, TX   567.0  FCCU #3 boiler shut 
                                for planned work July 10 
 
                                FCCU #2 hits snag July 8 
 
Valero     Norco, LA     185.0  Crude, vacuum, coker unit shut   Jul 5 
                                to restart in 3 weeks following  (est.) 
                                June 9  minor fire. 
 
Valero     Texas City           Power failure disrupts plant 
                                June 27. No impact to production. 
MIDWEST 
 
Marathon   St. Paul        74.0 Power blip disrupts refinery     July 3 
           MN                   briefly July 3. 
 
ROCKY MOUNTAINS 
 
Valero     Ardmore         87.4  July 4 Fire puts crude, fccu      n/a 
                                 on circulation. 
WEST COAST 
 
Alon       Paramount,    53.0   Naphtha hydrotreater             Early 
           CA                   shut April 23 due to an          July 
                                explosion will take 10 
                                weeks to restart, the 
                                co. said on May 7. The 
                                refinery has been at re- 
                                duced rates since Apr. 23. 
 
 
PetroStar  Valdez, AK    48.0   Refinery shut due to Dec.        Jun/Jul 
                                28 fire; expected to re-         2010 
                                start in June/July 2010. 
 
 
PLANNED 
 
CANADA 
 
CARIBBEAN 
 
Valero     Aruba         235.0  The refinery is being shut   Sep/Oct 
                                for economic reasons. All 
                                units to be down by end July 
                                17. Restart will be re- 
                                evaluated in two to three 
                                months. 
 
EAST COAST 
 
Sunoco     Philadelphia, 340.0  Reformer unit shut in Girard    n/a 
           PA                   Point section in early Oct. 
                                for economic reasons. Shutdown 
                                to last one to six months. 
 
 
GULF COAST 
 
Chevron    Pascagoula,    330.0 Pre-commercial heavy oil         2010 
           Miss.                conversion project delayed 
                                from 2008 to 2010 due to 
                                economic factors. 
 
 
Flint      Corpus        288.1  West Plant Coking Unit in re- 
Hills      Christi, TX          start mode on June 3; unit 
                                shut June 1 for planned 
                                maintenance. 
 
                                $250 mil. project for new        Spr 
                                diesel desulfurization,          2010 
                                sulfur recovery unit to begin 
                                in Fall 2008. Construction 
                                to last 18 months. 
 
Marathon   Garyville     245.0  Project to increase crude oil    4Q 
           LA                   refining capacity by 180,000-    2009 
                                b/d 85% complete, the Co. said 
                                on Apr. 30. New units expected 
                                start up in 4th-quarter, 2009. 
 
Motiva     Port Arthur   285.0  Expansion project to increase    1st-Q 
           TX                   throughput capacity by 325,000   2012 
                                b/d, to 610,000-b/d, slowed. 
                                Completion now seen in 1st- 
                                quarter 2012, from 2010. 
 
Valero     Corpus        340.0  Coker Unit shutdown for econo-   n/a 
           Christi, TX          mic reasons and planned work; 
                                delayed to June 19 from June 
                                12. The 20,000-b/d unit will 
                                remain off-line through July 
                                 but could restart at any time 
                                if margins improve, the Co. 
                                said. 
                                20,000-b/d FCCU in East          n/a 
                                Plant shut; West Plant 
                                50,000-b/d FCCU at reduced 
                                rates since mid-Dec. for 
                                economic reasons. 
 
Valero     Norco, LA     250.0  Upgrade project to build         2012 
                                a new diesel hydrotreater 
                                unit moved from 2010 to 
                                4th-quarter 2012, the Co. 
                                said on Jan. 27. 
 
Valero     Port Arthur   325.0  77,000-b/d FCCU at reduced       n/a 
           TX                   rates since mid-Dec. for 
                                economic reasons. Mainte- 
                                is planned at a hydrotreater 
                                unit, the company said on 
                                April 17; no details were 
                                given. 
 
Valero     Norco, LA            Turnaround at coker unit         1/Q 
                                delayed until the first          2010 
                                quarter of 2010 from fourth 
                                quarter 2009, the Co. said 
                                on Apr. 28. 
 
Valero     Sunray, TX    170.0  55,000-b/d FCCU at reduced       n/a 
                                rates since mid-Dec. for 
                                economic reasons. 
 
Valero     Three Rivers   95.0  24,000-b/d FCCU at reduced       n/a 
           TX                   rates since mid-Dec. for 
                                economic reasons. 
                                Plant-wide 24-day turnaround     Sep 
                                to begin in Sept., the Co. 
                                said on Apr. 28. 
 
 
WRB        Borger, TX    152.0  Gas Oil Hydrodesulfurization     Jun 
                                unit will be restart some        6-14 
                                time between June 6 and 14. 
                                It is unclear when then unit 
                                was taken out of service. 
                                Planned maintenance at Unit      Jul 12 
                                29 FCCU electrostatic precipi- 
                                tators starts May 31. Work 
                                will conclude on July 12. 
 
 
MID-WEST 
 
 
Frontier   El Dorado     130.0  A coker turnaround and expan-    Mid- 
           KS                   sion project was delayed until   Aug. 
                                Mid-July, and subsequently 
                                delayed until August. 
 
Valero     Memphis, TN   195.0  FCCU upgrade originally slated   2012 
                                for completion in 2009 has been 
                                shifted to 2012, the Co. said 
                                on Jan. 27. 
 
 
ROCKY MOUNTAINS 
 
Conoco     Billings,      61.0  On Mar. 5 the Co. delayed for    Jan. 
           MT                   one year an expansion project    2010